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08-103238 (2) Ahhh. 'CITY OF CITY HALLS =8 33325 8th Avenue SouthFederal Way Mailing Address: PO Box 9718 Federal Way,WA 98063-9718 (253)835-7000 www.cityoffederalway.corn May 27,2010 Bryan Franklin, Superintendant Kirtley Cole Associates, Inc. 1010 SE Everett Mall Way, Suite 102 Everett, WA 98208 RE: FILE#08-103238-00-CO;LANDSCAPE EXTENSION Federal Way/King County Regional Library,34200 1"Way South, Federal Way Dear Mr. Franklin: This letter identifies outstanding landscape components that must be completed at the above-referenced library addition project nearing completion. Planning staff signed off on the construction permit as of this date and final certificate of occupancy is pending. LANDSCAPE INSPECTION/EXTENSION REQUEST Pursuant to Federal Way Revised Code(FWRC) 19.125.090,"Performance and Maintenance Standards," planning staff conducted a final inspection on April 1, 2010. Landscaping installation is approved as of this date subject to the April 1, 2010,Inspection Notice,and your May 25, 2010, letter requesting an extension of landscaping installation. The following comments are based on that inspection and a review of the FWRC. The following items from the Inspection Notice must be completed, inspected, and approved by the Planning Division on or before August 25,2010(90 days from the Planning Division sign-off). 1. One deciduous tree is missing between the old and new parking lots as shown on reduced size DLR sheet L3.1 and L3.4 (near Triangle callout#38). This tree must be planted. V 2. Add shrubs along 18'Way South behind the sidewalk in order to block cut-through pedestrian traffic and eliminate attractive nuisance areas. (Refer to red line plan forwarded to Dakota Keen on April 7, 2010.)The approved landscape plans noted that understory vegetation was to be retained in this area. However, clearing occurred and no understory vegetation remains. v 3. Add ground cover to `signage corner' where existing ground cover was removed. 14. Ferns on the east side of the new windows are dead and must be replaced. v5. It is recommended that the owner infill sparsely planted areas in the existing landscape areas that are currently filled with weeds and other non-native vegetation. Note:No review or inspection of rain gardens with this notice. LANDSCAPE MAINTENANCE Please be advised that according to FWRC 19.125.090(2),maintenance of planting areas shall include continuous operations of removal of weeds before flowering; mowing and/or trimming; edging; cultivation; reseeding;plant replacement; appropriate fertilization; spraying; control of pests, insects, and Mr.Franklin May 27,2010 Page 2 rodents by non-toxic methods whenever possible; watering; or other operations necessary to assure normal plant growth. In particular,maintenance shall promote landscape performance criteria of the FWRC. All portions of any irrigation system shall be continuously maintained. SUMMARY Please contact me at 253-835-2642 for a landscape follow-up inspection. Written verification will be provided upon satisfactory completion of the outstanding landscape items. Should you have any questions about this letter,please do not hesitate to contact me. Sincerely, /6/t_ Epti/U1 - Deb Barker Senior Planner c: Lisa Scribante,Mithun Architects, 1201 Alaskan Way,Seattle,WA 98101 Dakota Keen,Mithun Architects, 1201 Alaskan Way,Seattle,WA 98101 Kari Cimmer,Permit Center Supervisor 08-103238 Doc.1.D.54159 CITY OF CITY HALL 1 33325 8th Avenue ouch Federal Way Mailing Address: PO Box 9718 Federal Way,WA 98063-9718 (253)835-7000 www.cityoffederal wa y.corn March 6, 2009 Lisa Scribante Mithun Architects 1201 Alaskan Way Seattle, WA 98101 RE: File#08-103238-00-CO; LANDSCAPE PLAN COMMENTS Federal Way/King Co Regional Library Expansion,34200 Vt Way South,Federal Way Dear Ms. Scribante: Staff have had the opportunity to review landscape plans, resubmitted on 2/26/2009, for the proposed library addition as well as landscape plans for the new parking area and revised storm drainage pond. Prior to building permit issuance, the following comments must be addressed: 1. The submitted landscape plan sheet(L-3.1 ASI-10)depicts a double row of trees(evergreen and deciduous) southeast of the new parking stalls.The double row of trees exceeds the required tree planting requirement for perimeter landscaping and the applicant can elect to have a single row of perimeter trees. 2. Add shrubs to fill in the interior parking lot landscape islands or redistribute the shrubs to fill the interior parking lot landscape islands. 3. Add a tree in the landscape island between the existing and proposed parking stalls. 4. There is one plant symbol on the landscape plan(L-3.1 ASI-10)that is not reflected on the plant schedule(sheet L-3.4) -a circle with three lines inside. Please clarify what plant this is. When resubmitting, provide five(5)copies of any revised plans along with the enclosed Resubmittal Information form. I can be reached at 253-835-2642 if you have any questions about this letter. Sincerely, e 0� � Deb Barker Senior Planner enc: Resubmittal Information form c: Ann Dower,Senior Engineering Plans Reviewer Doc.I.D. 49175 ITLE 1 • COLS,_._...... .. .. Deb Barker, Senior Planner City of Federal Way 33325 8th Ave. S. PO Box 9718 Federal Way, WA 98063-9718 re: Permit #08-102038-CO May 25, 2010 Dear Deb, I am writing this to request an extension for the Planning Department final inspection. The only outstanding issues are the planting of a tree in the Panther Lake Elementary entrance and replacement of some plants that did not come out of dormancy. I expect these issues to be resolved in the next few days, but not before you leave the office for a week. Once you return, we can schedule our final inspection. Please note: this request meets extension criteria #ii and iii from Federal Way Revised Code (FWRC) 19.125.090(1)(e) Performance and maintenance standards as shown below: (e) A CO or final inspection may be issued prior to completion of required landscaping provided the following criteria are met: (i) An applicant or property owner files a written request with the department of community development prior to five days of a CO inspection; (ii) The request contains an explanation as to why factors beyond the applicant's control, or which would create a significant hardship, prevent the installation of the required landscaping prior to issuance of the CO; (iii) The property owner has demonstrated a good faith effort to complete all required landscaping. (f) The time period extension for completion of the landscaping shall not exceed 90 days after issuance of a certificate of occupancy to install required landscaping. 