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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 wel 1, 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 />;ISTING 6" EXTRACTION WELL <br />EXISTING 4" CONDUIT DIS HARG SAM LE PAoINT BAKER Af <br />`SAMPLE POINT FOR UN REATEb GR�UNDWATE� f 7 <br />\`EXISTING 12' X 2(P BELOW GROUND CONC. VAULT <br />\ .-1.25" DISCHARGE LINE TO BAKER TA <br />BAKER TANK 21,OOo <br />\—CARBON CANISTER <br />1 HP SUBMERSABLE PUMP VOL.= +/- 12 GPM MAX <br />80' EXTRACTION WELL AT -W.T. ® -45' <br />GENERAL SCHEMATIC SKETCH OF PUMP & TREAT SYSTEM <br />FOOTHILL ENGINEERING LOCI, CA <br />Over the Memorial Day weekend the pump <br />and treat system was turned off to allow the ground water to recharge and to recollect any contaminants <br />10) that might of stuck to the soil particles during draw down. The pump and treat system resumed on <br />Monday afternoon 5/31/04. The pump and treat system was turned off for final closure on June 16, 2004 <br />and final samples of the monitoring wells were taken June 17, 2004. The well pump and tank and filters <br />were removed on Tuesday, June 22, 2004. <br />Quarterly monitoring has resumed with the Third Quarter of 2004, September 17, 2004 <br />FINDINGS AND RECOMMENDATIONS FOR THIS EVENT <br />Sampling Procedure <br />On December 15, 2004, Del -Tech Geotechnical Services, under the supervision of Foothill Engineering <br />performed the fourth quarter groundwater monitoring event for 2004. Marcel Delacruz of Caltrans was <br />notified of the monitoring event, as required by Caltrans Permit No. 1002-6NV-0218. Only EW -1 and <br />GMX-1 had enough water for a complete purge. EW -1 was purged at 1 gpm by a dedicated Watera <br />Inertia Pump. GMX-1 was purged at .5 gpm by a dedicated Watera Inertia Pump. Monitoring well MW -2 <br />and MW -3 had only enough water for a single grab sample and were not purged. Monitoring well MW -2 <br />and MW -3 were sampled by hand with a dedicated Watera Inertia Tube. Monitoring well MW -4 was dry <br />and a sample was not taken. Samples were transported on ice for delivery under chain of custody to <br />GeoAnalytical Laboratories for analysis. <br />Sample Analysis <br />Water samples were analyzed by EPA methods 5030/LUFT for TPHg and 8260B for BTEX and <br />�1 Oxygenates. Results of all sample analyses are attached in the original laboratory form and also in recap <br />form (See Water Sample Analysis Recap attached). Monitoring wells that did not receive a full purge <br />are marked with an asterisk (*). <br />2 <br />