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1 1 30 April 1996 ' AGE-NC Project No 95-0128 Page 2 of 4 ' in led at the site to re piping were instal lace the removed tanks p 24 REMEDIATION ' A Corrective Action Plan (CAP), recommending soil vapor extraction, was prepared for the site in 1994 by Upgradient Environmental The CAP has not received approval by the PHS-EHD and, therefore, no remediation activities have been initiated at the site 3.0. PROCEDURES 3 1 MONITORING WELL PURGE PROCEDURES IOn 07 March 1996, a Solinst water level meter was used to measure the depth to ground water in each monitoring well at the site The relative ground water elevation in each well and the hydraulic gradient were deterrmned from these data (Table 1) After ground water depth measurements, well VW-I was purged of 8 gallons of water (minimum of 3 well volumes) using clean PVC bailers Temperature, pH and conductivity were measured at 2- gallon intervals using an ICM water analyzer Monitoring well stabilization data and the field sheet is included in Appendix A Purged water was stored on-site in 55-gallon drums, pending laboratory analysts 32 COLLECTION OF GROUND WATER SAMPLES Upon stabilization, a water sample was collected from VW-1 using a new, clean, disposable plastic bailer Immediately upon retrieval, the sample were transferred into chilled 40-m1 EPA vials preserved with hydrochloric acid and a 1-liter amber bottle The sample was placed in a chilled container and transported under chain-of-custody to Alpha Analytical Laboratories, Inc (AAL) in Ukiah, California The sample was analyzed for total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d), volatile aromatics (benzene, toluene, ethyl benzene and xylenes BTE&X) and methyl tert-butyl ether(MTBE) in accordance with EPA methods 5030/8015m, 602 and 302 with an 8240 confirmation, respectively