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"i.. .. 0 00— to*�-p i ter• -. /1► J Q CC 10.440064-.11.4.4404.7;PI-'-irillit'414.10400'1•74-61 2L'Iradlit. lirta - :' 4 tit -C 101r.'llylki ...".1tiivzie.. mov:01.i.ix, i ilINE"INE•mmmimin, ilMIN emir a. 0 20 40 60 Ali J ,..,. s • 1"= 20' VP "' .... . J SYM. BOTANICAL NAME COMMON NAME SIZE/SPACING QTY. QTY. (KCLS) o L. 3 a 7---- * ACER RUBRUM RED MAPLE 1.75" CAL. B&B PER PLAN* 23 9 -�� ;� Cliff!' 1 R�ESU T _ Vg. • BETULA PAPYRIFERA PAPER BIRCH 1.5" CAL. B&B PER PLAN* 23 MAR ��� CfT�'tFr �`' , ^Y � ai s PSEUDOTSUGA MENZIESII DOUGLAS—FIR 6 HT.B&B PER PLAN 25 4 A �� r'T a . __ FEDE WAY REGIONAL LIBRARY EXPANSIOI ID RENOVATION FEDERAL WAY,WASHINGTON SECTION 02633 BIORETENTION SOIL MIX PART 1 -GENERAL 1.1 SUMMARY A. Section Includes: 1. Bioretention soil mix. B. Related Sections: 1. Section 02300- Earthwork for excavation, and rough grading. 2. Section 02630—Storm Drainage for underdrainage systems. 3. Section 02917—Soil Preparation for planting soils. 1.2 DEFINITIONS A. Finish Grade: Elevation of finished surface of planting soil. B. Bioretention Soil Mix(BSM): A soil mix that has been specially blended and tested for use in raingardens.This highly permeable soil is part of the storm drainage system and is used to provide stormwater treatment and support plants. C. Subgrade: Surface or elevation of subsoil remaining after excavation is complete, or the top surface of a fill or backfill before planting soil is placed. D. Subsoil: All soil beneath the topsoil layer of the soil profile,and typified by the lack of organic matter and soil organisms. 1.3 SUBMITTALS A. Methods:.Submit a description of the equipment and methods proposed to mix the Bioretention Soil. B. Product Data: Submit sources for all products, and compost certification at least 30 days prior to installation. C. Quality Assurance Submittals: 1. Analysis: Furnish laboratory analysis 30 days prior to installation for: a. Sand. b. Compost. c. Bioretention Soil Mix. 2. Report: Submit interpretation of nutrient analysis and written recommendations from soil testing lab for soil amendments for Bioretention Soil Mix at least 14 days prior to installation. 3. Permeability Test Results: Furnish for Bioretention Soil Mix along with final mix percentages 14 days prior to installation. 4. Samples for Verification. Submit 14 days prior to installation. a. One gallon samples of the following materials to be used in work of this Section: 1) Compost. 2) Sand. 3) Bioretention Soil Mix#1. 4) Bioretention Soil Mix#2. 5) Bioretention Soil Mix—final mix, after adjustments. 5. Quantity Certification: Submit certification of quantities of recommended amendments and estimated quantities of BSM in which they were mixed prior to commencement of planting, 7 days prior to installation. D. Contract Closeout Submittals: 1. Warranty: Sample of special warranty. 1.4 QUALITY ASSURANCE A. Installer Qualifications: A qualified landscape Installer whose work has resulted in successful establishment of plants. 07300.00 02633-1 12/03/08 FEDER JAY REGIONAL LIBRARY EXPANSION ) RENOVATION FEDERAL WAY,WASHINGTON SECTION 02633 BIORETENTION SOIL MIX B. Testing Laboratory Services: 1. Testing Laboratory Qualifications: Laboratories accredited by STA,AASHTO or ASTM or other designated recognized standards organization and with certification maintained current, capable of performing all tests to the designated recognized standards specified, providing test results with an accompanying Manufacturer's Certificate of Compliance. a. Provide the following information about each testing laboratory: 1) Name of lab, including contact person. 2) Address and phone number. 3) Email address. 4) Qualifications of laboratory and personnel including date of current certification by STA, ASTM or AASHTO. 2. Information Supplied to Soil-Testing Laboratory: a. Description of type of plants to be used. b. Project location. c. Product Samples: 1) Verify quantity or soil required for each test. 2) From the source,take a minimum of ten representative samples from equally spaced locations at 12-inch depth for each ingredient producing at least twice the quantity required. 3) Thoroughly mix all samples in a separate clean bucket for each soil type. 4) Place quantity of mix required into a sealable plastic bag for testing. Label bag with site information,area of sample,contractor name and phone number. 3. Soil-Testing Laboratory Analyses: a. Sand Analysis. Include: 1) Sieve analysis showing gradation of sand, silt, and clay content. 2) Complete mineral and plant-nutrient content. 3) Gradation coefficients. b. Compost.Analysis. Perform test in accordance with Seal of Testing Assurance standards. 1) Include all items listed for Compost in Part 2. 2) Compost analysis must be performed within 90 days of use. c. Bioretention Soil Mix analysis. Include: 1) Complete mineral and plant-nutrient analysis, including but not limited to total organic content, per TMECC 05.07A, "Loss-On-Ignition Organic Matter Method." 