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IT Corporation
Submitted by:
-?',L~~
IT Corporation
4005 Port Chicago Highway
Concord, CA 94520-1120
Tel. 925.288.9898
Fax. 925.288.0888
A Member of The IT Group
REPORT ON
ADDITIONAL SITE ASSESSMENT
7-ELEVEN STORE #17721
3601 Stockdale Hwy.
BAKERSFIELD, CALIFORNIA
IT Corporation Project 823983
April 29, 2002
Prepared for:
Mr. Bob DeNinno
7 -Eleven Inc.
10220 S.W. Greenburg Road, Suite 470
Portland. OR 97233
IT Corporation
Approved by:
c/l~¿c::?'
SHELBY LATHROP
Project Manager
...-'
KIM METEZ
Staff Geologist
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Report on Additional Site Assessment
7-Eleven Store No, 17721, 3601 Stockdale Hwy" Bakersfield, CA
ii
April 29, 2002
CONTENTS
1.0 INTRODUCTION......... ............. ........... ........... ............. ......................... ...................... ......................1
2.0 ADDITIONAL ASSESSMENT ..........................................................................................................1
2.1 Site-Specific Health and Safety Plan.................. ....................... ............................... ...........1
2.2 Soil Boring..............................................,......................................................................... ...1
2.3 Soil Sample Collection......... ... ......... ......... ... ......... ......... ...........'............ ......... ...2
3.0 RESULTS .............. ........ ........................ ....... ............. ............... ....................... ....................... ..........2
3.1 Results of Soil Sample Analyses.........................................................................................2
4.0 CLOSURE ABSTRACT ........... ......... ........... ........... ............. ........................... ................... ........... ....2
FIGURES
1. Site Map
TABLES
1. Soil Analytical Results
APPENDICES
A. Drilling Logs
B. Laboratory Reports and Chain-of-Custody
17721sar,doc
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Report on Additional Site Assessment
7-Eleven Store No. 17721,3601 Stockdale Hwy., Bakersfield, CA
1
April 29, 2002
1.0 INTRODUCTION
This report is submitted by IT Corporation to summarize the results of the site assessment conducted at
the 7-Eleven Inc., Store No. 17721 at 3601 Stockdale Hwy. in Bakersfield, California (Figure 1). The
scope of work included the drilling and sampling of one angled soil boring to a depth of 40 feet below
surface grade (bgs) and preparation of this assessment report summarizing the methods and results of
the work performed.
The site assessment was completed as outlined in IT Corporation's June 6,2001 workplan prepared as
requested and approved by the Bakersfield Fire Department (BFD) in their letter dated November
27,2001. The work scope described in this report was completed at the site on March 26, 2002. The
purpose of the work was to establish vertical soil concentration distribution (as applicable) and determine
if shallow groundwater was to be found in proximity to the base of the soil hydrocarbon/oxygenate plume.
Additional assessment was requested on the basis of total petroleum gasoline (TPH-G) and methyl
tertiary butyl ether (MTBE) concentrations detected in soils during piping upgrades (IT Corporation,
2001). Soil concentrations ranged up to 4,300 milligrams per kilogram (mg/kg) TPH-G and 6.5 mg/kg
MTBE at depths of 2 feet below grade. At depths of 6 feet below grade, concentrations had declined to
100 mg/kg TPH-G and 0.85 mg/kg MTBE in soils beneath the piping areas.
2.0 ADDITIONAL ASSESSMENT
2.1 Site-Specific Health and Safety Plan
The existing site-specific Health and Safety Plan (as required by the Occupational Safety and Health
Administration Standard Hazardous Waste Operations and Emergency Response guidelines 29 Code of
Federal Regulations 1910.120) was used during recent activities. The document was reviewed and
signed by all IT Corporation personnel and subcontractors prior to commencement of work at the site.
