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s <br /> r <br /> Quarterly Report - September 1998 , <br />' GRANT LINE GAS,& FOOD <br /> 2420 Grant Line Road, Tracy, California <br />' 1.0. INTRODUCTION <br /> O UCTION <br /> At the request of Mr Joe Toste Jr , Advanced GeoEnvironmental, Inc (AGE), has prepared this <br /> Quarterly Report for the field activities performed at 2420 Grant Line Road, Tracy, California The <br /> site setting is illustrated in Figure 1 Monitoring well locations on the site are illustrated in Figure <br />' 2 A detailed background of previous work performed at the site was presented in the Quarterly <br /> Report- December 1996, dated 28 February 1996, prepared by AGE <br /> I ' <br /> 20. PROCEDURES <br />' The quarterly ground water monitoring event was conducted on 28 September 1998 The quarterly <br /> monitoring and sampling was performed in accordance with Central Valley Regional Water Quality <br />' Control Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental <br /> Health Division(PHS-EHD) guidelines for the subsurface investigation of underground storage tank <br /> (UST) sites <br /> 1 <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> The water level in each monitoring well was measured relative to the tops of the well casings using <br />' a Solinst water level meter After water levels were measured, a two-stage submersible pump was <br /> used to purge each well Three to four gallons (minimum of three well volumes) of water were <br /> removed from each well Temperature, pH and conductivity were measured at one-gallon intervals <br />' using an4CM water analyzer during purging, and the values had generally stabilized by the end of <br /> the purging process (Appendix A) Purged water was stored on-site in 55-gallon, DOT-approved <br /> drums <br /> 2 2 ` COLLECTION OF GROUND WATER SAMPLES <br />' Prior to collection of ground water samples,the depth to ground water was measured in each purged <br />' well to ensure that a minimum of 80% of the well volume had recharged Water samples were <br /> collected from each well using a new disposable plastic bailer Each water sample was transferred <br /> into three chilled 40-m1 VOA vials containing 0 5 ml 18%HCl as a sample preservative and into one <br />' 1-liter amber bottle After collection, the samples were labeled and placed in a chilled container for <br /> transportation under chain-of-custody to McCampbell Analytical, Inc (MAI), a California <br /> Department of Health Services (DHS)-certified analytical laboratory located in Pacheco, California <br />' Each sample was analyzed for <br /> Advanced GeoEnvironmental Inc <br /> 1 ` <br />