11-102948. r ASTER LAND USE APPLICATION
r.wd DEPARTMENT OF CoimmuNITY DEVELOPMENT SERVICES
33325 8`h Avenue South
CITY OF JUL 21 2011 Federal Way, WA 98003-6325
Federal Way ,^'�1r 253-835-2607; Fax 253-835-2609
Ci�Y �7F
FEDERAL Vv T www.cib,roffederalway.com
f- ICE
APPLICATION No(s)� % ~� Date 7-20-2011
Project Name Elder -Michaels Residence
Property Address/Location 11XX SW 295th St. Federal Wa WA. 98023
Parcel Number(s) 1196004690
Project Description Construct a new 3366sf 2-sto SFR wlattached 3 car mrage on a vacant 18.8228E .43 acre lot
PLEASE PRINT
Type of Permit Required
_ Annexation
_ Binding Site Plan
_ Boundary Line Adjustment
_ Comp Plan/Rezone
Land Surface Modification
~_ Lot Line Elimination
_ Preapplication Conference
_ Process I (Director's Approval)
Process II (Site Plan Review)
_ Process III (Project Approval)
Process IV (Hearing Examiner's Decision)
~_ Process V (Quasi -Judicial Rezone)
_ Process VI
x SEPA w/Project
SEPA Only
Shoreline: Variance/Conditional Use
Short Subdivision
_ Subdivision
Variance: Commercial/Residential
Required Information
RS 15.0. Zoning Designation
Sin le Family Medium Densi Comprehensive
Plan Designation
None Value of Existing Improvements
Mprox$450 00OValue of Proposed Improvements
2009 IBC International Building Code (IBC):
R-3 Occupancy Type
V-B Construction
Applicant
Name:
Bly R Elder 11
Address:
29410 157th Ave SE
City/State:
Kent WA
Zip:
98042
Phone:
253-740-0817 (Cell) 253-638-9797 (home)
Fax:
N/A
Email:
. 'm
Signature:
_reld�aC-paw
Agent (if different than Applicant)
Name: N/A
Address:
City/State:
Zip:
Phone:
Fax:
Email:
Signature:
Owner
Name:
Bly R Elder H
Address:
29410 157th Ave SE
City/State:
Kent WA
Zip:
98042
Phone:
253-740-0817 (Cell) 253-638-9797 (home)
Fax:
N/A
Email:
rel er
Signature: i
�-pDw�om
{�fj �
k:\Handouts\Master Land Use Application
Bulletin #003 —January 1, 2011 Page 1 of 1
BC)Pv
CITY OF
ti. Federal Way
July 29, 2011
Rick Elder
29410 157t` Avenue SE
Kent, WA 98042
CITY HALL
33325 8th Avenue South
Mailing Address: PO Box 9718
Federal Way, WA 98063-9718
(253) 835-7000
www.cityoffederalway.com
RE: File #11-102948-00-SE; ENVIRONMENTAL THRESHOLD DETERMINATION
Elder -Michaels, Parcel 119600-4690, Federal Way
Dear Mr. Elder:
City staff has reviewed the environmental checklist you submitted. We have determined that the proposal will
not have a probable significant adverse impact on the environment. As a result, an Environmental Impact
Statement (EIS) is not required to comply with the State Environmental Policy Act (SEPA).
A 14-day comment period is required by the SEPA rules (WAC 197-11-340)_ A notice inviting comments will
be published in the Federal Way Mirror on July 30, 2011. At the end of the comment period, the department
will decide whether the Determination of Nonsignificance (DNS) should be withdrawn, modified, or issued as
proposed. All final determinations may be appealed within 14 days following the comment deadline. No
licenses, permits, or approvals will be issued until completion of the appeal period.
The decision not to require an EIS does not grant the license, permit, or approval you are seeking from the city.
The environmental record is considered by the decision maker(s) and conditions will be imposed to reduce
identified environmental impacts, as long as the conditions are based on adopted and designated city policy.
After a final decision has been made on your proposal (i.e., after a permit has been issued), you may, but are not
required to, publish a Notice of Action as set forth in RCW 43.21C.075. The Notice of Action sets forth a time
period after which no legal challenges regarding the proposal's compliance with SEPA can be made. The city is
not responsible for publishing the Notice of Action. However, the city is responsible for giving a notice to
parties of record stating the date for any judicial appeal (including the SEPA portion of that appeal) if your
proposal is one for which the city's action contains a specified time period within any court appeals must be
made.
Questions regarding the building permit's environmental review component should be directed to me at 253-
835-2638 or matt.herrera@cityoffederalway.com.
Sincerely,
Matthew rrera _
Associate Planner
enc: DNS
Doc I D. 58428
Matt Herrera
From:
Isaac Conlen
Sent:
Friday, May 13, 2011 8:36 AM
To:
Matt Herrera
Subject:
Townsend Drainage Request
Hi Matt,
I'm following up on the discussion we had about the Townsend drainage issue. He's trying to get this resolved. I think
we should document our decision (I'm not sure if by AD or some other type of note to file - I can figure that out later).
The purpose of this email is just to evaluate the relevant code provisions.
The request is to build a drainage facility on vacant lot, the purpose of which is to serve a new house constructed on a
separate lot. Both lots are under the same ownership. The lots are not contiguos with each other, as I understand it,
but they are separated by a third lot, also under the same ownership.
My interpretation of code is that this action would be permitted. The drainage facility is considered accessory to the
principal single-family use, as such facilities are commonly associated with residential uses. While the drainage facility is
not on the same lot as the house, it is part of the same "subject property". Subject property is defined as: means the
entire lot or parcel, or series of lots or parcels, on which a development, activity, or use exists or will occur....". The
townsend group of lots meets the definition of subject property. Therefore, the drainage facility is permitted as an
accessory use, to the primary single family housing use on the subject property.
Let's discuss when you return.
Isaac Conlen
Planning Manager
253 835 2643
CITY OF�
Federal Way
ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE
ELDER/MICHAELS SINGLE-FAMILY RESIDENCE
Federal Way File No: 11-102948-00-SE
Proposal: Construction of a new single-family residence on an existing unimproved single-family
residential lot. Site improvements are on and within 25 feet of a geologically hazardous area,
specifically a steep slope hazard area as defined by Federal Way Revised Code. Associated
improvements include stormwater mitigation, water/sewer extensions, driveway paving,
retaining walls, and landscaping.
Applicant: Bly R. Elder, 29410 157`h Avenue SE, Kent, WA 98042
Location: King County Assessor Tax Parcel 119600-4690. The lot is a vacant parcel located at the 1100
block of SW 295h Street.
Lead Agency: City of Federal Way Community and Economic Development Department
Staff Contact: Matthew Herrera, Associate Planner, 253-835-2638
The Responsible Official of the City of Federal Way hereby makes the following threshold determination based
upon impacts identified in the Environmental Checklist, Federal Way Comprehensive Plan; and other policies,
plans, rules, and regulations designated as a basis for exercise of substantive authority under the State
Environmental Policy Act Rules pursuant to RCW 43.21 C.060.
The lead agency for this proposal has determined that the proposed action does not have probable significant
adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW
43.21C.032(2)(c). This decision was made after review of a completed environmental checklist, technical
information reports (geotechnical and stormwater), the city's Critical Areas Ordinance, and other information on
file with the lead agency. This information is available to the public on request.
This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act
on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on
August 15, 2011.
Unless modified by the city, this determination will become final following the above comment deadline. Any
person aggrieved of the city's final determination may file an appeal with the city within 14 days of the above
comment deadline. You may appeal this determination to the Federal Way City Clerk at the City of Federal Way
(33325 8'h Avenue South, 98003) no later than 5:00 p.m. on August 29, 2011, by a written letter, accompanied
with the associated fee, stating the reason for the appeal of the determination. You should be prepared to make
specific factual objections.
Responsible Official: Isaac Conlen, Planning Manager, for Patrick Doherty
Position/Title: Community and Economic Development Director
Address: 33325 8'h Avenue South, Federal Way, 98003
Date Issued: July 30. 2011 Signature:
Doc. I D 58424
U)
o -a
O O O U i
>rj) N C
cuQ O +' N N CD N
E E a) — C U- � >, �
47 •C N E O 0)� t O O
O>. V N �, C ca o O O
W 0 0)>Co > y� ._..� N � 0 C
in C C Q- 0 0 m� fcn
Y/ , � ++ E O CL � C � "a Y
.X N p (6 � : a) ca
❑ N C U) � N O) > (a
�—� CCc
O O N U ` C U
Ems—--ca
U 0) ca I C 3 C NLO co 0 cm a� U
0 C.) C N Q U La)
N
+'NNC c > o �CD4-+_'
0
p to W 4— N p .- N 0+ o
U���c`o )d) zccu cc
N
U
N
� N
m
-- CL
� � U
L.L N N
1 co �^
N � 7
CU
L
� C .
N '
ROBINSON`
NOBLE
July 27, 2011
Mr. Rick Elder
2940 —157t' Avenue Northeast
Kent, Washington 98042
Plan Review Letter
Elder Residence
Federal Way, Washington 98003
File No. 2602-001A
Dear Mr. Elder:
This letter presents our review of geotechnical aspects of project plans for your planned
residence on 12" Avenue Southwest in Federal Way, Washington. The site is designated as
King County Parcel 119004690. We have previously prepared a geotechnical report for the
property dated June 25, 2010, and a Revised City Comments Response Letter, dated March
15, 2011. We have been provided with copies of plan sheets C-0 through C-3, dated June 29,
2010, prepared by GeoResources, LLC, for the site that show the layout of the planned
structure and access drive within the lot, and planned and existing site topography. You have
requested that we review the plans to verify that they are in conformance with our
geotechnical recommendations.
The site has been designated as a geologic hazardous area due to steep slopes within the
property. Slopes in excess of 40 percent have been identified on the south side of the property.
Since completing our geotechnical report, you have informed us that the house site has moved
north 18 feet, and the house elevation has been lowered 2.5 feet to lessen impacts to the
steep slope.
It is our opinion the house can be constructed in the location shown on the plans from a
geotechnical perspective. The recommendations in our geotechnical report should be followed;
specifically the foundations should extend down into bearing soils.
Within the limitations of scope, schedule and budget for our services, we have strived to take
care that our services have been completed in accordance with generally accepted practices
followed in this area at the time this letter was prepared. No other conditions, expressed or
implied, should be understood.
17625 —130th Avenue Northeast, Suite 102 • Woodinville Washington 98072 - Phone: 425-488-0599 ■ Fax: 425-488-2330
www.robinson-noble.com
Plan Review Letter
Elder Residence
Federal Way, Washington
File No. 2602-001 A
July 27, 2011
Page 2
We appreciate the opportunity to be of service to you. If there are any questions concerning
this letter or if we can provide additional services, please call.
Sincerely,
Robinson Noble, Inc.
b
-712`112-011
305M
ty �9
Rick B. Powell, PE
Principal Engineer
-u
Three Copies Submitted
Robinson Noble, Inc.
CITY OF
Federal
January 14, 2011
Mr. Rick Elder
29410 157`h Avenue SE
Kent, WA 98042
CITY HALL
33325 8th Avenue South
.1 ---. I I - WY Federal Way, WA 980b3qW"
(253) 835-7000
www.cityoffederalway.com
RE: FILE #10-105323-00-SF; ADDITIONAL INFORMATION NEEDED
Elder-NUchaels, King County Parcel 11900-4690, Federal Way
Dear Mr. Elder:
The Community and Economic Development Department's Planning Division has completed review of
your building permit submittal. The following items are required prior to the division's approval of the
permit.
1. Environmental Checklist — The department has determined the improvements are proposed in or
within 25 feet of a geologically hazardous area, specifically a steep slope hazard area. Therefore,
the single-family building permit is no longer exempt from review under the State Environmental
Policy Act (SEPA) pursuant to Federal Way Revised Code (FWRC) 14.30.030(1). Please submit a
completed environmental checklist. stamped ra tilina envelopes for oronerty owners within 300
feet of the proeM, and associated checklist fee. Following review of the checklist, the
department will issue a determination at which time a 14-day public comment period will begin.
The building permit will not be issued until SEPA procedural timelines are completed.
2. Steep Slope Intrusion Request —The city's Critical Areas Ordinance requires applicants proposing
improvements within geologically hazardous areas to request an administrative decision from the
Director of Community and Economic Development. Pursuant to FWRC 19.160.010(2),
development activities are permitted on or within 25 feet of a geologically hazardous area if: (1)
no reasonable alternative exists; and (2) the development activity will not lead to or create any
increased slide, seismic, or erosion hazard. Please submit a written narrative with Your
resubmittal detailing how the two criteria will be met.
3. Driveway Location — The proposed driveway is approximately four feet from the side property
line within the 20-foot required yard area. FWRC 19.130.240(1)(a) does not allow driveways
located in required front yards to be closer than 5 feet to any side property line. Please make the
correction on the site plan and resubmit.
The following items are required to be completed prior to Certificate of Occupancy and will be included
as conditions of permit approval.
1. Lot Line Elimination —Setbacks (required yards), pursuant to FWRC 19.200.010, are not
currently met due to the underlying Buenna Addition lot lines 16-20. These internal lot lines must
be removed prior to Certificate of Occupancy. Please fmd the enclosed handouts regarding the lot
line elimination process.
..ay �
Mr. Elder
January I4, 2011
Page 2
2. Tree Planting — The insufficient tree cover on the subject property is required to be supplemented
to comply with city tree regulations set forth in FWRC 19.120.130(1)(c) and (3). Prior to
Certificate of Occupancy, the applicant will be required to provide 10 tree units on the subject
property per the table below. Please find the enclosed tree handouts for recommended species and
their corresponding credit.
Replacement Tree, Small Canopy Species .50 tree units per tree planted
(Mature canopy area < 450 SF)
Replacement Tree, Medium Canopy Species 1.0 tree units per tree planted
(Mature canopy area 450 to 1,250 SF)
Replacement Tree, Large Canopy Species 1.5 tree units per tree planted `
(Mature canopy area > 1,250 SF) f
For SEPA and Lot Line Elimination fee information, please contact the Permit Center at 253-835-2607.
Other questions may be directed to me at 253-835-2638 or matt.herrera@cityoffederalway.com.
0,0001
ri��Y�'
Matthew Herrera
Associate Planner
enc: Bulletin 002 "Mailing Labels"
Bulletin 003 "Master Land Use Application'
Bulletin 000 "Lot Line Elimination'
Bulletin 050 "Environmental Checklist'
Bulletin 065 "SEPA Submittal Requirements"
Bulletin 068 "Recommended Tree Species"
Bulletin 129 "Resubmittal Information'
c: Scott Sproul, Plans Examiner
Kevin Peterson, Engineering Plans Reviewer
10-105323
Doc I.D. 56708
Isaac Conlen
From: Peter Townsend CPA [petert8@me.com]
Sent: Thursday, May 12, 2011 1:54 PM
To: William Appleton; Isaac Conlen
Subject: Lot B -Elder bidg permit -surface water
Hello Bill and Isaac,
Thanks for the short meeting before lunch and for getting together after lunch.
From the meeting last Friday, I think that the issues to be discussed are:
1. To enable Rick Elder to build now, can the Elder Lot/Lot B (119600-4690) have a separate
tight line and direct discharge/dispersion on to the east swale on either Lot 119600-2465 or
Lot 119600-2544.
A surface water easement would need to be given by Townsend. This easement would need
to be submitted as part of the Elder building application.
This easement could later be revised and folded into a master drainage easement for
Sanchez/Townsend to be submitted later.
2. Can the repair of the west surface water route, on Sanchez (lot 062104-9071) and Townsend
lot (119600-2465), be made without a permit?
This route has been there for at least 50 years and is functioning now.
This would require (a) a probable 12" tight line from the present culvert outfall,
across the Townsend and Sanchez lots to the present Sanchez lot catch basin.
(b) repair or replace present Sanchez lot catch basin, and
(c) repair or replace 2 @ +/- 6" plastic flexible pipes going
from the Sanchez catch basin over the rest of the sanchez lawn and then down the gully for
approximately 100' to just above the Puget Sound high water mark.
3. Can the same work as described in Paragraph 2 above be done without a permit, the only
difference being that the surface water and catch basin and 2 @ 6" pipes would be kept on the
Townsend lot, just east of the Sanchez lot?
Thanks,
Peter
1
}
CITY OF
Federal Way
DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES
33325 8`h Avenue South
Federal Way, WA 98003-6325
253-835-2607;Fax 253-835-2609
www.citypffed galwa .com
ENVIRONMENTAL CHECKLIST
PURPOSE OF CHECKLIST
The State Environmental Policy Act (SEPA), Revised Code of Washington (RCV) Chapter 43.21 C,
requires all governmental agencies to consider the environmental impacts of a proposal before making
decisions. An environmental impact statement (EIS) must be prepared for all proposals with probable
significant adverse impacts on the quality of the environment. The purpose of this checklist is to provide
information to help you and the agency identify impacts from your proposal (and to reduce or avoid
impacts from the proposal, if it can be done) and to help the agency decide whether an EIS is required.
INSTRUCTIONS FOR APPLICANTS
This environmental checklist asks you to describe some basic information about our proposal.
Governmental agencies use this checklist to determine whether the environmental impacts of your proposal
are significant, requiring preparation of an EIS. Answer the questions briefly, with the most precise
information known, or give the best description you can.
You must answer each question accurately and carefully, to the best of your knowledge. In most cases, you
should be able to answer the questions from your own observations or project plans without the need to
hire experts. If you do not know the answer, or if a question does not apply to your proposal, write "do not
know" or "does not apply." Complete answers to questions now may avoid unnecessary delays later.
Some questions ask about governmental regulations, such as zoning, shoreline, and landmark designations.
Answer these questions if you can. If you have problems, the governmental agencies can assist you.
The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of
time or on different parcels of land. Attach any additional information that will help describe your proposal
or its environmental effects. The agency to which you submit this checklist may ask you to explain your
answers or provide additional information reasonably related to determining if there may be significant
adverse impact.
USE OF CHECKLIST FOR NON -PROJECT PROPOSALS
Complete this checklist for non -project proposals, even though questions may be answered "does not
apply." In addition, complete the Supplemental Sheet for Non -Project Actions.
For non -project actions, the references in the checklist to the words "project," "applicant," and "property
or site" should be read as "proposal," "proposer," and "affected geographic area," respectively.
RECEIVE®
JUL 21 2011
Bulletin #050 — January 1, 2011 Page I of 18 k:\Harid' Owt--= ►�i� li 1
CDS
A. BACKGROUND
1. Name of proposed project, if applicable:
Elder -Michaels Residence
2. Name of applicant:
Rick Elder & Diane Michaels
3. Address and phone number of applicant and contact person:
Contact: Rick Elder, 29410-1571h AVE SE; Kent, WA 98042; 253-740-0817
4. Date checklist prepared:
7/5/11
5. Agency requesting checklist:
City of Federal Way - Department of Community Development Services
6. Proposed timing or schedule (including phasing, if applicable):
SEPA checklist & building permit approval: 7/2011— 8/2011
Construct proposed residence on vacant lot: 9/2011— 5/2012
7. Do you have any plans for future additions, expansion, or further activity related to or connected with
this proposal? If yes, explain.
No.
8. List any environmental information you know about that has been prepared, or will be prepared,
directly related to this proposal.
Geotechnical Report by Cornerstone Geotechnical, Inc; 17625-1301h AVE NE / #C102; Woodinville,
WA 98072; PH: 425-844-1977; CG file number 2387; dated 9/25/07
9. Do you know whether applications are pending for governmental approvals of other proposals directly
affecting the property covered by your proposal? If yes, explain.
No.
Bulletin #050 —January 1, 2011 Page 2 of 18 kMandouts\Environmental Checklist
10. List any government approvals or permits that will be needed for your proposal, if known.
SEPA approval and building permit approval.
11. Give brief, complete description of your proposal, including the proposed uses and the size of the
project and site. There are several questions later in this checklist that ask you to describe certain
aspects of your proposal. You do not need to repeat those answers on this page.
Construct a new 3366sf 2-story SFR w/attached 3-car garage on a vacant,18,822sf (0.43 acre) lot.
12. Location of the proposal. Give sufficient information for a person to understand the precise location of
your proposed project, including a street address, if any, and section, township, and range, if known.
If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide
a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you
should submit any plans required by the agency, you are not required to duplicate maps or detailed
plans submitted with any permit applications related to this checklist.
Proposal is located on assessor's parcel number 1196004690.
Estimated street address 11XX SW 295th ST, Federal Way, WA 98023.
Section 6 Township 21 Range 4E; King County, WA.
B. ENVIRONMENTAL ELEMENTS
1. EARTH
a. General description of the site (circle one): flat, rolling, hilly, steep slopes, mountainous, other.
Steep slope at S 1/ of the site, low slope at middle 1/, low -to -moderate slope at N 1/ of the site.
b. What is the steepest slope on the site (approximate percent slope)?
Approximately 53% (20' rise in 38' run) between contours 180 & 200 at the midpoint of the south
property line.
c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, mulch)? If
you know the classification of agricultural soils, specify them and note any prime farmland.
Site soils are primarily medium dense, silty sands overlain by five feet of looser silty sand fill at the
low slope area at the middle 1/ of the site. It is likely that the low -slope area at the middle 1/ of the
site is a man-made "bench" created by excavating material from the south, artificially steepening
the south 1/ of the site so that it is now over 40% slope.
Bulletin #050 — January 1, 2011 Page 3 of 18 k:\Handouts\Environmental Checklist
No.
d. Are there surface indications or history of unsable soils in the immediate vicinity? If so, describe.
e. Describe the purpose, type, and approximate quantities of any filling or grading proposed.
