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Quarterly,Groundwater Monitoring Report_
<br /> Former E-Z Serve Location 100966
<br /> 2537 Waterloo Road
<br /> Stockton,California
<br /> . Delta Project No RPMSO-966 Page 2
<br /> 2.0 GROUNDWATER MONITORING DATA
<br /> 21 Groundwater Gauggiag and Sampling
<br /> Delta Environmental Consultants, Inc (Delta) performed groundwater monitoring activities at this site on
<br /> June 10, 2005 Prior to purging, the monitoring wells were gauged for liquid phase hydrocarbons (LPH)
<br /> and depth to water utilizing an oil water interface probe Groundwater ranged from 50 39 (MW-2) feet to
<br /> 53 70 (1\4W-8) feet below top of casing No LPH was detected in any of the monitoring wells during the
<br /> June 10, 2005 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 were purged utilizing a submersible pump Once the wells had been purged,
<br /> they were sampled utilizing disposable polyurethane bailers The groundwater samples collected were
<br /> decanted into properly labeled, laboratory prepared sample containers and placed on ice for storage prior
<br /> to transporting to the laboratory The samples were transported, under strict chain-of-custody protocols,
<br /> to Kiff Analytical LLC of Davis, California, for analysis of benzene, toluene, ethyl-benzene, total xylenes
<br /> (BTEX), total petroleum hydrocarbons (TPH) in the gasoline range, methyl tert butyl ether (MTBE),
<br /> dusopropyl 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 /> I
<br /> 22 Analytical Data
<br /> Laboratory chemical analysis of the groundwater samples collected on June 10, 2005 indicates that
<br /> benzene concentrations have remained below laboratory reporting limits in monitoring wells MW-2,
<br /> MW-4, MW-5, MW-6, MW-8, MW-13, MW-15, MW-16 and MW-17, have decreased in monitoring
<br /> wells VW-1, VW-2 and EX-1, and have increased in monitoring well MW-3 and MW-7 The highest
<br /> benzene concentration was 7,100 pg/L in monitoring well VW-1 MTBE concentrations were below
<br /> laboratory reporting limits in monitoring wells MW3, MW-4, MW-5, MW-7, MW-8, MW-15 and MW-
<br /> 17 Levels of MTBE have decreased in monitoring wells MW-1, MW-2, MW-9, MW-10, MW-14, VW-2
<br /> and EX-1, and have increased in monitoring wells MW-6, MW-11, MW-12, MW-13, MW-14, MW-16
<br /> and VW-1 The highest MTBE concentration was 140 µg/L in monitoring well EX-1 and VW-1
<br /> S\Remediation UnMActrve GhentslRestructure Petroleum\Project Files\100966 Stockton 2537 Waterloo Road\100966
<br /> 2nd05QMR doc
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