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Gregg 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 April 16,2004 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 8"EXTRACTION WMC <br /> E�LgL��fp�G CONDUIT q�/IpLE pp ry <br /> EXISTING <br /> POINTOR UNTREAT&GROUNDWATE9 BAKER Al <br /> EXISTING 'X 20 BELOW GROUND CONC.VAULT <br /> .25"DISCHARGE LINE TO BAKER TA <br /> C T IST G C ROAD <br /> BAKER TANK 21,060 <br /> CARBON CANISTER <br /> E PUMP VOL.=+1-12 GPM MAX <br /> L AT-W.T.9-45' <br /> GENERAL SCHEMATIC SKETCH OF PUMP&TREAT SYSTEM <br /> FOOTHILL ENGINEERING LODI.CA <br /> Over the Memorial Day weekend the pump and treat system was turned off to allow the ground water to <br /> . recharge and to recollect any contaminants that might of stuck to the soil particles during draw down. <br /> The pump and treat system resumed on Monday afternoon 5/31/04. The pump and treat system was <br /> turned off for final closure on June 16, 2004 and final samples of the monitoring wells were taken June <br /> 17, 2004. The well pump and tank and filters were removed on Tuesday, June 22, 2004. <br /> Quarterly monitoring has resumed with the Third Quarter of 2004,September 17,2004. The first Quarter <br /> of 2005 was not sampled as we were waiting for a determination of acceptance. The determination was <br /> made to sample again with the higher groundwater table of this spring, spring of 2005. <br /> FINDINGS AND RECOMMENDATIONS FOR THIS EVENT <br /> Sampling Procedure <br /> On May 31, 2005, Del-Tech Geotechnical Services, under the supervision of Foothill Engineering <br /> performed the second quarter groundwater monitoring event for 2005. Marcel Delacruz of Caltrans was <br /> notified of the monitoring event , as required by Caltrans Permit No.1002-6NV-0218. All wells had <br /> enough water to purge and sample. MW-4 was pumped dry then allowed to recharge for sampling. All <br /> wells were purged at a rate of .5 gpm. 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). Monitoring wells that did not receive a full purge are marked <br /> with an asterisk (*}. <br /> 2 <br />