2.2 Soil Boring
On March 26, 2002, IT supervised the drilling of one soil boring to 55 feet below grade with a
truck-mounted direct-push drill rig. The soil boring was drilled 15 feet deeper than proposed in the
June 6, 2001 workplan in attempt to reach groundwater. The soil boring was drilled at a 15 degree angle
to surface in order to obtain representative samples from under the dispenser island.
17721 sar.doc
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Report on Additional Site Assessment
7-Eleven Store No, 17721,3601 Stockdale Hwy., Bakersfield, CA
2
April 29, 2002
Groundwater was not encountered during drilling.
2.3 Soil Sample Collection
Soil samples were collected at five foot intervals from surface grade to total depth of drilling and logged
using the Unified Soil Classification System. The samples were then sealed using Teflon septum caps,
labeled with the job identification number, the sample number, date, time, and type of laboratory analysis
required. The samples were stored on ice and transported with a chain-of-custody record to a
state-certified laboratory for analysis. The samples were analyzed for TPH-G using EPA method 8015,
and for benzene, toluene, ethylbenzene, and xylenes (BTEX), MTBE, tert-butyl alcohol (TBA), di-
isopropyl ether (DIPE), ethyl-tertiary butyl ether (ETBE), tert-amyl methyl ether (TAME), ethylene
dibromide (EDB) and 1 ,2-dichloroethane (1 ,2-DCA) using EPA method 8260B. Copies of the drilling logs
can be found in Appendix A.
3.0 RESULTS
3.1 . Results of Soil Sample Analyses
Table 1 summarizes the laboratory analytical results for soil samples collected on March 26, 2002. Of the
soil samples collected, samples from 15 feet, 25 feet, 40 feet, 50 feet, and 55 feet below ground surface
were submitted to a laboratory for analysis.' None of the target analytes were detected in any of the soil
samples. Copies of the analytical results and chain-of-custody documents are included in Appendix B.
4.0 CLOSURE ABSTRACT
Site closure is requested on the basis of 1) completion of vertical delineation (the plume has been
demonstrated to be limited to depths of less than 10 feet below grade), and 2) no evidence of shallow
groundwater to a depth of 55 feet below grade.
17721 sar.doc
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FIGURES
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FACILITY
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60 FEET
7-ELEVEN, INC.
FACILITY NO. 17721
3601 STOCKDALE HIGHWAY
BAKERSFIELD, CALIFORNIA
FIGURE 1
SITE MAP
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TABLES
17721 sar.doc
-------------------
Table 1
Soil Sampling Results
March 26, 2002
7-Eleven Store #17721
3601 Stockdale Highway
Bakersfield, California
P
Soil Boring Samples
$at1:,,~·~·:$~~;5:mm;: ¡·i0&QJ~Z26/Q4;;{j';··
SB-1 24.5-25' 03/26/02
SBI1·..3~j5__4º.:.i.m; ¡;!:::Q3/26lOg,j:::.;:
SB-1 49.5-50' 03/26/02
SB~1.~4:5-55;.t:::. "'O~/26lQ2
<0.02
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Explanation
TPH-G = Total petroleum hydrocarbons-as-gasoline
MTBE = methyl-tert-butyl ether
TBA = tert-butanol
DIPE = diisopropyl ether
ETBE = ethyl-tert-butyl ether
TAME = tert-amylmethyl ether
mg/kg = milligrams per kilogram
7-11\17721_tbl.xls
1 of 1
04-02-02
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APPENDIX A
DRILLING LOGS
17721 sar .doc
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[I]
IT CORPORATION
A Member of the IT Group
Project ï-Eleven, SS#1772/
Location 3601 Stockdale Hwy, Bakerfield
Surface Elev.
Top of Casing
Screen: Dia
Casing: Dia
Fill Material Neat Cement
Drill Co. Vlronex
Driller Steve/Casey
Checked By Fd Simonis
Proj. No. 823983
Diameter 2 In.