Indicate source of fill.
300cy of fill is proposed at the west side of the proposed garage and in the auto court area on the
east side of the garage. A 100cy cut is proposed to create four (4) guest parking stalls at the
easement on the north 1/ of the site. A 200cy cut of 7' max depth is proposed at the base of the steep
slope critical area, with installation of a 4' max ht stack block retaining wall, and the hillside above
the retaining wall graded at a 2HAV slope (50%). Cut material will be reused onsite as fill, cut and
fill will balance.
f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe.
Yes, erosion could occur as a result of clearing, construction, or use; absent comprehensive erosion
control measures.
g. About what percent of the site will be covered with impervious surfaces after project construction
(for example, asphalt or buildings)?
47%
h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any.
The proposal will utilize comprehensive erosion control measures (BMWs) to control erosion impacts
during clearing, construction, and use, including silt fencing, hay bale barriers, stockpile covering,
catch basin protection, application of plastic sheeting, hydro -seeding and mulching, replanting of
the hillside, and the installation of a permanent storm drainage control system.
2. AIR
a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors,
industrial wood smoke) during construction and when the project is completed? If any, generally
describe and give approximate quantities if known.
The proposal will result in minor amounts of dust, automobile and construction equipment
emissions during construction, with minor amounts of automobile and natural gas combustion
emissions when completed and occupied.
b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally
describe.
No.
Bulletin #050 — January 1, 2011 Page 4 of 18 k:\Handouts\Environmental Checklist
c. Proposed measures to reduce or control emissions or other impacts to air, if any.
The proposal will comply with PSAPCA standards to reduce and control dust, vehicle and
equipment emissions.
3. WATER
a. Surface.
1) Is there any surface water body on or in the immediate vicinity of the site (including year-
round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and
provide names. If appropriate, state what stream or river it flows into.
Puget Sound is located approximately 450' to the north of the site.
2) Will the project require any work over, in, or adjacent to (within 200 feet) the described
waters? If yes, please describe and attach available plans.
No.
3) Estimate the amount of fill and dredge material that would be placed in or removed from
surface water or wetlands and indicate the area of the site that would be affected. Indicate the
source of fill material.
None.
4) Will the proposal require surface water withdrawals or diversions? Give general description,
purpose, and approximate quantities if known.
No.
5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan.
No.
6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe
the type of waste and anticipated volume of discharge.
No.
Bulletin #050 — January 1, 2011 Page 5 of 18 k:\Handouts\Environmental Checklist
b. Ground.
1) Will ground water be withdrawn, or will water be discharged to groundwater? Give general
description, purpose, and approximate quantities if known.
Offsite infiltration of stormwater may be utilized, but most likely, stormwater will be collected,
treated, retained, and discharged directly to Puget Sound via a multi -lot stormwater system
currently under design and engineering analysis.
2) Describe waste material that will be discharged into the ground from septic tanks or other
sources, if any (for example: domestic sewage; industrial, containing the following
chemicals...; agricultural; etc.). Describe the general size of the system, the number of such
systems, the number of houses to be served (if applicable), or the number of animals or
humans the system(s) are expected to serve.
None.
c. Water Runoff (including stormwater)
1) Describe the source of runoff (including stormwater) and method of collection and disposal,
if any (include quantities, if known). Where will this water flow? Will this water flow into
other waters? If so, describe.
Offsite infiltration of stormwater may be utilized, but most likely, stormwater will be collected,
treated, retained, and discharged directly to Puget Sound via a multi -lot stormwater system
currently under design and engineering analysis, using a surface -anchored pipe following a ravine
located east and north of the site, with its outfall at Puget Sound.
2) Could waste materials enter ground or surface waters? If so, generally describe.
Yes, automobile oils, dirt, and fertilizers/phosphates may enter surface waters.
d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any.
Stormwater will be collected, retained and treated prior to infiltration or discharge into Puget
Sound, per the requirements of the current edition of the applicable Surface Water Design Manual.
Bulletin #050 — January 1, 2011 Page 6 of 18 k:\Handouts\Environmental Checklist
4. PLANTS
a. Check or circle types of vegetation found on the site.
_ deciduous tree: alder, maple, aspen, other
evergreen tree: fir, cedar, pine, other
shrubs
_x_ grass
pasture
crop or grain
wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other
water plant: water lily, eelgrass, milfoil, other
other types of vegetation
b. What kind and amount of vegetation will be removed or altered?
Onsite grass groundcover will be removed.
c. List threatened or endangered species known to be on or near the site.
None
d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation
on the site, if any.
The site will be fully replanted, using native & drought -resistant plants to cut irrigation water use.
5. ANIMALS
a. Circle any birds and animals which have been observed on or near the site or are known to be on
or near the site.
birds: hawk, heron, eagle, songbirds, other (songbirds)
mammals: deer, bear, elk, beaver, other (raccoons, moles)
fish: bass, salmon, trout, herring, shellfish, other (none)
b. List any threatened or endangered species known to be on or near the site.
None.
c. Is the site part of a migration route? If so, explain.
No.
Bulletin #050 — January 1, 2011 Page 7 of 18 k:\Handouts\Environmental Checklist
d. Proposed measures to preserve or enhance wildlife, if any.
None.
6. ENERGY AND NATURAL RESOURCES
a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the
completed project's energy needs? Describe whether it will be used for heating, manufacturing,
etc.
Natural Gas will be used for space heating. Electricity will be used for lighting and power, and to
drive the A/C compressor. Natural gas will be used for cooldng and water heating.
No.
b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally
describe.
c. What kinds of energy conservation features are included in the plans of this proposal? List other
proposed measures to reduce or control energy impacts, if any.
Proposal will comply with 2006 WSEC. Proposal will use high -efficiency furnace, water heater, and
appliances.
7. ENVIRONMENTAL HEALTH
a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and
explosion, spill, or hazardous waste that could occur as a result of this proposal? If so, describe.
No.
1) Describe special emergency services that might be required.
None.
Bulletin #050 — January 1, 2011 Page 8 of 18 k:\Handouts\Environmental Checklist
2) Proposed measures to reduce or control environmental health hazards, if any.
None.
b. Noise.
1) What types of noise exist in the area which may affect your project (for example: traffic,
equipment operation, other)?
None.
2) What types and levels of noise would be created by or associated with the project on a
short-term or long-term basis (for example: traffic, construction operation, other)? Indicate
what hours noise would come from the site.
Short term: Construction noise, low to moderate volume.
Long term: human occupancy, machine and auto operation, A/C compressor, low volume.
3) Proposed measures to reduce or control noise impacts, if any.
Construction activities, vehicles and machinery shall comply with applicable noise ordinances and
allowable times of operation.
8. LAND AND SHORELINE USE
a. What is the current use of the site and adjacent properties?
Site: Vacant. Adjacent lots to N & E: Vacant. Future SFR. Adjacent lots to S & W: Existing SFR.
b. Has the site been used for agriculture? If so, describe.
No.
Bulletin #050 — January 1, 2011 Page 9 of 18 k:\Handouts\Environmental Checklist
c. Describe any structures on the site.
There are no existing structures on site.
No.
d. Will any structures be demolished? If so, what?
e. What is the current zoning classification of the site?
RS 15.0.
f. What is the current comprehensive plan designation of the site?
Single Family Medium Density.
N/A.
g. If applicable, what is the current shoreline master program designation of the site?
h. Has any part of the site been classified as an environmentally critical area? If so, specify.
Yes, the S 1/ of the site has been designated as a steep slope critical area with slope > 40%.
i. Approximately how many people would reside or work in the completed project?
Two.
j. Approximately how many people would the completed project displace?
Zero.
Bulletin #050 — January 1, 2011 Page 10 of 18 k:\Handouts\Environmental Checklist
k. Proposed measures to avoid or reduce displacement impacts, if any.
None.
1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and
plans, if any.
Proposal complies with the applicable Comprehensive Plan and Zoning Code.
9. HOUSING
a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-
income housing.
One, high -income.
b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or
low-income housing.
Zero.
c. Proposed measures to reduce or control housing impacts, if any.
None.
10. AESTHETICS
a. What is the tallest height of any proposed structure(s), not including antennas; what is the
principal exterior building material(s) proposed?
The highest roof of the proposed structure is approximately 24.5' above existing grade. The
principal exterior materials are composition roofing, horizontal Hardi-plank siding, smooth texture
Hardi-panel siding, vinyl -frame windows, and faux stone veneer.
Bulletin #050 — January 1, 2011 Page 11 of 18 k:\Handouts\Environmental Checklist
b. What views in the immediate vicinity would be altered or obstructed?
The new residence will create a small obstruction to a portion of the westerly water views of the
property owner two lots east.
c. Proposed measures to reduce or control aesthetic impacts, if any.
Building height and location have been restricted and approved via negotiations with the lot seller,
who occupies the residence two lots to the east. The building has undergone private design review by
the lot seller's architect.
11. LIGHT AND GLARE
a. What type of light or glare will the proposal produce? What time of day would it mainly occur?
The proposal will generate interior night lighting during evening hours.
P01
b. Could light or glare from the finished project be a safety hazard or interfere with views?
c. What existing off -site sources of light or glare may affect your proposal?
None.
d. Proposed measures to reduce or control light and glare impacts, if any.
None.
Bulletin #050 — January 1, 2011 Page 12 of 18 k:\Handouts\Environmental Checklist
12. RECREATION
a. What designated and informal recreational opportunities are in the immediate vicinity?
None.
IM
b. Would the proposed displace any existing recreational uses? If so, describe.
c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities
to be provided by the project or applicant, if any.
None.
13. HISTORIC AND CULTURAL PRESERVATION
No.
a. Are there any places or objects listed on, or proposed for, nation, state, or local preservation
registers known to be on or next to the site? If so, generally describe.
b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural
importance known to be on or next to the site.
N/A.
c. Proposed measures to reduce or control impacts, if any.
None.
Bulletin #050 — January 1, 2011 Page 13 of 18 k:\Handouts\Environmental Checklist
14. TRANSPORTATION
a. Identify public streets and highways serving the site, and describe proposed access to the existing
street system. Show on site plans, if any.
The proposed residence will access the public street system via a private driveway from a private
access easement shared by multiple lots, which extends from the end of 12th AVE SW, a public
ROW. 12th AVE SW connects to SW Marine View DR.
b. Is the site currently served by public transit? If not, what is the approximate distance to the
nearest transit stop?
No. The nearest transit stop is for Metro Route 901/903, on SW Dash Point RD @ 12th AVE SW;
approximately 1 mile south.
c. How many parking spaces would the completed project have? How many would the project
eliminate?
The proposal will have 11 parking spaces, (3) owner @ garage, (4) private guest spaces @ auto
court, (4) common guest spaces @ private easement. Zero spaces will be eliminated.
d. Will the proposal require any new roads or streets, or improvements to existing roads or streets,
not including driveways? If so, generally describe (indicate whether public or private).
The proposal requires private realignment and expansion of the private easement.
lily
e. Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so,
generally describe.
f. How many vehicular trips per day would be generated by the completed project? If known,
indicate when peak volumes would occur.
The proposal will generate approximately 7 vehicle trips per day, with peak volumes at morning
and evening weekday commute hours.
g. Proposed measures to reduce or control transportation impacts, if any.
None.
Bulletin #050 — January 1, 2011 Page 14 of 18 kAHandouts\Environmental Checklist
15. PUBLIC SERVICES
a. Would the project result in an increased need for public services (for example: fire protection,
police protection, health care, schools, other)? If so, generally describe.
Yes, the proposal will require fire protection services, police protection services, and health care
services. The owners are empty nesters and will not require school services, but future occupants
may require these services.
b. Proposed measures to reduce or control direct impacts on public services, if any.
Provide residential sprinkler system, pay sales tax for construction and property taxes on new
residence.
16. UTILITIES
a. Circle utilities currently available at the site:
electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other
(please list)
Electricity, natural gas, water, refuse service, telephone, sanitary sewer, cable TV.
b. Describe the utilities that are proposed for the project, the utility providing the service, and the
general construction activities on the site or in the immediate vicinity which might be needed.
Electricity: Puget Sound Energy (PSE), connect to electric service at easement.
Natural gas: Puget Sound Energy (PSE), connect to gas main at easement.
Water: Lakehaven Utility District, connect to water main at easement.
Sanitary Sewer: Lakehaven Utility District, connect to sewer main at easement.
Refuse service: Waste Management, no construction required.
Telephone: Qwest, connect to telephone service at easement.
Cable TV/Internet: Comcast, connect to cable TV/internet service at easement.
Bulletin #050 — January 1, 2011 Page 15 of 18 k:\Handouts\Environmental Checklist
C. SIGNATURE
The above answers are true and complete to the best of my knowledge. I understand that the lead agency is
relying on them to make its decision.
SIGNATURE:
DATE SUBMI
Note: Checklist prepared by Jeffrey deRoulet, Project Architect for Elder -Michaels Residence; 7/6/11.
Bulletin #050 — January 1, 2011 Page 16 of 18 k:\Handouts\Environmental Checklist
D. SUPPLEMENTAL SHEET FOR NON -PROJECT ACTIONS
Because these questions are very general, it may be helpful to read them in conjunction with the list of the
elements of the environment.
When answering these questions, be aware of the proposal, of the types of activities likely to result from
the proposal, and if they are likely to affect the item at a greater intensity or at a faster rate than if the
proposal were not implemented. Respond briefly and in general terms.
1. How would the proposal be likely to increase discharge to water; emissions to air; production, storage,
or release of toxic or hazardous substances; or production of noise?
Proposal is likely to increase storm water discharge to groundwater & Puget Sound, increase
emission of dust and products of combustion to the air, and increase production of noise.
Proposed measures to avoid or reduce such increases:
Proposal shall comply with applicable stormwater, BMW, air quality, and noise codes and
ordinances to reduce increases of substances listed above.
2. How would the proposal be likely to affect plants, animals, fish, or marine life?
Not likely
Proposed measures to protect or conserve plants, animals, fish, or marine life:
None
3. How would the proposal be likely to deplete energy or natural resources?
The proposal will result in construction of a new residence, and will increase use of energy and
natural resources.
Proposed measures to protect or conserve energy and natural resources:
Proposal will comply with 2006 WSEC to conserve energy and 2009 IRC w/WA amendments to
conserve water.
Bulletin #050 — January 1, 2011 Page 17 of 18 k:\Handouts\Environmental Checklist
4. How would the proposal be likely to use or affect environmentally critical areas or areas designated (or
eligible or under study) for governmental protection; such as parks, wilderness, wild and scenic rivers,
threatened or endangered species habitat, historic or cultural sites, wetlands, floodplains, or prime
farmlands?
Proposal will be constructed adjacent to existing minor steep slope critical area.
Proposed measures to protect such resources or to avoid or reduce impacts:
Proposal will follow recommendations of Geotechnical Report to minimize impact on steep slope.
5. How would the proposal be likely to affect land and shoreline use, including whether it would allow
or encourage land or shoreline uses incompatible with existing plans.
Not likely
Proposed measures to avoid or reduce shoreline and land use impacts:
None
6. How would the proposal be likely to increase demands on transportation or public service and
utilities?
Proposal is likely to increase demands on local roadways, on local public services and utilities.
Proposed measures to reduce or respond to such demands:
Proposal will utilize residential fire sprinkler system.
7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or
requirements for the protection of the environment.
The proposal will comply with all local, state and federal laws and requirements for protection of
the environment.
Bulletin #050 — January 1, 2011 Page 18 of 18 k:\Handouts\Environmental Checklist
1 1,
NOTICES
C FW OF rE5iE AL WAY
NOTICE
ENVIRONMENTAL DETERMINATION OF
NONSIGNIFICANCE
ELDER/MICHAELS SINGLE-FAMILY RESIDENCE
Federal Way File No:11-102946-00-SE
Proposal:Construction of a new single-family
residence on an existing unimproved single-family
residential lot. Site improvements are on and with-
in 25-feet of a geologically hazardous area, specifi-
cally a steep slope hazard area as defined by Fed-
eral Way Revised Code. Associated improvements
include stormwater mitigation, water/sewer exten-
sions, driveway paving, retaining walls, and land-
scaping.
Applicant: Bly R Elder, 29410 157th Avenue SE,
Kent, WA 98042
Location:King County Assessor Tax Parcel
119600-4690. The lot is a vacant parcel located at
the 1100 block of SW 295th Street.
Lead Agency: City of Federal Way Community and
Economic Development Department
Staff Contact: Associate Planner Matthew Herrera,
253.835-2638
The Responsible Official of the City of Federal Way
hereby makes the following threshold determina-
tion based upon impacts identified in the Environ-
mental Checklist; Federal Way Comprehensive
Plan, and other policies, plans, rules, and regula-
tions� designated as a basis for exercise of substan-
tive authority under the Slate Environmental Policy
Act Rules pursuant to RCW 43.21 C.060.
The lead agency for this proposal has determined
that the proposed action does not have probable
significant adverse impact on the environment and
an Environmental Impact Statement (EIS) is, not re-
quired under ROW 43.21C.032(2)(c). This decision
was made after review of a completed environmen-
tal checklist, technical information reports (geo-
technical and stormwater), the. city's Critical Areas
Ordinance, and other information on file with the
lead agency. This information is avallable to the
public on request.
This DNS is issued under Washington Administra-
tive Code (WAC) 197-11.340(2); the lead agency
will not act on this proposal for 14 days from the
date of issuance. Comments must be submitted no
later than 5:00 p.m. onAugust 15, 2011.
Unless modified by the city, this determination will
become final following the above comment dead-
line. Any person aggrieved of the city's figal deter-
mination may file an appeal with the city within. 14
days of the above comment deadline. You may ap-
peal this determination to the Federal Way City
Clerk at the City of Federal Way (33325 8th Ave-
nue South, Federal Way, WA 98003) no later than
5:00 p.m. on August 29, 2011, by a written letter
accompanied with the associated tee, stating the
reason for the appeal of the determination. You
should be prepared to make spacific factual objec-
tions.
FWM1795
Date published: July 30, 2011
s
V % -h
31919 P Ave S, Suite 1011 Federal, Way, WA98003 1 253.925.5565 1 253.925.5750 (f)
Affidavit of Publication
Rudi Alcott, being first duly sworn on oath, deposes and says that he is the Publisher
of The Federal Way Mirror, a semi -weekly newspaper. That said newspaper is
published in the English language continually as a semi -weekly newspaper in Federal
Way, King County, Washington, and is now and during all of said time has been printed
in an office maintained by the aforementioned place of publication of said newspaper.
That the annexed is a true copy of a legal advertisement placed by
City of Federal Way —Community and Economic Development
as it was published in regular issues (and not in supplemental form) of said newspaper
once each week for a period of one, consecutive weeks(s), commencing on the 30th
day of July 2011 , and ending on the 30th day of July 2011 , both dates inclusive,
and that such newspaper was regularly distributed to its readers during all of said
period.
That the full amount of the fee charged for the foregoing publication is the sum of
$109.59, which amount has been paid in full, or billed at the legal rate according to
RCW 65.16.090.
Subscribed to and sworn before me this 5th_day of August 2011.
Notary Public in and for the State of Washington,
Residing at Federal Way
Ync-', Lv�_"Ia_�'_ � �
n
y-
pp
t
45
rF
i?:::---i• E"Ep, n•FE '.:
xu _
Y
•Y ..
�;-e�
x y •'S gip':
_ ..t..
;.
wo
r
..A V i5-} - rY ::
z
: (
'
" ..
�k�.:�:a;:
:fie f-:iE j +. r, •�'
.�,:� .s�r-lid- r.. f':. :ti'! .: •'P:'
r'
..
t
. .
} i.I
y
, t�
t.
r
=,
r7ir
=-
.. .. .:..'..........:'
ig
.. .tEi •EE!!EEEE3t3iiiiu f:i::::Euri:. :iS.: •. ;[1"
• •-
Jr'
�w..ra7
!:::: .p'.Y2;�i?i�:. • L 3 ^
......... -
.
r
f i}
RED
xv
_ a
� �� jai; "•�'. � . _
.�•.�
... - -
- _.-.;:. ..'. -' .� .. :,wit ..i;::.--• _ _ —•. {,.. �-... "�
-
41k
Federal OF
Way
DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES
33325 8th Avenue South
PO Box 9718
Federal Way WA 98063-9718
253-835-7000; Fax 253-835-2609
www.cifyoffederalway.com
DECLARATION OF DISTRIBUTION
I, Alexa Heidrich
laws of the State of Washington, that a:
❑ Notice of Land Use Application/Action
Notice of Determination of Significance
(DS) and Scoping Notice
❑ Notice of Environmental Determination
of Nonsignificance (SEPA, DNS)
❑ Notice of Mitigated Environmental
Determination of Nonsignificance (SEPA,
MDNS)
❑ Notice of Land Use Application &
Optional DNS/MDNS
❑ FWRC Interpretation
❑ Other
hereby declare, under penalty of perjury of the
❑ Land Use Decision Letter
❑ Notice of Public Hearing before the
Hearing Examiner
❑ Notice of Planning Commission Public
Hearing
❑ Notice of LUTC/CC Public Hearing
❑ Notice of Application for Shoreline
Management Permit
❑ Shoreline Management Permit
❑ Adoption of Existing Environmental
Document
was ❑ mailed ❑ faxed ❑ e-mailed and/or Xposted to or at each of the attached addresses on
Project Name
MINOR
File Number(s) l- (mi_ `(4 "dD - '�-- (� C/
Signature Date 7k 1
/ 4'0 C-f-
K:\Intern\Declaration of Distribution notices\Declaration of Distribution with Posting Sites.doc
Posting Sites:
Federal Way City Hall - 33325 8th Avenue
Federal Way Regional Library - 34200 1 It Way South
Federal Way 3201h Branch Library - 848 South 3201h Street
Subject Site - posted at Marine View Dr. and SW 296th St next to utility.
