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' 02 June 1999 <br /> AGE-NC Project No 97-0326 <br />' Page 4 of 7 <br />' 35 MONITORING WELL PURGE PROCEDURES <br /> On 16 December 1998, a Solrnst water level meter was used to measure the depth to ground water <br />' <br /> in monitoring wells MW 1 through MW3, relative to the tops of the well casings The ground water <br /> elevations and gradient were determined from these data(Table 2) <br />' After recording water level measurements, a stainless steel bailer was used to remove sediment from <br /> each well A two-stage submersible pump was then used to purge each well of standing water and <br /> to develop the new wells Approximately 8 to 10 gallons of water were removed from each well <br />' Ground water temperature, pH and conductivity were measured at regular purge-volume intervals <br /> during purging using an ICM water analyzer Field sheets and data are included in Appendix D <br /> Purged water was stored on-site in labeled, 55-gallon DOT-approved drums <br /> 1 <br />' 36 COLLECTION OF GROUND WATER SAMPLES <br /> The depth to ground water was measured in each well following purging to assure a minimum of <br />�. 80% recharge prior to sampling Water samples were then collected using new disposable plastic <br /> bailers Each water sample was transferred Into 40-m1 VOA vials containing 0 5 ml 18% <br /> hydrochloric acid as a sample preservative After collection, the samples were properly labeled, <br /> placed In a chilled container and transported under chain-of-custody to AAL Each sample was <br /> analyzed for TPH-g, BTEX and oxygenated compounds in accordance with methods noted in section <br /> 34 <br /> 37 SURVEYING <br /> On elevations of wells MW 1 through MW3 were surveyed to the nearest <br /> O 11 January 1999, the casing e g y <br /> 0 01-foot relative to mean sea level as established at a City of Stockton Bench Mark (Table 2) <br /> Surveying was performed by Baumbach & Piazza, Inc The survey report sheet is included in <br /> Appendix C <br /> 1 <br /> 4.0. FINDINGS <br />' Findings regarding site stratigraphy and ground water conditions were determined from field data, <br /> findings regarding hydrocarbons in soil and dissolved hydrocarbons in ground water are reported <br />' from the laboratory report <br /> • <br /> Advanced CeoEn ironmental,Inc <br />