HomeMy WebLinkAbout1701 STINE RD (5) E 2C Remediation
Environmental Engineering;
Consulting and Remediation,Inc:
October 20;2008
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Mr. Frank Hobin
8908 Versailles Dr..
Bakersfield, CA 93311
SUBJECT: "Workplan for Soil Gas Investigation
Former Niagara Car Wash
1700 Stine Road
Bakersfield, California
Dear Mr."Hobin:
This report presents a:Workplan to perform a'Soil:.Gas Investigation at the former the, Former
Niagara•Car Wash located at 1700 Stine Road.(Site) in Bakersfield, California. .This Workplan
is .submitted.-in response to a request-from the State of :California :;Regional Water. Quality
Control:Board'–Central.Valley.Region (RRWQCB): .
It is'a.pleasure to be of'service "should,you have any..questions regarding,this submittal,.do not
hesitate to Call Phil Goalwin at 661-831-6906:
Respectfully Submitted,
E2C Remediation ,. �gVDNw. p,
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William A. Lawson, P.G..# 171 INo�;717�:
Director:of Technical Oper tions 1
cc,: Mr.John Whiting;R.G.
Regional Water Quality Control Board-Central Valley Region
1685.E Street
'Fresno;,CA 93706-2020
Mr..Howard H.Wines Ill-P.G.
Hazardous Materials Specialist
City of Bakersfield Fire Department,Office of Environmental Services .
900 Truxton Avenue, Suite 210
Bakersfield;CA 93301
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5300 Woodmere Drive,Suite 105,.Bakersfield,CA 93313
tel 661.831.6906 fax 661.831.6234.;www.e2cr.net
r E2C Remediation
Environmental Engineering,
Consulting and Remediation,Inc.
WORKPLAN FOR SOIL GAS INVESTIGATION
FORMER NIAGARA CAR WASH
t
1701 ,STEIN ROAD
BAKERSFIELD, CALIFORNIA
' "October.20,2008
: Project Number 1812BK45
Prepared For:
' Mr, Frank Hobin
8908 Versailles Dr:
' Bakersfield; CA 93311
' Prepared By:
E2C.Remediation
Environmental/Engineering Consultants
5300 Woodmere Drive, Suite 105
Bakersfieidj CA 93313
5300;Woodmere Drive,Suite 105,Bakersfield,CA 93313
tel 661.831.6906 fax 661.831.6234 www.e2cr.net
' P r 4 r
roiect Number 18128K 5 October 20.2008
TABLE OF CONTENTS
TABLE OF CONTENTS...............................................................................................................i
' LIST OF ATTACHMENTS ..................................... .............I....................... ........................... ii
1.0 INTRODUCTION........................................................I..................... ..............................1
1.1 Site Description ............................................................................................................1
1.2 Site Hydrogeology.... .................................:...............................................................1
1.3 Site History.................................. ...........................................................................:..1
' 2.0 WORKPLAN FOR SOIL GAS INVESTIGATION..............................................................3
2.1 Field Activities...............................................................................................................3
2.2 Soil Gas Investigation Report of Findings.....................................................................3
2.3 Soil Gas Vapor Monitoring Well Installation..................................................................4
2.3.1 . Additional Soil and Lithologic Investigations
' 2.3.2 Soil Vapor,Monitoring Well Spacing....................:..................................................4
2.3.3 SGA Well Depth....................................................................................................4
2.3.4 SGA Well Installation Procedure ................................................. ......................4
' 2.3.5 Equilibration Time................................................. ........ ............................... .5
2.4 Purge Volume................................................................................................... ........5
2.5 Leak Test..................................................................................................................... 5
2.5.1 Leak Test Frequency..;. .5
2.5.2 Leak Check Compounds .......................................................................................5
' 2.5.3 Leak Test Protocol.................................................................................................5
