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! B-13 B-12
! B-3
!
1
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M W-3
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i
MW 21
B--4
MW-1
TEMPORARY
SHORING
j ;CLOSED -IN -PLACE
� B-9 � ''UST (rtornovej-0�
B-7
B-3
Work Sequence
1. Install TESC measures.
2. Sawcut and Remove Asphalt in Excavation Limits
k 3. Excavate Soils from Method B limits and haul to approved contaminated
�_� waste site.
!� 4. Backfill excavation with clean imported structural fill. Compact to 95%.
o
�,.
5. Restore asphalt, curbs, concrete to original condition.
! 6. Remove TESC Measures.
.�..�.. ! B_5
! B-6
!
!
! APPROXIMATE
Lim100
EXCAVATION
! B-11
!
LIMITS
.fto anift _ 0 �. 0 — ._ -� B-6
1 / 5ir#-W1WA^a%l4.
B
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1
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CM
REFERENCES: (1) Remedial Investigation, Prepared by Aerotech, Dated February 2, 2018 (2) King County Assessor Parcel Viewer: (3) ZGA Field Measurements
S0
ZGA BORING - Petroleum hydrocarbons not
detected above MICA A cleanup levels.
ZGA BORING - Petroleum hydrocarbons
detected above MTCA method A cleanup levels
but not exceeding MTCA Method B cleanup
level.
ZGA BORING - Petroleum hydrocarbons
detected above MTCA Method B cleanup level.
AEROTECH BORING - Petroleum
hydrocarbons not detected above MTCA
method A cleanup levels.
AEROTECH BORING - Petroleum
hydrocarbons detected above MICA Method B
cleanup level.
Exceeds site -specific MTCA method B cleanup
levels of 2,151 parts per million for cumulative
total petroleum hydrocarbons.
Exceeds MTCA method A cleanup levels for
gasoline, diesel or oil -range petroleum
hydrocarbos, but below site specific method B
cleanup level.
----- Approximate property boundary.
A A'
+I - CROSS SECTION A -A' (FIGURE 3)
B' B'
- CROSS SECTION B-B' (FIGURE 4)
Estimated lateral extents of petroleum contaminated soil were
established based on a review of available laboratory data
compared to Method A cleanup standards for unrestricted land
use established under Chapter 70.105D RCW and its
implementing regulations, the Model Toxics Control Act
(MTCA), chapter 173-340 WAC.
A.
Confirmation soil sample locations.
APC T /
10 _ 0 5 10
SCALE IN FEET
BUCKY'S COMPLETE AUTO CARE
30924 Pacific Highway South
Federal Way, Washington
REMDIAL EXCAVATION PLAN
FOR METHOD B CLEAN UP
GATE; MAY 2018 Job No. 1973.22
Zipper Gear Associates, LLC FIGURE
19019 36th Ave. W., Suite E C-1
Lynnwood, WA SHT.1 of 1
RECEIVED
MAY 16 2019
CITY OF FEDERAL WAY
COMMUNITY DEVELOPMENT
H
w 5
w
LL
w10
U
Q
=15
20
:D
o .
025
3:
w 30
m
a 35
w
0
me
LEGEND
E5.1.
<
<50
<250
REMEDIAL
EXCAVATION LIMIT
B-13 MW-3 B-9 B-7 MW-1 B-3 B-8 B-6 B-1 1 MW-4
OFFSET OFFSET (OFFSET (OFFSET (OFFSET (OFFSET (OFFSET (OFFSET (OFFSET (OFFSET
5.5' E) 5' W) 9' E) 3' W) 7' W} 5' E) 5' E) 14' E) 5 E) 18 W)
t
1 } ;
ff <5 <5
<50 <50 2,800 890 150
�2,250 5,600 2,000
<250 <250 I <250 <250
t
NA <5
<5 <5 760 140
<50
<50 3,200 1 <250 <50 <5 <250 <250 130 1 NA <250
<250
�_ A 1 <25 <5
<50 67 ,200 c'900 j <250 <50 <5
<5 <250 750 NA 250 1
<250 <250 <50
2,100
<5 <250
<50 <50 <250 NA <250
<250 <250 NA 00 NA <50 <5
<50 <50 <250 <50
7
130
<250 <250
<250 100 NA
NA <250 <50 (5-1-2018)
<5 (5-1-2018) <50 <250
e.250 \ "
<50 (5-1-2018) 630
<250 3,900 NA <5 <5
<5 <250 <5 <50 <50 <50
<2550fi
<5<50 <250 <250 <250
<250
<5
<50
<250
(5-1-2018) LL
<0.35 -
<100
<20
<350
I ___" V
0 10 20 30 40 "':a35' 50 60 70 80
<1oo
�35 0 DISTANCE IN FEET
CONFIRMATION SOIL SAMPLE LOCATIONS.