2) Interpretation of nutrient analysis and written report from soil testing lab. Include: a) Suitability of tested BSM for growing intended plants. b) Recommendations for soil amendments to be incorporated, in weight or volume per cu. yd.for nitrogen, phosphorus, and potash nutrients, or other soil amendments needed to produce soil conducive to healthy growth of intended plants. 4. Permeability Test: By a qualified, regional geotechnical-testing laboratory capable of performing all tests to the designated, recognized standards. a. Use ASTM D 2434 test method to test Bioretention Soil Mixes#1 and#2 at 85% relative compaction. b. Submit results for each sample mix required. C. Preinstallation Conference: Conduct conference at Project site,with Landscape Architect, Civil Engineer and Landscape Installer present. Discuss the following items: 1. Schedule 2. Products 3. Soil Testing 4. Permeability Testing 5. Adjustments 6. Installation D. Notification for Review: Notify Architect five(5)days in advance of the following review points: 1. Raingarden Subgrade Review 2. Finish Grading Review 07300.00 02633-2 12/03/08 FEDI _WAY REGIONAL LIBRARY EXPANSIC ND RENOVATION FEDERAL WAY,WASHINGTON SECTION 02633 BIORETENTION SOIL MIX 1.5 DELIVERY, STORAGE,AND HANDLING A. Packaged Materials: Deliver packaged materials in original, unopened containers showing weight, certified analysis, name and address of manufacturer, and indication of conformance with state and federal laws if applicable. B. Protect the BSM from all sources of additional moisture until incorporated into the Work. 1.6 PROJECT CONDITIONS A. Field Measurements: Verify actual grade elevations, service and utility locations and dimensions of planting areas and adjacent construction by field measurements before proceeding with planting work. Notify Architect if discrepancies exist between plans and actual conditions. B. Weather Restrictions: Do not mix or place BSM if the area receiving it is wet or saturated or has received more than '/2-inch of precipitation with 48-hours of mixing or placement, in the opinion of Architect. 1.7 WARRANTY A. Special Warranty: Installer agrees to repair or replace work of this Section that fails in materials or workmanship,within specified warranty period. 1. Failures include, but are not limited to,the following: a. Excessive settling of soils. b. Presence of horsetail, morning glory or other nuisance weeds in planting soils. 2. Warranty Period from Date of Planting Completion: 12 months. 3. Include the following remedial actions as a minimum at end of warranty period: a. Correct grades that have settled b. Provide nuisance weed eradication from planting areas. 1.8 MAINTENANCE A. Maintenance: Maintain as required to eradicate imported weeds and correct settlement. Begin maintenance immediately after soil is installed and continue for 30 days after Planting Completion. PART 2-PRODUCTS 2.1 WSDA APPROVED PRODUCTS A. Approved products: Use soil amendments and fertilizers only if approved by the Washington State Department of Agriculture for use in organic food production and processing. A list of approved products can be found at the WSDA Organic Food Program website, under the"Materials Lists and information"link. 07300.00 02633-3 12/03/08 FEDEI NAY REGIONAL LIBRARY EXPANSIOI D RENOVATION FEDERAL WAY, WASHINGTON SECTION 02633 BIORETENTION SOIL MIX 2.2 SAND A. Sieve Analysis: Provide sand meeting the following gradation: Sieve Size Percent Testing Passing Method 1 -inch 100 ASTM D 422, No.4 60- 100 Standard Test Method for Particle • No. 10 40- 100 Size Analysis of Soils. No.40 15-50 No.200 0-5 B. Gradation coefficients: Provide sand meet the following: 1. Coefficient of Uniformity(Cu= D60/D10)equal to or greater than 6. 2. Coefficient of Curve(C,= D302/D60D10)greater than or equal to 1 and less than or equal to 3. 2.3 COMPOST A. Compost: Well-composted, stable, and weed-free organic matter; not resembling the raw materials from which it was derived and meeting the following: Criteria Testing Method pH range of 5.5 to 8.0 TMECC 04.11-A "1:5 Slurry pH" Moisture content 35 to 55 percent by weight 99-100% passing through 3/4-inch sieve 90-100% passing through 5/8-inch sieve TMECC 02.02-B"Sample Sieving for 40-90% passing through '/.-inch sieve Aggregate Size Classification" TMECC 04.01 "Total Carbon Carbon:Nitrogen Ratio: Maximum 20:1. TMECC 04.02-D"Total Kjeldhal Nitrogen" Total organic matter content of 45%to 65%dry TMECC 05.07-A"Loss-On-Ignition Organic weight basis Matter Method" Maturity>80% TMECC 05.08-B"Carbon Dioxide Evolution Rate" Soluble salt content of maximum 5 mmhos/cm TMECC 04.10-A"1:% Slurry Method, Mass Basis" Manufactured inert contaminants less than 1.0 TMECC 03.08-A"percent dry weight basis" percent dry weight or volume basis Feedstock: Min. 65%from recycled plant waste; max. 35%from food or approved organic waste, but not biosolids. Stability: 7 or below TMECC 05.08-B"Carbon Dioxide Evolution Rate" 07300.00 02633-4 12/03/08 FED L WAY REGIONAL LIBRARY EXPANSII ,ND RENOVATION FEDERAL WAY, WASHINGTON SECTION 02633 BIORETENTION SOIL MIX • B. Free of substances toxic to plantings C. Tested within 90 days prior to application. D. Certified through the U.S. Composting Council's Seal for Testing Assurance Program. 