Static
Type/Size
Type
Rig/Core Truck Mounted 6600/Macrocore
Method Geoprobe
Kim Metez Date 03/26/02 Permit #
License No: California RG#4422
Total Hole Depth
Water Level Initial
Length
Length
Log By
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Drilling Log
Soil Boring
58-1
Owner 7-Eleven, Inc.
See Site Map
For Boring Location
55 ft.
COMMENTS:
No groundwater. PlO readings 0.0.0..
Refusal @55 feel. Li!¡~t ~'33.. ' nM..a11
the Joc) U'UWII ¿v SC ,*cct.
Description
(Color, Texture, Structure)
Trace < 10%, Little 10% to 20%. Some 20% to 35%, And 35% to 50%
Asphalt (?) ovel' gravel base.
Very fine to medium SAND: brown, slightly moist, soft/loose, micaceous.
SW
Fine to medium SAND: light brown, dry, loose, angular to subangular,
micaceous, no product odor,
Grades clayey, silty fine to medium SAND (10,15,75): soft,
Grades very fine to fine SAND: loose.
Sandy, clayey SIL T (15,35,50): brown, slighty moist, soft, slightly plastic.
tv1edium SAND: tan, dry, loose, subangular, feldspathic, slightly micaceous.
sw
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(caving?),
tv1edium SAND: tan, dry, loose, angular to subangular, feldspathic, slightly
micaceous.
Grades interbedded medium SAND and medium to coarse SAI\JD,
Grades interbedded with fine to medium S,L\,I\ID,
.
SW
Grades medium to coarse SAI\ID,
Page: 1 of 2
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1111 IT CORPORATION
A Mem/)er of the IT Group
Project ï-Eleven. SS#lï121
Location 3601 Stockdale Hwv, Bakerfield
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Soil Boring 58-1
Owner 1-Eleven. Inc.
Pro;, No, 823983
Description
(Color, Texture, Structure)
Trace < 10%, Little 10% to 20%, Some 20% to 35%. And 35% to 50%
Ivtedium to coarse SAND: tan, dl'y, loose, angular to subangular, feldspathic,
slightly micaceous.
Grades medium SAND.
Grades medium to coal'se,
Grades fine and fine to medium S,AND: tan with orange yellow layers (a few
2-3mm black laminae of fine grained heavy minerals -80%) subrounded,
Sandy GRAVEL: dry.
Grades pebbly coal'se SAND.
Grades interbedded medium to coarse SAI\ID and fine to medium SAND,
,
F'age: 2 of 2
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APPENDIX B
LABORATORY REPORTS AND CHAIN-OF-CUSTODY
17721 sar.doc
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I IT Corp
I 4005 Port Chicago Hwy
Concord CA, 94520
I Sample ID
SB-1 14.5-15'
I SB-1 24.5-25'
SB-1 39.5-40'
I 8B-1 49.5-50'
SB-1 54.5-55'
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SunStar Laboratories, Inc.
I ~
I Leah Beauchaine, Project Manager
Project: 7- Eleven # 1 7721
Project Number: 823983
Project Manager: Shelby Lathrop
Reported:
4/1/02
ANALYTICAL REPORT FOR SAMPLES
Laboratory ID Matrix
T200221-01 Soil
T200221-02 Soil
T20022 1-03 Soil
T200221-04 Soil
T200221-05 Soil
Date Sampled
Date Received
3/26/02
3/26/02
3/26/02
3/26/02
3/26/02
3/27/02
3/27/02
3/27 /02
3/27/02
3/27/02
The results in this report apply to the samples analyzed in accordance with the chain of
custody document, This analytical report must be reproduced in its entirety,
Page 1 of8
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IT Corp
4005 Port Chicago Hwy
Concord CA, 94520
Project: 7-Eleven #17721
Project Number: 823983
Project Manager: Shelby Lathrop
Reported:
4/1/02
Volatile Organic Compounds by EP A Method 8260B
SunStar Laboratories, Inc.
