Laserfiche WebLink
1 <br /> Quarterly Report - Fourth Quarter 2001 <br /> CALIFORNIA FUELS CARDLOCK STATION <br />' 2402 Pacific Avenue, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Mr David Atwater,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report for 2402 Pacific Avenue, Stockton, California The site setting is illustrated on <br /> Figure 1 Site structures and monitoring well locations are depicted on Figure 2 <br /> The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water, to assess ground water flow direction and gradient and to monitor the progress and <br /> effectiveness of soil vapor extraction (SVE) and in-situ air sparging (IAS) remediation at the site <br /> This report has been prepared in accordance with guidelines issued by the California Regional Water <br /> Quality Control Board - Central Valley Division (CRWQCB) for investigation of underground <br /> storage tank(UST) sites <br /> A summary of previous investigations at the site was included in the AGE-prepared Corrective <br /> Action Plan- May 1998, dated 05 May 1998 Analytical data acquired to date is included in this <br /> report <br /> lie 2.0. GROUND WATER MONITORING AND SAMPLING PROCEDURES <br />' On 19 December 2001, ground water monitoring and sampling were performed at the site on wells <br /> MW-1 through MW-13 and wells AW-IA, AW-1B, AW-2A and AW-2B (AW-lA through <br /> AW-2B), as built construction details are summarized in Table 1 Ground water monitoring <br /> procedures for the site were outlined in Work Plan Addendum, dated 16 May 2000 and conform to <br /> ground water monitoring guidelines issued by the San Joaquin County Environmental Health <br /> Department (SJCEHD) <br /> 2 1 WELL MONITORING AND EVACUATION PROCEDURES <br /> The depth to ground water was measured at each well from the top of the well casing to the nearest <br /> 0 01-foot, utilizing a Solmst water level meter Ground water elevations at the site were calculated <br /> by subtracting the measured depths to ground water from the 5ui7veyed weii casing elevations <br /> (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 5 to 20 gallons of ground water (a minimum of <br /> three casing-water volumes per well) were evacuated (purged) from the wells utilizing either a <br /> polyethylene disposable bailer or a submersible pump Approximately 1'/z gallons of ground water <br /> were removed from well MW-11 and 12 gallons removed from well MW-13 before these wells were <br /> lie pumped "dry" Temperature, pH and conductivity of purged water were measured from each well <br />