HomeMy WebLinkAbout4050 GOSFORD ROAD (32)SITE ASSESSMENT AND REMEDIATION TEST
WORK PLAN
At
Texaco Service Station
4050 Gosford Road
Bakersfield, California
January 28, 2003
for
Mr. Tony Palagyi
Shell Oil Products US
P.O. Box 7869
Burbank, CA. 91510 -7869
PMmred by:
WGIR,
Southwest, Inc.
11021 Winners Circle, Suite 101
Los Alamitos, CA 90720
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Southwest, Inc.
January 28, 2003
City ofBakersfield Fire Department
Environmental Services
1715 Chester Avenue, 3`d Floor
Bakersfield, CA 93301
Attn: Mr. Howard H Wines III
SUBJECT: SITE ASSESSMENT AND REMEDIATION TEST WORKPLAN
TEXACO SERVICE STATION
4050 Gosford Road
Bakersfield, California
WGR Southwest, Inc., Project No. 423.EQL.00
Dear Mr. Wines:
WGR Southwest, Inc., on behalf of Equilon Enterprises LLC dba Shell Oil Products US is forwarding
this attached Site Assessment and Remediation Test Workplan for the above referenced site. If you
have any questions, please do not hesitate to call me at (562) 799 -8510 or Mr. Tony Palagyi,
Environmental Engineer, Shell Oil Products US at (425) 377 -8530. zoz-
Sincerely,
WGR Southwest, Inc.
David A. ' iams, RG
Project Manager
Enc.
Cc Mr. Tony Palagyi, Shell Oil Products US
11021 Winners Circle, Suite 101 • Los Alamitos, CA 90720 (562) 799 -8510 • Fax (562) 799 -8556
Los Alamitos, CA • Bothell, WA Lodi, CA
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SITE ASSESSMENT AND REMEDIATION TEST
WORK PLAN
At
Texaco Service Station
4050 Gosford Road
Bakersfield, California
January 28, 2003
for
Mr. Tony Palagyi
Shell Oil Products US
P.O. Box 7869
Burbank, CA. 91510 -7869
prepared by:
W GIK
Southwest, l[rnc.
11021 Winners Circle, Suite 101
Los Alamitos, CA 90720
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TABLE OF CONTENTS
1.0 INTRODUCTION .................................................................................................................. ..............................1
2.0 SITE BACKGROUND ........................................................................................................... ..............................1
3.0 SITE GEOLOGY AND HYDROGEOLOGY ...................................................................... ..............................2
4.0 PROPOSED FIELD ACTIVITIES ....................................................................................... ..............................3
4.1 SOIL BORINGS .................................................................................................................. ............................... 3
4.2 SOIL SAMPLING AND ANALYSIS ................................................................................... ..............................4
4.3 POTENTIAL WELL INSTALLATIONS ............................................................................. ..............................4
5.0 FIELD TESTING AND SYSTEM DESIGN ........................................................................ ............................... 5
6.0 HEALTH AND SAFETY PLAN ........................................................................................... ..............................5
7.0 DRILL SITE CLEARANCE ................................................................................................. ..............................6
8.0 DISPOSITION OF DRILL CUTTINGS AND WASTEWATER ....................................... ..............................6
9.0 ASSESSMENT REPORT ..................................................................................................... ............................... 6
FIGURES
FIGURE 1: Site Vicinity Map
FIGURE 2: Site Plan with Previous/Proposed Boring Locations
FIGURE 3: Generalized Well Construction Diagram
TABLE 1:
TABLE 2:
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423.EQL.00
TABLES
Summary of Previous Soil Borings and Soil Sampling
Summary of Previous Soil Boring Investigation Sampling
January 28, 2003
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SITE ASSESSMENT WORK PLAN
TEXACO SERVICE STATION
4050 Gosford Road at White Lane
Bakersfield, California
1.0 INTRODUCTION
The subject property, located at 4050 Gosford Road in the City of Bakersfield, California, is the
location of a Texaco gasoline station. The subject property is located on the northeast corner of
the intersection of Gosford Road and White Lane in Bakersfield, California (Figure 1). The site is
located in a commercial and residential district of Bakersfield. A shopping center is directly
adjacent to the north and east of the subject property; White Lane followed by a Unocal 76 service
station are located to the south of the subject site; Gosford Road followed by residential housing are
located to the south.
A gasoline station occupies the subject property selling gasoline and diesel fuels. The subject
property consists of a station building, overhead canopy structure, a carwash, two dispenser
islands each equipped with two multi - product dispenser pumps, three 10,000 gallon and on
12,000 gallon double -wall fiberglass gasoline underground storage tanks (USTs), and associated
piping. A site plan of the station layout is shown as Figure 2.