K:\Intem\Declaration of Distribution notices\Declaration of Distribution with Posting Sites.doc
_ 1
- - C
CD
m
CL CL
rn
.n
VV
CD
Z CD
O Cl)
CD
C�
cn
N CD
0 cnv
3
�. (CD
N N
E
n
(D
i
CD cn v n
ca)l1 p CD _ �Xr p CD rr t0/� c0/� O
F.0 (pO
'� N O.�
oSm o QQ�
2C .�: rnCD 1;
v CD-0 (n �' cn v' v cnu
c0CL im--3 ,C ��'om—O� � ■.'fi0-3 ::i
9 cn �•—v O v �V D
- � � �' o v N � CD — a) OCn CD
m ❑Q� -�• cn
' co
� a o�=cn
CD w Co�m "S
O n
CD
C9 CD
N CD
N <
E Q cD
CL
CD C
cn
.41k
CITY d'O'::tt=P
OF
Federal Way
DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES
33325 8th Avenue South
Federal Way WA 98003
253-835-7000; Fax 253-835-2609
www.cityoffederalway.com
DECLARATION OF DISTRIBUTION
►,r hereby declare, under penalty of perjury of the laws of the
State of Washington, that a:
❑ Notice of Land Use Application/Action
❑ Notice of Determination of Significance
(DS) and Scoping Notice
❑ Notice of Environmental Determination
of Nonsignificance (SEPA, DNS)
❑ Notice of Mitigated Environmental
Determination of Nonsignificance (SEPA,
MDNS)
❑ i s-mFf Land Use Application &
Optional DNS/MDNS 44,
d,K�+St
❑ FWPC Interpretation aly^d;A'S
❑ Other
❑ Land Use Decision Letter
❑ Notice of Public Hearing before the
Hearing Examiner
❑ Notice of Planning Commission Public
Hearing
❑ Notice of LUTC/CC Public Hearing
❑ Notice of Application for Shoreline
Management Permit
❑ Shoreline Management Permit
❑ Adoption of Existing Environmental
Document
was T (mailed ❑ faxed Xe-mailed and/or ❑ posted to or at each of the attached addresses on
14 � DcE
CX
2011.
Project Name Wers
File Number(s) 11' D - S E
Signature Date 0-7-0 -Q8
K:\CD Administration Fles\Declaration of Distribution.doc/Last printed 1 /4/2011 1:47:00 PM
C[TV OF
Federal Way
ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE
ELDER/MICHAELS SINGLE-FAMILY RESIDENCE
Federal Way File No: 11-102948-00-SE
Proposal: Construction of a new single-family residence on an existing unimproved single-family
residential lot. Site improvements are on and within 25 feet of a geologically hazardous area,
specifically a steep slope hazard area as defined by Federal Way Revised Code. Associated
improvements include stormwater mitigation, water/sewer extensions, driveway paving,
retaining walls, and landscaping.
Applicant: Bly R. Elder, 29410 157`h Avenue SE, Kent, WA 98042
Location: King County Assessor Tax Parcel 119600-4690. The lot is a vacant parcel located at the 1100
block of SW 295`h Street.
Lead Agency: City of Federal Way Community and Economic Development Department
Staff Contact: Matthew Herrera, Associate Planner, 253-835-2638
The Responsible Official of the City of Federal Way hereby makes the following threshold determination based
upon impacts identified in the Environmental Checklist; Federal Way Comprehensive Plan; and other policies,
plans, rules, and regulations designated as a basis for exercise of substantive authority under the State
Environmental Policy Act Rules pursuant to RCW 43.21C.060.
The lead agency for this proposal has determined that the proposed action does not have probable significant
adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW
43.21C.032(2)(c). This decision was made after review of a completed environmental checklist, technical
information reports (geotechnical and stormwater), the city's Critical Areas Ordinance, and other information on
file with the lead agency. This information is available to the public on request.
This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act
on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on
August 15, 2011.
Unless modified by the city, this determination will become final following the above comment deadline. Any
person aggrieved of the city's final determination may file an appeal with the city within 14 days of the above
comment deadline. You may appeal this determination to the Federal Way City Clerk at the City of Federal Way
(33325 8th Avenue South, 98003) no later than 5:00 p.m. on August 29, 2011, by a written letter, accompanied
with the associated fee, stating the reason for the appeal of the determination. You should be prepared to make
specific factual objections.
Responsible Official: Isaac Conlen, Planning Manager, for Patrick Doherty
Position/Title: Community and Economic Development Director
Address: 33325 8d Avenue South, Federal Way, 98003
Date Issued: July 30, 2011 Signature:
Doc I D. 59424
a)
70���
U i
> N C
>+O Cl) Cro- i O� m
E Q a) >+ C cn C a)cc
ca E E— a) L U- a) -m
a) , U o 0 0
WCY) 0Q)> > _ - N oOc
a� U) C U- O OL Q � !Cb El', a �=• N
-0
�xa)0)°c� / a)inE
3 a)in �E
CA 4 O(n�� �O cu Q z c >.
o C) `0 O.- +_..> cv M o a c>u
r C O n
a) U E— — — m
U O O— ,a) O `- co V (0 r M v M o
}'a)ca 1 � -C: E.a)U
i NQ _� U tMLLN
a) a) c �' c:c i o rn4-
c .0 — (B " a) O dj 000
0FF_a)0—.,_, N ..�
U Ca )N ZmUM
v
C
(6
W N
r
CQ U
�
N
C �
U)
CA N
Z
CU
i \
U
M aI l
(D L
� I �
W o
a)
� rn
a -
06/16/2011
City of 300' Parcel City of Federal Way
33325 8lh Ave S
P.O Box 9718
Federal Way Wa 98063
Federal Way Notification area (206) - 835 - 7000
www cityoffederalway.com
119600-4885.;
ff 11960��332
P �a
as
Gp
aaa®
119660-2275 �;a00100
119600-�$Ci`-'"
�� ** 119600-2260
10
119600-
J 119600- 119600- 119600- 2265
1�--*�**r1` 19600-
2290 1 2270 2267 12 00
062104- 119600-2266
TRCT�—°*
I �
062104-
9071 119600-2465 119600-
119600-2397 2658
062104-
062104- 9061
119600-2396
119600-
9053
119600-2485
119600-
119600-2544
2757
2475
119600-2395
062104-9075
062104-9065
- 052104-9001
119600-
119600-
119600- 119600- 119600-4631
4695
4690
4680 4630
119600-
4535
062104-9105 062104-9072
i
Q
062104- 062104-9074
9129
119600-
119600-
119600- 119600-
119600-1119600-
7-
119600-
4830
4816
4790 4775 4755 4740
CD4570
r
SW
296TH ST
515320- 515320- 515320- 195460-0041 195460-0040 195460-0023
515320-0015 0011 0008ylk195460-0017
0021 195460- co195460-
515320- 195460-0045 , 062104-9108 0010
515320- 0005 0046qT
0010 ` 195460-005D — 062104-9059195450-0025
Legend
King County Tax Parcels
Subject Property
Notified Properties
CITY OF
Scale: A Federal Way
N 0 50 100 Feet
I � This map is intended for use as a graphical representation only
The City of Federal Way makes no warranty as to its accuracy
0
rn
v
0
0
0
U
t6
a
O
c
.o
m
U
0
z
+
o
e
M
T ►
G.
r'1
N
O
cc
d1
ff1
N
O
00
01
C�1
O
O
00
D`
M
O
O
00
M
N
O
00
01
C�'1
N
O
w
01
M
al
O
00
01
M
N
O
w
U
�
>
Z
¢
M
N
Cl
00
C�1
N
O
00
M
N
O
00
d\
M
\O
O
00
G�
M
O
O
00
fT
M
O
O
00
d1
fn
O
O
00
O
Cf1
O
O
00
01
M
O
O
00
01
M
N
O
00
�
M
O
O
C,
a1
f(1
N
O
C1i
M
N
O
G\
M
N
O
cc
C`
M
O
O
w
d\
cal
N
O
00
f�l
N
O
00
D1
M
N
O
w
F
M
O
O
w
01
M
N
O
00
a1
M
N
O
0000
Q\
�
ui
WL
0
o0
Q
w
w
a.
w
0
w
a.
w
o
w
w
w
r❑
w
ram,
w
w
w
w
o
w
u
w
Q
w
w
w
o
w¢
w>
U
z
W
Q
w
a
w
w
o
w
o
w
w
w
Q
w
u
w
Q
w
a
w
o
w
u.
w
o
w
a
w
Q
w
w
w
Q
w
w
Q
w
w
w
Q
w
L.
w
o
w
a.
w
n
w
w
w
Q
w
r,
w
g
w
W
w
Q
w
u..w
w
a
w
LT.
w
Q
w
w
w
o
w
w
w
Q
w
w
w
Q
w
u-,
d
CO
N �
w
c/i *k can F" c3n can can E fan can can C/) C/) C/) C/) ((n Cl) cn cn UD
Z > > X > o> u" >>> fn C ci x x x x x x W
i y J d d H d N d ¢ Q d O_ x x O x d x o \moo \moo �o \moo \o 110 d \"o �
Qo w 'nU)-cn o 'A Cl) ztn V)i)Cf)CIOC*Oc3nc3n0cnknV)0m
Q ,--� CDQ� OO DD 00 O 00 kn N d' O kn N
O N O O M V N v� r 'IT kn It It CD�--� O N M \O [-- O D,
N 01 O 01 Q1 01 0\ ol O \0 \D \D \D \D 01 \D M O O O N N
Q
� O
0
C
O
w� d
U �
^y O
L Z Q
Z °a C/) O a'
a w H W
m Z_
ca N Z z
CL
co
a
� m
J ¢ cn C/) W ci Q Z C4
cn cn +
w d � H [�- W H Z cn >
w U Q w W p r� w Z Cl)
�z�H ca7z �"o���i�FF�"'x�¢w xWx
Q O Z C4 U
Z Q a o O¢ H oao cQ7 a a a a. a Z a+ ZO O
U3r O�UQ�w v)a.Upz7zz�ZQ2xu"Qwv,¢ QO
w cn p N w >¢ O z x c7 w w w w w w �1 a d ~� aC
Q cn z ¢ x O W d U GO cn cn � cn � r� H x a N¢ x
Q o
Q O a Z w x a w p 30 C)> O f� O a0 O Q Q>
,Z, E4 u <ImucnC7F- wF- V) En
Q
J
^
O
Q1
O
\p
o
^
O
O\
O
\O
0
r•
O
01
�It
O
\O
0
N
O
C \
O
\D
0
O
01
zT
O
\p
0
In
[-
CD�--�
01
I:T't
O
\p
0
kn
O
01
O
N
0
Vn
\0
N
N
O
O
\O
01
\o
\O
N
N
O
O
\O
01
r
\O
N
(V
O
O
\O
a\
v-)
01
M
N
O
O
\o
Q1
\o
01
M
N
O
O
\O
01
t-
01
M
N
O
O
\o
D1
V-1
�'
CV
O
O
\0
0\
kn
�
N
O
O
\p
O1
W1
00
d'
N
O
O
\O
01
'ITM
to
N
O
O
\o
C\
o
�
-zT
O
O
\o
01
r
M
�
T
O
O
\O
01
o
DO
�
O
O
\o
01
Wn
01
\O
�t
O
O
\D
a1
o
r-
�
O
O
1.0
C�
Ln
Ln
t-
�
O
O
\D
a1
Wn
r
r-
-:t
O
O
\D
0\
O
ON
�
d'
O
O
\O
01
D
00
�r
O
O
\O
(01,
o
M
00
-,T
O
O
\p
01
o
O
O
O
\O
kn
4
(o
O
O
O
\O
It
kn
=
O
CD
O
O
N
M
W)
--i
""
CD
O
O
N
M
Ln
�$]
N
C7
"T
LO
CO
Il-
00
0)
O
N
CO
r
�
LO
CO
00
6)
O
N
N
N
N
cM
N
'qT
04
Lo
N
CO
N
ti
N
00
N
d7
N
O
CM
M
Laser Mailing Labels V a _a Use template CEG03208
Jail -Proof Compare to Avery AVE5160
LAKEHAVEN UTILITY DIST
PO BOX 4249
FEDERAL WAY WA 98063
PUYALLUP TRIBE OF INDIANS
ENVIRONMENTAL REVIEWER
3009 E PORTLAND AVE
TACOMA WA 98404
SOUTH KING FIRE & RESCUE
31617 1 ST AVE S
FEDERAL WAY WA 98003
TACOMA WATER DIVISION
ATTN: Environmental Reviewer
PO BOX 11007
TACOMA WA 98411
DEPT OF ECOLOGY
ENVIRONMENTAL REVIEW SEC
PO BOX 47703
OLYMPIA WA 98504-7703
MUCKLESHOOT INDIAN TRIBE
ENVIRONMENTAL REVIEWER
39015 172ND AVE SE
AUBURN WA 98002
Corporate S I G N A T U R E
Express
1.888.CE TODAY (238.6329)
www.CorporateExpress.com and www.eway.com
1
CITY OF
Federal Way
ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE
ELDER/MICHAELS SINGLE-FAMILY RESIDENCE
Federal Way File No: 11-102948-00-SE
Proposal: Construction of a new single-family residence on an existing unimproved single-family
residential lot. Site improvements are on and within 25 feet of a geologically hazardous area,
specifically a steep slope hazard area as defined by Federal Way Revised Code. Associated
improvements include stormwater mitigation, water/sewer extensions, driveway paving,
retaining walls, and landscaping.
Applicant: Bly R. Elder, 29410 157"' Avenue SE, Kent, WA 98042
Location: King County Assessor Tax Parcel 119600-4690. The lot is a vacant parcel located at the 1100
block of SW 295`h Street.
Lead Agency: City of Federal Way Community and Economic Development Department
Staff Contact: Matthew Herrera, Associate Planner, 253-835-2638
The Responsible Official of the City of Federal Way hereby makes the following threshold determination based
upon impacts identified in the Environmental Checklist, Federal Way Comprehensive Plan; and other policies,
plans, rules, and regulations designated as a basis for exercise of substantive authority under the State
Environmental Policy Act Rules pursuant to RCW 43.21 C.060.
The lead agency for this proposal has determined that the proposed action does not have probable significant
adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW
43.21 C.032(2)(c). This decision was made after review of a completed environmental checklist, technical
information reports (geotechnical and stormwater), the city's Critical Areas Ordinance, and other information on
file with the lead agency. This information is available to the public on request.
This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will not act
on this proposal for 14 days from the date of issuance. Comments must be submitted no later than 5:00 p.m. on
August 15, 2011.
Unless modified by the city, this determination will become final following the above comment deadline. Any
person aggrieved of the city's final determination may file an appeal with the city within 14 days of the above
comment deadline. You may appeal this determination to the Federal Way City Clerk at the City of Federal Way
(33325 8h Avenue South, 98003) no later than 5:00 p.m. on August 29, 2011, by a written letter, accompanied
with the associated fee, stating the reason for the appeal of the determination. You should be prepared to make
specific factual objections.
Responsible Official: Isaac Conlen, Planning Manager, for Patrick Doherty
Position/Title: Community and Economic Development Director
Address: 33325 8`h Avenue South, Federal Way, 98003
Date Issued: July 30, 2011 Signature:
Doc. LD. 58424
CITY OF FEDERAL WAY
DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES
DEVELOPMENT REVIEW COMMITTEE TRANSMITTAL
DATE: July 26, 2011
TO: Kevin Peterson, Engineering Plans Reviewer
Scott Sproul, Assistant Building Official
FROM:
FILE NUMBER(s):
RELATED FILE NOS:
PROJECT NAME:
PROJECT ADDRESS:
ZONING DISTRICT. -
Matthew Herrera
11-102948-00-SE
10-105323-SF
ELDER-MICHAELS Single -Family Building Permit and SEPA
*NO SITE ADDRESS*
RS 15.0
PROJECT DESCRIPTION: Environmental review for proposed single family residence in critical (steep
slope) area.
LAND USE PERMITS: SEPA
PROJECT CONTACT:
RICKELDER
29410157THAVESE
MATERIALS SUBM, (TIED: Environmental checklist; vicinity map; grading and drainage plans; geotech
report by SNR Company; TIR by GeoResources.
CITY OF
t Federal Way
July 29, 2011
Rick Elder
29410 1571h Avenue SE
Kent, WA 98042
CITY HALL
33325 8th Avenue 5pu'LE
th
Mailing Address: PO Box 9718
Federal Way, WA 98063-9718
(253) 835-7000
www.cityoffederalway.com
RE: File #11-102948-00-SE; ENVIRONMENTAL THRESHOLD DETERMINATION
Elder -Michaels, Parcel 119600-4690, Federal Way
Dear Mr. Elder:
City staff has reviewed the environmental checklist you submitted. We have determined that the proposal will
not have a probable significant adverse impact on the environment. As a result, an Environmental Impact
Statement (EIS) is not required to comply with the State Environmental Policy Act (SEPA).
A 14-day comment period is required by the SEPA rules (WAC 197-11-340). A notice inviting comments will
be published in the Federal Way Mirror on July 30, 2011. At the end of the comment period, the department
will decide whether the Determination of Nonsignificance (DNS) should be withdrawn, modified, or issued as
proposed. All final determinations may be appealed within 14 days following the comment deadline. No
licenses, permits, or approvals will be issued until completion of the appeal period.
The decision not to require an EIS does not grant the license, permit, or approval you are seeking from the city.
The environmental record is considered by the decision maker(s) and conditions will be imposed to reduce
identified environmental impacts, as long as the conditions are based on adopted and designated city policy.
After a final decision has been made on your proposal (i.e., after a permit has been issued), you may, but are not
required to, publish a Notice of Action as set forth in RCW 43.21 C.075. The Notice of Action sets forth a time
period after which no legal challenges regarding the proposal's compliance with SEPA can be made. The city is
not responsible for publishing the Notice of Action. However, the city is responsible for giving a notice to
parties of record stating the date for any judicial appeal (including the SEPA portion of that appeal) if your
proposal is one for which the city's action contains a specified time period within any court appeals must be
made.
Questions regarding the building permit's environmental review component should be directed to me at 253-
835-2638 or matt.herrera@cityoffederalway.com.
Sincerely,
Matthew rrera .
Associate Planner
enc_ DNS
Doc. 1 D 58428
CITY OF `<`s ` :' �•
Federal Way
DEPARTMENT OF COMMUNITY DEVELOPMENT SERVICES
33325 81h Avenue South
Federal Way WA 98003
253-835-7000; Fax 253-835-2609
www.cit offederalwa .com
DECLARATION OF DISTRIBUTION
I, zl
. hereby declare, under penalty of perjury of the laws of the
State of Washington, that :
❑ Notice of Land Use Application/Action
❑ Notice of Determination of Significance
(DS) and Scoping Notice
Notice of Environmental Determination
of Nonsignificance (SEPA, DNS)
❑ Notice of Mitigated Environmental
Determination of Nonsignificance (SEPA,
MDNS)
❑ Notice of Land Use Application &
Optional DNS/MDNS
❑ FWRC Interpretation
❑ Other
❑ Land Use Decision Letter
❑ Notice of Public Hearing before the
Hearing Examiner
❑ Notice of Planning Commission Public
Hearing
❑ Notice of LUTC/CC Public Hearing
❑ Notice of Application for Shoreline
Management Permit
❑ Shoreline Management Permit
❑ Adoption of Existing Environmental
Document
was ❑ mailed ❑ faxed 97 e-mailed and/or ❑ posted to or at each of the attached addresses on
7 2011.
Project Name
Signature
Date �7
K:\CD Administration Files\Declaration of Distrbulion.dochcsf printed 7/29/2011 11:50:00 AM
CITY OF 'A
Federal Way
NOTICE
ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE
ELDER/MICHAELS SINGLE-FAMILY RESIDENCE
Federal Way File No: 11-102948-00-SE
Proposal: Construction of a new single-family residence on an existing unimproved single-family
residential lot. Site improvements are on and within 25-feet of a geologically hazardous
area, specifically a steep slope hazard area as defined by Federal Way Revised Code.
Associated improvements include stormwater mitigation, water/sewer extensions,
driveway paving, retaining walls, and landscaping.
Applicant: Bly R Elder, 29410 157"' Avenue SE, Kent, WA 98042
Location: King County Assessor Tax Parcel 119600-4690. The lot is a vacant parcel located at the
1100 block of SW 295`" Street.
Lead Agency: City of Federal Way Community and Economic Development Department
Staff Contact: Associate Planner Matthew Herrera, 253-835-2638
The Responsible Official of the City of Federal Way hereby makes the following threshold determination
based upon impacts identified in the Environmental Checklist; Federal Way Comprehensive Plan; and
other policies, plans, rules, and regulations designated as a basis for exercise of substantive authority
under the State Environmental Policy Act Rules pursuant to RCW 43.21 C.060.
The lead agency for this proposal has determined that the proposed action does not have probable
significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not
required under RCW 43.21C.032(2)(c). This decision was made after review of a completed environmental
checklist, technical information reports (geotechnical and stormwater), the city's Critical Areas Ordinance,
and other information on file with the lead agency. This information is available to the public on request.
This DNS is issued under Washington Administrative Code (WAC) 197-11-340(2); the lead agency will
not act on this proposal for 14 days from the date of issuance. Comments must be submitted no later than
5:00 p.m. on August 15, 2011.
