HomeMy WebLinkAboutMITIGATION 6/25/2002
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Southwest, Inc.
June 25, 2002
Mr. Howard H. Wines, III
City of Bakersfield Fire Department
Environmental Services
1715 Chester Avenue, 3rd Floor
Bakersfield, CA 93301
SUBJECT: SITE ASSESSMENT WORK PLAN
Former Texaco Station
2601 White Lane
Bakersfield, CA
Dear Mr. Wines,
On behalf of Shell Oil Products US, WGR Southwest, Inc., is submitting the attached
workplan for the above referenced site outlining proposed investigative activities.
Should you have any questions, please contact me at (562) 799-8510 or Ed Paden, Project
Coordinator, Shell Oil Products US at (310) 816-2075
Respectfully,
WGR SoutbWest,. ~c1 !
) (juJ!A
David A.li~amS, Project Manager
California Registered Geologist No. 4842
Enc.
cc: Ed Paden, Shell Oil Products US
Larry Turner, Shell Oil Products US
Yogendra & Tatendra Solanki
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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
WORK PLAN
At
Former Texaco Service Station
2601 White Lane
Bakersfield, California
June 25,2002
for
Shell Oil Products US
Mr. Edward Paden
Shell Oil Products US
P.O. Box 7869
Burbank, CA 91510-7869
Prepared by:
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Southwest, Inc.
11021 Wmners Circle, Suite 101
Lo. Alamitol, CA 90720
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SITE ASSESSMENT
WORK PLAN
At
Former Texaco Service Station
2601 White Lane
Bakersfield, California
June 25, 2002
for
Shell Oil Products US
Mr. Edward Paden
Shell Oil Products US
P.O. Box 7869
Burbank, CA. 91510-7869
Prepared by:
~v (Gr]~
Southwest, Inc.
11021 Wmners Circle, Suite 101
Los Alamitos, CA 90720
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Southwestt lCnc
TABLE OF CONTENTS
1.0 IN"TR 0 D U CTI 0 N ........................................._....................................................................................... 1
2.0 SITE SETTIN" G ....................................................................................._................................................. 1
3.0 SITE IDS TORY ....................................................................................................................................... 1
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4.0 GEOLOGY AND HYDROGEOLOGY .............................................................................2
5. 0 PROPOSED FIELD A CTIVITIES................................................................................................... 3
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5.1 SOIL BORING INSTALLATION. .................. ................. ..................... ................. .................. .... ................3
5.2 SOIL SAMPLING AND ANALYSES .......................................................................................................... 4
6.0 HEALTH AND SAFETY PLAN .................................._........................................_.........................4
7.0 D~L SITE CLEARA.NCE .............................................................................................................. 4
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8.0 D ISPOSmO N OF D ~L CUTTIN' G8......................................................................................... S
9.0 ASSESSMENT REPORT .................................................................................................................... 5
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TABLE 1:
TABLE 1:
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FIGURE 1:
FIGURE 2:
FIGURE 3:
FIGURE 4:
FIGURE 5:
TABLES
UST Removal Sample Analytical Summary
Delineation Soil Sample Analytical Summary
FIGURES
Site Vicinity Map
Site Plan
UST Removal Soil Sample Locations
Remedial Excavation Soil Sample Locations
Proposed Boring Locations
419.EQL.00
June 25,2002
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SITE ASSESSMENT WORK PLAN
FORMER TEXACO SERVICE STATION
2601 White Lane
Bakersfield, California
1.0 INTRODUCTION
On March 4, 2002, four 10,000 gallon underground storage tanks (UST's), four dispensers and
associated piping were removed. Analysis of the soil samples taken during these activities showed that
the soil in the vicinity of the fonner tank pit and dispenser areas was impacted with hydrocarbons. A
remedial excavation was peJÍonned to remove impacted material. Subsequent sampling and analysis
conducted during overexcavation activities indicated reduced concentrations, however the presence of
some hydrocarbon impacted material stilI remains at the site.
Upon review of the Tank Removal and Remedial Excavation Report, dated April 8, 2002, the
Bakersfield City Fire Department outlined the need for additional assessment in a letter dated May 29,
2002. The following workplan outlines the proposed assessment activities to detennine the extent of
the contamination plume associated with the # 1 Dispenser and #3 UST areas.
This plan has been prepared to comply with Chapter 6.7 of the California Health and Safety Code
and Chapter 16, Title 23 of the California Code of Regulations. All work will be perfonned under
the supervision of a California-registered geologist.
2.0 SITE SETTING
The site is a fonner Texaco service station located on the southwest comer of White Lane and EI
Potrero Lane in the City of Bakersfield, California. The site is located in a commercial area of
Bakersfield, California (Figure 1). The fonner station consisted offour 10,000 gallon underground
storage tanks (UST's) and four dispenser islands (Figure 2).