2.0 SITE BACKGROUND
On January 19, 2000, Pacific Environmental Group (PEG) conducted a Phase H environmental
assessment as the subject site. Six soil borings were advanced to depths of20 to 40 feet below
surface grade (BSG). Soil analytical results revealed low -level hydrocarbon impact near the
UST's and northwest dispenser island (soil borings BB -1, BB -2, and BB -6). Results ofthe soil
analysis are summarized in Table 1. Boring locations are shown on Figure 2.
On July 5, 2001, IT conducted soil sampling beneath the product piping and dispensers during
station upgrade activities. Total petroleum hydrocarbons as gasoline and diesel (TPH -g and
TPH -d) were detected in soil beneath the product piping in sample locations P -1 and P -2 and
dispenser D -1, at concentrations ranging from 0.78 mg/kg to 210 mg/kg. Methyl tert-butyl ether
MTBE) was detected in soil beneath all product piping and dispenser sample locations, except
D -2, at concentrations ranging from 0.011 mg/kg to 13 mg/kg.
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On July 17, 2001, IT returned to the site to supervise limited impacted soil overexcavation.
Approximately 50 cubic yards of soil was removed from product piping areas P -1 and P -2 and
dispenser D -1. Confirmation soil samples were collected from the bottom and sidewalls of the
excavations. TPH -g and MTBE were detected in all confirmation soil samples collected from P -1
and P -2. TPH -g concentrations ranged from 3.5 mg/kg to 7.9 mg/kg and MTBE concentrations
ranged from 6.1 mg/kg to 16 mg/kg, by EPA Method 8260B. TPH -g concentrations were not
detected in confirmation soil samples collected from D -1. MTBE concentrations were detected in
the confirmation soil samples collected from D -1 at 0.014 mg/kg and 0.0088 mg/kg. Results of the
Isoil analysis are summarized in Table 1. Soil sample locations are shown on Figure 2.
On June 20 -21, 2002, WGR Southwest, Inc. conducted a site assessment to more fully define the
vertical and lateral extent of the petroleum hydrocarbons beneath the site. The assessment
consisted of advancing six soil borings (BB -7 through BB -12) to a depth of 60 feet to 65 feet bgs.
Detectable TPH -g was identified in borings BB -7, BB -8, BB -9, BB -10, BB -11, and BB -12 ranging
in concentration from 0.068 mg/kg to 12 mg/kg. Detectable TPH -d was identified in boring BB -9
ranging in concentration from 2 mg/kg to 4.6 mg/kg. Detectable benzene concentrations were not
identified in any of the borings. Detectable MTBE was identified in borings BB -7, BB -8, BB -9,
BB -10, BB -11, and BB -12 ranging in concentration from 5 µg/kg to 16,000 µg/kg. Results of the
soil analysis are summarized in Table 2. Boring locations are shown on Figure 2.
3.0 SITE GEOLOGY AND HYDROGEOLOGY
The geologic conditions in the site vicinity are characterized from alluvial deposits underlain by
marine and non -marine sedimentary units, metamorphic rocks, and crystalline basement material.
Surface and near - surface conditions is designated by the U.S. Geological Survey (USGS) as older
alluvium, deposited in northwest - dipping alluvial fans resulting from outwash from the Sierra
Nevada mountain range to the east. This alluvium is composed primarily of poorly graded and
unconsolidated sands, sandy gravels, and occasional discontinuous lenticular bodies of sandy clay
and silt. Regionally, the surface of these old alluvial fans in undulatory, with a distinct dip toward
the Kern River to the northwest of the site. The site itself is located along one of the crests of the
alluvial fan surface `ripples', at an elevation of approximately 390 feet above mean sea level
MSL). The total thickness of the alluvial fan deposits is estimated to range from approximately
600 feet west of the site to over 4,000 feet near the Sierra Nevada Mountains.
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The site lies within the Edison hydrogeologic sub -area of the Edison - Maricopa area. Uppermost
groundwater within this area occurs within the old alluvial fan deposits. In the site vicinity, deeper
aquifers of limited areal extent are present in the consolidated non - marine sedimentary units and
within fracture zones of the crystalline basement rock. The most prominent subsurface features
controlling the groundwater flow direction are the groundwater barriers formed by the northwest -to-
southwest trending Edison Fault and subparallel splays of this fault, located south and north of the
site, respectively.
According to the records at the Kern County Water Agency, depth to groundwater measurements in
the vicinity of the subject site taken in October of 2002 were approximately 160 feet below grade
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surface (bgs).
4.0 PROPOSED FIELD ACTIVITIES
4.1 SOIL BORINGS
WGR Southwest, Inc. proposes to advance 8 soil borings on the subject property in areas of
previously identified hydrocarbon impact adjacent to the former UST and former product dispenser
islands to complete delineation of impacted soil. Proposed boring locations are shown in Figure 2.