Unless modified by the city, this determination will become final following the above comment deadline.
Any person aggrieved of the city's final determination may file an appeal with the city within 14 days of
the above comment deadline. You may appeal this determination to the Federal Way City Clerk at the
City of Federal Way (33325 8`" Avenue South, Federal Way, WA 98003) no later than 5:00 p.m. on
August 29, 2011, by a written letter accompanied with the associated fee, stating the reason for the appeal
of the determination. You should be prepared to make specific factual objections.
Published in the Federal Way Mirror July 30, 2011
Doc. I.D. 58425
Tina Piety
From: Mary Lou Goss [mgoss@fedwaymirror.com]
Sent: Thursday, July 28, 2011 11:15 AM
To: Tina Piety
Subject: Re: Legal Notices
All taken care of...
Mary Lou
Mary Lou Goss
Federal Way Mirror
Marketing Consultant
cell - 253-229-3041
office - 253-925-5565 ext 3056
On Thu, Jul 28, 2011 at 9:22 AM, Tina Piety <Tina.Piety cityoffederalway.com> wrote:
Hello,
Please publish the attached legal notices (elder -Michaels DNS, 11-102948-00-SE and Public Notice of 2012
Comprenehsive Plan & Development Regulations Amendment Process) in Saturday's (July 30, 2011) issue.
Please furnish affidavits of publication. Thank you,
Tina Piety, Community & Economic Development Department
t
SITE ENVIRONMENTAL, ECOLOGICAL,
HYDROGEOLOGY, AND ENGINEERING GEOLOGY
ERSNR COMPANY CONSULTANTS
July 21, 2011 Project Number: 05-011-006
Mr. Rick Elder and Ms. Diane Michaels
29410157th Ave SE
Kent, WA 98042
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and
Potential Impacts to "East Swale" Ephemeral Drainage System Letter Report
Dear Rick and Diane:
You already have a PDF version of the attached report so you could submit it to the City of Federal Way today. The
attached report is the same, but has slightly different formatting because of the double sided printing we use.
However, both are signed and stamped and the content is exactly the same.
The report was prepared to not only address the immediate need, but to also provide information that may be
necessary later should you want to make any renovations or modification on the property. It was also specifically
designed to encourage the City to work with Peter and Sanchez to fix the western swale area, which could make any
future modifications, including modifications to the access road, easier.
Thank you for choosing SNR Company. If you have any questions or require more information, please contact me at
your convenience.
Sincerely,
SN COMPANY
_e�L -� 74ee-,�
Steven F. Neugebauer
Principal Hydrogeologist/Engineering Geologist
Attachments: Three (3) hard copies of the Evaluation of Proposed "Mitigated" Storm Water Conveyance System
and Potential Impacts to "East Swale" Ephemeral Drainage System Letter Report
-RESUBMITTED
15211 3f" Place NE, Duvall, WA 98019-8370
425-788-3015 • 425-788-6873 (FAX) AUG 112011
http://www.snrcompany.com
110. 1 U 5 "323 CITY OF FEDERAL WAY
CDS
ENVIRONMENTAL, ECOLOGICAL,
HYDROGEOLOGY, AND ENGINEERING GEOLOGY
MRSHR COMPANY CONSULTANTS
July 21, 2011 Project Number: 05-011-006
Mr. Rick Elder and Ms. Diane Michaels
29410157th Ave SE
Kent, WA 98042
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and
Potential Impacts to "East Swale" Ephemeral Drainage System
Elder Residence
295(12) —121h Avenue SW
Federal Way, WA
King County Parcel Number: 1196004690
Dear Mr. Elder and Ms. Michaels:
Per your request, SNR has prepared this hydrologic and engineering geologic evaluation of the proposed storm
sewer system design for the undeveloped property located in Federal way with an approximate United States Postal
Service address of 29512 121h Avenue SW, Federal Way, Washington (Figure 1 - Site Location Map) and a King
County parcel number of 1196004690 (subject property).
Figure 1— Site Location Map
SNR has conducted field studies and research on the subject property and vicinity, including the properties north of
the subject property. SNR's studies extended north to the ordinary high tide line to observe erosional characteristics
and stability of the plateau (bluff) slope. These studies also focused on the relict glacial meltwater channel located
northeast of the subject property (to the shoreline). The field studies were conducted between April and September
2007 and included site reconnaissance, geologic mapping, logging geologic test pits, installation and monitoring of
15211 3rd Place NE, Duvall, WA 98019-8370
425-788-3015 • 425-788-6873 (FAX)
http://www.snrcompany.com
V
a)
CD
CU
a
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21, 2011
piezometers, wetland and stream studies, and other geologic studies.
Site Description
The subject property is an undeveloped, graded (preliminary grading) parcel bounded to the west by a single family
residence, to the north by undeveloped residentially zoned properties and a private access road, to the east by an
undeveloped parcel, and to the south by a single family residences with access on SW 296th Street (Figure 2 — June
11, 2010 Air Photograph from Google Earth Professional). It is located on a "bluff' approximately 550 feet south of
the approximately 106 foot high plateau slope face that extends to the beach along Poverty Bay at an approximate
50% average slope.
Figure 2 - June 11, 2010 Air Photograph from Google Earth Professional
The subject property is located in an area that was annexed to the incorporated municipality of Federal Way (it was
historically located in unincorporated King County) in an area that has changed relatively little since 1990 (Figure 3 —
July 7, 1990 Air Photograph from Google Earth Professional), except for some residential development to the
northeast.
The drainage on the subject property is generally to the northwest, with the existing private storm sewer transporting
storm water towards the City of Federal Way MS4 that bounds the east side of 121h Avenue Southwest (Figure 4 —
Excerpt from the City of Federal Way MS4 Map).
The generalized topography and geomorphology in the vicinity of the subject property has been influenced by the
historic continental glaciation events with the most recent being the Vashon Stade Puget lobe continental glacial
advance and recession. However, the deposits on the subject property have many of the characteristics of a relict
delta fan that may predate the Vashon Stade glacial advance and retreat.
.mot L SNR COMPANY
I
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20, 2011
The subject property is located in a northerly draining basin that has two relict glacial meltwater channels in northerly
draining subbasins, that were apparently formed during the Vashon Stade glacial recession and are now part of the
ephemeral drainage system, with the relict glacial meltwater channel to the west being also used to handle City of
Federal Way MS4 storm water and the relict glacial meltwater channel to the east being used to convey storm water
generated on private roads and properties that bound this ephemeral drainage feature.
SNR COMPANY
Figure 3 — July 7, 1990 Air Photograph from Google Earth Professional
M
Figure 4 — Excerpt from the City of Federal Way MS4 Map a,
CU
a
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21, 2011
Topography
As previously discussed, the subject property is located on plateau (bluff) that has relatively a steep cliff face above
the shoreline of Poverty Bay. The subject property has a relatively moderate slope (a generalized 10% slope) to the
north, northwest, with the slope becoming progressively steeper further to the north (Figure 5 — King County NAP
Hillshade Map with 5 foot Contours).
1
I T>zUCRJ�AL FEATURR:- - 1
KING COUNTY IIAPA.2011f4 ^' • • „ 1..,
Figure 5 - King County NAP Hillshade Map with 5 foot Contours
The subject property is located in an "arc shaped" drainage basin with a north - south drainage divide to the east as
shown on Figure 4. The geomorphology and the USGS Geologic Map of the Poverty Bay Quadrangle suggest that
there is one landslide located to the northeast of the subject property and that the subject property may be located on
or near potential structural feature.
The 1991 USGS topographic map (Figure 6) and the 1898 USGS topographic map (Figure 7) have 25 foot contours,
which do show the drainage basin the subject property is located in, but not the drainage subbasins. However, the
general drainage in this area in the basin (and subbasins) is to the northwest (as is shown in Figure 4).
All of the topographic maps show that that the subject property is located in the southeast corner of the drainage
basin that generally drains to the north, northwest. These maps also suggest that the geomorphology of this area
may include glacial drumlins orientated north — south. Glacial drumlins generally have glacial till surface deposits
and are formed when the advancing continental glacier encounters more resistant materials.
The 1898 USGS topographic map suggests that glacially formed kettle lakes are located to the south of the subject
property. This type of lake is often formed in relict glacial meltwater channels where ice blocks calve from the
receding glacial ice sheet and are buried by recessional outwash deposits. Kettle lakes are also commonly
associated with ice contact deposits such as kame deposits. As shown in the next section, the USGS geologic map
suggests that the deposits on the subject property are pre -Olympic age (Qpogc), glacial deposits (deposited beneath
CU
a
f )
LjU sNH COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20, 2011
the Olympic Interstade deposits) that have been exposed at the surface due to erosion, geomorphology, and possibly
structural controls.
1I1LW
Figure 6 —1991 USGS Topographic Map from King County HAP, 21011
le
^'XAPPP.OxIMP,TF LOCAITON OF 5U13JECT PROPERTY
. .� ��—r' ��•� �'r. �' ,',�.: _ _ It �. {
Figure 7 —1898 USGS Topographic Map from Google Earth Professional
SNR COMPANY
WE
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21. 2011
Geology and Soils
The United States Geological Survey (USGS) Geologic Map of the Poverty Bay 7.5' Quadrangle, King and Pierce
Counties, Washington, Booth et al, 2004 (Figure 8) suggests that the surface deposits on the subject property are
Pre -Olympia age (before the Olympia interstade and the Vashon Staee) glacial deposits that are listed as Qpog,
deposits, however, field studies conducted on and in the vicinity of the subject property suggest that the deposits on
the subject property more closely resemble glacial till deposits, which may correlate to the Qpogt deposits described
by Booth et al. (and are suggested to be present to the north of the subject property on the geologic map).
�w
fQf a�1:
T7310 Qrn
` Qt1 0
G7m "a `IQ61W QPog,
a� =�.Qvva
J �
/ UBJEC7 YF',[ii'CF:',r
gPo9 / Qvr
Elva
A;
yC ova
Qvr
� I fii
ll�rlif j + ■u� lyl
r h!D SCALE'
Cad ,� i ; :-
v
THE GEOLOGIC MAP OF THE POVEFTY 13AY 7.5' QUADP.ANGLE, KING AND PIERCE COUI I lil_ ?•.:i! I:I:!: r'A:. I.`y ",. ILK Waldron,: nd K.G. Trooat 2001-T
Qv r
Figure 8 — USGS Geologic Map of the Poverty Bay 7.5 Minute Quadrangle, Booth et al, 2004
In general the geologic profile suggested by the geologic map is the typical glacial depositional sequence that is most
commonly associated with Puget Lowland continental glaciation events. However, the deposits observed by SNR's
geologists on the bluff faces suggest that the deposition on and in the vicinity of the subject property may have been
glacial till deposits that overly a relict delta fan deposited by a glacial meltwater stream formed during the glacial
advance. This may explain the structural feature, landslide (to the northeast of the subject property), and mass
wasting (Qmw)/landslide (Qls) features that are suggested to be present on the geologic map west of the subject
property.
Glacial advance outwash delta fans tend to be relatively unstable because they are deposited in deeper water than
would normally be present in the Puget Lowlands due to the propensity of these continental glacial advances to block
the flow through the Strait of Juan de Fuca. As the continental glaciation event recedes during the glacial recession,
the ice blocking the Strait begins to float and breakup as berg ice. It is believed that this can lead to a rapid draining
of the impounded water in the Puget Lowlands leaving delta fans exposed without the support of the water they were
deposited in.
L! L, SNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20.2011
Seismic activity, such as has occurred on the Seattle fault zone, is known to have destabilized many of these relict
deltas which collapsed during these events including one that occurred approximately 1,000 years ago (Bucknam
and others, 1992), based on the age of a rooted tree with bark that was present on a relict landslide that slid into
Lake Sammamish in Issaquah, WA (the trees age, 1050 years old)
Deposits of the Vashon Slade of Fraser glaciation of
Armstrong and others (1965) (Pleistocene) —
Consists of:
Ct7ur] Recessional outwash deposits —Stratified sand and
gravel, moderately well sorted to well sorted; less
common silty sand and silt. Generally lightly
oxidized. Deposited in broad anastomosing
outwash channels that carried south -draining
glacial meltwater away from the ice margin during
ice retreat. Deposits less than about 1 in thick not
shown on map. Locally subdivided into:
�vrt Recessional lacustrine deposits —Very fine-
grained sand, silt, and clay deposited in small
lakes during ice recession
pvz Recessional coarse -grained lacustrine
deposits —Composed of coarse -grained sand,
forming crude terraces as high as about 30 in (100
ft) above Poverty Bay. Probably subaqueous
deposits of streams flowing into one of ice -
dammed lakes that idled trough of Puget Sound
late in ice recession
Uvt Ice -contact deposits —Deposits that are similar in
texture to unit Qw but commonly are less well
sorted and have silt -rich matrix. Contains lenses
and pods of till. Most voluminous ice -contact
deposits flank valley of Green River in northern
part of quadrangle, forming kame terrace built
against late -recessional ice tongue in Green River
valley. Locally subdivided into:
ihse Eskers, -.Sinuous ridges of glaciofluvial sand and
gravel
Till —Compact diamict containing subrounded to
well-rounded clasts in massive, silt- or sand -rich
matrix. Glacially transported and deposited.
Generally a few meters to a few tens of meters
thick, forming undulatory surface. Also found
sporadically within areas mapped as unit Qvl
Qva Advance outwash deposit&--Well-bedded sand and
less common gravel deposited subaqueously or by
streams and rivers in front of advancing ice sheet.
Almost devoid of silt or clay, except near base of
unit. Generally unoxidized and commonly very
compact
aplo Coarse -grained deposits —Sand and gravel
predominate
opr�s Nonglacial deposits —Abundant organic debris or
pumice indicates nonglacial origin
Olympia beds of Minard and Bootle (1988)
(Pleistocene) —As much as 15 in of andcsitic
and pumiceous sand and lahar deposits, having
paleosol developed on upper surface; locally
overlain with as much as 1 in of peat and tephra.
Assigned to the Olympia nonglacial interval of
Mullineaux and others (1965) on the basis of
finite radiocarbon dates on peat of 27,530*390,
32,040t690, and 36,650*72 yr B.P. (samples
ISGS-3301, Beta-80937, and Bela-87981)
Deposits of Pre -Olympia age
(Pleistocene) —Fine-grained
deposits—SiIt at north edge of map;
underlies glacial deposits of pre -Olympia age on
adjacent Des Moines 7.5' quadrangle
Glacial deposits ---Weakly to strongly oxidized
silt, sand, and gravel of glacial origin as
determined by clast provenance. Underlies all
Vashon-age deposits and so also must be of pre -
Olympia age. Locally mapped as:
Coarse -grained deposits —Sand and gravel
L_J
predominate
Fine-grained deposits —Silt and clay pre-
dominate
Till deposits —Till or other diamict pre-
dominate
Nonglacial deposits --Silt, fine- to medium -
grained sand and gravel, pumice, and
mudflow, exposed low on valley walls of the
Green River
4r
Reversely magnetized deposits (Pleistamne>—Silt,
fine- to medium -grained sand: volcanic ash,
pumice, and mudflows; and compact oxidized
till and stratified sand and gravel. Mapped as
reversely magnetized where deposits of the Lake
Tapps tephra of Crandell (1963) as dated by
Figure 9 — Excerpt from the Geologic Map of the Poverty Bay 7.5 minute Quadrangle Legend
As previously discussed, SNR conducted geologic field studies on and in the vicinity of the subject property; these
field studies included the logging of test pits excavated by a trackhoe and logging of deposits exposed on the cliff
face of the bluff. These studies revealed layered stratigraphy that, as is discussed above, that can be associated
with delta fan deposition with the general dip of these beds being to the north. Figures 10 and 11 show the
depositional layering observed from the beach along Poverty Bay. a
0)
CU
tZ
SNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21.2011
Figure 10 — Bluff Cliff Face Looking South
The deposits observed in Figures 10 and 11 include cross bedded sands and small gravels and generally trend from
silty, pebbly fine sands and sandy silts to gravelly medium to coarse sand. The upper section and a lower section
have some cementing and are generally more resistant to erosion.
As would be expected, due to the steepness of the slope and near shore erosion during storm events, these bluff
faces are prone to mass wasting. This propensity for mass wasting is why some of these bluff faces are protected by
bulkheads, which reduce the slope undercutting caused by wave action.
As shown in Figures 12 — 14, the surface and near surface deposits on the subject property have layered
stratigraphy, similar to that observed on the bluff face. The hydraulic conductivity for these soils varies, depending on
00 the amount of cementing, the sorting, and the size of the grains in the matrix, with the sandy gravelly deposits having
a)
0)
co
a
SNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20.2011
high apparent hydraulic conductivity, which is why seeps are observed on the bluff face on the surface of the pebbly
sandy silts that underlie these coarser and better sorted deposits.
Figure 11 — Bluff Cliff Face Looking Southeast
fi• �._'�l.,r:� ,;;` __mac'. +�
~ �:r.iMr � � .��r 'ir ..,�:,• war .- , - ..
Figure 12 — Typical Test Pit Stratigraphy, note Layering
SSNR COMPANY
W
CD
ca
a
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21, 2011
Ak
irJ'�11r'.��]`-i
Jill
Figure 13 — Typical near Surface Deposits
0
Figure 14 — Typical Deposit observed below Surface Deposits
CU
EL
WO SNH COMPANY
1
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE; Evaluation or Proposed "Mitigated' Storm Water Conveyance System and Potential Impacts to 'East Swale" Ephemeral Drainage System
July 20, 2011
The test pits were logged by Cornerstone Geotechnical Consultants of Woodinville, Washington. The test pit logs
are presented below.
LOG OF EXPLORATION
DEPTH
USC
SOIL DESCRIPTION
TEST PIT ONE
0 0- 4.0
SM-OL
BROWN SILTY MEDIUM SAND WITH A TRACE OF CLAY (LOOSE TO MEDIUM DENSE,
DAMP) (FILL)
4 0- 6.8
SM
GRAY SILTY FINE TO MEDIUM SAND (LOOSE, WET) (POSSIBLE FILL)
6.8- 7.0
SM
LIGHT BROWN FINE TO MEDIUM SAND WITH A TRACE OF GRAVEL AND SILT
(MEDIUM DENSE, DRY TO DAMP) (SALMON SPRINGS DRIFT)
SAMPLES WERE COLLECTED AT 1.5 AND 6 0 FEET
GROUND WATER SEEPAGE WAS ENCOUNTERED @ 4 FEET, STANDING WATER @ T
TEST PIT CAVING WAS ENCOUNTERED @ 3 FEET
TEST PIT WAS COMPLETED AT 7 0 FEET ON 8-30-2007
TEST PIT TWO
0 0- 3.5
SM-OL BROWN FINE TO MEDIUM SAND WITH A TRACE OF SILT (LOOSE, MOIST) (POSSIBLE
FILL)
35-7.0
ML GRAYISH BROWN SANDY SILT WITH FERROUS STAINS (STIFF TO HARD, MOIST)
(POCKET PEN AT 4.5 TSF @ 5 FEET)
7.0-12.0
ML BROWN SILT (STIFF, MOIST) (SALMON SPRINGS DRIFT)
SAMPLES WERE COLLECTED AT 1.0, 3.5 AND 9.0 FEET
GROUND WATER SEEPAGE WAS NOT ENCOUNTERED
TEST PIT CAVING WAS NOT ENCOUNTERED
TEST PIT WAS COMPLETED AT 12.0 FEET ON 8-30-2007
TEST PIT THREE
0.0-0.5
SWOL
DARK BROWN HIGHLY ORGANIC SILTY FINE TO MEDIUM SAND W/ SOME ROOTS
(LOOSE TO MEDIUM DENSE, DRY TO DAMP) (TOPSOIL)
0.5- 2 5
ML
BROWN SANDY SILT WITH A TRACE OF CLAY (MEDIUM STIFF TO STIFF, DAMP)
2. 5 -3 0
SM-OL
BROWN HIGHLY ORGANIC SILTY SAND WITH SOME ROOTS (MEDIUM DENSE, MOIST)
(ORIGINAL TOPSOIL)
3.0-9.0
CL
GRAYISH BROWN SILTY CLAY WITH FERROUS STAINS @ 5 FEET (STIFF TO HARD,
MOIST) (POCKET PEN AT 4.5 TSF @ 7 FEET)
9 0 -10.0
ML
GRAY SILT (STIFF, MOIST)
10.0-11.5
ML
GRAY CLAYEY SILT WITH FERROUS STAINS (STIFF, MOIST) (PUYALLUP
FORMATION)
SAMPLES WERE COLLECTED AT 2.0, 5.0, 9.0 AND 11.5 FEET
GROUNDWATER SEEPAGE WAS NOT ENCOUNTERED
TEST PIT CAVING WAS NOT ENCOUNTERED
TEST PIT WAS COMPLETED AT 11.5 FEET ON 8-30-2007
SNR COMPANY
CORNERSTONE GEOTECHNICAL, INC.