2.5.4 Leak Test Analytical .........................................
2.6 Purge/Sample Flow Rate..............................................................................................5
2.6.1 No-Flow/Low-Flow Rates.......................................................................................6
2.6.2 Purging/Sampling Rates........................................................................................6
' 2.7 Soil Gas Sampling Protocol..........................................................................................6
2.7.1 Sample Container Cleanliness and Decontamination ............................................6
2.7.2 Documentation of SGA Well Sampling Protocol:.............:.....................................7
' 2.7.3 Chain of Custody Records.....................................................................................7
2.8 Analysis of Soil Gas Samples.......................................................................................7
2.8.1 Quality Assurance/Quality Control (QA/QC) .......................:..................................7
2.8.2 . Laboratory Certification and Analysis.....................................................................7
2.8.3 Detection Limits for Target Compounds .............................:..................................8
' 2.8.4 Sample Handling ...................................................................................................8
2.8.5 Holding Time.........................................................................................................8
2.8.6 Analytical Methods:................................................................................................8
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2.8.7 Target Compounds................................................................................................8
2.9 Health Risk Investigation ........................................
3.0 LIMITATIONS AND REPORT CERTIFICATION ..............................................................9
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Project Number 1812BK45 October 20,2008
LIST.OF ATTACHMENTS
Figure 1 -Site Location
' Figure 2 -.Site Plan.with Soil Gas Sampling Locations
Figure 3—Typical Soil Gas.Well Construction Diagram
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Proiect Number 1812BK45 October 20.2008
10 INTRODUCTION
This Workpian details the Scope of Work proposed to install and sample three (3) soil,gas
' investigation monitoring wells to evaluate the potential for any remaining fuel hydrocarbon mass
to pose an inhalation health risk at the Former Niagara Car Wash located at 1700 Stine Road
(Site) in Bakersfield, California. This Workplan is submitted in response to a request from the
State of California Regional Water Quality Control Board—Central Valley Region (RWQCB).
1:1 Site Description
' The Site is currently utilized as an operating car wash (Whitewater Car Wash) located in
Bakersfield, California, at 1700 Stine Road between Stine Road and Hasti Acres Drive. The
Site encompasses,approximately 1.7 acres and is located approximately 200 feet south of Ming
' Avenue. The Site is located in Section 11, Township 30 South, Range 27 East MDBM.
Three (3) 12,000-gallon gasoline underground storage tanks (USTs) were located as shown on
Figure 1 (Site Plan). The USTs were installed in 1983 and were removed in April 2003. The
fuel dispensers under the canopy area were removed, as well as the associated piping. One
(1) 2,000-gallon waste oil UST is still located at the Site, as shown on Figure 1.
The surrounding area is a mixed commercial and residential area along Stine Road and Hasti
Acres Drive.
' 1.2 Site Hydrogeology
Regionally, the depth to groundwater had been estimated at approximately 190 feet bgs,
according to the 1996 Water Supply Report.published by the Kern County Water. Agency.
During March 2003 drilling activities, first encountered groundwater was found at a depth of
approximately 163 feet bgs. 'In July 2005, groundwater was encountered at approximately 170
' feet bgs. In 2008, the groundwater was encountered at a depth of approximately 164 feet bgs.
The surrounding area well survey identified four (4) production wells within a.2,500-foot-radius
' of the Site.. All of these wells were noted to be operating during.a field reconnaissance.
The Stine Canal (irrigation -and runoff) traverses the Site from northeast to southwest between
the carwash building and Stine Road. The canal continues beneath the Site as a concrete pipe
' culvert which extends from north of Ming Avenue to the southern boundary of the Site. South
of the Site the canal is unlined. Water generally flows in the.canal on a year-round basis.
' 1.3 Site History
A detailed Site History was discussed in the June 17, 2003 report, `Site Characterization.Report
' of Findings, Report of Surrounding Area Well Survey, SVE System Installation and Pilot Test
Report of Findings & Workplan to Implement Remedial Action, Former Niagara Car Wash, 1701
Stine Road, Bakersfield, California'(I RAP).
in March 2003, E2C installed one (1) groundwater monitoring well to assess groundwater
conditions at the Site. In addition, six (6) VE wells were installed and two (2) 40-foot soil
borings were advanced on either side of the dispenser islands. Upon completion of the well .