2.4 BIORETENTION SOIL MIX A. Bioretention Soil Mix consists of a uniform mix of ingredients that infiltrates at a rate within a specified range, as shown by testing. It is then tested and amended for nutrient levels. B. Mix the following ingredients thoroughly, by volume in the proportions shown: 1. Component Mix#1 Mix#2 Sand 60% 70% Compost 40% 30% C. Permeability Test: Send samples to geotechnical testing laboratory and submit results. Architect will determine final mix based on samples and test results submitted. D. Adjustments: Adjust mix proportions as directed by Architect. E. Amendments for plant growth: Submit sample of final, adjusted mix to soil-testing lab for complete nutrient analysis test. Add soil amendments and fertilizers in quantities recommended by soil testing lab to produce bioretention soil mix that is uniformly mixed and suitable for healthy, viable plants. F. Extraneous materials: BSM contains no roots, plants,weeds, sod, stones, clods, pockets of coarse sand, construction debris or other extraneous materials harmful to plant growth. PART 3-EXECUTION 3.1 PROTECTION A. Compaction: Protect all areas to receive BSM from compaction. If possible, leave existing grades in place until raingardens are ready for excavation, in order to protect infiltration areas from compaction. After existing grades are excavated to any level,do not store materials or operate any equipment; install protective fence around perimeters and post signs. B. Siltation: Prior to preparation of subgrades at areas to receive BSM, remove any accumulated sediment. 3.2 EXAMINATION A. Examine areas to receive BSM for compliance with requirements and conditions affecting installation and performance. 1. Verify that subgrade is ready for BSM placement: a. Subgrade is deep enough to place BSM to required depths. b. Subgrade has been scarified as required and compaction from construction activities has been remedied to satisfaction of Architect. c. Underdrains and gravel filter blanket are in place. 2. Verify that no foreign or deleterious material or liquid such as paint, paint washout, concrete slurry, concrete layers or chunks, cement, plaster, oils, gasoline,diesel fuel, paint thinner, turpentine,tar, roofing compound, or acid has been deposited in raingarden planting areas. 3. Do not mix or place BSM in frozen,wet,or muddy conditions. 4. Suspend BSM work during periods of excessive soil moisture until the moisture content reaches acceptable levels to attain the required results. 07300.00 02633-5 12/03/08 FEDE WAY REGIONAL LIBRARY EXPANSIOI ID RENOVATION FEDERAL WAY,WASHINGTON SECTION 02633 BIORETENTION SOIL MIX 5. Uniformly moisten excessively dry soil that is not workable or too dusty. B. If contamination by foreign or deleterious material or liquid is present in soil within a raingarden, remove the soil and contamination and replace with new planting soil. C. Proceed with installation only after unsatisfactory conditions have been corrected. D. Notify Architect for Subgrade Review. 3.3 BIORETENTION SOIL MIX INSTALLATION A. Install BSM: Install in loose lifts not exceeding 8"depth and compact to a relative compaction of 85% of modified maximum dry density(ASTM D 1557). Place to required levels, but not less than required to meet finish grades and profiles after natural settlement. Do not place if BSM is frozen, muddy, or excessively wet. B. Finish Grading: Grade planting area to a smooth, uniform surface plane with loose, uniformly fine texture. Rake, remove ridges, and fill depressions to meet finish grades and profiles shown. C. Notify Architect for BSM Finish Grading Review. 3.4 MAINTENANCE A. Add BSM as necessary to correct soil subsidence due to settling or other processes. Replace mulch or plant materials damaged or lost in areas of subsidence. 3.5 CLEANUP AND PROTECTION A. During work of this section, keep adjacent paving and construction clean and work area in an orderly condition. B. Protect soils from damage due to landscape operations and operations of other contractors and trades. Maintain protection during and after installation and throughout maintenance period. Treat, repair,or replace damage or disturbance. 3.6 DISPOSAL A. Remove surplus soil and waste material including excess subsoil, unsuitable soil, trash, and debris and legally dispose of them off Owner's property. END OF SECTION 07300.00 02633-6 12/03/08 MITHUN KI NG Archltectsr Designer; Planners COUNTY LIBRARY SYSTEM Federal Way Regional Library Stormwater Technical Information Report December 3, 2008 ii.o.rodcA10( L1.�.. • RESUBMITTED JAN 2 3 2009 CITY OF FEDERAL WAY BUILDING DEPT. , P 4.04 Stormwater Technical Information Report December 3, 2008 Prepared for: Mithun Pier 56 1201 Alaskan Way,Suite 200 Seattle,WA 98101 Prepared by: KPFF Consulting Engineers 1601 Fifth Avenue,Suite 1600 Seattle,WA 98101 (206)622-5822 KPFF No. 107494.40 /17 1101.14 ,,e ! 0/STEAxl-, sU:y� At_ fir` Federal Way Regional Library Stormwater TIR iMll This page has been intentionally left blank. Federal Way Regional Ubrary �� Stormwater TIR its . Table of Contents 1. Project Overview 1 2■ Conditions and Requirements Summary 1 Core Requirement No. 1: Discharge at the Natural Location 1 Core Requirement No.2: Off-Site Analysis 2 Core Requirement No.3: Flow Control 2 Core Requirement No.4: Conveyance System 2 Core Requirement No. 5: Erosion and Sedimentation Control(ESC) 2 Core Requirement No.6: Maintenance and Operations 2 Core Requirement No. 7: Financial Guarantees and Liability 3 Core Requirement No.8: Water Quality 3 3■ Off-Site Analysis 3 Off-Site Analysis Report 3 4. Flow Control and Water Quality Facility Analysis and Design 3 Flow Control Facility Analysis and Design 3 Water Quality Facility Analysis and Design 4 5. Conveyance System Analysis Design 4 Conveyance System Analysis 4 6. Special Reports and Studies 5 Geotechnical Report 5 Wetland Report 5 7■ Other Permits 5 Federal Way Regional Ubrary Stormwater TtR III 8. ESC Analysis and Design 5 ESC Analysis 5 ESC Design 5 9■ Bond Quantities,Facility Summaries,and Declaration of Covenant 6 Bond Quantities 6 Facility Summaries 6 Declaration of Covenant 6 10. Operations and Maintenance Manual 6 Appendices Appendix A- Figures A-1 TIR Worksheet A-4 Site Location Map A-5 Existing Drainage Basins,Sub-Basins,and Site Characteristics Map A-6 Proposed Drainage Basins,Sub-Basins,and Site Characteristics Map Appendix B- Figures B-1 Geotechnical Map Appendix C- Figures C-1 Runoff Calculations Appendix D- Figures D-1 Original Conveyance Calculations Federal Way Regional Library IV Stormwater TIR / f .04 k . if • , 1 . Project Overview The proposed