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Quarterly Report=Third Quarter 2002 <br /> ' CALIFORNIA FUELS CARDLOCK STATION <br /> 2402 Pacific Aye.nue, Stockton, California <br /> - <br /> 1.0. INTRODUCTION - J J <br /> .f, At the,request of Mr. David,.Atwater,-Advanced.GeoEnvironmental, Inc: (AGE) has.prepared this <br /> T _—quarterly.repdrt of ground water monitoring and soil remediation.activities for 2402 Pacific'Avenue, <br /> - Stockton, California..The objectives of the site .activities were to xnomt6t dissolved petroleum <br /> = = ;hydrocarbon concentrations in groundwater,to assess.ground water flow direction and gradient and <br /> to monitor the progress,and effectiveness of soil vapor extraction (SVE) and in-situ air sparging: ` <br /> _ (IAS). remediation _at' the site. The, site -setting is illustrated onFigure1. Site structures and <br /> ` monitoring:well locations are depicted on Figure 2: :f - _ <br /> :This report has been prepared in accordance with guidelines issued-bythe California Regional.Water ` <br /> Quality Control Board(RWQCB)-Central,Valley Region for investigation of underground storage <br /> s -tank(UST)sites.A summary of previous investigations at the site was-included in the AGE' re' ared <br /> p p <br /> Corrective Action Plan-May 1998,dated 05 May 1998.Analytical data-acquired to date is included <br /> -in this report _ . _ P - <br /> 2.0. GROUND WATER MONITORINGAND.SAMPLING:PROCEDURES' <br /> ' On 20 September 2002;ground water monitoring was performed at the site on well&MW-1 through =j <br /> .R <br /> 'MW-12 and air sparge wells.AW=I-A, AW-IB,;AW-2A and AW-2B (AW-IA through AW-2B): <br /> Ground water-samples,were not collected from well MW-13 which was damaged due-to_casing <br /> - .separation; AGE submit-ted a letter.to the San-Joaquin County Environmental Health Department <br /> (SJCEHD);•dated 25 June 2002,detailing the damage:-Ground water monitoring procedures for the. 4 <br /> site were outlined in 'Work Plan.Addendum, dated .16.May 2000 and conform to-ground water . <br /> ) <br /> -monitoring guidelines-issued,Wthe.SJCEHD..,As-built.construction details of all monitoring wells - <br /> '-� are-summarized-in Table 4..-:-'- <br /> A. <br /> 1. f: <br /> w t <br /> x 2.1. WELL-.MONITORING.AND E_EVACUATION.PROCEDURES <br /> x - <br /> r The-depth to ground water was measured at each well from the taps of thewell casings to the neatest a <br /> r <br /> 0:01,=foot,utilizing a Solinist waterlevel meter. Ground water elevationat-the site was calculated by <br /> t subtracting the measured depth to-groundwater from the surveyed well-casing elevations(Tabled). . = <br /> - ;Ground water_ elevations were-plotted and contoured on a scaled site map (Figure 3).' <br /> Y 'After waterleveN were measured;approximately 4 to:10.gallons 'oground water(a minimum of - :,1 <br /> three casing-water. volumes-- per: well) 'were_;evacuated :(purged)-from each.:Weill utilizing a <br /> polyethylene disposable-bailer; approkimately.'/i.-gallon of ground water was removed from well. l <br /> MW711 before being purged "dry". Temperature,"pH arid_- conductivity'of purged water were <br /> 4� z5 • - ..Sl,-r_ ..yr+..aw. <br /> _ <br />