' installations, the remediation wells were plumbed to a manifold in the equipment pad area. This
work was reported in the Site Characterization Report of Findings,'dated June 17, 2003. In a
letter, dated August 26, 2003, the RWQCB requested additional groundwater characterization.
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Proiect Number 1812BK45 October 20.2008
1 Groundwater monitoring wells MW-2 and MW-3 were installed during the week of September
28, 2003, after which the wells were developed. Initial groundwater monitoring/sampling was
1 conducted at the new wells in October 2003 and that data was reported in the Fourth Quarter
2003 Groundwater Monitoring Report,.dated February 1, 2004.
In May 2005, vapor extraction (VE) well VE-FD was installed at the Site, as approved by the
RWQCB in a letter dated March 15, 2005. Installation of the well was reported in the following
document:
' • First Quarter 2005 Groundwater Monitoring Report, Second.Quarter 2005 Groundwater
Monitoring Report, Third Quarter 2005 Groundwater Monitoring Report, and
Remediation Status Report, Former Niagara Carwash, 1701 Stine Road, Bakersfield,
' California, dated September 5, 2005.
In June 2006, E2C conducted additional investigation testing on the newly installed VE-FD
vapor extraction point. The results of that testing verified that only a minor residual fuel
hydrocarbon mass remained at the Site. The data from this testing was reported in the
following document:
Second Quarter 2006 Groundwater Monitoring Report, Third Quarter 2006 Groundwater
' Monitoring Report, Additional Investigation Report of Findings and Remediation Status
Report, dated November 28, 2006.
' The RWQCB reviewed the November 28, 2006 report and provided the following comments:
■ "Resume full-time SVE operation or submit a work plan to conduct pilot testing to
1 evaluate remaining extractable gasoline mass in the known UST release by 15 March
2007. The work plan should be brief and describe proposed test procedures. The
proposed SVE test should utilize.SVE wells VE-A, VE-B and VE-C.";
I do not request additional investigation in the dispenser island area."; and
■ Submit a Workplan for potential human health risk investigation (HHRA) by April 16,
2007.
During the period of May 29-31, 2007, soil vapor extraction (SVE) testing was conducted at
existing vapor extraction wells (VE wells) in the area of the former underground storage tanks
' (USTs). Testing was conducted using varying configurations of VE wells for extraction while
monitoring influence at observation wells, both VE wells and monitoring wells. Testing was
conducted using the following scenarios:
■ For the shallow zone using existing vapor extraction (VE) wells VES-As and VES-Bs;
■ For the deep zone using VE wells VES-Ad and VES-13d;
■ For the combined, shallow and deep zones using VE wells VES-As, VES-Ad, VES-Bs
' and VES-13d;
■ For the intermediate zone using VE well VES-C; and
■ For the combined shallow, intermediate and deep zones using all VE wells (all VE wells
' open for extraction).
E2C calculated the SVE radii of influence (ROI) to be, generally, greater than 105 feet, and on
' occasion the ROI exceeded 130 feet. These ROI agree with the ROI calculated during the site
SVE Pilot Test in March 2003, and the additional investigation SVE test at VE-FD in June 2006.
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Project Number 1812BK45 October 20.2008
Initially, all VE wells were individually tested to determine which well, or combination of wells,
would yield the highest influent concentration(s). VES-C showed the highest concentrations
during this testing; however, concentrations dropped at this well until at the end of testing 28
hours later, the concentration at VES-C was only 35 ppmV, a fuel hydrocarbon removal rate of
only 2.1 pounds per day (lbs/day). This indicates that continued operation of an SVE system
' would extract soil vapors at less than 2.1 .Ibs/day over.any long-term period. Additionally,
testing of the shallow and deep zones,individually and collectively yielded very. low (25-50
ppmV) influent concentrations. As such, and combined with the long-term non-detect of fuel
hydrocarbon constituents in groundwater (more than two years), the minor mass of fuel
hydrocarbons remaining beneath the Site does not warrant continued remedial action.