project site is located in Federal Way,Washington, near City Hall. The site is located east of 1st Way South,between South 336th and South 348th Streets. Please refer to Appendix A, Figure A-1,for a Technical Information Report(TIR)worksheet,and Figure 3,for a map showing the project location. The existing site was developed in 1991. Drainage plans and a Technical Information Report(TIR)were submitted to the City of Federal Way in February of 1991. The original construction included a detention pond and water quality facility in the south corner of the project site,adjacent to Panther Lake Elementary School. Library Lane and a portion of the parcel northeast of Library Lane contribute stormwater to the project site. Runoff from this area and the majority of the project site is released to the Panther Lake Elementary School site,while runoff from approximately one acre of land east of the existing building is conveyed directly to the hospital property to the southeast. An approximately 9,000 square foot(sf)addition will be added to the existing 25,000 sf building. The existing stormwater detention facility will remain in its current condition,while additional water quality facilities will be added downstream on the school district property. The new water quality facility on the school site will replace the existing water quality ponds on the library site,as well as provide treatments for the new parking and access roads. Please refer to the Geotechnical report by Landau Associates for soils information regarding the project site and surrounding areas. 2. Conditions and Requirements Summary The following section describes how each of the eight Core Requirements and five Special Requirements applies to this project and how the requirements will be met. Federal Way Regional library Stormwater TIR 1 Q� CORE REQUIREMENT NO. 1: DISCHARGE AT THE NATURAL LOCATION Stormwater currently discharges from the project site at two locations. The approximate contributing drainage basins to each of these areas will be maintained,and neither discharge location will be modified. CORE REQUIREMENT NO. 2: OFF-SITE ANALYSIS An off-site analysis report was previously submitted to the City of Federal Way under separate cover. The off-site analysis included a field visit to examine the existing discharge and research with City of Federal Way drainage maps to characterize the downstream area. This map review was performed for one mile south,to the Hylebos Blueberry Farm. CORE REQUIREMENT NO. 3: FLOW CONTROL This project is exempt from providing a formal flow control facility based on Exemption No.3 Peak Flow, because the increase in flow for this project is less than 0.1 cubic feet per second(cfs). In addition to using rain gardens to provide some flow control benefit and impervious surface mitigation,roof downspout controls will be provided,and runoff from approximately one-third of the new roof will be dispersed south to the existing trees. CORE REQUIREMENT NO. 4: CONVEYANCE SYSTEM For existing systems with no change in flow rate or volume,no analysis is required. For existing systems with changes in flow rate or volume,existing pipes must be analyzed for the 10-year/24-hour design storm. A slight increase in flow rate is proposed for a portion of the existing pipes. Information from the original project TIR was used to verify that pipe capacity exists to convey the increased flows. CORE REQUIREMENT NO. 5: EROSION AND SEDIMENTATION CONTROL (ESC) Temporary Erosion and Sedimentation Control(TESC)will be provided for all disturbed areas of the project. A TESC plan will be prepared to show the minimum TESC measures required by the contractor. These TESC measures will include clearing limits,cover measures,perimeter protection,and catch basin protection. Permanent erosion and sedimentation control will be provided by the building foundations,landscaping, and paving. Federal Way Regional Library 2 Stormwater TIR k i/ CORE REQUIREMENT NO. 6: MAINTENANCE AND OPERATIONS Maintenance will be required for the proposed rain gardens and downspout conveyance system,and will be provided by the Federal Way Regional Library. Maintenance of the new water quality facility will be provided by the facility manufacturer,and will be paid for jointly by the Library and Panther Lake Elementary School. An Operation and Maintenance Manual will be submitted under separate cover after the site design is approved,and a Declaration of Covenant for the facilities will be recorded with the City of Federal Way. CORE REQUIREMENT NO. 7: FINANCIAL GUARANTEES AND LIABILITY A Drainage Facilities Restoration and Site Stabilization Financial Guarantee must be posted for the proposed rain gardens and water quality facilities. This guarantee is not required for downspout dispersion systems. CORE REQUIREMENT NO. 8: WATER QUALITY Water quality treatment is required per Core Requirement No.8. Treatment must be provided per the Resource Stream Protection Menu in the 1998 King County Surface Water Design Manual (KCSWDM). Because this project will create more than 5,000 sf of impervious area and more than 5,000 sf of new building footprint,water quality system upgrades are required per Federal Way City Code(FWCC)Section 22-337, "Nonconforming Water Quality Improvements." The existing water quality system was constructed prior to the 1998 KCSWDM,and facility improvements are required to meet FWCC Section 22-337. 