The borings will be drilled vertically to minimum depths of 85 feet bgs or until four consecutive
soil samples contain no detectable hydrocarbon or oxygenate concentrations (if possible). If
groundwater is encountered, a selected number of soil borings may be converted to groundwater
monitoring wells. Selected soil borings will also be converted to vapor extraction wells. Well
construction details are described in a later section of this report.
The soil borings will be advanced vertically utilizing a CME-85 or equivalent drilling rig equipped
with 6 to 8 -inch outer diameter (O.D.) hollow -stem augers. Pre- cleaned augers will be used
throughout the drilling operation to prevent potential cross contamination. The work will be
performed under the supervision of a California Registered Geologist.
If hydrocarbon impact is delineated with four consecutive 5 -foot samples of non - detectable
hydrocarbons/oxygenates and groundwater is not encountered, the soil borings will be backfilled
using a hydrated bentonite grout from the ground surface to the total depth of each boring or
converted to a vapor extraction well.
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4.2 SOIL SAMPLING AND ANALYSIS
Undisturbed soil samples will be collected for analyses at 5 -foot depth intervals from the borings
and submitted for analyses. Soil will be initially collected using a continuous core sampler or an
18 -inch long, 2.5 -inch O. D. split -spoon sampler lined with 2 -inch O. D. metal sample sleeves.
Following collection, each end of the metal sleeve will be sealed with Teflon and a plastic end cap.
The samples will then be labeled with all pertinent sampling information and packed on ice for
subsequent delivery to a California Department of Health Services (DHS)- certified laboratory for
analyses.
Soil samples will be screened for hydrocarbon vapors with a portable organic vapor analyzer
OVA) and described and logged by the field geologist in accordance with the Unified Soil
Classification System (USCS). At least two ofthe soil borings will be continuously cored to obtain
a detailed lithologic profile of the soil column. Sampling equipment will be decontaminated
between sampling episodes utilizing a triple rinse method consisting of a wash with Alconox (or
equivalent) solution, an initial rinse with tap water, and a final rinse with distilled water. Following
collection, all samples submitted for analyses will be submiitted immediately to an onsite mobile
laboratory or stored in a cooler with ice and delivered to a State - certified laboratory using chain -of-
custody forms.
Each of the samples will be analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA
method 8015M and for BTEX, MTBE and oxygenates (TBA, DIPE, ETBE, and TAME) by EPA
Method 8260B.
4.3 POTENTIAL WELL INSTALLATIONS
If groundwater is encountered during drilling of the proposed soil borings, selected borings will
be converted to groundwater monitoring wells. If groundwater is not encountered, but it is
determined in the field that a vapor extraction well is needed, selected borings will be converted
to vapor extraction wells. Wells will be constructed with two -inch diameter schedule 40 PVC
well casing. Groundwater monitoring wells will be screened from a minimum of 10 feet above
to 15 feet below the static water level (if encountered) as indicated by measurements conducted
during drilling activities. Following installation of the well casing, Number 3 Monterey sand
will be installed within the annular space between the borehole walls and the well casing from
the bottom of the borehole to a depth of approximately 3 feet above the top of the well screen.
Following installation of the filter sand the well will be developed by surge blocking. Following
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well development, additional sand will be added as needed to insure the sand pack is installed aPP
minimum of three feet above the top of the screened interval. A three -foot hydrated bentonite
chip seal will then be installed in the annular space above the sand pack followed by bentonite
grout which will be installed to approximately 1 feet below ground surface. The wells will be
completed at the surface with 12 -inch diameter well boxes encased in concrete. Well construction
details for groundwater monitoring wells are shown in Figure 3. Appropriate groundwater
monitoring well permits will be obtained from the Los Angeles County Department of
Environmental Health.
5.0 FIELD TESTING AND SYSTEM DESIGN
Vapor extraction testing will be conducted after the proposed site assessment activities are
completed and vapor extraction wells are installed. Data collected during the test and analytical
results will be utilized to determine radial influence zones, remediation well spacing and design,
overall system and individual well flow rates, anticipated influent concentrations and system
discharge rates.
A vapor extraction system capable of effecting at least 250 standard cubic feet per minute (SCFW
will be utilized for the vapor test. The system will be operated at various flow rates from low to
high throughout the test on at least two existing wells. Vacuum gauges will be installed in adjacent
wells (and/or vapor probes) and monitored throughout the test(s) to determine the effective radial
influence distance. Additionally system influent concentrations (as measured by PID) and flow rate
data will be collected. Tedlar bag samples will also be collected during the test to confirm vapor
concentrations measured by the PID.
