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QuarterlyGround-ater Monitoring Report
<br /> Former E-Z Serve Location 100966
<br /> . 2537 Waterloo Road
<br /> Stockton California
<br /> Delta Project No RPMSO-966
<br /> Page 2
<br /> 20 GROUNDWATER MONITORING DATA
<br /> 2 1 Groundwater Gaut=iny__and Sampling
<br /> Delta subcontracted Doulos Environmental, Inc (Doulos)to perform groundwater monitoring activities at
<br /> this site On October 5, 2004, Doulos personnel mobilized to the site to conduct groundwater monitoring
<br /> activities Prior to purging, the monitoring wells were gauged for liquid phase hydrocarbons (LPH) and
<br /> depth to water utilizing an oil water interface probe Groundwater ranged from 62 25 feet to 63 18 feet
<br /> below top of casing Monitoring wells MW-9, MW-10, MW-11, MW-1, MW-12, MW-13, MW-14 and
<br /> MW-16 were measured to be dry No LPH was detected in any of the monitoring wells during the
<br /> October 5, 2004 gauging activities Depths to groundwater and groundwater elevations are presented in
<br /> Table 1, Groundwater Analytical Data
<br /> Prior to sampling, the monitoring wells were purged by removing approximately three well volumes of
<br /> water Monitoring wells MW-15, MW-17, VW-1 and VW-2 were purged utilizing disposable
<br /> polyurethane bailers Monitoring wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8,
<br /> EX-1 and VW-3 were purged utilizing a submersible pump Once the wells had been purged, they were
<br /> sampled utilizing disposable polyurethane bailers The groundwater samples collected were decanted into
<br /> properly labeled, laboratory prepared sample containers and placed on ice for storage prior to transporting
<br /> to the laboratory The samples were transported, under strict chain-of-custody protocols, to Kiff
<br /> Analytical LLC of Davis, California, for analysis for benzene, toluene, ethyl-benzene, total xylenes
<br /> (BTEX), total petroleum hydrocarbons (TPH) in the gasoline range, methyl tert butyl ether (MTBE),
<br /> diisopropyl ether(DIPE), ethyl tert butyl ether(ETBE),tert-amyl methyl ether(TAME), tert butyl alcohol
<br /> (TBA),methanol,ethanol, 1,2-Dichloroethane, and 1,2-Dibromoethane by EPA Method 8260B
<br /> 22 Analytical Data
<br /> Laboratory chemical analyses on the groundwater samples collected on October 5, 2004 show that
<br /> benzene concentrations have remained below laboratory reporting limits (BRL) in monitoring wells MW-
<br /> 1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8, MW-15 and MW-17, have decreased in
<br /> monitoring wells EX-1, VW-1 and VW-3, and have increased in monitoring well VW-2 Benzene
<br /> concentrations ranged from BRL in monitoring wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-6,
<br /> MW-7, MW-8, MW-15 and MW-17 to 4,200 pglL in monitoring well VW-1 Reported MTBE
<br /> concentrations have remained BRL in monitoring wells MW3, MW-8, MW-15 and MW-17, have
<br /> decreased in monitoring wells MW-4, MW-6, EX-1, VW-1 and VW-3, and have increased in monitoring
<br /> S\Remediation UnttlActive Chents\Restructure Petroleum\Project Files\100966 2537 Waterloo Road\GWM\3rd Q 20041100966
<br /> QMR doc
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