FILE NO 2387
FIGURE 4
Figure 15 — Test Pit Logs 1 - 3
V-
W
m
cc
a_
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21. 2011
LOG OF EXPLORATION
DEPTH
USC SOIL DESCRIPTION
TEST PIT FOUR
0.0-4.0
ML BROWN SANDY SILT WITH SOME CONSTRUCTION DEBRIS (MEDIUM STIFF TO
STIFF, MOIST) (FILL)
4.0-11.0
CL GRAY CLAY WITH SAND AND A TRACE OF GRAVEL (MEDIUM STIFF TO STIFF,
MOIST) (PUYALLUP FORMATION)
SAMPLES WERE COLLECTED AT 2.0, 6.0, 8.0 AND 11 0 FEET
GROUNDWATER SEEPAGE WAS NOT ENCOUNTERED
TEST PIT CAVING WAS ENCOUNTERED @ 3.0 FEET
TEST PIT WAS COMPLETED AT 11.0 FEET ON 8-30-2007
TEST PIT FIVE
0.0- 5.0 SM BROWN SILTY FINE TO MEDIUM SAND (LOOSE TO MEDIUM DENSE, MOIST) (FILL)
5.0-10.0 SM GRAY SILTY FINE TO MEDIUM SAND WITH FERROUS STAINS (MEDIUM DENSE,
MOIST) (SALMON SPRINGS DRIFT)
SAMPLES WERE COLLECTED AT 1.5, 5.0, AND 8.0 FEET
GROUND WATER SEEPAGE WAS NOT ENCOUNTERED
TEST PIT CAVING WAS ENCOUNTERED @ 3.5 FEET
TEST PIT WAS COMPLETED AT 10.0 FEET ON 8-30-2007
TEST PIT SIX
0.0-1.0 SWOL DARK BROWN HIGHLY ORGANIC SILTY SAND WITH SOME ROOTS (LOOSE, MOISTP)
(TOPSOIL)
0.5- 5.0 SM BROWN SILTY FINE TO MEDIUM SAND (MEDIUM DENSE, MOIST) (FILL)
3.0-11.0 SM GRAY SILTY SAND WITH FERROUS STAINS (MEDIUM DENSE, MOIST) (SALMON
SPRINGS DRIFT)
GROUNDWATER SEEPAGE WAS NOT ENCOUNTERED
TEST PIT CAVING WAS NOT ENCOUNTERED
TEST PIT WAS COMPLETED AT 11.0 FEET ON 8-30-2007
I MI.)
" SNR COMPANY
CORNERSTONE GEOTECHNICAL, INC.
FILE NO 2387
FIGURE 5
Figure 16 — Test Pit Logs 4 — 6
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20.2011
The test pit locations are shown on Figure 17, Test Pit Location Map that also shows the "eastern drainage Swale",
relict glacial meltwater channel. The wetland shown on this figure was declassified because wetland hydrology is not
present and because the area is smaller than the regulatory size in the Federal Way critical areas ordinance.
Piezometer P2 (and the associated test pit) was logged on the subject property.
I
Figure 17 — Test Pit Location Map
The test pit log for P-1 suggest that fluvial deposits are present at the "head" of the eastern relict glacial meltwater
channel and are believed to continue to the north. These deposits are believed to be underlain by the older pre -
Olympic glacial deposits potentially associated with a relict delta fan. These deposits range from medium dense to
hard (with the sandy silt apparently being the most resistant deposits based on observations made in the test pit M
excavations).
CU
0—
SpSNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21, 2011
Soils
SNR used the NRCS Soil DataMart to generate a soil map of the subject property and vicinity. The soil map for the
subject property (Figure 18) suggests that Kitsap soils are present on the subject property that Alderwood-Kitsap
soils are present to the north and Alderwood soils are present to the south.
� I��NYiiY YWINnOm
P
_01; V'"E. �r '. 1
• r ..y W -
._ 1 �'---
. T� i r'SUI3JECT PROPERTY
"Ilk A • .trf —
...f '+��• { . d, a
•z -yrj r , #�11 Flow _ --
0. .4 APrya r
u" A, . it
Figure 18 — NRCS Soils Map for the Subject Property and Vicinity
Map Unit Legend
King County Area, Washington (WA633)
Map Unit Symbol
Map UNt Name i
Acres In AOI
Percent ofAO1
AgB
Alderwood gravelly sandy loam, 0 to 6
percent slopes
0.8
1.1
3.8%
5.8%
AgD
Alderwood gravelly sandy loam, 15 to 30
percent slopes
AkF
Alderwood and Kltsap soils, very steep
4.0
20.2%
Cb
Coastal beaches
1.2
5.9%
KpC
Kitsap slit loam, 8 to 15 percent slopes
12.0
60.5%
Subtotals for Soil Survey Area
Totals for Area of Interest
19.1
19.9
96.1 %
100.0%
■w
..
Figure 19 — NRCS Soil Map Legend
CU
a
SNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20, 2011
The NRCS soils map assumes that the soils on and in the vicinity of the subject property are Vashon age glacial
deposits, however, this is inconsistent with the 2004 Geologic Map of the Poverty Bay 7.5 minute Quadrangle and
with field observations. Although the surface soils do have some of the characteristics of glacial till, alluvium
(including fluvial deposits on a delta fan), and lacustrine deposits, it is more likely that the sandy silt deposits and
sands were deposited on a delta fan which would have some of the characteristics of lacustrine deposits (delta fans
form when stream or rivers discharge to standing water, which includes lakes and marine waters).
Additionally the soils formed in the deposits on the subject property are relatively shallow and generally do not closely
match the type description for Alderwood and Kitsap soil series soils. With the type location for Alderwood soils
being near Maltby, Washington (Figure 20 — Type Location for Alderwood Soil Series Soils) in a glacial lodgment till
plain which appears to be inconsistent with the depositional environment for the subject property and vicinity (the
geologic map suggests that glacial till surface deposits are present to the south).
Figure 20 — Type Location for Alderwood Soils near Maltby, WA
_I Surface Water Hydrology
Surface water on the subject property drains to the same regional drainage basin, however, there are minor drainage
subbasins created by localized depositional features, geomorphology, and structural features. The surface soil on
the subject property has a predicted low hydraulic conductivity and the subsurface stratigraphy and bedding
- orientation makes storm water infiltration impractical and undesirable. Additionally, most of the precipitation on the
subject property is either removed by evapotranspiration or via ephemeral drainage that follows both "natural' and
manmade topography (including manmade storm sewer systems).
~ + Most of the vegetation on the subject property is seasonal or deciduous, which means that evapotranspiration is
minimal during the rainy season and that most of the precipitation leaves the site as ephemeral surface water flow.
�l There are only two potential ephemeral drainage pathways for these surface water flows to drain from the subject
ns
a
SNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21, 2011
property, the "western Swale" that drains across the Townsend and Sanchez properties to the northwest and the
"eastern Swale" that drains on the Townsend and a small portion of the Ernst Ang properties (parcel number
1196002266) north. The western Swale is technically a City of Federal Way permitted point source MS4 conveyance;
however, the eastern Swale may or may not be a permitted MS4 conveyance but it is shown on the City of Federal
Way storm water facility map as being a conveyance (Figure 4).
Regardless, the eastern Swale does receive storm water from private storm water systems that drain storm water
from catch basins and downspouts located in the eastern drainage subbasin; including storm water from access road
catch basins (Figure 21 — Photograph of Storm Water Tightline in the Eastern Swale).
Figure 21 — Photograph of a Storm Water Tightline in the Eastern Swale
Additionally, due to the excavation of a roadside ditch drainage system on the private access road used to access the
subject property from 121h Avenue Southwest and the diversion of storm water from the properties to the south of the
subject property into this drainage area, much of the surface water in the southern portion of this drainage basin is
diverted to the western Swale that passes through the Sanchez property, removing some of the surface water flows
that would normally drain to the eastern Swale area.
CD Prior to development, the eastern drainage Swale drainage subbasin received approximately 6.7 acres of ephemeral
a) surface water flow, depending on evapotranspiration (the soils in this area are anticipated to have a hydraulic
ns
EL
kd ti SNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
JuE .2011
conductivity of 10-3 cm/sec or less) and with the slope in this area that averages approximately 20% (from the head of
the drainage subbasin to the mouth), very little surface water infiltration will occur, which means that the surface
water drainage in this area is not much different from the current developed drainage (other than minor
evapotranspiration) that it would have been in the pre -development days, because of the low potential for ground
water infiltration due to the type of surface soils and the slope of the eastern Swale drainage subbasin.
However, due to development of this area, much of the surface water that would normally drain to the eastern
subbasin now drains to the western subbasin or to the City of Federal Way permitted MS4 storm water system on
SW 2961h Street. This means that approximately 3 acres of surface water flow that would naturally flow to the eastern
Swale is actually flowing to the City of Federal Way permitted MS4 storm sewer system on SW 296 or to the western
Swale which is the City of Federal Way's permitted MS4 storm water conveyance.
If all of the storm water from the remaining undeveloped parcels in the western Swale drainage area were diverted to
the eastern Swale, this would only account for approximately 1.5 acres of surface water flow, significantly less than
what naturally drained to this drainage subbasin prior to the development of this area. Additionally, the current
ephemeral flows in the eastern Swale are underfit for the actual size of this drainage feature (especially when you
compare this drainage feature to the western Swale).
Based on field observations made during field activities conducted on June 25, 2007 there is no evidence of
significant erosion occurring at the mouth of the eastern Swale, mostly because this ephemeral drainageway has
created a stepped channel on erosion resistant deposits and because this drainageway is moderately to highly
vegetated. Based on the erosion resistance of the near vertical bluff faces this channel is formed in, it is anticipated
that adding additional surface water flow to this drainage feature will not create any more erosion than would occur if
the entire natural sub -drainage area drained to this ephemeral drainage feature.
Ground Water Hydrology
The test pits and observations made of the bluff face strongly suggest that naturally occurring unconfined ground
water aquifers are not present within 160 feet of the ground surface on the subject property. Due to the hydraulic
characteristics of the surface soils and the general slope of this drainage basin, potential ground water recharge is
anticipated to be minimal.
However, there is potential for nuisance ground water recharge from buried utilities (including sanitary sewer, water
lines, septic systems, and storm water facilities) that can transport ground water from other areas to this topographic
low point or where leaks in the pipes and tigthlines can cause localized recharge to deeper deposits. However, due
to the stratigraphy, sedimentology, and the geomorphology of this area it is unlikely that these sources or potential
natural sources of ground water recharge will result in the creation of a ground water aquifer. What is more likely is
that these sources of recharge can create unsaturated zone preferential flows that can form seeps on the bluff face to
the north.
There were no springs or significant seeps observed on the bluff face during the June 25, 2007 field activities and
none of the well logs for wells in this are suggest that ground water is present within 160 feet of the ground surface
(corrected for elevations), with all of Ecology's water well logs in the vicinity of the subject property suggesting that
groundwater is at leastl60 feet below ground surface. Most of the wells in the "vicinity" of the subject property in the
Ecology well log database are screened at 300 feet below the ground surface, with one well being screened at 120
feet below the ground surface (this well is a Lakehaven well located a mile south at mirror lake at an elevation of 331
feet ASL — the subject property is located at 210 — 265 feet ASL).
n3
a
.il 1 1 SNR COMPANY
co
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21, 2011
One of the reasons infiltration is not a viable option on the subject property is that the surface soils have low hydraulic
conductivity, the other reason is because geology of this area suggests a potential delta fan depositional
environment, with the beds dipping to the north. Intentional, concentrated infiltration in the deeper deposits on this
site could lead to an increase in unsaturated zone preferential flows along bedding planes which can contribute to
slope instability.
Direct flow, attenuated surface water discharge on the deposits with low hydraulic conductivity in the existing
ephemeral drainage features is preferential to conducting infiltration on this site. The eastern drainage is believed to
have been present since the Vashon Stade glacial recession and the slopes in this area have remained fairly stable
with the natural hydrology of this area. Adding surface water flows that are less than or equal to the natural pre -
development flow in this feature should not contribute to potential ground water recharge or significant increases in
erosion potential.
Other Studies
SNR has reviewed several reports, drawings, and other documents that have been prepared for the subject property
and vicinity, including:
1. Preliminary Geotechnical Report, Cornerstone Geotechnical, September 25, 2007
2. Geotechnical Report, Parcel #1196004690, Southwest 295th Street, Federal Way Washington, Mr. Rick
Elder, Robinson and Nobel, June 25, 2010.
3. Engineered Plan, Single Family Residence, XXX —121h Ave SW, Federal Way, Washington, PN
1196004690, Prop. Elder.12thAVSW.DRNr, GeoResources, LLC, July 14, 2011.
The primary difference between SNR's interpretation on the geology and hydrology on the subject property and those
made by Cornerstone, Robinson and Nobel, and GeoResources pertains to the interpretation on the depositional
environment and the type of soils that appear to be present on and in the vicinity of the subject property and possibly
on the natural predevelopment drainage areas. SNR believes that the deposits on the subject property are actually
pre-Vashon deposits as has been interpreted by Booth et al, 2004. Based on the stratigraphy, structural geology,
sedimentology, and geomorphology of this area, SNR interprets this depositional environment to have been a
potential delta fan that may have undergone historic slumping during historic seismic events such as the historic
seismic event on the Seattle Fault Zone approximately 1,100 years ago.
However, SNR believes that the hydraulic conductivity of the surface deposits and the soils that have formed in these
deposits are most likely no greater than would be expected for Alderwood soil series soils. The primary difference in
these interpretations is that if the deposits beneath the subject property are relict delta fan deposits and these
deposits do have the characteristics SNR believes they have, it would be highly inadvisable to infiltrate any storm
water in this area to avoid potential impacts to the stability of this bluff area.
Proposed Storm Water Management
SNR has reviewed the Drainage Plan (C-1) prepared by GeoResources, LLC geotechnical engineers (Figure 22 —
Excerpt from GeoResources Drainage Plan C-1) for the proposed storm sewer system, that will convey storm water
generated on the subject property to the eastern Swale located northeast of the subject property. This proposed
storm sewer system would include an 8" ADS tightline in a 10 foot wide storm sewer system easement that extends
approximately 210 feet north of the private access road that Google Earth Professional suggests an "extension" of
SRSNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
1 RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20.2011
Marine View Drive (with the centerline of the 10 foot easement being perpendicular with the northwest corner of the
proposed residence) to a type 1 catch basin.
I
2 { n
, E755ING pRAvYtE 31R 1 - i l
,
BLCC.W 24 Porcel No�ti ` ~`- \r
BPtNNA 1196aD2�65 '` [!R/B0.iE0FA1L�l
_ AsAufu[. 1Rk[ m to rerxr
A rI rr-` RIG: TC ouAP)_n' SPA[t PAD s f
AEtlelo oN "An I> f+RB.0 C-J
t• I rr rr 1�f — 8,•;' A - *p - m
f�
r
I r
9 ,, f (
SOQ.9G _
t JN GpMLCI IQ^1�1 'E1 W M1I
f ram` Xw1145lvpinn [W • ~
ttPE
[VOKEa I
�
1ARI
I
I
I
`
--PARCEL NO,
1196002475
---------------- ------------
II B" PVC Sewer f r
I t
S rR S
I
!
---,-� -
rr
L----------------------=K=_ --_-_-_---___--_---------
f7QStMlG
10 SESlfli I
ECMEi']i iI
I ,��`,., IY PASS ABOVE SEVER - �_--------
l Aifgrat Yn
{
i I
r w"1' foQT
•f YIYRAnor - trio xsrr
--
- rr
♦ Pp1p" 1G WS1lytA1F r-
I EMTGOYQIOIr IRl1CIlwE
r------
1Fsur+
\ I ---------i-
I \\ I �. 1 --
r
VERIFr`�\ i
D \\ I N
I $\I i +I I/ --------
I
W
0LO,1 ®�
n
cli
- LLJ 0
(50
\\ �
{ 86W&RiiDCA'MON IALL031niLD _
IVBRr • --,
- l�
Q CY)II
I
"]OR ANY
I I I j CON$7RllL"i'FON• h[o avrk (W
n- 1 J
I I 1 RACFI++ILOCATIOH TU F7iYSfCALLY
_
0
+ + i VERiSY ABY�i�t AND PSTA{�WSii
E r I
I
I 1 1 I PROPF� SSPRRAVON.
_
It
I
-�--
+
I
[
10.0 + � r I I I ! r
UY T
2d" FI
r
f
I 5
VERSr } I Q25" 4PIC
Y�
I
�+ I I I 1�
F �a i�
I i �� `'�
1 i d
J/ slaw io E�$5 AIM SEWER
Aliqn
I 7
fWr rJ f Ir
iqY}
jf
W GAS STUB � r
r
ell
»iT CCC MAT EI E • ?Y C I OGAS4STUR
F10' STORMEMENT 1
+
I B' PVC Sewer Llea j
g _ gam-—g»J1C.
f
- Figure 22- Excerpt from the GeoResources Drainage Plan (C-1) a
[a
a
�SNR COMPANY
0
N
4)
C
C6
0-
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 21.2011
The 8" diameter ADS tightline storm sewer system then trends 98 feet east from the type 1 catch basin to another
type 1 catch basin and then 13 feet due north in an 8" ADS tightline to a type 1 catch basin that will discharge the
storm water to a quarry spall erosion prevention pad located in the northwestern portion of the relict glacial meltwater
channel approximately 220 feet north of the private access road.
Based on the King County iMAP assessor report, the subject property is 19,550 square feet in area and based on the
GeoResources Drainage Plan, the proposed dwelling and driveway/parking area have a combined area of
approximately 6,200 square feet (of impervious surfaces).
GeoResources Technical Information Report (TIR) required by the King County Surface Water Design Manual, 2009
(KCSWDM) indicates that the pre -developed area of the subject property is 0.43 acres with a soil classification of "C"
and that the developed conditions would have 0.2 acres of impervious surface and 0.41 acres with soil classification
"C", with the slope changing from steep "forested" to moderate "lawn" (the impervious surface is flat).
GeoResources used the Western Washington Hydrology Model (WWHM) to calculate the changes in storm water
flows based on existing conditions and the proposed "mitigated" changes to the surface water hydrology by the
addition of the 0.2 acres of impervious surfaces that will be collected into the storm water conveyance system
designed by GeoResources.
The WWHM suggests that the more common 5 year occurrence storm events for the pre -developed conditions are
0.025242 cubic feet per second (cfs) and that the post -developed mitigated flow for a 5 year occurrence storm event
will be 0.018744 CFS. The 1 % event flows for pre -developed conditions is 0.04242 cfs and the post -developed
mitigated flow would be 0.050148 cfs (a difference of 0.007728 cfs).
Findings
The WWHM predicted flow for the more common 5 year occurrence storm events is actually lower for the post -
developed mitigated flows. With the dispersion design proposed by GeoResources and based on the WWHM data, it
is evident that the added flow to the eastern Swale is still significantly less than what the natural drainage to this
Swale has been historically. Considering this geomorphology of this ephemeral surface water drainage feature has
not apparently undergone any significant recent changes (at least since this area of Federal Way was developed as it
is now) suggests that this feature is stable for significantly higher amounts of ephemeral surface water flow and has
sufficient capacity for the proposed diversion of the mitigated storm water flows from the subject property as
designed by GeoResources.
Conclusions
The GeoResources proposed storm water system design for managing the storm water generated on the subject
property passed the WWHM tests and the predicted discharge flows even for a 1 % storm event are modest
compared to the natural pre -developed flows that originally entered the eastern Swale, ephemeral drainage feature.
Providing the proposed dispersion system minimizes the concentration of the discharged storm water in accordance
with the KCSWDM, 2009, it is not anticipated that the diversion of the storm water generated on the subject property
to the eastern Swale will detrimentally impact this ephemeral drainage feature.
SRSNR COMPANY
Mr. Rick Elder and Ms. Diane Michaels
Project Number: 05-011-006
RE: Evaluation of Proposed "Mitigated" Storm Water Conveyance System and Potential Impacts to "East Swale" Ephemeral Drainage System
July 20.2011
This evaluation included an analysis of the surface geology, surface water hydrology, and hydrogeology observed on
the subject property by me and my review of the geomorphology based on topographic maps and LiDAR imagery. It
also included the review of the references cited in this letter report.