Reporting
Analyte Result Lirnit Units Dilution Batch Prepared Analyzed Method Notes
SB-l 14.5-15' (T200221-01) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11:00
Benzene ND 5.0 ug/kg 2040103 03/29/02 03/30/02 EPA 82608
Di-isopropyl ether ND 20
Ethylbenzene ND 5,0
Ethyl tert-butyl ether ND 20
Methyl tert-butyl ether ND 20
Tert-amyl methyl ether ND 20
Tert-butyl alcohol ND 50
Toluene ND 5.0
m,p-Xylene ND 5.0
o-Xylene ND 5.0
Surrogate: Toluene-d8 96.9% 81-117
Surrogate: 4-Bromofluorobenzene 91,1 % 74-121
Surrogate: Dibromofluoromethane 115% 80-120
SB-l 24.5-25' (T200221-02) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11 :00
Benzene ND 5.0 ug/kg 2040103 03/29/02 04/0 1/02 EPA 82608
Di-isopropyl ether ND 20
Ethylbenzene ND 5.0
Ethyl tert-butyl ether ND 20
Methyl tert-butyl ether ND 20
Tert-amyl methyl ether ND 20
Tert-butyl alcohol ND 50
Toluene ND 5.0
m,p-Xylene ND 5.0
o-Xylene ND 5.0
Surrogate: Toluene-d8 97.2 % 81 -117
Surrogate: 4-Bromofluorobenzene 93,3 % 74-121
Surrogate: Dibromofluoromethane 97,8 % 80- 1 20
SunStar Laboratories, Inc.
The results in this report apply to the samples analyzed in accordance with the chain of
custody document. This analytical report must be reproduced in its entirety,
~
Leah Beauchaine, Project Manager
Page 2 of 8
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IT Corp
4005 Port Chicago Hwy
Concord CA, 94520
Project: 7-Eleven #17721
Project Number: 823983
Project Manager: Shelby Lathrop
4/1/02
Reported:
Volatile Organic Compounds by EP A Method 8260B
SunS tar Laboratories, Inc.
Reporting
Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes
S8-1 39.5-40' (T200221-03) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11:00
Benzene NO 5.0 ug/kg 2040103 03/29/02 03/30/02 EPA 82608
Oi~isopropyl· ether NO 20
Ethylbenzene NO 5.0
Ethyl tert-butyl ether NO 20
Methyl tert-butyl ether NO 20
Tert-amyl methyl ether NO 20
Tert-butyl alcohol NO 50
Toluene NO 5.0
m,p-Xylene NO 5.0
o-Xylene NO 5.0
Surrogate: Toluene-d8 98,7% 81-117
Surrogate: 4-Bromofluorobenzene 93,2 % 74,121
Surrogate: Dibromofluoromethane 117% 80-120
S8-1 49.5-50' (T200221-04) Soil Sampled: 03/26/0200:00 Received: 03/27/02 11:00
Benzene NO 5.0 uglkg 2040103 03/29/02 04/01/02 EP A 82608
Oi-isopropyl ether NO 20
Ethylbenzene NO 5.0
Ethyl tert-butyl ether NO 20
Methyl tert-butyl ether NO 20
Tert-amyl methyl ether NO 20
Tert-butyl alcohol NO 50
Toluene NO 5.0
m;p-Xylene NO 5.0
o-Xylene NO 5.0
Surrogate: Toluene-d8 98.0% 81-117
Surrogate: 4-Bromofluorobenzene 103 % 74-121
Surrogate: Dibromofluoromethane Jl6% 80-120
SunStar Laboratories, Inc.
The results in this report apply to the samples analyzed in accordance with the chain of
custody document. This analytical report must be reproduced in its entirety.
."
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Page 3 of8
Leah Beauchaine, Project Manager
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IT Corp
4005 Port Chicago Hwy
Concord CA, 94520
Project: 7-Eleven #17721
Project Number: 823983
Project Manager: Shelby Lathrop
Reported:
4/1/02
V olatile Organic Compounds by EP A Method 8260B
SunStarLaboratories, Inc.