3.0 SITE mSTORY
In December 1999, Artemis conducted a Phase I ESA at the subject site to detennine whether any
CUlTent or past uses of hazardous materials could result in impacts site soils and/or groundwater.
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According to the ESA report, a site assessment investigation was conducted at the site in 1985. IT
Corporation drilled one soil boring and installed four monitoring wells on the site. Analytical results of
soil samples indicated no detectable concentrations of petroleum hydrocarbons were present. Based on
a review of the project results, the County of Kern sent a letter to Texaco in December 1985 stating
that no significant soil impact had resulted ftom fuel tank leakage and that the case was considered
closed (Artemis, 1999).
As part of the ESA, Artemis searched several databases containing infonnation regarding leaking
tanks, Superfund sites, hazardous waste generation and handling, etc. Neither the subject site nor the
surrounding properties were included in the databases with the exception of five sites with state-
registered UST's and two sites identified as small quantity generators. No active Leaking
Underground Storage Tank (LUST) cases were identified.
Activities related to a site divestment by Shell Oil Products US included the removal of the tanks,
product lines and dispensers on March 4, 2002. Soil sampling was performed by WGR
Southwest, Inc. beneath the inverts of each tank and beneath each dispenser island. Analysis of
soil samples indicated the presence of hydrocarbon-impacted soil at various depths. A TPH-d
concentration of 170 mg/kg and a TPH-g concentration of9.1 mg/kg were detected in sample D-
1 at 6 feet below surface grade (BSG). MTBE concentrations of 26 µg/kg and 13 µg/kg were
detected in sample 3A at 15 feet and 19 feet, respectively. MTBE concentrations of68 µg/kg and
130 µg/kg were detected in sample 3B at 15 feet and 19 feet, respectively. A remedial excavation
of the #3 UST area was performed and delineation sampling was conducted on March 11, 2002.
Soil samples were collected at 23 feet BSG. An MTBE concentration of23 µg/kg was detected in
sample 3BB collected at the bottom of the excavation. Analytical results of the tank removal
compliance and delineation samples are summarized in Table 1 and Table 2. Soil sample
locations are shown on Figures 3 and 4.
4.0 GEOLOGY AND HYDROGEOLOGY
The geologic conditions in the site vicinity are characterized by alluvial deposits underlain by marine
and non-marine sedimenwy units, metamorphic rocks, and crystalline basement material.
419.EQL.00
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Surface and near-swface soil is designated by the U.S. Geological Survey (USGS) as older alluvium,
deposited in northwest-dipping alluvial fans resulting trom outwash trom 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
swface of these old alluvial fans is undulatory, with a distinct dip toward the Kern River to the
northwest of the site. The site itselfis located along one of the crests of the alluvial fan swface 'ripples',
at an elevation of approximately 393 feet above mean sea level (MSL). The total thickness of the
alluvial fan deposits is estimated to range trom approximately 600 feet west of the site to over 4,000
feet near the Sierra Nevada Mountains.
The site lies within the Edison hydrogeologic sub-area of the Edison-Maricopa area. Uppennost
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
ftacture zones of the crystalline basement rock. According to the County of Kern Health Department,
the depth to groundwater near the subject site is approximately 250 feet BSG with a local flow
direction toward the northwest. The most prominent subswface features controlling the groundwater
flow direction are the groundwater barriers fonned by the northwest-to-southeast trending Edison fault
and subparallel splays of this fault, located south and north of the site, respectively.
5.0 PROPOSED FIELD ACTIVITIES
5.1 SOIL BORING INSTALLATION
WGR Southwest, Inc. proposes to advance six soil borings on the subject property adjacent to areas of
hydrocarbon impaction (borings B-S through B-IO). Proposed boring locations are shown in Figure
5. Borings B-5 through B-7, adjacent to the dispenser island, will be drilled vertically to depths of
approximately 20 feet BSG. Borings B-8 through B-IO, located within or adjacent to the former UST
area, will be drilled vertically to depths of approximately 40 feet BSG.
The soil borings will be advanced vertically utilizing a limited access drilling rig equipped with 6-inch
outer diameter (O.D.) hollow-stem augers. Pre-cleaned augers will be used throughout the drilling
operation to prevent potential cross contamination. The soil borings will be backfilled using hydrated
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bentonite from the total depth of each boring to approximately 1 foot BGS and the upper portion of
each boring will be capped with concrete or asphalt to match the existing surface. The work will be
peñormed under the supervision of a California Registered Geologist.