6.0 HEALTH AND SAFETY PLAN
A site specific Health and Safety Plan detailing known or potential hazards and emergency
response procedures will be prepared prior to field operations. All on -site personnel will review
the plan and conduct a "tailgate" safety meeting prior to initiation of field activities. The safety
plan will be maintained on -site throughout the duration of field activities. The plan will be
modified if warranted due to on -site conditions.
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7.0 DRILL SITE CLEARANCE
Prior to the initiation of field operations, the drilling locations will be marked in white paint and
Underground Service Alert (USA) will be contacted to identify any potential subsurface
obstructions and/or conflicts. In order to further insure that no underground utilities or
obstructions exist at the proposed drilling locations, a geophysical survey will be conducted and
the initial 5 feet of drilling will be conducted utilizing hand auger techniques. Adjustments to the
proposed surface locations may be required based on the results of the USA survey, the
geophysical survey, or hand auguring.
8.0 DISPOSITION OF DRILL CUTTINGS AND WASTEWATER
The drill cuttings generated during the drilling operation and any wastewater generated by
decontamination procedures will be stored on -site in 55- gallon DOT - approved steel drums pending
waste characterization. Each drum will be labeled with the site name and address, generation date,
and type and source of the material it contains. Within 60 days of the generation date, the drummed
soil and water will be transported to an appropriate facility for disposal.
9.0 ASSESSMENT REPORT
Upon completion of field activities, a report documenting the fieldwork will be submitted. The
report will include a detailed description of the field activities, a summary of the analytical data,
analytical reports with QA/QC documentation, soil boring logs, investigation findings and
conclusions, and recommendations for closure (if conditions are appropriate).
Respectfully submitted,
WGR Southwest, Inc.
Prepared by:
Ryan Nunneley, Staff S ientist
ED Gib
Approved by: W /4G J n,
x.4342` `
CA Registered Geologist No.
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FIGURES
I423.EQL.00 January 28, 2003
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Site Location
dK Shell Oil Products US Figure
Site Vicinity Map
Southwest, Inc. 4050 Gosford Road Bakersfield, CA
11021 Winners Circle, cle' 9 suite 'ol DATE 7 PROJECT NUMBER DWN BY I DWG #
Alamitos, 0120 01/28/03 1 423.E L.00 I JGM
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Site Location
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Site Vicinity Map
Southwest, Inc. 4050 Gosford Road Bakersfield, CA
11021 Winners Circle, cle' 9 suite 'ol DATE 7 PROJECT NUMBER DWN BY I DWG #
Alamitos, 0120 01/28/03 1 423.E L.00 I JGM
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WHITE LANE
Legend
O PREVI US B RING LOCATION (6/20- 21/02)
O PREVIOUS BORING LOCATION (1/19/00)
x PREVIOUS SOIL SAMPLE LOCATION (7/5/01 and 7/17/01)
PROPOSED BORING LOCATION I
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FEET
SHELL OIL PRODUCTS US Figure
SITE PLAN 2
Inc. 4050 Gosford Road Bakersfield, CAL . salte Im DATE PROJECT NUMBER DWN BY DWG
01/28/03 423.EQL.00 RDN
m = = = = = = = = = = = = = =
12" HEAVY DUTY ROUND TRAFFIC C LOCKING CAP