Sincerely,
SNR C MPANY
---?74"�
-
Steven F. Neugebauer
Principal Hydrogeologist/Engineering Geologist
State of Washington Licensed Hydrogeologist/Engineering Geologist
License Number: 000347
N
SNR COMPANY
lr. c- (Z E 01
Appended on: 12:04:45 Wednesday, August 31, 2011
Developed Event Summary FILE
i
Event �eak Q (cfs) Oeak T (hrs) Hyd Vol (acft) Area (ac) Method Raintype
100 eta 0.2123 8.00 0.0736 0.1675 SBLTH TY� PEIA I
Record Id: evelvped
Design Method
;Hyd Intv
Pervious Area (AMC 2)
'Pervious CN
;Pervious TC
SBUH Rainfall type
10.00 min Peaking Factor
Abstraction Coeff
0.00 ac DCIA
r --
F 0.00 DC CN
0.00 min DC TC
TYPEIA
484.00
_r 0.20
-1-0.17 ac
98.00
5.O min'
imn0 - -
Directly Connected CN Calc
Description
SubArea Sub cn
Impervious surfaces (pavements. roofs. etc) i
DC Composited CN (AMC 2)
0.17 ac f 98.00
j 98.00
Type
Directly Connected TC Calc
Description Length Slope Coeff
Misc TT
`Fixed j
5.00 min
Directly Connected TC
—
5.00min
I
Licensed to: Contour Engineering PLLC
RESUBMITTED
SEP 0 8 2011
CITY OF FEDERAL WAY
CDS
Worksheet for 8" diameter ADS
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient 0.014
Channel Slope 0.01000 ft/ft
Diameter 8.00 ft
Discharge 0.21 ft3/s
Results
Normal Depth
0.10 ft —�
t C>0
Flow Area
0.12
ft'
Wetted Perimeter
1.80
ft
Top Width
II J8
ft
Critical Depth
0.11
ft
Percent Full
1.3
%
Critical Slope
0.00690
Wit
Velocity
1.75
ft/s
Velocity Head
0.05
ft
Speck Energy
0.15
ft
Froude Number
1.19
Maximum Discharge
911.00
ft3/s
Discharge Full
846.88
ft3/s
Slope Full
0.00000
ft/ft
Flow Type
SuperCritical
GVF Input Data
Downstream Depth
0.00
ft
Length
0.00
it
Number Of Steps
0
GVF Output Data
Upstream Depth
0.00
ft
Profile Description
Profile Headloss
0.00
ft
Average End Depth Over Rise
0.00
%
Normal Depth Over Rise
1-26
%
Downstream Velocity
Infinity
ft/s
Upstream Velocity
Infinity
ft/s
Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster 108.01.071.001
8131/2011 12:10:13 PM 27 Slemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 2
Worksheet for 8" diameter ADS
GVF Output Data
Normal Depth
0.10
ft
Critical Depth
0.11
ft
Channel Slope
0.01000
ft/ft
Critical $lope
0.00690
ft/ft
Bentley Systems, Inc. Haestad Methods Solution Center Bentley FWa Master [08.01-071.001
8/31/2011 12:10:13 PM 27 Stemons company Drive suite 200 w Watertown. CT 06795 USA +1-203.755-1666 Page 2 of 2
CITY OF
Federal
January 22, 2010
Peter Townsend
29508 12th Ave. SW
Dr. Ramon Sanchez
29411 12th Ave. SW
Dr. Rick Edwards
29514 12th Ave. SW
Federal Way, WA 98003
CTIFY HALL
33325 8th A` 8l'1LIC Snouth
Mailina Address: PO Box 9718
ay
Federal Way, VVA. 98063-9718
(253) 8 35-7000
;11WW.cityoffederahw,y. ^C,.'t,
Re: City of Federal Way Surface Water Management Division
Recommendations for addressin Surface Water Man- ement Issues at 12th Ave. SAY
Dear Gentlemen,
The purpose of thisIetter is to .provide recommendations to improve conditions related to the ongoing
Surface Water Management issues discussed below which were brought to the attention of the city. by Mr.
Townsend and Mr. Sanchez.
• Issue # l
City staff observed that during intense rainfall events, roadway:runoff flows over the top of the existing
:low height asphalt berm located at the northerly terminus of 12t' Ave. SW into Dr. Sanchez's driveway.
This area is located partially on the city's 12°i Avenue SW Right of Way (ROW) and partially on Dr:
Edwards :property.
Recommendation No. 1
We recommend that Dr. Sanchez submit a re uest to the city to increase the height of the berm to
reduce the fre uenc andquantiy of roadway runoff that enters his driveway. The citV is willin to
erform this work at no cost to the residents but would need to .obtain concurrence from the parties
affected by the berm before proceeding.
Recommendation No. 2:
We recommend that anew runoff diversion berm be installed 4Rproximatel 75 feet further u the hill
to -direct runoff that currently flows to the parcel located above Dr. Sanchez to instead flow into the 12�
Avenue SW roadside ditch. This would hel alleviate the amount of surface water that flows into Dr.
SancheZ s, arcel. The cijy is willing to perform this work at no cost to the residents but would need to
obtain concurrence froze the parties affected by the berm before proceeding.
• Issue #2:
The intake of a privately owned 18" drainage culvert located at. the SE quadrant of the private SW 295"
Street driveway and 12"' Ave. SW is obstructed with spalls and crushed gravel. Due to the obstruction,
the culvert flow capacity is reduced and surface water could potentially flow over the roadway and into
Dr.. Sanchez's property during large storm events.
January 22, 2010
Drainage Issues at 12th Ave. SW
Page 2 of 3
City crews temporarily exposed the top of the culvert and determined that improvements are needed to
prevent collapse of the edge of driveway before the culvert intake can be left open.
Recommendation No. 3:
We recommend the installation of a Dme 1 catch basin structure at this location. Ineomin i es from
the ad' acent SW 295 h driveM and ossibly from Dr. Edwards rockery would need to be connected to
the catchbasin. The ditch from 120i Avenue SW would need to be gaded to direct flows into the catch
basin. The design should be performed by a licensed Engineer and a licable permitt= obtained.
■ Issue #3:
The conveyance capacity of the drainage channel located between Dr. Sanchez's and Mr. Townsend's
parcels is reduced due to the presence of tree roots, accumulated sediment, woody debris and concrete
rubble. We have observed that the obstructions are diverting flows into Dr. Sanchez's yard and over the
steep bluff into Puget Sound.
Recommendation No. 4:
We recommend that the p==owners either clean their res ective ortions of the conv ance ditch
to restore flew coactcoacity to a reasonable level or install a 12" minimum diameter piRe to the edge of
bluff. If the option to clean the ditch is selected we recommend that a minimum d th of 15" be
rovided. Note that the lack of ditch conve ante ca act a ears to be contributing to the instabili
of the adjacent steqp bluff.
• Issue #4:
Based on limited inspection by city staff; the existing twin 6" diameter corrugated plastic piped
conveyance over the steep bluff into Puget Sound appears not to be performing satisfactorily due to the
lack of an adequate intake structure, inadequate pipe anchors, slope instability, and intermittent impacts
from falling woody debris. This failing system is contributing to the instability of the bluff.
Recommendation No. 5:
We recommend that the roe owners re air or re lace the existing s stem. The cjV is willin to
rovide limited technical engineenn and ermittin ex eriise. Note that installation of draina e pipes
of 8" or larger diameter requires en meering and performance of the SEPA pLocess. The work mi ht
also re uire other a p rovals due to the Shoreline Mana ement Act and work location within a critical
slo e.
• Issue #5:
It has been _indicated that there has been unpermitted clearing and grading activity on the Townsend
property and diversion of flows from the Townsend property to the 12'' Avenue SW corridor. City
Code Compliance staff recently investigated these matters to determine that there was not sufficient
evidence to process a violation.
Recommendation No. 6:
We recommend that Mr.
to
minor ditching work to direct runoff from his progjU to flow northerly along what appears to be
historic draina a course through his prpperty and over the bluff into hi et Sound.
a January22, 2010
Drainage Issues at 12th Ave. SW
Page 3 of 3
If you have any questions or need additional information, please contact me at (253) 835-2750.
Sincerely,
f/.
i illiam Appleton P.E.
Surface Water Manager
WA:jw
cc: Proj'ect/Day:File
Lee Bailey, Building Official
-Amnooe sli of se Aluenem ou seNew AuM leaapad jo Al!O eqi
-Aluo uoijeluesaidaa jeoiudea6 a se asn aol pepualui si deua slyl -81ON
3d uolalddy uaeijj!M `00LZ-S£8 (E5Z)
ApIOIn MS any ulZ I JOI suoilepuauauaooaa abeuleaa a
W p uolsinla luawaC)eueW aajeM eoelanS 'R e
Juaua:pedaa sNioM ollgnd %eM jeaapad jo Alit
069VQ096R 1 '
9VO096I i
(80 o; sum
ful1slxa all) ti
a)je ul an no add a su i
k l# u011epueW111009a
wouxun a�• gelid'
iL L
ramouxxa y }5 g1963 MS
ez
v9ZQ096ii leuueyo ol AlanlIoa}}a aaow
0
961 rt aP'��P s8�aq�i6�" ;' �`ouna �anlp o} waaq
aSil � 3leydse bullslxe Aj!poW
Z# uol}epuawwooaa
ra }
6• ,r lauuego woai slagep pue _
sluawlpas palelnwnooe anowaa:•�
E# uol;epuawwooaa
i R r
Vle
w3D096TI '"y[•�.. T'7`• ' ir� •r•d' r�l
:phi-r,��'••�-•�+�'�T�f. '."If;l `r -
_ " y r 09BT'T �'*•.-IG�i6�0i�g�1.
r�
' 0961 T
47.
}4nlq umop puny
Aanuoo of edld IILIsul
�# uol;epuawwooaa 001,910
ec0 96T i �E.�ZD098TT
F`Y=4-u- Iifd-lId7
ABBREVIATIONS
ACP
Asphaltic Concrete Pavement
ADD'L
Additional
AD
Area Drain
ADJ
Adjacent
ANSI
American National Standards Institute
APPROX
Approximate(ly)
ARCH
Architect(ural)
ASSY
Assembly
BLDG
Building
BM
Benchmark
BNDRY
Boundary
BVC
Beginning of Vertical Curve
C
Cable TV
C&G
Curb and Gutter
CB
Catch Basin
CC
Concrete Curb
CD
Concrete Drive
CF
Cubic Feet (Foot)
CI
Cast Iron
CJ
Construction Joint
CL
Class
CL or
Center Line
CMP
Corrugated Metal Pipe
CONC
Concrete
CONST
Construction
CPEP
Corrugated Polyethylene Pipe
CTR
Center(ed)
CY
Cubic Yard
DCVA
Double Check Valve Assembly
DDCV
Double Detector Check Valve
DEPT
Department
DET
Detail
DI
Ductile Iron
DIA (0)
Diameter
DIM
Dimension
DS
Down Spout
DWG
Drawing
E
East(ing)
EC
Electrical Conduit
ECC
Extruded Concrete Curb
ELEV
Elevation
EOP
Edge of Pavement
LEGEND
STORM PIPE
CATCH BASIN
STORM MANHOLE
SANITARY SEWER PIPE
SANITARY SEWER MANHOLE
WATER MAINS
FIRE HYDRANT AND FDC
WATER METERS
WATER VALVES
FITTINGS WITH THRUST BLOCKS
SURFACE WTR AND PIPE DIRECTION FLOW
EXISTING CONTOUR LABELS
PROPOSED CONTOUR LABELS
GROUND SPOT ELEVATIONS (TENTHS)
A MTAT 'rA T 3
A M hK C707M
w/
With
N
North(ing)
WT
Weight
NO ( #)
Number
WWF
Welded Wire Fabric
OC
On Center
YD
Yard Drain
O/W
Oil Water
EQUIV
Equivalent
P
Power
EVC
End of Vertical Curve
PC
Point of Curvature
EXIST
Existing
PIV
Post Indicator Valve
FD
Floor Drain
PP
Power Pole
FDC
Fire Department Connection
PL or R
Property Line
FDN
Foundation
PSF
Pounds Per Square Foot
FFE
Finish Floor Elevation
PSI
Pounds Per Square Inch
FH
Fire Hydrant
PT
Point of Tangency
FL
Flanged
PVC
Polyvinyl Chloride
FLR
Floor
PVI
Point of Vertical Inflection
FOC
Face of Curb
QTY
Quantity
FS
Finished Surface
RAD (R)
Radius
FT (')
Foot (feet)
RCP
Reinforced Concrete Pipe
FTG
Footing
RD
Road
G
Gas Main
REF
Reference
GB
Grade Break
READ
Required
GRD
Grade
RET
Retaining
GV
Gate Valve
ROW
Right of Way
HB
Hose Bibb
SHT
Sheet
HDPE
High Density Polyethylene
SIM
Similar
HQRIZ(H)
Horizontal
SPEC
Specification(s)
HT
Height
STA
Station
HYD
Hydrant
SQ
Square
ID
Inside Diameter
SS
Sanitary Sewer
IE
invert Elevation
SD
Storm Drain
IN ()
Inch(es)
STD
Standard
INV
Invert
TOE
Toe of Wall, or Slope
IRR
Irrigation Water
T
Telephone Wire
LB
Pound(s)
TC
Telephone Conduit
LCPE
Lined Corrugated Polyethylene Pipe
TOC
Top of Curb
LF
Linear Feet
TG
Top of Grate
MAT'L
Material
TEMP
Temporary
MAX
Maximum
TOP
Top of Wall, or Slope
MFR
Manufactur
TV
Television Wire
MH
Matte
TYP
Typical
MJ
Mechanical Joint
VC
Vertical Curve
MIN
Minimum
VERT (V)
Vertical
MISC
Miscellaneous
WM
Water Meter
OD
OR
O
C
w
w
y�p
•n G
.il
CI
- (457)-
t 756.5
FINISHED SURFACE ELEVATIONS (HUNDREDTHS) + 756.75
N 1000.00
COORDINATES, & LEADERS E 5000.00
756.5
756.55
F S.
TOP OF WALL/TOE OF WALL
TOP AND TOE OF SLOPES
SLOPE INDICATORS
RIP RAP
FILTER FABRIC FENCING
RAIN WATER LEADERS (RWL)
CLEANOUTS (C.O.) SS, AND RWL
INTERCEPTOR AND BIO—SWALES
CEMENT CONCRETE
STUBBED & PLUGGED ;-:NE
EXTRUDED CONC. C�;4B
CURB & GUTTER
ASPHALT CONCRETE PAVEMENT
SHORING WALL
ROCKERY WALL
CONCRETE RETAINING ','TALL
2s6. s
292.0
0
X X
a�
CONSTRUCTION SEQUENCE
1. FLAG CLEARING LIMITS AS SHOWN.
2. SEWER LOCATION SHALL BE FIELD VERIFIED PRIOR TO ANY CONSTRUCTION: DIG (POTHOLE)
EACH LOCATION TO PHYSICALLY VERIFY DEPTH AND ESTABLISH PROPER SEPERATION.
3. INSTALL TEMPORARY QUARRY ROCK CONSTRUCTION ENTRANCE.
4. INSTALL FILTER FENCE. CLEAR AND GRUB SITE. INSTALL TEMPORARY INTERCEPTOR
DITCHES AS CONSTRUCTION ACTIVITIES PROGRESS. ADDITIONAL FILTER FENCE MAY
BE REQUIRED AROUND THE PERIMETER TO PREVENT SILT LADEN WATER FROM
LEAVING THE SITE.
5. ANY AREA STRIPPED OF VEGETATION, WHERE NO FURTHER WORK IS ANTICIPATED FOR A
PERIOD OF 15 DAYS, SHALL BE IMMEDIATELY STABILIZED WITH THE APPROVED EROSION &
SEDIMENT CONTROL METHODS, (E.G., SEEDING, MULCHING. NETTING, EROSION & SEDIMENT
CONTROL METHODS.)
6. ROUGH GRADE SITE.
7. EROSION CONTROL INSPECTION WILL OCCUR AT TIME OF FOOTING INSPECTION
8. CONSTRUCT HOUSE, DRIVEWAY, UTILITIES AND STORM DRAINAGE SYSTEM.
9. CALL FOR SITE DRAINAGE INSPECTION.
10. HYDROSEED AND MULCH/LANDSCAPE ALL EXPOSED AREAS.
11. CALL FOR FINAL SITE INSPECTION.
12. REMOVE TEMPORARY EROSION CONTROL FACILITIES, ONLY, AFTER ENTIRE SITE IS STABILIZED
AND THE POTENTIAL FOR EROSION HAS PASSED.
13. CLEAN ANY SILT THAT HAS ACCUMULATED IN THE PERMANENT STORM DRAINAGE SYSTEM,
BENCHMARK AND DATUM
BENCH MARK:
ASSUMED DATUM PROVIDED BY SURVEYOR OF RECORD
LEGAL DESCRIPTION
BUENNA ADD LOTS 17 THRU 20 LESS W 10 FT OF LOT 20 TGW S
1/2 VAC SW 295TH ST ADJ -- AKA LOT B KC LLA #885070 TGW
SD LOT 16 & VAC ST ADJ
NEW IMPERVIOUS SURFACES
DRIVEAY & PARKING AREAS 3,473 S.F.
DWELLING & GARAGE ROOFS 3,824 S.F.
TOTAL PROPOSED 7,297 S.F.
CONTRACTOR NOTE
ALL EXISTING UTILITIES SHOWN ON PLANS ARE TO BE VERIFIED HORIZONTALLY AND
VERTICALLY PRIOR TO ANY CONSTRUCTION. ALL EXISTING FEATURES INCLUDING BURIED
UTILITIES ARE SHOWN AS INDICATED ON RECORD MAPS AND SURVEY FURNISHED BY
OTHERS. WE ASSUME NO LIABILITY FOR THE ACCURACY OF THOSE RECORDS AND
SURVEY, FOR THE FINAL LOCATION OF EXISTING UTILITIES IN AREAS CRITICAL TO
CONSTRUCTION CONTACT THE UTILITY OWNER/AGENCY.
VICINITY
No, TO :oa.c O.N✓
OWNER /DEVELOPER
RICK ELDER
29410 - 157TH AVENUE SE
KENT, WASHINGTON 98042
ARCHITECT
ARCHITECTS NORTHWEST, INC.
18915 - 142ND AVENUE NE, SUITE 100
WOODINVILLE, WA 98072
(425) 485-4900
FAX (425) 487-6585
SHEET INDEX
CIVIL ENGINEER
GEORESOURCES, LLC
5007 PACIFIC HWY EAST SUITE 16
FIFE, WASHINGTON 98424
(253) 896-1011
FAX (253) 896-2633
SURVEYOR
SADLER BARNARD & ASSOCIATES
31218 PACIFIC HWY. S
FEDERAL WAY, WASHINGTON 98003
(253) 941-1599
TITLE SHEET & VICINITY MAP ......................................................... C-0
GRADING & DRAINAGE PLAN.......................................................... - C 1
GENERAL NOTES & DETAILS........................................................... C-2
GENERAL NOTES & DETAILS........................................................... C-3
SITE ADDRESS
XXX — 12TH AVENUE SW
PARCEL NUMBER 1196004690
M D
CONSTRUCTION SEQUENCE
1. FLAG CLEARING LIMITS AS SHOWN.
2. SEWER LOCATION SHALL BE FIELD VERIFIED PRIOR TO ANY CONSTRUCTION: DIG (POTHOLE)
EACH LOCATION TO PHYSICALLY VERIFY DEPTH AND ESTABLISH PROPER SEPERATION.
3. INSTALL TEMPORARY QUARRY ROCK CONSTRUCTION ENTRANCE.
4. INSTALL FILTER FENCE. CLEAR AND GRUB SITE. INSTALL TEMPORARY INTERCEPTOR
DITCHES AS CONSTRUCTION ACTIVITIES PROGRESS. ADDITIONAL FILTER FENCE MAY
BE REQUIRED AROUND THE PERIMETER TO PREVENT SILT LADEN WATER FROM
LEAVING THE SITE.
5. ANY AREA STRIPPED OF VEGETATION, WHERE NO FURTHER WORK IS ANTICIPATED FOR A
PERIOD OF 15 DAYS, SHALL BE IMMEDIATELY STABILIZED WITH THE APPROVED EROSION &
SEDIMENT CONTROL METHODS, (E.G., SEEDING, MULCHING. NETTING, EROSION & SEDIMENT
CONTROL METHODS.)
6. ROUGH GRADE SITE.
7. EROSION CONTROL INSPECTION WILL OCCUR AT TIME OF FOOTING INSPECTION
8. CONSTRUCT HOUSE, DRIVEWAY, UTILITIES AND STORM DRAINAGE SYSTEM.
9. CALL FOR SITE DRAINAGE INSPECTION.
10. HYDROSEED AND MULCH/LANDSCAPE ALL EXPOSED AREAS.
11. CALL FOR FINAL SITE INSPECTION.
12. REMOVE TEMPORARY EROSION CONTROL FACILITIES, ONLY, AFTER ENTIRE SITE IS STABILIZED
AND THE POTENTIAL FOR EROSION HAS PASSED.
13. CLEAN ANY SILT THAT HAS ACCUMULATED IN THE PERMANENT STORM DRAINAGE SYSTEM,
BENCHMARK AND DATUM
BENCH MARK:
ASSUMED DATUM PROVIDED BY SURVEYOR OF RECORD
LEGAL DESCRIPTION
BUENNA ADD LOTS 17 THRU 20 LESS W 10 FT OF LOT 20 TGW S
1/2 VAC SW 295TH ST ADJ -- AKA LOT B KC LLA #885070 TGW
SD LOT 16 & VAC ST ADJ
NEW IMPERVIOUS SURFACES
DRIVEAY & PARKING AREAS 3,473 S.F.
DWELLING & GARAGE ROOFS 3,824 S.F.
TOTAL PROPOSED 7,297 S.F.
CONTRACTOR NOTE
ALL EXISTING UTILITIES SHOWN ON PLANS ARE TO BE VERIFIED HORIZONTALLY AND
VERTICALLY PRIOR TO ANY CONSTRUCTION. ALL EXISTING FEATURES INCLUDING BURIED
UTILITIES ARE SHOWN AS INDICATED ON RECORD MAPS AND SURVEY FURNISHED BY
OTHERS. WE ASSUME NO LIABILITY FOR THE ACCURACY OF THOSE RECORDS AND
SURVEY, FOR THE FINAL LOCATION OF EXISTING UTILITIES IN AREAS CRITICAL TO
CONSTRUCTION CONTACT THE UTILITY OWNER/AGENCY.
VICINITY
No, TO :oa.c O.N✓
OWNER /DEVELOPER
RICK ELDER
29410 - 157TH AVENUE SE
KENT, WASHINGTON 98042
ARCHITECT
ARCHITECTS NORTHWEST, INC.
