|
Quarterly Groundwater Monitoring Reoort
<br /> Former L-Z Serve Location 100966
<br /> 2537 Waterloo Road
<br /> Stockton Califoi-ma
<br /> • Delta Project No RPMSO-966
<br /> Page 2
<br /> 2.0 GROUNDWATER MONITORING DATA
<br /> 21 Groundwater Gauging and Sam lin
<br /> Delta subcontracted Doulos Environmental, Inc (Doulos) to perform groundwater monitoring activities at
<br /> this site On December 29, 2004, Doulos personnel mobilized to the site to conduct groundwater
<br /> monitoring activities Prior to purging, the monitoring wells were gauged for liquid phase hydrocarbons
<br /> (LPH) and depth to water utilizing an oil water interface probe Groundwater ranged from 58 98 feet to
<br /> 59 85 feet below top of casing No LPH was detected in any of the monitoring wells during the
<br /> December 29, 2004 gauging activities Depths to groundwater and groundwater elevations are presented
<br /> in 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-9, MW-10, MW-11, MW-12, MW-14, MW-16, and VW-2 were purged
<br /> utilizing a centrifugal pump Monitoring wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7,
<br /> MW-8, MW-13, MW-17, EX-1 and VW-3 were purged utilizing a submersible pump There was no
<br /> purge method listed in the field notes for monitoring wells MW-15 and VW-1 Once the wells had been
<br /> • purged, they were sampled utilizing disposable polyurethane bailers The groundwater samples collected
<br /> were decanted into properly labeled, laboratory prepared sample containers and placed on ice for storage
<br /> prior to transporting to the laboratory The samples were transported, under strict chain-of-custody
<br /> protocols, to Kiff Analytical LLC of Davis, California, for analysis for benzene, toluene, ethyl-benzene,
<br /> total xylenes (BTEX), total petroleum hydrocarbons (TPH) in the gasoline range, methyl tert butyl ether
<br /> (MTBE), dilsopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert-amyl methyl ether (TAME), tent
<br /> butyl alcohol (TBA), methanol, ethanol, 1,2-Dichloroethane, and 1,2-Dibromoethane by EPA Method
<br /> 8260B
<br /> 22 Analytical Data
<br /> Laboratory chemical analysis of the groundwater samples collected on December 29, 2004 indicate that
<br /> benzene concentrations have remained below laboratory reporting limits in monitoring wells MW-1,
<br /> MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8, MW-13, MW-14, MW-15 and MW-17, have
<br /> decreased in monitoring wells VW-3, and have increased in monitoring well EX-1, VW-1 and VW-2
<br /> The highest benzene concentration was 3,300 µg/L in monitoring wells VW-1 and EX-1 MTBE
<br /> concentrations have remained below laboratory reporting limits in monitoring wells MW3, MW-8, MW-
<br /> 15 and MW-17, have decreased in monitoring wells MW-1, MW-2, MW-4, MW-5, MW-6 and MW-7,
<br /> S\Remediation Und\Act[ve Clients\Restructure Petroleum\Project Ftles1100966 2537 Waterloo Road\GWM\4th Qtr
<br /> 2004\100966 4th04QMR doc
<br />
|