3. Off-Site Analysis OFF-SITE ANALYSIS REPORT A qualitative Off-Site Analysis Report was submitted to the City of Federal Way under separate cover. Federal Way Regional Library Stormwater TIR 3 irma 4. Flow Control and Water Quality Facility Analysis and Design FLOW CONTROL FACILITY ANALYSIS AND DESIGN Level 1 flow control is required per Core Requirement No.3. For this project,rain gardens will be used to provide partial flow control of runoff from new roof areas. Because roof downspout controls will be installed and the increase in the existing 100-year flow will be less than 0.1 cfs when modeled with the rain gardens, additional flow control facilities will not be provided. Please see Appendix B for impervious area and flow calculations. Please also refer to Figures A-5 and A-6 in Appendix A for a visual depiction of basin areas. Using the 2005 KCSWDM Section 5.2.3(2)as a guide,the rain gardens have been sized to mitigate at least 40 percent of the new impervious building area. In accordance with Table 5.2.2.A of the 2005 KCSWDM, impervious surface area mitigated by the rain gardens is modeled as 50 percent impervious and 50 percent grass. For 3 inches of runoff and 12 inches of effective storage in the rain gardens,each square foot of rain garden can collect runoff from 4 square feet of new building area. This 4-square-foot area is then modeled as 2 feet of impervious area and 2 feet of grass. The roof over the new building addition is separated into three"lobes." The northern lobe drains to a rain garden on the north end of the building and overflows west to the detention pond via the existing drainage system. Re-grading of the site on the north end of the building to accommodate the new building addition will also divert runoff from approximately 4,147 square feet of land to the existing detention system. The central lobe drains to a rain garden on the south side of the building and overflows south to the existing trees between the building and driveway. These existing trees sit in a low point that overflows through a culvert,under the existing driveway,and into the adjacent property to the south. This area was considered as tributary to the detention pond in the original TIR calculations,but actually flows south and bypasses the detention facility. The length of the flowpath through native vegetation from the rain garden discharge to the driveway culvert is approximately 150 feet. The southern lobe drains southwest to a rain garden and overflows southwest to the detention pond via the existing drainage system. Federal Way Regional Library 4 Stormwater TIR ! . , / ,, WATER QUALITY FACILITY ANALYSIS AND DESIGN As mentioned in Chapter Two, Resource Stream Protection Water,quality treatment is required per Core Requirement No.8. Because this project will create more than 5,000 sf of impervious area and more than 5,000 sf of new building footprint,water quality system upgrades are required per FWCC Section 22-337, "Nonconforming Water Quality Improvements." A new water quality vault will be provided under a separate permit on the Panther Lake Elementary School. This facility will replace the existing ponds and will provide water quality treatment for Library Lane,the Federal Way Library parking lot,and the Panther Lake Elementary School service drive. Please refer to the Panther Lake Elementary School TIR for water quality analysis and design. 5. Conveyance System Analysis Design CONVEYANCE SYSTEM ANALYSIS No changes to the existing conveyance system are proposed. The existing system was designed in November of 1990 by DOWL Engineers to convey the 25-year storm using the Rational Method,which is a conservative calculation method. A slight increase in flow rate is proposed for a portion of the existing pipes. The maximum flowrate increase expected in any pipe is 0.1 cfs. An excerpt showing conveyance calculations from the original project TIR is presented in Appendix D. This information was used to verify that pipe capacity exists to convey the maximum increased flow of 0.1 cfs. In this case,the minimum capacity available is 0.3 cfs,which is greater than the maximum expected increase in runoff. Downspouts from the new roof area will be connected to rain gardens by landscape runnels. These runnels are open,above-ground architectural metal features that will allow library users the opportunity to see runoff enter the rain gardens. Overflow from Rain Garden No.2 will be routed to the existing vegetated area southeast of the building using perforated pipes surrounded with gravel per 1998 KCSWDM Figure 5.1.3.A. Flows from this pipe and gravel trench are then dispersed into the native vegetation. The native vegetation then overflows south to the adjacent property,through a culvert under the library driveway. Overflow from Rain Gardens No. 1 and No.3 will be routed to the detention system through a new 6-inch plastic pipe to existing catch basins. Federal Way Regional Ubrary Stormwater TIR 5 L►�:/iI 6. Special Reports and Studies GEOTECHNICAL REPORT A geotechnical report from Landau Associates will be submitted to the City of Federal Way under separate cover. WETLAND REPORT A wetland investigation report was submitted to the City of Federal Way under separate cover. This report showed that no wetland buffers are required on this site. 7. Other Permits This section is not applicable to this report,as no other permits are required. 8. ESC Analysis and Design Approximately half of one acre will be cleared and graded to construct the library addition. This construction activity will occur on relatively flat ground with some slopes along the north and east sides of the property that slope toward the site. ESC ANALYSIS A quantitative ESC analysis will not be performed for this project,as neither sediment traps nor sediment ponds will be used for the project. ESC requirements will be met with Best Management Practices such as clearing limits,cover measures,and perimeter protection. ESC DESIGN Minimum facilities are shown on the TESC plan,and the contractor will adjust and/or increase the proposed facilities as required to prevent sediment from leaving the site. Federal Way Regional Library 6 Stormwater TIR ,_ l "TEA 4.14' i ., 9. Bond Quantities, Facility Summaries, and Declaration of Covenant BOND QUANTITIES A Bond Quantities Worksheet will be used to calculate the bond value of proposed stormwater facilities and will