The RWQCB review of the November 28, 2006 report included a request for a Workplan for
' potential human health .risk investigation (HHRA). The following Workplan presents the
methods and procedures that are proposed for conducting a soil gas investigation at the site.
2.0 WORKMAN FOR SOIL GAS INVESTIGATION
The following sections detail the methods and procedures E2C will follow to install soil gas
investigation monitoring wells (SGA wells) and to conduct a soil gas investigation at the Site.
The semi-permanent SGA wells are a cost-effective alternative for periodic soil gas sampling to
monitor remedial progress at the Site.
1 2.1 Field Activities
E2C will notify the RWQCB prior to implementation of field activities. All necessary permits and
utility clearance(s) will be obtained prior to conducting any investigations described in this .
Workplan. All work will be performed or supervised by a California Professional Geologist, in
accordance with the Business and Professions Code, Chapters 7 and 12.5, and the California
Code of Regulations, Title 16, Chapters 5 and 29. E2C will make raw data available to the
RWQCB staff, in the field and/or in the office. E2C will accommodate adjustments or
modifications to the sampling program, mandated by evaluation of the data set or unforeseen
' site conditions, if required by the RWQCB staff. IDWs will be handled and disposed in
accordance with federal, state and local requirements.
' To expedite the completion of field activities (and to avoid potential project delays)
contingencies have been proposed in this Workplan (e.g., soil matrix samples will also be
collected [as defined in the Unified Soil Classification System (USCS)] if clayey soils are
encountered during the proposed soil gas investigation. The RWQCB field staff will be
informed of any problems, unforeseen site conditions, or deviations from the approved
Workplan. When it becomes necessary to implement modifications to the approved Workplan,
' the RWQCB will be notified and a verbal approval will be obtained before implementing
changes.
2.2 Soil Gas Investigation Report of Findings
A soil gas investigation report of findings, including a discussion of field operations, deviations
from the approved Workplan, data inconsistencies, and other significant operational details will
be prepared. The report of findings will include a Site plan map and probe location map at a
scale of one inch = 30 feet, soil gas. iso-concentration maps for contaminants of concern at a
scale of 1 inch = 30 feet, summary tables for analytical data [in micrograms per liter (µg/L)], in
accordance with the Active Soil Gas Investigation (ASGI) guidance. E2C will also provide
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Proiect Number 1812BK45 October 20.2008
legible copies of field and laboratory notes or logs, all analytical results and Quality
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Assurance/Quality Control (QA/QC) . information, including tables and explanations of
procedures, results, corrective actions and effect on the data.
2.3 Soil Gas Vapor Monitoring Well Installation
2.3.1 Additional Soil and Litho/ogic Investigations
Site soil and lithologic information will be obtained by collecting undisturbed soil samples from
1 soil gas sampling point SGA-1 (located southeast of the former UST cluster, see Figure 2).
The soil samples will be collected with a slide-hammer in two (2) inch diameter brass liners from
depths of two (2) and four (4) feet bgs. The samples will be submitted for physical parameter
' testing, which includes gradation, effective permeability, porosity, soil moisture, and soil density.
The results of the parameter testing will provide accurate soil Input parameters to be used in an
indoor air intrusion risk model. The results of the.indoor air intrusion risk modeling will be
presented as part of the soil gas investigation report.of findings..
Low-flow or no-flow conditions (e.g., fine-grained soil; clay, soil with vacuum readings that
exceed approximately 10 inches of mercury or 136 inches of water) are not expected to be
encountered; however, if low-flow or no-flow conditions are encountered, soil matrix sampling
using EPA Method 5035A will be conducted in those specific areas.