Analyte
Analyzed
Method
Reporting
Result Limit Units Dilution Batch
Notes
Prepared
SB-l 54.5-55' (T200221-0S) Soil
Benzene
Oi-isopropyl ether
Ethylbenzene
Ethyl tert-butyl ether
Methyl tert-butyl ether
Tert-amyl methyl ether'
Tert-butyl alcohol
Toluene
m,p-Xylene
o-Xylene
Surrogate: Toluene-d8
Surrogate: 4-Bromofluorobenzene
Surrogate: Dibromofluoromethane
Received: 03/27/02 11:00
Sampled: 03/26/02 00:00
NO 5,0
NO 20
NO 5.0
NO 20
NO 20
NO 20
NO 50
NO 5.0
NO 5.0
NO 5.0
98.9%
93.1 %
111 %
03/29/02
04/01102
EPA 82608
ug/kg
2040103
81-117
74-121
80-120
SunStar Laboratories, Inc.
I fY) ÍI
~
,I "-:.,
The results in this report apply to the samples analyzed in accordance with the chain of
custody document, This analytical report must be reproduced in its entirety.
Leah Beauchaine, Project Manager
Page 4 of 8
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IT Corp Project: 7-Eleven #17721
4005 Port Chicago Hwy Project Number: 823983 Reported:
Concord CA, 94520 Project Manager: Shelby Lathrop 4/1/02
Purgeable Petroleum Hydrocarbons by 8015
SunStar Laboratories, Inc.
Reporting
Analyte Result Lirnit Units Dilution Batch Prepared Analyzed Method Notes
SB-l 14.5-15' (T200221-01) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11:00
Gasoline Range Hydrocarbons ND 500 uglkg 2032902 03/28/02 03/28/02 EPA 80158
Surrogate: 4-Bromojluorobenzene 90.4 % 65-135
~B-l 24.5-25' (T200221-02) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11 :00
Gasoline Range Hydrocarbons ND 500 ug/kg 2032902 03/28/02 03/28/02 EPA 80158
Surrogate: 4-Bromojluorobenzene 86.4 % 65-135
SB-l 39.5-40' (T200221-03) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11:00
Gasoline Range Hydrocarbons ND 500 uglkg 2032902 03/28/02 03/28/02 EPA 80158
Surrogate: 4-Bromojluorobenzene 89.6% 65-135
SB-l 49.5-50' (T200221-04) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11:00
Gasoline Range Hydrocarbons ND 500 ug/kg 2032902 03/28/02 03/29/02 EPA 80158
Surrogate: 4-Bromojluorobenzene 81,6% 65-.135
SB-l 54.5-55' (T200221-05) Soil Sampled: 03/26/02 00:00 Received: 03/27/02 11:00
Gasoline Range Hydrocarbons ND 500 ug/kg 1 2032902 03/28/02 03/28/02 EPA 80158
Surrogate: 4-Bromojluorobenzene 88.8% 65,135
SunS"" ~ --,
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The results in this report apply to the samples analyzed in accordance with the chain of
custody document, This analytical report must be reproduced in its entirety,
Page 5 of8
Leah Beauchaine, Project Manager
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IT Corp
4005 Port Chicago Hwy
Concord CA, 94520
Project: 7-Eleven #17721
Project Number: 823983
Project Manager: Shelby Lathrop
Reported:
4/1/02
V olatile Organic Compounds by EP A Method 8260B - Quality Control
SunStar Laboratories, Inc.