18915 - 142ND AVENUE NE, SUITE 100
WOODINVILLE, WA 98072
(425) 485-4900
FAX (425) 487-6585
SHEET INDEX
CIVIL ENGINEER
GEORESOURCES, LLC
5007 PACIFIC HWY EAST SUITE 16
FIFE, WASHINGTON 98424
(253) 896-1011
FAX (253) 896-2633
SURVEYOR
SADLER BARNARD & ASSOCIATES
31218 PACIFIC HWY. S
FEDERAL WAY, WASHINGTON 98003
(253) 941-1599
TITLE SHEET & VICINITY MAP ......................................................... C-0
GRADING & DRAINAGE PLAN.......................................................... - C 1
GENERAL NOTES & DETAILS........................................................... C-2
GENERAL NOTES & DETAILS........................................................... C-3
SITE ADDRESS
XXX — 12TH AVENUE SW
PARCEL NUMBER 1196004690
M D
M ;�Q' .M
P'
C
W 0
RESUBMITTE
n C4
EL 0
� U (D
CITY OF FEDERAL WAY
"' N CD
CDS_
n(1)D
CO
SHEET N
M 3 � T
V
C
L
1W
G
i G I a I �F
EXISTING DRAINA,G�_SWALE
B L 0 CJ� 24 \\ \ \ \ \ \ ,` - C_2 SILT FENCE. ---/
PARCEL �10. \\ \\ \\ -- 11
B l � N N A \ -,ROCK PROTECTION\OUTFALL PER 2009 KCSWQ-F1f>.
�" 119 6 0 �4 6 5 \ \ 4.2-2.A & TABLE 4.2.2:�,\ROCK LINING 7'X8'X1' Rock - - -� x
\ \ lii� shall be quarry-sp4La-- with gradation as 6 O O
follows: I \
C 3
\Rassing 8-inch square sieve: 1di7'ro- I x
Passing 3-inch squ -e, sieve: 40 to 60� maximum - , 1
Passh' g\3/4-inch square` -sieve;_ 0 to 10% maximum
/ \ PAD RESTING ON MIRAFI-i4$N-FA-$RIC 1
\\ I.E. 149.0 (MATCH EG)--- I
60
E
\�\ S89°01'25"E ( �N
-�'�' co CC'
CONNECT TO TYPE 1� CB WITH \ \ 100.00
\\ SOLID, LID ``�� �� ( z�!`
5 RIM 15"ATCH EG) in o I
\ I C-3 I.E. 152.96 CONNECT TO TYPE 1 OD <
10' STORM, 5 -CB WITH SOLID LID I �,
/ \ \\EASEMENT, \ \ RIM 1 6� - IATCH EG
�V.ERIFY
-J
JTI�I�'I� EASEMENT _-___-_-\\ 0
/ I ® „� 98 LF - 8" ADS N12 @ 1 % (MIN) I \
8 S '7.. 8"SD® 81ISD- 8"SD 8"SD 8"SD-._e. 8 SD� &SD- 8"SD-- WSD I
-7------- I -y-I---------\--------------------------- \�-- -- -_�
8 PVC Sewer I - / _ \--------- -
/ S °° / S ' SEWER EASEMENT \\\
/S
-------- I ' I / \
-I-7 �- ------ - - - - - - - - - - - - - - - - t------- EXISTING OD
10 SEWER
EASEMENT I/ STORM TO PASS ABOVE SEWER - I
/(PREFERRED) AT THIS / / -
/ INTERSECTION; MIN. 1 FOOT
/ 1 / SEPARATION - FIELD VEf3J Y-
/ PRIOR TO INSTALLAT)OK OF
/ I SEDIMENT CONTR01/ STRUCTURE
10 STORM
EASEME(gT
VERIFYIn
0 1 PA R C E L //N 0. LL;
19-002475
000 \ N� w Ln
0 00
Ln
0 00
I I
\ U 0 q 1 z II I /SEWER LOCATION S L BE FIJLD
� (0 i I I i VERIFIED PRIOR TO ANY
I Q 0-) I I I CONSTRUCTION�DIG (POTHOLE)
I 7---- Ij I I 1 EACH 'LOCATION TO PHYSICALLY
i/ 4 VERIFY DEPTg AND EST4LISH
PROPER SEPARATION.-
/
/Li60
-
/ 2FI
10 STORM
\ z° i EASEMENT
\ I Wbo
/ I VERIFY / I I i I I 125" MAPLE I
\� I (n
\\ \\ \\ \\ \ \ \ \ 10,
ft
00
/ I / STORM TO PASS ABOVE SEWER
(PREFERRED) AT THIS a
INTERSECTION; MIN. "1 FOOT
/ SEPARATION - FIELD VERIFY
/ I / PRIOR TO INSTALLXTION OF
SEDIMENT WNTROt STRUCTURE
STING/ I ?)
/ I / d GAS STUB
' I / / I
»»> «« MATCH LINE �»» << 0 GAS /STUB /
10' STAR M ---- 1 - ---------- ----8„ _P-VC -Sewer- Line----------- �!-----------------,---.,---------
,EASEMENT
�i S I
-�--- '
p
EXISTIN/
EOP
-----�--------------- �-- ----- ___ /10' STORM- .
S `---
SEASEMENT�''
139.36'
S89 z1'25IE
CONC YAR6 DRAT
--------`Wf11IN-GRA
/RIM 160.0
LE 15 .0
TE MAIN p
CU�O�f TMKENL-D-
DGf IAS FLOW DIRECTION
/ CONTROL
12"BADS
APPROXIMATE LOCATIO
/ OF FILTER FA <1 i
/ FENCE. UAL N...
LOCATION TO BE \i TYPE I C$ AS SEDIMET
DETER IKED IN THE X 000ROL STRUCTURE"` 16
FIELD AS +f20 RATED ,RWr 163.7
2/ CONSTRUCTION I.E. 159.
� i 1 i �_ $ �
C7 PROGRESSES,,,
i11 2'H' STB WALL 11�
/ �T=166.00
/X
/ SUBJECT PR'OPERT
JBdNDARY IS CONSTRUCTIO / / // zo
LIMITS, O'CLEARING 0
GRADING ,BEYOND PROPE
/LIN /X / / 175.69
CANT'L /
DECK o
' w d
/ / t
/ L0 r
�/X CONNECT ROOF
D/S/TO 4" SOLID °
PVC (TYP)
Z /
TYPE 1 CB
W/ GRATE
RIM=173.7
IE =169.0 -
,,�\l Y2&5
a o
O
A
A
A
n
A / !�
/ 00
u7
/� O
O
A
cn
1�2
X /
/
C- 3171
I 176 / 186 3'fYPE 1 CB
I 1
wGRATE
-17 - x �`� / : R M =184.6
I I X /
° N
-777
182 GARAGE
I I 10 o
4'H STB WALL
i I co
184 T=190.00
B=186..90
If �H.. STB WALL
X/3T=190.00
- - - - --- - /-
I 185.84 185.84�p
/
/ C] /
—
/ 1 �
2_ -
YP CM AXi
41y ROCKERY DR 21{• IvT 198
I%
1
\
\
6 I 7 I
/,
_SEDIME9T`GQtItTROL�1ICT1J4E — �__ — �- — �- EOP7
' J GAS STUB
»»> i
�«« MATCH LINE /->»» «« 0 GAS /STUB
----------- -Se+rrer-t-rrre----------------------------
��-
S�- C,J------ \-----------------
/ 115'0' / EOP-"
/
PROVIDE POSITIVE FLOW FROM / APPROXIMATE LOCATIO' CONSTRUCTION ENT AOF
NCE 1 /
//UPPER TO LOWER /ELVERTS / ACTUAL LOCATION t BE C
/ ETERMINED IN THE Fl LD AS /
ll VAC. S'IN 295 TH S TR�,E CONSTRUCTION PROG/ ESSES. /
/ '/ (PRIVATE RO D SPHALT /
4 WATER MAIN /
— W — — — -/-- — ____ _ SERVE AN.D
EXISTING EC/) I — PR'OTECT EXISTING /
U1fILITY ASSETS.1, N12 /
_ - "R� X�"
_ I-
- 2 CM EXTEND-
�-
►- s"so - (0
�
C
/
1
C-3 I
/ 172
6 SD"`---� s'SD
T �I
/
X
I
-3 H STB WALL
/
// I V i I V
-
_
s'SD69 0
R VAULT
0 DRIVEWAY
B-164.00 --""��°$ --
- - -
CF _ 6�" /
S-- z _ �„
/
FRONT SETBA
-
D
HSTB WALL__-----
.-----"T
1 7 OO
2H:-1� TYPE
YARD - --6'
-Q 175.69 2 " COVER (MIN)
cn I
1-1
-4"SD 4"SD—,_
4
ROOF
LINES
/
CONNECT ROOF GRAINS
CONVEYANCEXRAINAGE
SYSTEM /
BLDG
WALL
,LINES rRESIDEN(�E
RIDGE=201.17
MAIN=186.50
LOWER=176.37
/ ENTRY
/ PORCH
/ Q 186.50
'ARCED NO
'1196004690 :P
0
/
175.70 1 A
ROCKERY
T=178.20
B=175.70 in
°
184.00
/
4"SD 4"SD
/
/
TO CB - - /-----91
-
/ 00
ocr
1g2
N 89 0�- 2-5 W 115.�= - - - - GRAPHIC SCALE
tig� 1g6 �C' Z00 /
10 0 5 10
CALL 48 HOURS BEFORE YOU DIG N
1- 800- 424- 5555 FEET )
1 inch
= 10 ft.
o N
w V
ax
e
� �
U
U
� L
0T
1
� '
C14 f t
m00
•
v I��Jgq1
o
'
wry
V
Q
Ld
QLIS
C:)L-
Lor-
V)
o
0
w
N
\
<
CY)
u.
N
Y
co
M
co
Of
W
>
a
O
d
-0
o
a
W
3
0
Q
1
0
o0:�
o
o
V)
LLJ
(na
Z
w
3,0
W
Z
®
Z
®
W
Q
AO Aft
:>
Q
3:
W
N
W
1
JY`
W
RESUBMITTED
SEP
0 8
2011
Uj
o CITY
�
OF FEDERAL WAY
p
SHEET TITLE:
Cn
w
SHEET NO.
-I N
W
0
w
CIVIL
12TH AVENUE SW
DRAINAGE
PLAN
SECTION , TOWNSHIP NORTH, RANGE EAST, W.M.
v
1:3
C
❑R
C
F
G
2
SEEDING MOTES
R
1. SEEDING MIXTURE SHALL BE GRASS SEED AND SHALL BE APPLIED AT A RATE OF 1LB PER 1000SQFT.
2. SEED BEDS PLANTED BETWEEN MAY 1 AND OCTOBER 31 WILL REQUIRE IRRIGATION AND OTHER MAINTENANCE AS
NECESSARY TO FOSTER AND PROTECT ROOT STRUCTURE.
3. FOR SEED BEDS PLANTED BETWEEN OCTOBER 31 AND APRIL 30, ARMORING OF SEED BEDS WILL BE NECESSARY
(E.G., GEOTEXTILES, JUTE MAT, CLEAR PLASTIC COVERING).
4. BEFORE SEEDING, INSTALL NEEDED SURFACE RUNOFF CONTROL MEASURES SUCH AS GRADIENT TERRACES,
INTERCEPTOR DIKES, SWALES, LEVEL SPREADERS, AND SEDIMENT BASINS.
5, THE SEED BEDS SHALL BE FIRM WITH A FAIRLY FINE SURFACE, FOLLOWING SURFACE ROUGHENING. PERFORM ALL
OPERATIONS ACROSS OR AT RIGHT ANGLES TO THE SLOPE,
6. FERTILIZERS ARE TO BE USED ACCORDING TO SUPPLIERS RECOMMENDATIONS. AMOUNTS USED SHOULD BE MINIMIZED,
ESPECIALLY ADJACENT TO WATER BODIES AND WETLANDS.
GRADING NOTES
1, CUT SLOPES < 2 HORIZONTAL TO 1 VERTICAL OR AS RECOMMENDED BY A SOILS ENGINEER. (17A.30.010.A.1)
2. THE CATCH POINT OF THE TOP OF THE SLOPE SET BACK FROM THE BOUNDARY LINE PER THE TABLE;
(17A.30.010.A.2) (17A.30.010.B)
CUT DEPTH SETBACK DISTANCE
< 5' 2'
5' - 20 HEIGHT/2
>20' 10'
FILL
3. FILL SLOPES NOT STEEPER THAN 1 16 HORIZONTAL TO 1 VERTICAL OR AS RECOMMENDED BY A SOILS
ENGINEER. (17A.30.010.B)
4. GROUND SURFACE FOR FILLS OVER 5' IN HEIGHT PREPARED BY REMOVING VEGETATION, NONCOMPLYING FILL,
TOPSOIL AND OTHER UNSUITABLE MATERIALS AND SCARIFYING. (17A.30.010.C)
5. GROUND SURFACE FOR FILLS WHERE EXISTING SLOPES ARE > 5 HORIZONTAL TO 1 VERTICAL PREPARED BY
BENCHING INTO COMPETENT MATERIAL. THE BENCH IS AT LEAST 10' WIDE OR AS RECOMMENDED BY A
SOILS ENGINEER. (17A.30.010.C)
6. NO MATERIAL OTHER THAN EARTH MATERIAL BURIED OR PLACED IN FILLS. (17A.30.010.D)
7. THE TOE OR CATCH POINT OF FILL SLOPES SET BACK FROM THE SITE BOUNDARY LINE IN ACCORDANCE WITH
THE FOLLOWING TABLE, UNLESS A RETAINING WALLS IS DESIGNED BY AN ENGINEER AND CONSTRUCTED FOR
THIS PROJECT; (17A.30.010.F)
FILL DEPTH SETBACK DISTANCE
< 5' 2'
5' - 40' HEIGHT/2
> 40' 20'
AS PER KING COUNTY ROAD STANDARD,
DRIVEWAYS SHALL BE PAVED TO THE
EDGE OF R-O-W PRIOR TO INSTALLATION
OF THE CONSTRUCTION ENTRANCE TO
AVOID DAMAGING OF THE ROADWAY,
IT IS RECOMMENDED THAT THE ENTRANCE
BE CROWNED SO THAT RUNOFF DRAINS
OFF THE PAD.
INSTALL DRIVEWAY CULVER'
IS A ROADSIDE DITCF
4"-
CONSTRUCTION ENTRANCE
�XI5T�NG ROAD
,0
DRAINAGE NOTES:
1, PROOF OF LIABILITY INSURANCE SHALL BE SUBMITTED TO DDES PRIOR TO THE PRECONSTRUCTION MEETING
(KCC 9.04.100.D).
2. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION IN ACCORDANCE
WITH WSDOT 7-02.3(1). THIS SHALL INCLUDE LEVELING AND COMPACTING THE TRENCH BOTTOM, THE TOP OF
THE FOUNDATION MATERIAL, AND ANY REQUIRED PIPE BEDDING, TO A UNIFORM GRADE SO THAT THE ENTIRE
PIPE IS SUPPORTED BY A UNIFORMLY DENSE UNYIELDING BASE.
3. STEEL PIPE SHALL BE GALVANIZED AND HAVE ASPHALT TREATMENT #1 OR BETTER INSIDE AND OUTSIDE
(KCRS 7.03).
4. ALL DRAINAGE STRUCTURES, SUCH AS CATCH BASINS AND MANHOLES, NOT LOCATED WITHIN A TRAVELED
ROADWAY OR SIDEWALK, SHALL HAVE SOLID LOCKING LIDS. ALL DRAINAGE SURTAXES ASSOCIATED WITH A
PERMANENT RETENTION/DETENTION FACILITY SHALL HAVE SOIL LOCKING LIDS (KCRS 7.05).
5. ALL CATCH BASINS SHALL CONFORM TO KCRS DRAWING NUMBERS 2-013, 2-018, 2-019, OR 2-020, WHICH
INCLUDED THE STAMPING "OUTFALL TO STREAM, DUMP NO POLLUTANTS" AND "PROPERTY OF KING COUNTY"
(KCRS 7.05).
6. ALL DRIVEWAY CULVERTS LOCATED WITHIN KING COUNTY RIGHT-OF-WAY SHALL BE SUFFICIENT LENGTH TO
PROVIDE A MINIMUM 3:1 SLOPE FROM THE EDGE OF THE DRIVEWAY TO THE BOTTOM OF THE DITCH.
CULVERTS SHALL HAVE BEVELED END SECTIONS TO MATCH THE SIDE SLOPE (KCRS 7.03(L), DRAWING NO.
2-001).
7. ROCK FOR EROSION PROTECTION OF ROADWAY DITCHES, WHERE REQUIRED, MUST BE OF SOUND QUARRY
ROCK, PLACED TO A DEPTH OF 1 FOOT, AND MUST MEET THE FOLLOWING SPECIFICATIONS: 4" -
8"/40%-70% PASSING; 2" - 4" ROCK/30%-40% PASSING; AND 2" ROCK/10%-20% PASSING. INSTALLATION
SHALL BE IN ACCORDANCE WITH KCRS 7.02(B), DRAWING NO. 2-024.
8. DRAINAGE OUTLETS (STUB -OUTS) SHALL BE PROVIDED FOR EACH INDIVIDUAL LOT, EXCEPT FOR THOSE LOTS
APPROVED FOR INFILTRATION BY KING COUNTY. STUB -OUTS SHALL CONFORM TO THE FOLLOWING:
EACH OUTLET SHALL BE SUITABLY LOCATED AT THE LOWEST ELEVATION ON
THE LOT, SO AS TO SERVICE ALL FUTURE ROOF DOWNSPOUTS AND FOOTING
DRAINS, DRIVEWAYS, YARD DRAINS, AND ANY OTHER SURFACE OR SUBSURFACE
DRAINS NECESSARY TO RENDER THE LOTS SUITABLE FOR THEIR INTENDED USE.
EACH OUTLET SHALL HAVE FREE -FLOWING, POSITIVE DRAINAGE TO AN APPROVED
STORMWATER CONVEYANCE SYSTEM OR TO AN APPROVED OUTFALL LOCATION,
OUTLETS ON EACH LOT SHALL BE LOCATED WITH A FIVE -FOOT -HIGH, 2" X 4"
STAKE MARKED "STORM" OR "DRAIN". THE STUB -OUT SHALL EXTEND ABOVE
SURFACE LEVEL, BE VISIBLE, AND BE SECURED TO THE STAKE.
PIPE MATERIAL SHALL CONFORM TO UNDERDRAIN SPECIFICATIONS DESCRIBED IN KCRS 7.04 AND, IF
NON-METALLIC, THE PIPE SHALL CONTAIN WIRE OR OTHER ACCEPTABLE DETECTION.
DRAINAGE EASEMENTS ARE REQUIRED FOR DRAINAGE SYSTEMS DESIGNED TO CONVEY FLOWS THROUGH
INDIVIDUAL LOTS.
THE APPLICANT/CONTRACTOR IS RESPONSIBLE FOR COORDINATING THE LOCATIONS OF ALL STUB -OUT
CONVEYANCE LINES WITH RESPECT TO THE UTILITIES (E.G. POWER, GAS, TELEPHONE, TELEVISION)
ALL INDIVIDUAL STUB -OUTS SHALL BE PRIVATELY OWNED AND MAINTAINED BY THE LOT OWNER.
I I-Ill.t\IVCJJ
PROVIDE FULL WIDTH
INGRESS/EGRESS AREA
MULCHING NOTES
1. MULCH MATERIALS USED SHALL BE STRAW AND SHALL BE APPLIED AT A RATE OF
100LBS PER 1000SQFT.
2. MULCHING SHALL BE APPLIED IN ALL AREAS WITH EXPOSED SLOPES GREATER THAN
2:1.
3. MULCHING SHALL BE USED IMMEDIATELY AFTER SEEDING OR IN AREAS WHICH
CANNOT BE SEEDED BECAUSE OF THE SEASON.
4. ALL AREAS NEEDING MULCH SHALL BE COVERED BY NOVEMBER 1.
MAINTENANCE STANDARDS
1. QUARRY SPALLS (OR HOG FUEL) SHALL BE ADDED IF THE PAD IS NO LONGER IN
ACCORDANCE WITH THE SPECIFICATIONS.
2. IF THE ENTRANCE IS NOT PREVENTING SEDIMENT FROM BEING TRACKED ONTO PAVEMENT,
THEN ALTERNATIVE MEASURES TO KEEP THE STREETS FREE OF SEDIMENT SHALL BE USED.
THIS MAY INCLUDE STREET SWEEPING, AN INCREASE IN THE DIMENSIONS OF THE ENTRANCE,
OR THE INSTALLATION OF A WHEEL WASH. IF WASHING IS USED, IT SHALL BE DONE ON AN
AREA COVERED WITH CRUSHED ROCK, AND WASH WATER SHALL DRAIN TO A SEDIMENT TRAP
OR POND.
3. ANY SEDIMENT THAT IS TRACKED ONTO PAVEMENT SHALL BE REMOVED IMMEDIATELY BY
SWEEPING. THE SEDIMENT COLLECTED BY SWEEPING SHALL BE REMOVED OR STABILIZED
ON -SITE. THE PAVEMENT SHALL NOT BE CLEANED BY WASHING DOWN THE STREET, EXCEPT
WHEN SWEEPING IN INEFFECTIVE AND THERE IS A THREAT TO PUBLIC SAFETY. IF IT IS
NECESSARY TO WASH THE STREET, THE CONSTRUCTION OF A SMALL SUMP SHALL BE
CONSIDERED. THE SEDIMENT WOULD THEN BE WASHED INTO THE SUMP.
4. ANY ROCK SPALLS THAT ARE LOOSENED FROM THE PAD AND END UP ON THE ROADWAY
SHALL BE REMOVED IMMEDIATELY.
5. IF VEHICLES ARE ENTERING OR EX EXITING THE SITE AT POINTS OTHER THAN THE
CONSTRUCTION ENTRANCE(S), FENCING (SECTION 5.4.1) SHALL BE INSTALLED TO CONTROL
TRAFFIC.