2.3.2 Soil Vapor Monitoring Well Spacing
Refer to Figure 2 for a scaled site plan depicting proposed SGA well locations. The SGA well
spacing presented on Figure 2 has been selected'in accordance with the most current ASGI
1 and has been biased to optimize detecting and delineating VOCs. E2C will install three (3) SGA
wells (SGA-1 through SGA-3), which will be sampled after installation.
2.3.3 SGA Well Depth
All SGA wells will be installed to a depth of approximately five (5) feet below ground surface
(bgs)•
' 2.3.4 SGA Well Installation Procedure
E2C personnel will use a Bobcat with a four (4) inch outside diameter auger attachment to
advance a boring to the design depth of approximately 5.0 feet below ground surface'(bgs). If
an asphalt or concrete surface is present, E2C will utilize a coring machine to penetrate the
surface material.
' At the bottom of the boring, E2C will emplace a one and one-half (1.5) inch vapor sampling
screen in the center of a one-foot sand pack (#3 Lonestar sand or equivalent). 1/8 inch
diameter Teflon@ tubing will extend from the sampling screen to the surface. One (1) foot of
' dry granular bentonite will be emplaced on top of the sand pack to preclude the infiltration of
hydrated bentonite grout. The borehole will then be grouted to approximately six (6) inches
below the surface with hydrated bentonite. The surface completion will consist of a five (5) inch.
' diameter, traffic-rated monitoring well box, set in concrete (See Figure 3).
E2C field personnel will prepare detailed SGA well installation boring logs,-which will document
' the date and time of the installation activity, the depth of each SGA well, the screen type and
interval; material utilized, and surface completion details. SGA well logs will be included in the
SGA well installation report of findings.
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Proiect Number 1812BK45 October 20,2008
1 2.3.5 Equilibration Time.
Following the installation of the SGA well, subsurface conditions will be disturbed. To allow
subsurface conditions to equilibrate, the purge volume test, leak test, and soil gas sampling will
not be conducted for at least 48 hours following installation, in compliance with the DTSC
document, Advisory—Active Soil Gas Investigations.
2.4 Purge Volume
To ensure that stagnant or ambient air is removed from the sampling system and to assure
samples collected are representative of subsurface conditions, E2C will purge three (3) casing
volumes from each SGA well. Based on a boring diameter of four (4) inches, a filter pack
twelve (12) inches in.height, and a porosity of 30%, E2C estimates that one (1) casing volume
' will be approximately 200 milliliters. Therefore; three (3) casing volumes would equate to
approximately 600 milliliters. At a purge.rate of 200 ml/min, purging will be accomplished in
approximately three (3) minutes. E2C will use a purge pump, calibrated to pump 200 milliliters
' per minute. The purge pump will not be used for sampling purposes.
2.5 Leak Test
' Leakage during soil gas sampling may dilute samples with ambient air and may produce results
that underestimate actual site concentrations or may contaminate the sample with external
constituents. Leak tests will be conducted to determine whether leakage is present (e.g.,
' leakage is confirmed if the leak check compound is detected in the test sample).
2.5.1 Leak Test Frequency
Leak tests will be.conducted at every SGA well location.
2.5.2 Leak Check Compounds
' The tracer compound tetrafluoroethane will be used as leak check compounds, if a detection
limit (DL) of 10 µg/L or less can be achieved.
2.5.3 Leak Test Protocol
' The leak check compound (tetrafluoroethane) will be enclosed within a tent-type structure at
each potential leak point to keep the potential leak areas at saturated concentrations
1 throughout the test.
2.5.4 Leak Test Analytical
The chemical analysis of the soil gas sample will include an analysis for .the leak check
' compound. If the leak check compound is detected in the sample, the cause of the leak will be
determined and corrected, and confirmation sampling will be performed. If the leak check
compound is suspected or detected as a site-specific contaminant, a new leak check compound
' will be selected.
