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I <br /> 6 June 1995 <br /> I AGE-NC-95-0128 <br /> Page 2 of 4 <br /> I2 3 REMEDIATION <br /> It our understanding that a Corrective Action Plan (CAP), recommending soil vapor extraction, has <br /> been prepared for the site by Upgradient Environmental Upon approval of the CAP by the PHS- <br /> EHD, remediation activities are scheduled to be irutiated <br /> 3.0. PROCEDURES <br /> 3 1 MONITORING WELL PURGE PROCEDURES <br /> On 29 March 1995, a Sohnst water level meter was used to measure the depth to groundwater in the <br /> all wells The relative pzezometnc level in each well and hydraulic gradient were determined from <br /> these data (Table 1) Wells MW-2, MW-3 and VW-1 were then purged of approximately six to <br />' twelve gallons of water each (minimum of 3 well volumes) using clean PVC bailers Temperature, <br /> pH and conductivity were measured at 1-gallon intervals using an ICM water analyzer Monitoring <br /> well stabilization data and field sheets are included in Appendix A Purged water was stored on-site <br /> in 55-gallon drums, pending laboratory analysis <br />' 3 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new, clean, disposable plastic bailers <br />' Immediately upon retrieval, the samples were transferred into two, chilled 40-m1 EPA vials preserved <br /> with hydrochloric acid and I-liter amber bottles The samples were placed in a chilled container and <br /> transported under chain-of-custody to Alpha Analytical Laboratories, Inc in Ukiah, California Each <br /> sample was analyzed for total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and <br /> TPH-d)and volatile aromatics(benzene,toluene, ethyl benzene and xylenes BTE&X) in accordance <br />' with EPA methods 5030/8015m and 602, respectively <br /> 4.0. FINDINGS <br /> 4 1 GROUND WATER GRADIENT AND DIRECTION <br /> IThe depth to ground water at the site ranges from 44 20 to 44 42 feet The data indicates an average <br /> increased of ground water elevation of nearly 5 feet since December 1994 The increase in ground <br /> water elevation corresponds to an increased amount of precipitation, which the ground water basin <br /> received during the most recent wet season Ground water elevations are summarized on Table I <br />