SLOPE AWAY FROM
TOP OF MANHOLE 36- SQUARE TRAFFIC PAD
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SCHEDULE 40 PVC BLANK
CASING, 0-145'
V WATER TABLE
APPROX. 160' BSG
3 MONTEREY SAND, 140-175'
4" SCHEDULE 40 PVC 0.020" 101 • • I SLOTTED CASING, 145-175'
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TOTAL DEPTH 175' A-lk - - '
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TABLES
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Table 1
Historical Soil Analytical Results
4050 Gosford Road
Bakersfield, California
IT Project No. 829246
n:\data\project\705-equiva\Gosford-160\829246\Table 1 1215/0)
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BB-1 1/19/00
5 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) 1.9 NA NA NA NA NA
10 MD ( <l .0) 5.6 NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) 2.3 NA NA NA NA NA
is ND (<2.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) 7.9 8.1 NA NA NA NA
20 ND (<1.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) 1.7 NA NA NA NA NA
25 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) 0.36 NA NA NA NA NA
35 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) 0.28 NA NA NA NA NA
40 ND (<I.0) ND (<5.0) NA ND (<0-0050) ND (<0.0050) ND (<0.0050) ND (<O.O15) 2.8 NA NA NA NA NA
BB-2 1/19/00
5 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) 0.76 NA NA NA NA NA
10 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<O.0050) ND (<0.0050) ND (<0.015) 19 NA NA NA NA NA
15 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (40.0050) ND (<0.0050) ND (<0.015) 42 NA NA NA NA NA
20 ND (<1.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) 51 27 NA NA NA NA
25 MD ( <I.0) I I NA ND (<0.0050) ND (<0.0050) ND (41.0050) ND (<O.015) 6.7 NA NA NA NA NA
30 ND ( <1.0) ND (<S.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND ( <0.015) 0.15 NA NA NA NA NA
35 ND (<LO) 7 NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) 10 NA NA NA NA NA
40 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) 0.14 NA NA NA NA NA
BB-3 1/19/00
5 ND (<I.0) ND (<5.0) NA ND (41.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) ND (<0.035) NA NA NA NA NA
10 ND (<].0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) ND (<0.035) NA NA NA NA NA
15 ND (<].0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) ND (<0.035) NA NA NA NA NA
20 ND (<I.0) ND (<5.0) NA ND <0.0050 ND <0.0050) ND (<0.0050) ND (<O.O15) ND,(<0.035) NA NA NA NA NA
BB-4 1/19/00
5 ND (<1.0) ND (<5.0) NA ND (<0.0050) ND (<0-0050) ND (<0.0050) ND (<0.015) ND (<0.035) NA NA NA NA NA
10 ND (<1.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) ND (<0.035) NA NA NA NA NA
15 ND (<I.0) ND (<5.0) NA ND (<O.0050) ND (<0.0050) ND (<0.0050) ND (<O.015) ND (<0.035) NA NA NA NA NA
20 ND (<1.0) ND (<S.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND <0.015) ND (<0.035) NA NA NA NA NA
BB-5 1/19/00
5 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0-0050) ND (<0.0050) ND (<O.015) ND (<0.035) NA NA NA NA NA
10 ND ( <1.0) ND (<5.0) NA ND (<0.0050) ND (-10.0050) ND (<0.0050) ND (<0.015) ND (<0.035) NA NA NA NA NA
15 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) ND (<0.035) NA NA NA NA NA
20 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.015 ND (<0.035) NA NA NA NA NA
IT Project No. 829246
n:\data\project\705-equiva\Gosford-160\829246\Table 1 1215/0)
m m®®® m m m m m m m® e m r m m m
Table 1