2.6 Purge/Sample Flow Rate
The sampling and purging,flow rate of 100 ml/min to 200 ml/min was selected to minimize
compound partitioning during soil gas sampling. Samples will not be collected if field
conditions, such as rainfall, irrigation, fine grained sediments, or drilling conditions affect the
ability to collect soil gas samples. If no-flow or low-flow conditions are caused by wet soils, the
soil gas sampling will cease. In,addition, the soil gas sampling will not be conducted during or
immediately after a significant rain�event (e.g., 1/2 inch or greater), or onsite watering.
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If low flow conditions are determined to be from a specific lithology, a new SGA well will be .
installed at a new lateral location selected after evaluation of the site lithologic logs and/or in
consultation with the RWQCB. If moisture or unknown material is observed, installation of the
SGA well will cease until the cause of the problem is identified and corrected. If refusal occurs
during drilling, an alternate SGA well location will be selected (after consultation with the
1 RWQCB).
2.6.1 No-Flow/Low-Flow Rates
The purging or sampling flow rate of 100 ml/min to 200 ml/min is expected to be attainable in
the lithology adjacent to the SGA well. To evaluate whether the lithology adjacent to the SGA
well may cause no4low or low-flow conditions, a vacuum gauge or similar device will be used
1 between the soil gas sample tubing and the soil gas extraction devices. A gas tight syringe
may also be used to qualitatively determine if a high vacuum soil condition exists, which is
based on whether suction is felt while the plunger is being withdrawn.
2.6.2 Purging/Sampling Rates
' E2C will conduct purging/sampling at rates between 100 to 200 ml/min to limit stripping, prevent
ambient air from diluting the soil gas samples, and to reduce the variability of purging rates.
The low flow purge rate increases.the likelihood that representative samples will be collected.
The purge/sample rate may be modified based on conditions encountered in individual SGA
wells. Modified rates will be documented in the report of findings..
2.7 Soil Gas Sampling Protocol
After the SGA well is adequately purged, samples will be collected with Summa canisters fitted
with flow restrictors. A flow regulator will be placed between the probe and the Summa canister
to ensure the canister is filled at the proper flow rate. Summa canisters will be stored in such a
way as to avoid exposure to sunlight, and the samples will be analyzed within the hold time.
2.7.1 Sample Container Cleanliness and Decontamination
Prior to its use at a site, each sample container will be assured ,clean by the analytical
' laboratory. New containers will be determined to be free of contaminants (e.g., lubricants) by
either the supplier or the analytical laboratory; and the effectiveness of decontamination (to
detect any possible interference from ambient air) of reused/recycled containers will be verified
with method blanks. After each use, reusable sample containers will be properly
' decontaminated. Glass syringes or bulbs will be disassembled and baked at.240° C for a
minimum of 15 minutes or at 120° C for a minimum of 30 minutes, or be decontaminated by an
equivalent method. Plastic syringes, if used, will be used only once and then properly
' discarded.
E2C personnel will connect new Teflon® tubing to the top of the existing SGA well tubing, and
' will utilize a 60 cubic centimeter (cc) syringe and a 3-way valve to purge the previously
determined purge volume. The purge volume will be calculated based on one (1) cc/ft for 1/8"
outside diameter (OD) tubing and five (5) cc/ft for 1/a" OD tubing.
The leak compound will be placed in tent-type structures at the connections on the sampling
train, with a paper towel (moistened with the leak compound) wrapped with plastic sheeting
taped tightly at each end to seal the structure. The sampling procedure will then commence as
detailed above.
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Proiect Number 1812BK45 ,October•20.2008
2.7.2 Documentation of SGA Well Sampling Protocol
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E2C personnel will document the SGA well sampling, and,will include the sample identification,
the probe location, date and time of sample collection, sampling depth, identity of on-Site
personnel, weather conditions, sampling methods and devices, soil gas purge volumes, volume
of soil gas extracted, vacuum of canisters before and after samples are collected, chain of
custody protocols.
2.7.3 Chain of Custody Records
A chain of custody form will be completed to maintain the custodial integrity of samples. Probe
installation times and sample collection times will be included on the chain of custody form, and
in the report of findings.
