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ff <br /> iGregg Drilling installed CPT#1 to a depth of 90 feet with soil and groundwater sampling to a depth of <br /> 78 feet on March 3,2003.Three samples of soil and three samples of the groundwater were extracted and <br /> analyzed. All CPT soil and groundwater samples were analyzed as non detect. <br /> On Apri11 b,2004 pump and treat remediation began with pumping the extraction well,pumping the water <br /> through an activated carbon filter,filling the tank, sample and testing the cleaned water,and trucking the <br /> water to the industrial sewer. Quality control samples were taken and analyzed weekly. <br /> EXISTING B"EXTRACTION WELL <br /> EXISTING UgCHJG <br /> SAPLOIN FOR � fiGMOUE DWNE <br /> IR BAKER Al <br /> EXISTING 17 X 20'BELOW GROUND CONC.VAULT <br /> 1.25"01 <br /> C IHSRG LINE ROABAKER TA <br /> BAKER TANK 21,000 <br /> CARBON CANISTER <br /> 1 HP SUBMERSABLE PUMP VOL.-+1-12 GPM MAX <br /> 80'EXTRACTION WELL AT W.T.0-45' <br /> GENERAL SCHEMATIC SKETCH OF PUMP&TREAT SYSTEM <br /> FOOTHLL ENGWEERING LOG.CA <br /> FINDINGS AND RECOMMENDATIONS FOR THIS EVENT <br /> Sampling Procedure <br /> On May 17, 2004, Del-Tech Geotechnical Services, under the supervision of Foothill Engineering <br /> performed a quarterly groundwater monitoring event. Marcel Delacruz of Caltrans was notified of the <br /> monitoring event,as required by Caltrans Permit No.1002-6NV-0218.All monitoring wells were vented <br /> and purged by standard of the industry methods(see Groundwater Field Report by Del-Tech Geotechnical <br /> Services, attached). GMX-1 was purged by hand,MW-2 had very little water and sample was collected <br /> by hand, MW-3 was purged at .2gpm, MW-4 had very little water and sample was collected by hand, <br /> EW-1 was sampled from the valve on the treatment system before the activated carbon filter. Pumping <br /> of groundwater samples were extracted from each monitoring well using the Watera Inertia Pump <br /> technique with dedicated sample tubes. Samples were transported on ice for delivery under chain of <br /> custody to GeoAnalytical Laboratories for analysis. <br /> Sample Analysis <br /> Water samples were analyzed by EPA methods 8015M for TPHg and 8260B for BTEX and Oxygenates. <br /> Results of all sample analyses are attached in the original laboratory form and also in recap form (See <br /> Water Sample Analysis Recap attached). <br /> Findings From Water Sample Analysis <br /> MTBE concentrations in monitoring wells EW-1,MW-2,MW-3,and MW-4 continue to be non-detect. <br /> Monitoring well GMX-1 has developed trace amounts of MTBE. TPHg has decreased dramatically in <br /> 10EW-1, GMX-1(92%), and MW-2. TPHg has remained non-detect in MW-3, and MW-4. BTEX <br /> compounds have decreased dramatically in EW-1, GMX-1(98%), and MW-2. The BTEX compounds <br /> remain non-detect in wells MW-3, and MW-4. <br /> 2 <br />