Historical Soil Analytical Results
4050 Gosford Road
Bakersfield, California
IT Project NO: 829246
n:\data\ project \705-equiva\Gosford - 160\829246 \Table 1 12/5/01
1313-6 1/19/00
5 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) ND (<0.035) NA NA NA NA NA
10 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) ND (<0.035) NA NA NA NA NA
15 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<0.015) ND (<0.035) NA NA NA NA NA
20 ND (<I.0) ND (<5.0) NA ND (<0.0050) ND (<0.0050) ND (<0.0050) ND (<O.O15) 0.039 0.039 NA NA NA NA
Dispenser Samples
D-1-4 . 7/5/01 10 210 NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 0.017 ND(0.25) ND(0.010) ND(0.010) ND(0.010)
D-1-8 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA ND(0.0050) ND(0.25) ND(0.010) ND(0.010) ND(0.010)
D-24 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA TOX0.0050) ND(0.25) ND(O.010) ND(0.010) ND(0.010)
D-2-8 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA ND(0.0050) ND(0.25) ND(0.010) ND(0.010) ND(0.010)
D-3-4 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 0.29 ND(0.25) ND(0.010) ND(0.010) ND(0.010)
D-3-8 7/5/01 ND(0.5) ND(5-0) NA ND(0.0050). ND(0.0050) ND(0.0050) ND(0.010) NA 0.041 ND(0.25) ND(0.010) ND(0.010) ND(0.010)
D44 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0-0050) ND(0.010) NA 0.028 ND(0.25) Nf)(0.010) ND(0.010) ND(0.010)
D4-8 7/5/01 ND(O.5) ND(5.0) NA ND 0.0050 ND(0.0050) ND(O.0050) ND 0.010 NA ND 0.25 ND(0.25) ND 0.010 ND(O.010 ND 0.010
Piping Samples
P-1-4 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0056) ND(0.0050) ND(0.010) NA 0.96 0.94 ND(0.010) ND(0.010) ND(0.010)
P-1-8 7/5/01 0.78 ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 2.4 6.5 ND(0.0 10) ND(0.010) ND(0.010)
P-1-10 7/5/01 2.80 ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA ND(0.0050) 1.9 ND(0.010) ND(0.010) ND(0.010)
P-1-12 7/5/01 1.10 ND(5.0) NA ND(0.0050) ND(0.0050) ND(0-0050) ND(0.010) NA 13 2.1 ND(0.010) ND(0.010) ND(0.010)
P-1-14 7/5/01 ND(0.5) ND(5.0) NA W0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 2.7 1.3 ND(0.010) ND(0.0 10) ND(0.010)
P-24 7/5/01 W0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 0.2 3.9 ND(0.010) ND(0.010) ND(0.010)
P-2-8 7/5/01 4.3 ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 8.2 ND(6.3)• ND(0.010) ND(0.0 10) ND(0.010)
P-2-10 7/5/01 2.6 31 NA ND(0.0050) 0.055 0.024 0.223 NA 2.7 4.5 ND(0.010) ND(0.010) ND(0.010)
P-3-4 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0-0050) ND(0.0050) ND(0.010) NA 0.02 ND(0.25) ND(0.010) ND(0.010) ND(0.010)
P-3-8 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 0:017 ND(0.25) ND(0.010) ND(0.010) ND(0.010)
P-4-4 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA 0.012 ND(0.25) ND(0.010) ND(0.010) ND(0.010)
P-4-8 7/5/01 ND(0.5) ND(5.0) NA ND(0.0050) ND 0.0050 ND 0.0050 ND 0.010 NA 0.011 ND(O.25) ND 0.010 ND 0.010 ND(O.010)
IT Project NO: 829246
n:\data\ project \705-equiva\Gosford - 160\829246 \Table 1 12/5/01
m m ® ® ® m m m m m ® ® = m m
Table 1
Historical Soil Analytical Results
4050 Gosford Road
Bakersfield, California
e.
Over-Excavation Samples
D-1-10 7/17101 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) ND(0.025) NA NA NA NA NA
D-I-NSIO 7/17/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) 0.026 0.014 NA NA NA NA
D-1-WS10 7/17/01 ND(0.5) ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) 0.042 0.0088 NA NA NA NA