2.8 Analysis of Soil Gas Samples
2.8.1 Quality AssurancelQuality Control(QA/QC)
The soil gas analytical laboratory will comply with the project Quality Assurance Project Plan
(QAPP) and will follow the QA/QC requirements of the most current ASGI and the employed
EPA Method. If,there is any inconsistency between the ASGI and the EPA Method, the most
restrictive and specific requirements will prevail. The analytical data will be consistent with the
Data Quality Objectives (DQOs) established for the project. Field QC samples will be collected,
stored, transported and analyzed in a manner identical to the site samples.
QA/QC samples will be collected to support the sampling activity. Method blanks will be used
to verify the effectiveness of decontamination procedures, as specified in Section 6.6.1, and.to
detect any possible interference from ambient air. For off-site shipments, a minimum of one (1)
trip blank per day will be collected and analyzed for the target compounds. Trip blanks will
contain laboratory grade ultra pure air. The trip blanks will be prepared to evaluate if the
' shipping and handling procedures are introducing contaminants into the samples, and to
determine if cross contamination in the form of VOC migration has occurred between the
collected VOC samples. Trip blank containers and media will be the same as site samples. At
' least one (1) duplicate sample per laboratory per day will be collected. Duplicate samples will
be collected from areas of concern in separate sample containers, at the same location and
depth. Duplicate samples will be collected immediately after the original sample. Laboratory
' control.samples (LCS) and dilution procedure duplicates (DPD) will handled and analyzed, in
accordance with the most recent ASGI (Sections 3.5.0 and 3.12.4, respectively). E2C will be
prepared to collect split samples (for analysis by another laboratory) with the RWQCB,. if
' requested.
2.8.2 Laboratory Certification and Analysis
As the USTs were installed in 1983 (removed in 2003), and based on a discussion with the
RWQCB (oral communication, October 16, 2008), E2C will have the samples analyzed by EPA
Methods 8260b and TO-15 at a certified analytical laboratory.
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Proiect Number 1812BK45 October 20,2008
2.8.3 Detection Limits for Target Compounds
Analytical equipment calibration will"be in accordance with the most current ASGI. Anticipated
' detection limits are as follows:
Region 2 ESL's or OEHHA Values
' CHEMICAL Micrograms per cubic Parts per billion— Micrograms per liter
meter /m3) volume by /L
Naphthalene 3.2E+01 6.1 0.032
t1,2-DCA 5.0E+01 12.35 0.036
Benzene 3.6E+01 11.27 0.036
TBA 2.6E+03 857.7 2.6
MTBE 4.0E+03 1,109 4.0
TPH-G 2.6E+04 7,376 26
Toluene 6.3E+04 16,719 63
X lenes 1:5E+05 34,404 150
Ethyl-benzene 4.2E+05 96,731 420
The DL for leak check compounds will be 10 µg/L or less. For results with a high DL reported
(e.g., due to matrix interference or dilution), the laboratory will provide a written explanation.
Re-sampling and analyses will be conducted at the appropriate DL for a specific compound if
1 requested by the RWQCB.
2.8.4 Sample Handling
Exposure to light and changes in temperature and pressure will accelerate sample degradation.
To protect sample integrity soil gas samples will not be chilled, will not be subjected to changes
in ambient pressure, and shipping of sample containers by air will be avoided, if possible. If
' condensation is observed in the sample container, the sample will be discarded and a new
sample will be collected.
2.8.5 Holding Time
All soil gas samples will be collected in Summa canisters and will. be analyzed at Provera
Analytical Laboratories, Inc. (State Certification #2606) in Bakersfield, California within 48 hours
after collection.
2.8.6 Analytical Methods
All VOC samples will be analyzed using only a Gas Chromatograph/Mass Spectrometer
(GC/MS) by EPA Method 8260b and EPA Method TO-15 (or equivalent).