5.2 SOIL SAMPLING AND ANALYSES
Undisturbed soil samples will be collected at 5-foot depth intervals for analyses in accordance with
EPA SW-846 procedures using an I8-inch long split-spoon sampler lined with 2-inch O. D. by 6-inch
long metal sample tubes. Following collection, each end of the brass tube will be sealed with Teflon
and a plastic end cap. The samples will be labeled with all pertinent sampling information, and then
preserved in a cooler for subsequent shipment to a California Department of Health Services ELAP-
certified lOOoratOl)' for analyses. The soil in the remaining tubes 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). Sampling equipment will be
decontaminated between sampling episodes utilizing a triple rinse method.
Each of the samples will be analyzed for total petroleum hydrocarbons as gasoline and diesel (TPH-g
and TPH-d) by EPA method 8015M and for benzene, toluene, ethyIbenzene, total xylenes (BTEX),
MTBE, and other fuel oxygenates by EP A Method 8260B.
6.0 REALm 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 a "tailgate" safety meeting will be conducted prior to initiation offield activities. The
plan will be maintained on-site throughout the duration of field activities. The plan will be
modified if warranted due to on-site conditions.
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
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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 DISPOSmON OF DRn.L CUTTINGS
Tbe drill cuttings generated during the drilling operation and the 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 work will be submitted. The report will
include a detailed description of the field activities, a summary of the analytical data, analytical reports
with QNQC documentation, soil boring logs, investigation findings and conclusions.
Respectfully submitted,
WGR Southwest, IDe.
Ryan ~
Staff Scientist
Enc.
/DAW
419.EQL.00
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June 25, 2002
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REFERENCES
WGR Southwest, Inc., Tank Removal and Remedial Excavation Report, Former Texaco Station,
2601 White Lane, Bakersfield, California, April 8, 2002.
419.EQL.00
June 25,2002
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I TABLES
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I 419 .EQL. 00 June 25, 2002
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Table 1
UST REMOVAL SOIL SAMPLE ANALYTICAL SUMMARY
Texaco Service Station
2601 White Lane
Bakersfield~ California
8015M EPA METHOD 8260B
Ethyl Total
Sample Depth TPH-d TPH-g Benzene Toluene Benzene Xylenes MTBE
Number (Ft) Date (mg/kg) (mglkg) (µg/kg) (µglkg) (µglkg) (µglkg) (µgIkg)
lA 15 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO 8.1
19 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
IB 15 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
19 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
2A 15 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 6.5
19 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
2B 15 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
19 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
3A 15 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 26
19 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 13
3B 15 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 68
19 3/4/02 NA ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO 130
4A 15 3/4/02 ND<5.0 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 7.3
19 3/4/02 ND<5.0 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO ND<5.0
4B 15 3/4/02 ND<5.0 ND<O.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
19 3/4/02 ND<5.0 ND<O.50 ND<5.0 ND<5.0 ND<5.0 ND<lO 5.5
D-l 2 3/4/02 ND<5.0 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO ND<5.0
6 3/4/02 170 9.1 ND<lO ND<lO 24 460 ND<10
D-2 2 3/4/02 ND<5.0 ND<O.50 ND<5.0 ND<5.0 ND<5.0 ND<lO ND<5.0
6 3/4/02 ND<5.0 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO 6.9
D-3 2 3/4/02 ND<5.0 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO ND<5.0
6 3/4/02 ND<5.0 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO ND<5.0
D-4 2 3/4/02 ND<5.0 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
6 3/4/02 76 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<lO ND<5.0
NA - Not Analyzed
ND - Not Detected
- - - - - - - - - - - - - - - - - - -·1
Table 2
DELINIATION SOIL SAMPLE ANALYTICAL SUMMARY
Texaco Service Station
2601 White Lane
Bakersfield, California
8015M EPA METHOD 8260B
Ethyl Total
Sample Depth TPH-g Benzene Toluene Benzene Xylenes MTBE
Number (Ft) Date (mglkg) (µg!kg) (µglkg) (µglkg) (µg/kg) (µglkg)
3AA 23 3/11/02 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 ND<5.0
3BB 23 3/11/02 ND<0.50 ND<5.0 ND<5.0 ND<5.0 ND<10 23
NA - Not Analyzed
ND - Not Detected
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I FIGURES
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I 419.EQL.00 June 25,2002
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TOPOl map printed on 04108/02 from "CalifomI8,tpo" and "Untltled.tpg"
119°03,000' W 119°02.000' W WGS84 119°01.000' W
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Source: TOPO 2000
CD-ROM
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Southwest, Ine.
11021 Winners Circle. Suite 101
Los Alarottos. CA 90720
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DATE PROJECT NUMBER
6/3/02 419.EQL.OO
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OVEREXCA V A nON (3/11/02)
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DATE PROJECT NUMBER
6/3/02 -'19.EQL.OO
Southweltt Inc.
11081 1IiIIIIeno CIrcle. SuIte 101
Lae AIamitaII. C4 80720
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