P -1 -20 7/17/01 3.5 ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) 4.4 6.1 NA NA NA NA
P-1 -WS20 7/17/01 5.8 ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) 6.5 9.9 NA NA NA NA
P-1-ES18 7/17/01 3.8 ND(5.0) NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) 5.3 8.3 NA NA NA NA
P-2-20 7/17/01 4.3 ND(5.0) NA ND(0-0050) ND(0.0050) ND(0.0050) ND(0.010) 6.3 10 NA NA NA NA
P-2-WS20 7/17/01 7.9 ND(5.0) NA ND(0.0050) ND(0.0050) ND 0.0050 ND 0.010 10 16 NA NA NA NA
Stockpile Sam les
SP-1-A 7/5/01 ND(0.5) NA NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA NA NA NA NA NA
SP-1-B 7/5/01 15 NA NA ND(0.0050) 0.23 0.15 1.4 NA NA NA NA NA NA
SP-2-A 7/5/01 ND(0.5) NA NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA NA NA NA NA NA
SP-2-13 7/5/01 ND(0.5) NA NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0 -010) NA NA NA NA NA NA
SP-3-A 7/5/01 ND(0.5) NA NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA NA NA NA NA NA
SP-3-13 7/5/01 ND(0.5) NA NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA NA NA NA NA NA
SP-1,2A(c) 7/5/01 NA NA ND(<0.5) NA NA NA NA NA NA NA NA NA NA
SP-213,3(c) 7/5/01 NA NA ND(<0.5) NA NA NA NA NA NA NA NA NA NA
SP-4-A 7/17/01 3.3 NA NA ND(0.0050) ND(0.0050) ND(0.0050) 0.033 NA NA NA NA NA NA
SP-4-13 7117/01 1.9 NA NA ND(0.0050) 0.0091 ND(0.0050) 0.036 NA NA NA NA NA NA
SP-4-C 7/17/01 1.5 NA NA ND(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA NA NA NA NA NA
SP-4-D 7/17/01 2 NA NA N-6(0.0050) ND(0.0050) ND(0.0050) ND(0.010) NA NA NA NA NA NA
SP-4-
A,B,C,D(c) 7117/01 NA NA 2.39 NA NA NA NA NA NA NA NA NA NA
IT Project No: 829246
n:\data\pToject\705-equiva\GosfoTd-160\829246\Table 1 12/5101
mm m M= ® ® == = === = = s
Table 1
Historical Soil Analytical Results
4050 Gosford Road
Bakersfield, California
Ss k'1 4. tad ea1<' ..... .. ..`f it::iG>t>3'1zeR+e ep... IFH: 81F ..Nl«f$zQl.....A...... l! ...... l~tl'1€`A1 1
Notes:
ND = Analyte was not detected above the Laboratory Reporting Limits shown
NA = Not analyzed
na = not applicable
c) = Composite sample
TPH -g = Total Petroleum Hydrocarbons as gasoline, analyzed by EPA Method 8015M
TPH-d = Total Petroleum Hydrocarbons as diesel, analyzed by EPA Method 8015M
BTEX prior to 2001analyzed by EPA Method 8021B
MtBE = Methyl tert -Butyl Ether
DIPE = Di- isopropyl Ether
EtBE = Ethyl tert-Butyl Ether
TAME = Tert- Amyl - Methyl Ether
TBA = Tert-Butyl Alcohol
MRL is elevated because of matrix interferences and because the sample required diluting
IT Project No: 829246
n:\ data\project\705- equiva\Gosford- 160\829246 \Table 1 12/5!01
Table 2
Soil Sample Analytical Summary
Texaco Service Station
4050 Gosford Road
Bakersfield, California
Sample
Boring Sample Depth
Number Date (Feet
TPH-d
qw
TPH-g
L-
Ethyl Total
Benzene Toluene Benzene Xylenes NME
MW (WJW (WJW (pg(kg) (wkg)
Wgyliwwam WMWIMMI-I", mv$MMM; YMOMMyMMMO! WWIHM.-§I M
BB-7 06/21/02 5 ND<2 ND<0.05 ND<5 ND<5 ND<5 ND<5 16
06121102 10 ND<2 ND<0.05 ND<5 ND<5 ND<5 ND<5 6
06/21/02 15 ND<2 ND<0.05 ND<5 ND<5 ND<5 ND<5 ND<5
06/21/02 20 ND<2 ND<0.05 NIX5 NIX5 ND<5 NIX5 ND<5
06/21/02 25 ND<2 0.077 ND<5 NIX5 NIX5 ND<5 37
06/21/02 30 NDQ ND<0.05 ND<5 ND<5 NIX5 NIX5 26
06/21/02 35 ND<2 ND<0.05 NIX5 NIX5 ND<5 ND<5 ND<5
06/21/02 40 ND<2 ND<0.05 ND<5 ND<5 NIX5 NIX5 83
06/21/02 45 ND<2 ND<0.05 ND<5 NIX5 NIX5 ND<5 6
06121/02 50 ND<2 ND<0.05 ND<5 NIX5 NIX5 NIX5 11
06/21/02 55 ND<2 ND<0.05 NIX5 ND<5 NIX5 NIX5 ND<5