2.8.7 Target Compounds
The ASGI (dated February 25, 1997) includes 23 primary and four (4) other target VOCs. All
quantifiable results will be reported. The estimated results of all Tentatively Identified
Compounds (TICs) or non-AGSI-targeted compounds detected will be included in the report of
findings. If TICs or non-ASGI targeted compounds are identified, E2C will consult with the
RWQCB to determine whether additional action is required (e.g., running additional standards
to quantify TICs or non-ASGI compounds) and whether the use of these estimated data for risk
' evaluation is appropriate. All quantifiable results of Leak Check Compounds will be reported as
specified in Section 6.4.4. Based on the site history and conditions (e.g., USTs) soil gas
samples.will also be analyzed for oxygenated compounds [e.g., methyl tertiary-butyl ether
(MtBE), ethyl tertiary-butyl ether (EtBE), di-isopropyl ether (RIPE), tertiary-amyl methyl ether
(TAME), tertiary-butyl alcohol (TBA), and ethanol]. Note: The USTs were installed in 1983,
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after leaded 'compounds .had'been banned from gasoline blends. Therefore, E2C will not
analyze the soil gas investigation samples for these compounds.
1 2.9 Health Risk Investigation
When the soil gas ,investigation is conducted, if fuel hydrocarbons are . reported at
concentrations of,concern, a health risk-based investigation.will big.conducted and reported..
3.0 LIMITATIONS AND REPORT CERTIFICATION
' This Workplan has . been prepared by E2C under the professional supervision of. the
Professional whose seal and signature appear-herein. The conclusions.'of this report are based
solely, on the Scope of Services outlined and the sources of information referenced in this
1 report: Any additional, information,thaf becomes available'concerning the Site should
submitted to E2C so that our, conclusions:may reviewed and modified, if .necessary. This
report.was prepared for.the sole;use of Mr: Frank Hobin •and/or agent(s), the RWQCB and the
BFD.
Prepared,By: SS%ONAt GF0
Zo
Frank Stott #8158 y�, ..else , a
Project Geologist cAVf°�.
Reviewed By: �
1
William.A. Lawson, G #7171 *.
1 Ma;ft7�
Director of Technical 0 rations
OF
E2C Remediation 9
1
Project Number 1812BK45 October 20.2008
f
ATTACHMENTS
tFigure 1 — Site Location,
Figure 2 - Site Plan with.Soil Gas Sampling Locations
Figure 3 - Typical Soil Gas, Well Construction Diagram
1
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E2C Remediation Attachments
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LEGEND
MW-3 Groundwater Monitoring
' 2 Well
MW-1 Vapor Extraction Well Location
B-4 1999 Soil Boring Location
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B-6 2003 Soil Boring Location
B-5 .x
Q HA Hand Auger Boring.Location
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MW-3
UST Underground Storage Tank
Auto Detailing SV-3
' Center ® Soil Vapor Sampling Locations
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• E2C Remediation FORMER NIAGARA CARWASH
' 5300 Woodmere Dr., Suite 105 1701 STINE ROAD FIGURE
Bakersfield, CA 93313 BAKERSFIELD, CALIFORNIA
' Phone:.(661)831-6906 SITE PLAN WITH SOIL GAS 2
Fax: (661)831-6234 SAMPLING LOCATIONS
1 1
Removable Cap
1 •
Well Box Set in Concrete
1
1
Ben tonite grout
1
6.0-inches bentonite(hydrated)
"°
1/8-inch diameter nylon tubing
Lonestar#3 Sand
Total SGA Well Depth:
- or Equivalent
5 Feet <:
4.0-inch diameter boring
Filter Pack:
4_ 1.5-inch soil gas screen
12 inches
(6 inches below screen,
RT
t 6 inches above screen)" `_'` _'.
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NOT TO SCALE
E,C Remediation FORMER NIAGARA CARWASH
5300 Woodmere Dr., Suite 105 1701 STINE ROAD NGUR E
Bakersfield, CA 93313 BAKERSFIELD, CALIFORNIA
Phone: (661) 831-6906 TYPICAL SOIL GAS WELL
Fax: (661) 831-6234 . DIAGRAM