be submitted under separate cover after the site design is approved. FACILITY SUMMARIES A Flow Control and Water Quality Facility Summary Sheet and Sketch will be submitted under separate cover after the site design is approved. Summary sheets for the off-site water quality facilities will be submitted under separate cover. DECLARATION OF COVENANT A Declaration of Covenant may be required for the privately maintained rain garden flow control facilities. If required,this document will be recorded with the City of Federal Way. 10. Operations and Maintenance Manual An Operations and Maintenance Manual will be submitted under separate cover after the site design is approved. Federal Way Regional Library Stormwater TIR 7 This page has been intentionally left blank. Federal Way Regional Library 8 StormwaterTlR � l r Appendix A Figures A-1 TIR Worksheet A-4 Site Location Map A-5 Existing Drainage Basins,Sub-Basins,and Site Characteristics Map A-6 Proposed Drainage Basins,Sub-Basins,and Site Characteristics Map Federal Way Regional Library Stormwater TIR Appendix A riyure King County Department of Development and.Environmental Services TECHNICAL INFORMATION REPORT {TIR) WORKSHEET Part 1 PROJECT OWNER AND Part 2 PROJECT LOCATION AND PROJECT ENGINEER DESCRIPTION Project Owner Project Name King County Library System King County Regional Library Expansion Address Location 34200 1st Way South. Federal Way Township 21 North Phone Range 4 E Project Engineer Section 20 Jesse Williams Company KPFF Consulting Engineers Address/Phone (206)±22-5822 Part 3 TYPE OF PERMIT Part 4 OTHER REVIEWS AND PERMITS APPLICATION Subdivison DFW HPA Shoreline Management Short Subdivision COE 404 Rockery Grading DOE Dam Safety Structural Vaults Commercial (Expansion) FEMA Floodplain Other Other COE Wetlands Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community Drainage Basin Hylebos Part 6 SITE CHARACTERISTICS River Floodplain Wetlands Off-site to south/east Stream Seeps/Springs Critical Stream Reach High Groundwater Table Depressions/Swales Groundwater Recharge Lake Other Steep Slopes A-1 I Part 7 SOILS Sod Type Slopes Erosion Potential Erosive Velcoties EwC 3 -10% slight - moderate (Glacial Till) EvB possibly in SE corner Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE ':.'MITATION/SITE CONSTRAINT • Ch. 4—Downstream Analysis None Additional Sheets Attached Part 9 ESC REQUIREMENTS \- MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION AFTER CONSTRUCTION Sedimentation Facilities d urf ce Stabilized Construction Entrance ,move and Restore Temporary ESC Faciljtieg perimeter f 3unoff Control „dean and Remove All Silt and Debris Cle4rinc and Graina Restrictions Ensure Operation of Permanent Facilities Cover Practices Flag Limits of SAO and open space preservation areas Other Other ` I A-2 Part 10 SURFACE WATER SYSTEM Method of Analysis Grass Lined (exist.) Infiltration y Channel CIA (exist.) Vault * Depression P'., - ,t (exist.) Compensation,'Mitigati Energy Dissapator Flow(Dispersal on of Eliminated Site Open Channel Wetland Waiver Storage Dry Pond (exist.) Stream Regional Rain Garden Wet Pond (exist. - to be Detention removed) Brief Description of System Operation Existing hardscape is pipes to pond/tank. New roof area will drain to natural vegetation and also to rain gardens before discharging to existing system. Facility Related Site Limitations Reference Facility Limitation *New water quality vault proposed on downstream property. Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTS/TRACTS Cast in Place Vault Drainage Easement Retaining Wall Access Easement Rockery>4' High Native Growth Protection Easement Structural on Steep Slope Tract Other Other School will have easement to library property Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I or a civil engineer under my supervision my supervision have visited the site. 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"-----• s • ..-,••,,,, • ••••••••.,•• 9110 ... .., , , SOUTH ' ,, ....., ...........,..., .,./. , .....,„,„:,:,:,•„•::::::„..,, sI\ ••,::i•,;••;•,:i,...„ ••••• , • ., . •• 2 , 1 ' r .....„.., _ , , ,,,,,.L............. .._ ............„, 750451 0090 "*." ,.. 3................,.......... ..-.,.• 3 • • / ... .. '''' , : . ''''' \ s. 3 \ .,•:.:..• , • ' ' ''''''''''':"'''''"":'"'--. s'''' -3 ? -1-) : ...t.t:.-..:•:?,- .7.-7,r"''.—"-- "--"'".-"---•,-,---- , : ,,''. ii!: 1 1 •••:•,,,,,, :„.„..... , : ,,,,,, : ,-.:,,,,,:-..,],'•'.,„.-.•.,..;,,-\,,, •••• f ..:-- -- ',1.\ !!:,!'!,•• ,4 .. ....„.........„.„...... .., , , ., ...,' : ... : .......,.......,, ...... .....„,,,,,,,, cog' / . ,„,....,............„..., ... , ., , •. ' • 'J '.. 64. ..mma:a ,,,,,,.„ .., , ,• . .• •. , / /, • . .., s,•?- ,, i / / ;, „„„_.„ 202104 , ( : $• ••„ \,• ..,.••••,,,* - , '‘, 1 ' . , , 9156 \ s.... f '. „. , -;/I k *, s-..„-- „- : „. , •---/ / . .• „ „/ ' .:t ,,..., -,........,.„„... ... , 1 1 / i; , , . (', / A ,./ „ , s " ,,, ."' 710 •, ' •:i 1 / -' s \ \\„„, ,••••--• ... - "'s--"' : • • ,.., „•• • • ..- , -\ „"1/ )'' 's I's- . ,- „...' 750451 • 1 k , • ' . ' , ,..........._ ,,,, ', i i..:'• ' ' fs.:.„.. s.c.. ... . I; 1 , , , , . , . • i / ......--• „ - I; i •, -"." ooao •••••; $ , • • . .. .. . .. , - • ...- : , E 1„._ . . • ., . „ ••• , o — . • • •..--- z Lr) co SHEET LL, FEDERAL WAY LIBRARY DRAWN BY DESIGNED BY DATE „:•„ .. ........ „.., .„,. .:.. - ..," . , '":"'It"':'::::::"" 41" Consulting Engineers c..) E ...... ,...... ...... ...... (NJ JOB No. : 1601 Fifth Avenue, Suite 1600 A-5 c\I &D-: CHECKED BY APPROVED BY (NI Seattle, Washington 98101 FIGURE 3- EXISTING BASIN MAP , SCALE: 1:200 (206) 622-5822 Fax (206) 622-8130 --- >< • rHs7o r 1. eZ € t \\ �220 f t, \ \ ! \\ o3sa { - k, ,3 ...............`'<13 ar _ ��, r NEW BLDG AREA fl� 15 AC .a • \132201 �\ 0400 .r ; \,. J "\ ` \ �x 0bf° \\ �; \ _ \ , _= AREA MITIGATED BY RANI„ DENS=0.04 r32211? / \�\1 oa222°-0t .N 1 .2 ?Ot oo�; \ .