8
---- GROUND WATER LEVEL AT DATE NOTED
EXCEEDS SITE -SPECIFIC MICA
METHOD B CLEANUP LEVEL OF
2,153 PARTS PER MILLION FOR
COMULATIVE TOTAL PETROLEUM
HYDROCARBONS
EXCEEDS MTCA METHOD A
CLEANUP LEVELS FOR GASOLINE,
DIESEL OR OIL -RANGE
PETROLEUM HYDROCARBONS,
BUT BELOW SITE SPECIFIC
METHOD B
V(5-1-2018)
<0.35
<100
<20
<350
H
w
5
w
U.
-10
W
a
-15
-20
z
0
- 25
�
0
J
-30
m
- 35
W
0
90 100 110
TPH-G - GASOLINE -RANGE TPH
TPH-D - DIESEL RANGE TPH
TPH-O OIL -RANGE TPH
TPH - TOTAL PETROLEOM HYDROCARBONS
NA - NOT ANALYZED
SOIL ANALYTICAL RESULTS
<5 TPH-G
<50 TPH-D
<250 TPH-0
CONCENTRATION OF TPH IN SOIL IN PARTS
PER MILLION
EFERENCES: (1) Remedial Investigation, Prepared by Aerotech, Dated February 2, 2018 (2) King County Assessor Parcel Viewer: (3) ZGA Field Measurements
GROUNDWATER ANALYTICAL RESULTS
BENZENE
<0.35
TPH-G
<100
TPH-D
<20
TPH-O
<350
CONCENTRATION OF TPH IN
GROUNDWATER IN PARTS PER BILLION
10 0 5 10
SCALE IN FEET
BUCKY'S COMPLETE AUTO CARE
30924 Pacific Highway South
Federal Way, Washington
CROSS SECTION A A'
GATE: MAY 2018 Job No. 1973.22
Zipper Geo Associates, LLC FIGURE
19019 36th Ave. W., Suite E C-21
Lynnwood, WA SHT.1 of 1
U.
r�
W
LEGEND
(S-4
<5
<50
<250
15
_w�
m
30
35
REMEDIAL
EXCAVATION LIMIT
(OFFSET
2' N)
SHORING
(OFFSET
4')
(OFFSET
3 1 /2' S)
(OFFSET
18' N)
R
6i
im
iR
25
30
(5-1-2018) w <0.35 . 35
<100
<20
<350
(5-1-2018) TI
40
<0.35 <100
<20
<20
<350 45
0 10 20 30 40 50 60 70 80 90 100 110
CONFIRMATION SOIL SAMPLE LOCATIONS.
GROUND WATER LEVEL AT DATE NOTED
-am--SOIL SAMPLE
DISTANCE IN FEET
EXCEEDS SITE -SPECIFIC MTCA
METHOD B CLEANUP LEVEL OF
2,153 PARTS PER MILLION FOR
COMULATIVE TOTAL PETROLEUM
HYDROCARBONS
EXCEEDS MTCA METHOD A
CLEANUP LEVELS FOR GASOLINE,
AIM DIESEL OR OIL -RANGE
PETROLEUM HYDROCARBONS,
BUT BELOW SITE SPECIFIC
METHOD B
TPH-G - GASOLINE -RANGE TPH
TPH-D - DIESEL RANGE TPH
TPH-0 - OIL -RANGE TPH
TPH -TOTAL PETROLEOM HYDROCARBONS
NA - NOT ANALYZED
SOIL ANALYTICAL RESULTS
I—
W
w
UL
z
i
j'-
CL
LU
0
GROUNDWATER ANALYTICAL RESULTS
BENZENE <0.35 10 4 5 10
TPH-G <100 SCALE IN FEET
TPH-D <20
TPH-O <350 BUCKY''S COMPLETE AUTO CARE
<5 TPH-G CONCENTRATION OF TPH IN
<50 TPH-D GROUNDWATER IN PARTS PER BILLION
<250 TPH-0
CONCENTRATION OF TPH IN SOIL IN PARTS
PER MILLION
ERENCES: (1) Remedial Investigation, Prepared by Aerotech, Dated February 2, 2018 (2) King County Assessor Parcel Viewer: (3) ZGA Field Measurements