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lie <br /> Quarterly Report - Fourth Quarter 2000 <br /> RAINWATER CAR WASH <br /> ' 420 West Yosemite Avenue, Manteca, California <br /> 1 0 INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the fourth quarter <br /> ' of 2000 for 420 West Yosemite Avenue,Manteca, California The site setting is illustrated on Figure <br /> 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 and to characterize ground water flow direction and gradient on the site This report is prepared <br /> ' in accordance with guidelines established by the California Regional Water Quality Control Board - <br /> Central Valley Region for investigation of underground storage tank (UST) sites Background <br /> information is summanzed in the Preliminary Investigation and Evaluation Report, dated 11 June <br /> ' 1999, prepared by AGE <br /> ' 2 0 GROUND WATER MONITORING AND SAMPLING PROCEDURES <br /> On 31 October 2000, ground water monitoring and sampling was performed at the site on wells <br /> MW-1, MW-2, MW-3, MW-4 and MW-5 Ground water monitoring procedures for the site were <br /> outlined in ff`ork Plan Addcndum - lugust 1999 dated 10 August 1999, prepared by AGE and <br /> approved by the PHS-EHD by letter dated 25 August 1999 <br /> 1 <br /> 1 MONI IORP\G WF-1 I PURG}- PROCEDURFS <br /> ' Depths to ground water were measured in each well from the tops of the well casings at the site to <br /> ' the nearest 0 01 foot utilizing a Solinst water level meter The ground water elevation in each �VNcll <br /> at the site was calculated by subtracting the measured depth to ground w ater from the surveyed <br /> casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map <br /> ' (FigurL 3) <br /> ,Vfler\%atc,r levels \\,cre measured, approximately G to 9 gallons ofground water(a minimum of three <br /> ' casing «ater-v olumes per well) were removed from wells MW-1, MVV-2, M\4-3 MW-4 and Mu'-5 <br /> utilising a teflon two-stage submersible, pump Temperature, pH and conductivity were measurLd <br /> for stabilization at regular purge-volume intervals from each well using a hydac eater analyici Field <br /> data and logs an. included w ith 4ppendiv A Purged ground water v x, containerised in 55-gallor <br /> drums and \,,a5 storc,d on-site in an area lasting genLial puhhc ICLC55 <br /> til an, ++ to ❑,{ W meld <br /> 1 <br />