06/21/02 60 ND<2 0.068 ND<5 NIX5 NIX5 ND<5 12
Plow iPN90aw MKOW-VOI Jxwmymwmx I WN w1WOMMMA-UM NM4MMMQ:::::: igg wn
BB-8 06/20/02 5 ND<2 ND<0.05 NIX5 ND<5 NIX5 NIX5 8
06/20/02 10 ND<2 ND<0.05 ND<5 ND<5 NIX5 ND<5 5
06/20/02 15 ND<2 ND<0.05 ND<5 ND<5 ND<5 NIX5 ND<5
06/20/02 20 ND<2 2 ND<5 NIX5 NIX5 NIX5 1,300
06/20/02 25 ND<2 23 ND<5 ND<5 ND<5 NIX5 1,500
06/20/02 30 ND<2 0.54 ND<5 NIM ND<5 NIX5 110
06/20/02 35 ND<2 0.25 NIX5 ND<5 NIX5 ND<5 240
06/20/02 40 ND<2 033 NIX5 NIX5 NIX5 NIX5 170
06/20/02 45 ND<2 ND<0.05 ND<5 ND<5 ND<5 NIX5 17
06120102 50 ND<2 ND<0.05 ND<5 NIX5 NIX5 NIX5 12
06/20/02 55 ND<2 ND<0.05 ND<5 NIX5 ND<5 ND<5 NIX5
06/20/02 60 ND<2 ND<0.05 ND<5 NIX5 ND<5 ND<5 ND<51
BB-9 06/20/02 5 2.1 031 NIX5 NIX5 NIX5 ND<5 23
06/20/02 10 ND<2 8.5 ND<25 ND<25 ND<25 ND<25 7,300
06/20/02 15 ND<2 5.6 ND<5 ND<5 ND<5 NIM 11,000
0620/02 20 ND<2 15 ND<5 ND<5 NIX5 NIX5 16,000
0620/02 25 4.6 0.89 ND<5 ND<5 NIX5 ND<5 730
0620/02 30 ND<2 033 NIX5 ND<5 NIX5 ND<5 99
0620/02 35 2 036 ND<5 ND<5 ND<5 ND<5 15
0620/02 40 ND<2 ND<0.05 NIX5 ND<5 ND<5 NIX5 ND<5
0620/02 45 ND<2 0.66 ND<5 NIX5 ND<5 ND<5 1,400
0620/02 50 ND<2 ND<0.05 NIX5 ND<5 ND<5 NIX5 45
0620/02 55 ND<2 ND<0.05 NIX5 ND<5 ND<5 ND<5 46
0620/02 60 ND<2 ND<0.05 ND<5 ND<5 NIX5 NIX5 5
06120/02 65 ND<2 ND<0.05 ND<5 ND<5 ND<5 NIX5 53
m m ® ® ® ® m m m m m m m m ® ® m m
Table 2
Soil Sample Analytical Summary
Texaco Service Station
4050 Gosford Road
Bakersfield, California
Sample
Boring Sample Depth
Date (FeetNumber )
TPH-d
MM -
TPH-g
Ethyl Total
Benzene Toluene Benzene Xylenes MTBE
0911(g) (WAO 044W W11(g) W/W
BB-10 06/20/02 5 ND<2 ND<0.05 NIX5 NIX5 ND<5 ND<5 60
06/20/02 10 ND<2 NIX0.05 ND<5 ND<5 ND<5 ND<5 58
06/20/02 15 ND<2 NIX0.05 ND<5 ND<5 ND<5 ND<5 20
06/20/02 20 ND<2 0.086 NIX5 ND<5 ND<5 ND<5 8
06/20/02 25 ND<2 0.76 ND<5 ND<5 ND<5 ND<5 690
06/20/02 30 ND<2 ND<0.05 NIX5 ND<5 ND<5 ND<5 30
06/20/02 35 ND<2 ND<0.05 ND<5 ND<5 ND<5 ND<5 39
0620/02 40 ND<2 ND<0.05 ND<5 ND<5 ND<5 ND<5 10
0620/02 45 ND<2 0.22 ND<5 NIX5 NIX5 NIX5 410
0620/02 50 ND<2 ND<0.05 ND<5 ND<5 ND<5 NIX5 23
0620/02 55 ND<2 ND<0.05 ND<5 NIX5 ND<5 NIX5 8
0620/02 60 ND<2 ND<0.05 ND<5 NIX5 ND<5 NIX5 40
0620/02 65 ND<2 0.056 ND<5 NIX5 ND<5 ND<5 70
am"WHIMMMr m', 409"IMMMMI'M OUPPENT55 WMIM-074WR
BB-11 0620/02 5 ND<2 0.4 ND<5 ND<5 ND<5 NIX5 1,000
0620/02 1 10 ND<2 1.7 ND<5 ND<5 ND<5 ND<5 3,000
0620/02 15 ND<2 9.5 NIX5 ND<5 ND<5 ND<5 5,200
0620/02 20 ND<2 5.1 ND<5 ND<5 ND<5 ND<5 11,000
0620/02 25 ND<2 3.3 ND<5 ND<5 ND<5 ND<5 650
0620/02 30 ND<2 1.4 ND<5 ND<5 ND<5 ND<5 140
0620/02 35 ND<2 ND<0.05 NIX5 NIX5 ND<5 ND<5 8
0620/02 40 ND<2 0.18 ND<5 ND<5 ND<5 ND<5 11
0620/02 45 ND<2 0.13 ND<5 ND<5 ND<5 ND<5 10
0620/02 50 ND<2 ND<0.05 ND<5 ND<5 ND<5 ND<5 20
0620/02 55 ND<2 ND<0.05 ND<5 ND<5 NIX5 ND<5 23
0620/02 60 ND<2 0.18 ND<5 ND<5 ND<5 ND<5 ND<5
MUM "-;Z"jMMwR*MP
BB-12 0620/02 5 ND<2 ND<0.05 NIX5 NIX5 NIX5 ND<5 ND<5
0620/02 10 ND<2 ND<0.05 NIM ND<5 NIX5 ND<5 10
0620/02 is ND<2 ND<0.05 ND<5 NIX5 NIX5 ND<5 22
0620/02 20 ND<2 ND<0.05 NIX5 ND<5 ND<5 NIX5 ND<5
0620/02 25 ND<2 2.9 ND<5 ND<5 NIX5 ND<5 510
0620/02 30 ND<2 ND<0.05 NIX5 NIX5 ND<5 ND<5 6
0620/02 35 ND<2 0.24 ND<5 ND<5 NIX5 ND<5 32
0620/02 40 ND<2 12 ND<5 ND<5 ND<5 ND<5 1,300
0620/02 45 ND<2 0.86 ND<5 ND<5 ND<5 ND<5 850
0620/02 50 ND<2 0.15 NIX5, NIX5 ND<5 ND<5 300
0620/02 55 ND<2 ND<0.05 ND<5 NIX5 ND<5 ND<5 33
0620/02 60 ND<2 0.081 NIX5 ND<5 NIX5 ND<5 120
m ® ® ® ® iii m m = m m m m m m