�\ f j \\\ ,.. zozloa 05D3 \... vsrv �, i© \ tOf \ N� •a 9157 =\ / ;� \ : NET NEW IMPERVIOUS BLDG A A 0175 t >\ \ / 13'C20$ 1322Qr \',• \ \ 'f m� `\\\ •1 /� \\ 0530 a = 0 •3 1 ;rt Y3220, ° , •\ r3220, ';% \\ NEW IMPERVIOUS PAVING=0.19 AC Y aa 8;tiv o300 \•o2eo . • 0540.. : \.1322'E13 /+ ', \\\ m.„. • o2TD i /15 '132202 �3r F � ° 13220 `\ TOTAL NEW IMPERVIOUS AREA=0.365 , -i3 13vo2" \ \ > / UPSTREAM SUB B N= 132201 10 78 AC FOREST ON TILL` pY "'•-"" k \'•\ 132202 ' "\.• "132201 i F i 3 3 r 0620 \'..0240 ` fY770Y 05sa j • \\ ,ON—SITE SUB—BASIN=0.65 AC Kl. \\ 202104? : 1 r 2o2 ` BYPASSES DRAINAGE FACILITY �\ 9156 o ti2t,2„N 32202\ �06� .' \, \, .a .• .\\. \\ i ...,. 1.sdN2 E \ 132202 {{ _0-3 \ ♦♦♦ • Li-i ..,:: •:,:::::,,,,,,,,,,„„„. ..,. \‘‘,\\,8`.ss ..•.., \s\•• ., U `,...czi 202104 9058 • \ ? r ; \ ' .... I:: ,-• ,,92,04 3 sooa + '' - t /,'. ,.. £• "'•`__LIBRARY'LANE c .. .. 2021049050+• t_ i J • SUB BASIN 0 58, AC . w . F y'..... •, LANDSCAPING=0.07 AC/ ♦ 2021049071 ....__.........._..._..__....♦. c IMPERVIOUS-0.51 AC F•w~�ti, ON—SITE SIN DRAININGTO _ w ` ` " ' o TE SUB—BA •75045,o„o E: STORMWATER FACILITY 4.34 AG . DRAINAGE',FACILITY OUTLET ant e LANDSCAPING- AND UNDISTURBED : , __.. CONTRIBUTING _A REA=1:6.35 AC ♦. RAREA=1.80 AC _ \` ...y: \\,— s „ 7soast o030 —0.65=15.70 AC •`TOTAL _ , ' N IMPERVIOUS-2.54 AC` s. a • • , 0 { 5plSt oi714 ti 'p . 7 ,t Z...„. 3 �\ - ro , EXISTING WETLAND 202f04 0451 A 0 SOUTH =\� 75 9038 \ /..z..,....,.: ,___..___..... r : • •• \ \�\ 750451 0090 .. N ` �, '`� `+♦. :'p,;• w...yy..♦ilVa.VpD:.vr�.m»>.gwA...`w,w� • 5920'; �,.a„ • I {1 `e= '� i .,of 'f r 'i 4 • y q ;; Y.♦..-A.....A...:Yw':'♦ N 1t- fin_'0.....+0 •♦ ).....6 0080 ...-`; ii,i,k`Z •.♦ 750451 r r _ FOX " ♦ , Lf) oi W o DRAWN BY DESIGNED BY DATE FEDERAL WAY LIBRARY SHEET N o Consulting Engineers JOB No. : 1601 Fifth Avenue, Suite 1600 A-6�= CHECKED BY APPROVED BY Seattle, Washington 98101 FIGURE 4 - PROPOSED BASIN MAP SCALE: 1:200 (206) 622-5822 Fax (206) 622-8130 do F ` oio,,4 �y Appendix B Figures B-1 Geotechnical Map Federal Way Regional Ubrary Stormwater TIR Appendix B 1::::: G s coraN bane ��� ______--------seill19 m_:::-------\----, , -il „;—'•'',,,,,,r) ::;;:1':'"--------:-;::,;;:: ',,,:f.,'',,, ,,,,7'''`--- / '� fr a� __�/ .. ;$'gym 6 r� ,, d q L �/ // - - 2 / r..✓\off _(.� f w A > ,yam fr\ .> �^ fr � x .,.v isIC' ..__ � I ; ,1 � rs" -7� ( I , / , ''',.x , ,, ' ''' a \ , , , , ,,. ,,-,_,,,,,,, ,,,„ ,,. ....„, .,,„, ,... Proposed Drainage ,: r " Swale a cN. / Quo b 8 \ �' / `/ 1 c° Q B-7 ,\v\,A �`> Q B5 2111. ff� � / c \ , \, , ,_ _ : t ` \\\\c‘\[ % ,, 47 B-2 {�,S ;4 Z, 111 ,,h , �i, / o t 1 ` '`B-88 '}'• > / • m ✓ o d ..�"" 0 0 • Existing Buildingtt } Legend ? A Finish Floor Elevation=268.5 B-3 Proposed Rain Garden o x Per 1990 Plans / B 1 • Hand Auger Boring(Completed N February 12,2008) • J � - � Previous Test Pit(Completed '23: \ �♦ March 1990) J N I } O cc i `° I I B • Base map source: AHBL, February 12, 2008 o o u_ I • King County Library System 1I I 0 30 60 Federal Way Regional Figure LA LANDAU Library Expansion Site & Exploration Plan ASSOCIATES Scale in Feet Federal Way, Washington B-1 !Iftrinnfei I .. • �' Appendix C Figures C-1 Runoff Calculations Federal Way Regional Library Stormwater TIR Appendix C Federal Way Regional Library KPFF # 107494 January 9, 2009 Verify that increase in site flows is less than 0.1 cfs. Calculate Developed Area: Square Feet(SF) Acres(AC) New building area for project: 9,376 _.. 0.215 Add' impervious surface for access roads/parking lot= 8,384 s( 0.192 Calculate Net Impervious Area: G Total area of rain gardens on project: "k 925 0.021 Calculating bldg area mitigated by rain gardens as 50%grass and 50% impervious, For 3"of roof runoff and 12"of effective storage, New bldg area modeled as grass: 1,850 0.042 ' New bldg area modeled as impervious: 61/7,526 0.173 0.000 Net new impervious area: 15,911 0.365 '- l `ij KCRTS Calculations Total Increase in Flow: 100-yr flow for 0.365 acres of grass on till with 1-hour time step: 0.077 cfs 100-yr flow for 0.365 acres of impervious**with 1-hour time step: 0.172 cfs Difference: 0.095 cfs <0.1 cfs Per KCSWDM Core Req#3 Exemption#3A with roof downspout controls per Section 5.1, a flow control facility is not required because the project produces less than 0.1 cfs increase in the 100-year flow. **Note that this analysis does not account for flow attenuation by roof runoff disbursed to native vegetation. r C-1 Federal Way Regional Library KPFF #107494 January 13, 2009 Existing Peak Calculations: Flow Frequency Analysis Time Series File:exist.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Frequency Analysis Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.033 4 2/09/01 2:00 0.077 1 100.00 0.990 0.017 7 1/05/02 16:00 0.042 2 25.00 0.960 0.042 2 2/27/03 7:00 0.033 3 10.00 0.900 0.007 8 3/24/04 19:00 0.033 4 5.00 0.800 0.018 6 1/05/05 8:00 0.030 5 3.00 0.667 0.033 3 1/18/06 16:00 0.018 6 2.00 0.500 0.030 5 11/24/06 3:00 0.017 7 1.30 0.231 0.077 1 1/09/08 6:00 0.007 8 1.10 0.091 Computed Peaks 0.065 50.00 0.980 Proposed Peak Calculations: Flow Frequency Analysis Time Series File:proposed.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Frequency Analysis Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob (CFS) (CFS) Period 0.089 7 2/09/01 2:00 0.172 1 100.00 0.990 0.078 8 1/05/02 16:00 0.132 2 25.00 0.960 0.108 3 12/08/02 18:00 0.108 3 10.00 0.900 0.091 6 8/26/04 2:00 0.108 4 5.00 0.800 0.108 4 10/28/04 16:00 0.095 5 3.00 0.667 0.095 5 1/18/06 16:00 0.091 6 2.00 0.500 0.132 2 10/26/06 0:00 0.089 7 1.30 0.231 0.172 1 1/09/08 6:00 0.078 8 1.10 0.091 Computed Peaks C-2 s,0114 t Appendix D Figures D-1 Original Conveyance Calculations Federal Way Regional Library Stormwater TIR Appendix D 0 ! 011o12 �-Q In C.4 ., NN NNN-t -70 7p 9 ,0.- Nw..m ])O - WACA0+0 N . -1' m -i r to -Q 21N NNNN N- 0 .er•. 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