SCALE : NTS
5
m
SILT FENCE NOTES
1. FILTER FABRIC SHALL BE PURCHASED IN A CONTINUOUS ROLL AND CUT TO THE LENGTH
OF THE BARRIER TO AVOID USE OF JOINTS. WHEN JOINTS ARE NECESSARY, FILTER
CLOTH SHALL BE SPLICED TOGETHER ONLY AT A SUPPORT POST, WITH A MINIMUM 6"
OVERLAP, AND SECURELY FASTENED ON BOTH ENDS TO POST.
2. POSTS SHALL BE A MAXIMUM OF 6' APART AND DRIVEN SECURELY INTO THE GROUND
(MINIMUM OF 30-),
3. A TRENCH SHALL BE EXCAVATED APPROXIMATELY 8" WIDE AND 12" DEEP ALONG THE
LINE OF POSTS AND UPSLOPE FROM THE BARRIER, THIS TRENCH SHALL BE BACKFILLED
WITH WASHED GRAVEL.
4. WHEN STANDARD STRENGTH FILTER FABRIC IS USED, A WIRE MESH SUPPORT FENCE
SHALL BE FASTENED SECURELY TO THE UPSLOPE SIDE OF THE POSTS USING HEAVY
DUTY WIRE STAPLES AT LEAST 1" LONG, TIE WIRES OR HOG RINGS. THE WIRE SHALL
EXTEND INTO THE TRENCH A MINIMUM OF 4" AND SHALL NOT EXTEND MORE THAN 24"
ABOVE THE ORIGINAL GROUND SURFACE.
5. THE STANDARD STRENGTH FILTER FABRIC SHALL BE STAPLED OR WIRED TO THE FENCE,
AND 20" OF THE FABRIC SHALL BE EXTENDED INTO THE TRENCH. THE FABRIC SHALL
NOT EXTEND MORE THAN 24" ABOVE THE ORIGINAL GROUND SURFACE. FILTER FABRIC
SHALL NOT BE STAPLED TO EXISTING TREES.
6. WHEN EXTRA STRENGTH FILTER FABRIC AND CLOSER POST SPACING IS USED, THE WIRE
MESH SUPPORT FENCE MAY BE ELIMINATED. IN SUCH A CASE, THE FILTER FABRIC IS
STAPLED OR WIRED DIRECTLY TO THE POST WITH ALL OTHER PROVISIONS OF ABOVE
NOTES APPLYING,
7. FILTER FABRIC FENCES SHALL NOT BE REMOVED BEFORE THE UPSLOPE AREA HAS BEEN
PERMANENTLY STABILIZED.
8. FILTER FABRIC FENCES SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND AT
LEAST DAILY DURING PROLONGED RAINFALL. ANY REQUIRED REPAIRS SHALL BE MADE
IMMEDIATELY.
9. SILT FENCES WILL BE INSTALLED PARALLEL TO ANY SLOPE CONTOURS.
10. CONTRIBUTING LENGTH TO FENCE WILL NOT BE GREATER THAN 100'.
11. DO NOT INSTALL BELOW AN OUTLET PIPE OR WEIR.
12. INSTALL DOWNSLOPE OF EXPOSED AREAS.
13. DO NOT DRIVE OVER OR FILL OVER SILT FENCES.
STOCKPILING SOIL NOTES
STOCKPILES SHALL BE STABILIZED (WITH PLASTIC COVERING OR OTHER
APPROVED DEVICE) DAILY BETWEEN OCTOBER 1 TO APRIL 30.
2. IN ANY SEASON, SEDIMENT LEACHING FROM PILES MUST BE PREVENTED.
3. TOPSOIL SHALL NOT BE PLACED WHILE IN A FROZEN OR MUDDY CONDITION, /
WHEN THE SUBGRADE IS EXCESSIVELY WET, OR WHEN CONDITIONS EXIST THAT
MAY BE OTHERWISE DETRIMENTAL TO PROPER GRADING OR PROPOSED SODDING
OR SEEDING.
4.
PREVIOUSLY ESTABLISHED GRADES ON THE AREAS TO BE TOPSOILED SHALL BE
MAINTAINED ACCORDING TO THE APPROVED PLAN.
FILTER FABRIC MATERIAL IN CONTINUOUS
ROLLS USE STAPLES OR WIRE RINGS TO
ATTACH FABRIC TO WIRE
WIRE MESH SUPPORT
FENCE FOR FILTER
FABRIC
II 1
FILTER FABRIC
MIN. 8 X12 TRENCI
---I--I-------------II_
BACKFILL TRENCH WITH
r� 6' MAX. .l f 3/4"-3" WASHED GRAVEL
AND ON BOTH SIDES OF
U FILTER FENCE FABRIC
2"X2"X5' WOOD POSTS, -
STANDARD, OR BETTER
LINE FILTER MATERIAL IN 8"X12"
TRENCH AND LEAVE MIN. 2" EXPOSED
FILTER FABRIC FENCE
CALL 48 HOURS BEFORE YOU DIG
1- 800- 424- 5555
2'
MIN.
12"
MIN.
SCALE : NTS
7
rn
oN
�I
cock
N N
-1 - U
1-1-0
mm
U-z
•
LLJ
w
� L
LIS r
>i_ 0
cwc
coF-,00
•
U
o
w
�`
¢ Q
n-
a
_
w
o �.,
n
Lo
0i
z
o
I
W
i
o
3�:
w
a
a
¢
N
_
m
m
CN
N
w
N
J
W
O
_0
o
z
3
c>
�
IL
0
0
a,
o
o
o �
W
3:
V
u)Q
Z
W3:
W
Z)
Q
..
W
Q
U)
>
<
3.0
W
(�
N
W
W
in
Q
W
�
LL-
W
X
RESUBMITTED
w
J
F-
SEP
0 8
2011
v
w
o CITY OF
_
FEDERAL
CDS
WAY
SHEET TITLE:
CIVIL
12TH AVENUE SW
GENERAL NOTES
AND DETAILS
SHEET N0.
C-2
lei
2
NOTES:
1. USE MIN. 54" DIA. CATCH BASIN TYPE II, H2O RATED AS
APPLICABLE.
2. OUTLET CAPACITY: DEVELOPED DESIGN FLOW.
3. METAL PARTS: CORROSION RESISTANT. GALVANIZED PIPE PARTS
TO HAVE ASPHALT TREATMENT 1.
4. IF METAL OUTLET PIPE CONNECTS TO CEMENT CONCRETE PIPE:
OUTLET PIPE TO HAVE SMOOTH O.D. EQUAL TO CONCRETE PIPE
I.D. LESS 1/4".
5, PROVIDE AT LEAST ONE 3"X.090 GAGE SUPPORT BRACKET
ANCHORED CONCRETE WALL (MAX. 3'-0" VERTICAL SPACING).
QUARRY SPALLS
FILTER FABRIC
NOTES:
2% (MIN)
11=III=►ii={ ({ � � � ({ {{ { (=
tt:
DRIVEWAY SECTION
12' (MIN)
CONSTRUCT SHALLOW
SCALE AS REQUIRED TO
ENTER EXISTING DITCH
GRASS FILTER STRIP LENGTH SEED W/
40% TURF TYPE RYE
40% FESCUE
10% WHITE DUTCH CLOVER
10% COLONIAL BENTGRASS
3
PROVIDE LOCKING LID
DEVICE SHALL BE
LOCATED SO THAT
80% OF OVERFLOW
PIPE IS VISABLE FROM
OPENING
N
INLET PIPE-J_
6"o
YARD DRAIN I.E.=158.5
STORM DRAIN I.E.=158.5
ROOF DRAIN I.E.=158.5 a
PIPE SUPPORTS
3"xO.09 BOLTS a
OR EMBEDDED 2" IN WALL
FINE MESH SCREEN --L
BAND TO PIPE
SEDIMENT CONTROL STRUCTURE
PER PLAN
G
161.0
SCALE NTS
EL. 163.7
TYPE I CATCH BASIN
v z
N
8 0 OUTLET PIPE
a I.E.=158.00
a
z
� N
2% (MIN)
S�0
0 1-1
2" ACP OVER FIRM UNYEILDING
7
NATIVE SUBGRADE OR 4" CSTC
CATCH BASIN AND OR AS OTHERWISE INDICATED
STORM PIPE (TYP) PER ARCHITECT
SCALE NTS
12" WIDE X 6" DEEP
GRAVEL FLOW SPREADER
PER PLAN
2% (MIN)
fil I f I r1I-
AMENDED SOIL, 2" OF
COMPOST TILLED TO 6"
DEPTH (MIN)
DRIVEWAY ENTRANCE DRAINAGE
8.0' (m i n ) I
1. 0' (min)�
O 0 PL
PER I I-
pUT�ET PIPE =I
O O ' in'�ooO �--_,,,� I-E.-PER PjLjAj� j_ j -
-24»I I I -III -III -I I (-I
-III-III- III_II-III-II-III_III-
►►III��IIII„�_IIIII;IIII--„III,;,illlE�ilI=III=III=ill=
PIPE DISCHARGE PROTECTION
EXISTING GRADE
GENERAL DOTES:
1. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH THE KING COUNTY CODE (KCC),
ROAD STANDARDS (KCRS), AND THE KING COUNTY COUNCIL'S CONDITIONS OF
PRELIMINARY SUBDIVISION APPROVAL. IT SHALL BE THE SOLE RESPONSIBILITY OF THE
APPLICANT AND THE PROFESSIONAL CIVIL ENGINEER TO CORRECT ANY ERROR, OMISSION,
OR VARIATION FROM THE ABOVE REQUIREMENTS FOUND IN THESE PLANS. ALL
CORRECTIONS SHALL BE AT NO ADDITIONAL COSTS OR LIABILITY TO KING COUNTY.
2. THE DESIGN ELEMENTS WITHIN THESE PLANS HAVE BEEN REVIEWED ACCORDING TO THE
KING COUNTY DEPARTMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES (DDES)
ENGINEERING REVIEW CHECKLIST, SOME ELEMENTS MAY HAVE BEEN OVERLOOKED OR
MISSED BY THE DDES PLAN REVIEWER. ANY VARIANCE FROM ADOPTED STANDARDS IS
NOT ALLOWED UNLESS SPECIFICALLY APPROVED BY KING COUNTY PRIOR TO
CONSTRUCTION.
3. APPROVAL OF THIS ROAD, GRADING , AND DRAINAGE PLAN DOES NOT CONSTITUTE AN
APPROVAL OF ANY OTHER CONSTRUCTION (E.G. DOMESTIC WATER CONVEYANCE, SEWER
CONVEYANCE, GAS, ELECTRICAL, ETC.)
4. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY, A PRECONSTRUCTION MEETING
MUST BE HELD BETWEEN THE DDES'S DEVELOPMENT INSPECTION UNIT, THE APPLICANT,
AND THE APPLICANT'S CONSTRUCTION REPRESENTATIVE.
5. A COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER
CONSTRUCTION IS IN PROGRESS.
6. CONSTRUCTION NOISE SHALL BE LIMITED AS PER KING COUNTY CODE (SECTION 12.88);
NORMALLY, THIS IS 7 A.M. TO 10 P.M. WEEKDAYS AND 9 A.M. TO 10 P.M. ON WEEKENDS.
7. IT SHALL BE THE APPLICANT'S/CONTRACTOR'S RESPONSIBILITY TO OBTAIN ALL
CONSTRUCTION EASEMENTS NECESSARY BEFORE INITIATING OFF -SITE WORK WITHIN THE
ROAD RIGHTS -OF -WAY.
8. FRANCHISED UTILITIES OR OTHER INSTALLATIONS THAT ARE NOT SHOWN ON THESE
APPROVED PLANS SHALL NOT BE CONSTRUCTED UNLESS AN APPROVED SET OF PLANS
THAT MEET ALL THE REQUIREMENTS OF KCRS CHAPTER 8 ARE SUBMITTED TO THE DESS'S
DEVELOPMENT INSPECTION UNIT THREE DAYS PRIOR TO CONSTRUCTION.
9. DATUM SHALL BE KCAS UNLESS OTHERWISE APPROVED NE DDES.
10. GROUNDWATER SYSTEM CONSTRUCTION SHALL BE WITHIN A RIGHT-OF-WAY OR
APPROPRIATE DRAINAGE EASEMENT, BUT NOT UNDERNEATH THE ROADWAY SECTION. ALL
GROUNDWATER SYSTEMS MUST BE CONSTRUCTED IN ACCORDANCE WITH SECTION B1 3.02
OF THE APWA STANDARD SPECIFICATIONS.
11. ALL UTILITY TRENCHES SHALL BE BACKFILLED AND COMPACTED TO 95 PERCENT DENSITY.
12. ALL ROADWAY SUBGRADES SHALL BE BACKFILLED AND COMPACTED TO 95 PERCENT
DENSITY (WSDOT 2-06.3).
13. OPEN CUTTING OF EXISTING ROADWAYS IN NOT ALLOWED UNLESS SPECIFICALLY APPROVED
BY DDES AND NOTED ON THESE APPROVED PLANS. ANY OPEN CUT SHALL BE RESTORED
IN ACCORDANCE WITH KCRS 8.03(B)3.
14. THE CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING ADEQUATE SAFEGUARDS,
SAFETY DEVICES, PROTECTIVE EQUIPMENT, FLAGGERS, AND ANY OTHER NEEDED ACTIONS
OP PROTECT THE LIFE, HEALTH, AND SAFETY OF THE PUBLIC, AND TO PROTECT
PROPERTY IN CONNECTION WITH THE PERFORMANCE OF WORK COVERED BY THE
CONTRACTOR. ANY WORK WITHIN THE TRAVELED RIGHT-OF-WAY THAT MAY INTERRUPT
NORMAL TRAFFIC FLOW SHALL REQUIRE AT LEAST ONE FLAGGER FOR EACH LANE OF
TRAFFIC AFFECTED. ALL SECTIONS OF THE WSDOT STANDARD SPECIFICATIONS 1-07.23 -
TRAFFIC CONTROL, SHALL APPLY.
7
TEMPORARY EROSION AND SEDIMENTATIO
CONTROL NOTES:
1. APPROVAL OF THIS TEMPORARY EROSION AND SEDIMENTATION CONTROL (TESC) PLAN
DOES NOT CONSTITUTE AND APPROVAL OF PERMANENT ROAD OR DRAINAGE DESIGN (E.G.
SIZE AND LOCATION OF ROADS, PIPES, RESRTICTORS, CHANNELS RETENTION FACILITIES,
UTILITIES, ETC.)
2. THE IMPLEMENTATION OF THESE TESC PLANS AND THE CONSTRUCTION, MAINTENANCE,
REPLACEMENT, AND UPGRADING OF THESE TESC FACILITIES IS THE RESPONSIBILITY OF
THE APPLICANT/TESC SUPERVISOR UNTIL ALL CONSTRUCTION IS APPROVED.
3, THE BOUNDARIES OF THE CLEARING LIMITS SHOWN ON THE THIS PLAN SHALL BE
CLEARLY FLAGGED BY A CONTINUOUS LENGTH OF SURVEY TAPE (OR FENCING, IF
REQUIRED) PRIOR TO CONSTRUCTION. DURING THE CONSTRUCTION PERIOD, NO
DISTURBANCE BEYOND THE CLEARING LIMITS SHALL BE PERMITTED, THE CLEARING LIMITS
SHALL BE MAINTAINED BY THE APPLICANT/TESC SUPERVISOR FOR THE DURATION OF
CONSTRUCTION.
4. THE TESC FACILITIES SHOWN ON THIS PLAN MUST BE CONSTRUCTED PRIOR TO OR IN
CONJUNCTION WITH ALL CLEARING AND GRADING TO ENSURE THAT THE TRANSPORT OF
SEDIMENT TO SURFACE WATERS, DRAINAGE SYSTEMS, AND THE ADJACENT PROPERTIES IS
MINIMIZED.
5. THE TESC FACILITIES SHOWN ON THIS PLAN ARE THE MINIMUM REQUIREMENTS FOR THE
ANTICIPATED SITE CONDITIONS. DURING THE CONSTRUCTION PERIOD, THESE TESC
FACILITIES SHALL BE UPGRADED AS NEEDED FOE UNEXPECTED STORM EVENTS AND
MODIFIED TO ACCOUNT FOR THE CHANGING SITE CONDITIONS (E.G. ADDITIONAL SUMP
PUMPS, RELOCATION OF DITCHES AND SILT FENCES, ETC.)
6. THE TESC FACILITIES SHALL BE INSPECTED DAILY BY THE APPLICANT/TESC SUPERVISOR
AND MAINTAINED TO ENSURE CONTINUED PROPER FUNCTIONING. WRITTEN RECORDS SHALL
BE KEPT OF WEEKLY REVIEWS OF THE TESC FACILITIES DURING THE WET SEASON (OCT. 1
TO MARCH 31) AND OF MONTHLY REVIEWS DURING THE DRY SEASON (APRIL 1 TO SEPT.
30).
7. ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS, THAT WILL NOT BE
DISTURBED FOR TWO DAYS DURING THE WET SEASON OR SEVEN DAY DURING THE DRY
SEASON SHALL BE IMMEDIATELY STABILIZED WITH THE APPROVED TESC METHODS (E.G.
SEEDING, MULCHING, PLASTIC COVERING, ETC.)
8. ANY AREAS NEEDING TESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE
ADDRESSED WITHIN FIFTEEN (15) DAYS.
9. THE TESC FACILITIES ON INACTIVE SITES SHALL BE INSPECTED AND MAINTAINED A
MINIMUM OF ONCE A MONTH OR WITHIN 48 HOURS FOLLOWING A STORM EVENT.
10, AT NO TIME SHALL MORE THAN ONE (1) FOOT OF SEDIMENT BE ALLOWED TO
ACCUMULATE WITHIN A CATCH BASIN. ALL CATCH BASINS AND CONVEYANCE LINES SHALL
BE CLEANED PRIOR TO PAVING. THE CLEANING OPERATION SHALL NOT FLUSH
SEDIMENT -LADEN WATER INTO DOWNSTREAM SYSTEM.
11. STABILIZED CONSTRUCTION ENTRANCES AND ROADS SHALL BE INSTALLED AT THE
BEGINNING OF CONSTRUCTION AND MAINTAINED FOR THE DURATION OF THE PROJECT.
ADDITIONAL MEASURES, SUCH AS WASH PADS, MAY BE REQUIRED TO ENSURE THAT ALL
PAVED AREAS ARE KEPT CLEAN FOR THE DURATION OF THE PROJECT.
12. ANY PERMANENT RETENTION/DETENTION FACILITY USED AS A TEMPORARY SETTLING BASIN
SHALL BE MODIFIED WITH THE NECESSARY EROSION CONTROL MEASURES AND SHALL
PROVIDE ADEQUATE STORAGE CAPACITY. IF THE PERMANENT FACILITY IS TO FUNCTION
ULTIMATELY AS AN INFILTRATION SYSTEM, THE TEMPORARY FACILITY MUST BE GRADED SO
THAT THE BOTTOM AND SIDES ARE AT LEAST ONE FOOT ABOVE THE FINAL GRADE OF
THE PERMANENT FACILITY.
13, WHERE STRAW MULCH FOR TEMPORARY EROSION CONTROL IS REQUIRED, IT SHALL BE
APPLIED AT A MINIMUM THICKNESS.
EXISTING GRADE ROOF DOWNSPOUT, CONNECT TO RIM
ROOF DRAIN SYSTEM PER PLAN OR SO[
LOCATION OF DS TO BE
\"�'
DETERMINED IN FIELD.
2" ACP OVER FIRM UNYEILDING
NATIVE SUBGRADE OR 4" CSTC
OR AS OTHERWISE INDICATED
PER ARCHITECT
SCALE NTS
FINISHED GRADE REFER TO STRUCTURAL
DRAWINGS FOR
° ' a FOUNDATION DETAILS
a ° .o:
ROOF DRAIN SYSTEM
PER PLAN FLOOR SLAB OR
:. dt CRAWL SPACE
H--X -- X-x-x-x-
° o a G
4"0 (MIN) PVC PERF FOOTING ' Q `.aV=ll
DRAIN CONNECT TO STORM . .
DRAIN DO NOT CONNECT TOROOF III_
NOTE: LDRAIN SYSTEM. LOCATION CANVARY , e
BUT IN NO CASE SHOULD
FOOTING DRAIN BE ABOVE _
CRAWL SPACE OR OTHER i-
INTERIOR ELEVATION. III-1 I I ; ,) I I=
ROOF/FOOTING DRAIN
=L. PER PLAN
ATCH BASIN
PLAN
T PIPE
=R PLAN
NOTES:
1. ALL METAL PARTS AND SURFACES MUST BE MADE OF CORROSION RESISTANT MATERIAL OR
GALVANIZED.
TYPICAL TYPE i CATCH BASIN
M
M
N
I I
co
co c
N
N
w
0-
U-z
ry
•
w
� L
O
!
s
m
•
<,
co
o
,
¢�
Q
w
o w
o �-
;:
A
A
r
ii
A
o
�
L
w
Q
Q
Q
N
=
Y
:2
m
m
co
cii
�
o
-
W
o
o
s
0
0
�
z
L
ai
3
D
CL
o
¢
Of
o
o
cn
W
:I&*:
v
(n
a
Z
w�
W
:D
C)
Z
-
Wa
Q
u
J
N
--
L i
W
o
Q
X
X
U.
W
'`
RESUBMITTED
w
SEP
0 $
2011
W CITY OF FEDERAL
WAY
10-105
SHEET TITLE:
CIVIL
12TH AVENUE SW
GENERAL NOTES
AND DETAILS
SHEET NO.
C-3
SCALE NTS
SCALE NTS
SCALE : NTS