Reporting Spike Source %REC RPO
Analyte Result Limit Units Level Result %REC Limits RPO Limit Notes
Batch 2040103 - EPA 5030 Soil MS
Blank (2040103-BLK1) Prepared & Analyzed: 03/29/02
Benzene NO 5,0 ug/kg
Oi-isopropyl ether NO 20
Ethylbenzene NO 5.0
Ethyl tert-butyl ether NO 20
Methyl tert-butyl ether NO 20
Tert-amyl methyl ether NO 20
Tert-butyl alcohol NO 50
Toluene NO 5.0
m,p-Xylene NO 5.0
o-Xylene NO 5.0
Surrogate: Toluene-d8 98,0 100 98,0 81-Il7
Surrogate: 4-Bromofluorobenzene 89,9 100 89,9 74-121
Surrogate: Dibromofluoromethane 105 100 105 80-120
LCS (2040103-BS1) Prepared & Analyzed: 03/29/02
Benzene 247 5,0 uglkg 250 98.8 75-125
Toluene 245 5.0 250 98,0 75·125
Surrogate: Toluene-d8 98.7 100 98.7 81·Il7
Surrogate: 4-Bromofluorobenzene 94.6 100 94.6 74,121
Surrogate: Dibromofluoromethane 105 JOO 105 80-120
LCS Dup (2040103-BSD1) Prepared & Analyzed: 03/29/02
Benzene 214 5,0 uglkg 250 85,6 75-125 14.3 20
Toluene 207 5,0 250 82,8 75·125 16.8 20
Surrogate: Toluene-d8 97,5 100 97.5 81-Il7
Surrogate: 4-Bromofluorobenzene 92,3 JOO 92.3 74-121
Surrogate: Dibromofluoromethane Il7 100 Il7 80-120
SunStar Laboratories, Inc.
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The results in this report apply to the samples analyzed in accordance with the chain of
custody document. This analytical report must be reproduced in its entirety.
Leah Beauchaine, Project Manager
Page 6 of 8
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IT Corp
4005 Port Chicago Hwy
Concord CA, 94520
Project: 7-Eleven #17721
Project Number: 823983
Project Manager: Shelby Lathrop
Reported:
4/1/02
Purgeable Petroleum Hydrocarbons by 8015 - Quality Control
SunStar Laboratories, Inc.
Analyte
Reporting
Limit Units
RPO
Spike
Level
Source
Result
%REC
%REC Limits
Result
Batch 2032902 - EP A 3550B
Blank (2032902-BLK1)
Gasoline Range Hydrocarbons
Prepared: 03/28/02 Analyzed: 03/29/02
NO 500 ug/kg
120 125 96.0 65,135
Prepared & Analyzed: 03/28/02
10700 500 ug!kg 12500 85.6 75-125
117 125 93.6 65-135
Prepared & Analyzed: 03/28/02
12100 500 ug/kg 12500 96.8 75-125 12,3 20
126 125 101 65-135
Surrogate: 4-Bromofluorobenzene
LC8 (2032902-B81)
Gasoline Range Hydrocarbons
Surrogate: 4-Bromofluorobenzene
LC8 Dup (2032902-B8D1)
Gasoline Range Hydrocarbons
Surrogate: 4-Bromofluorobenzene
RPO
Limit
Notes
SunStar Laboratories, Inc.
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The results in this report apply to the samples analyzed in accordance with the chain of
custody document. This analytical report must be reproduced in its entirety,
Leah Beauchaine, Project Manager
Page 7 of 8
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IT Corp
4005 Port Chicago Hwy
Concord CA, 94520
Project: 7-Eleven#17721
Project Number: 823983
Project Manager: Shelby Lathrop
Reported:
4/1/02
DET
Analyte DETECTED
ND Analyte NOT DETECTED at or above the reporting limit
NR
Not Reported
dry Sample results reported on a dry weight basis
RPD
Relative Percent Difference
Notes and Definitions
SunS tar Laboratories, Inc.
The results in this report apply to the samples analyzed in accordance with the chain of
custody document. This analytical report must be reproduced in its entirety,
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Leah Beauchaine, Project Manager
Page 8 of 8
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Vironex Inc.
3002 Dow Ave, 8te,. 406
Tustin, CA 92780
1-800-847-6639
Chain of Custody Record
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