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t l <br /> Quarterly Report -December 1997 <br /> Former STOCKTON PLATING Facility <br /> 632 South EI Dorado Street, Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with 'the request of R and L Business Management of Stockton, Advanced - <br /> GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report of ground water monitoring <br /> activities performed at 632 South El Dorado Street, Stockton, California(the site) This report details <br /> the collection of ground water samples from the site on 12 December 1997 and the results of the <br /> laboratory analyses of the samples The site and its surroundings are illustrated in Figure 1 <br /> Location Map The locations of structures and monitoring wells on the site aie depicted in Figure <br /> 2 - Site Plan , <br /> I , <br /> Monitoring and sampling were performed in accordance with guidelines established by the San <br />' Joaquin County Public Health Services-Environmental Health Division(PHS-EHD)and the Central <br /> 4 Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground <br /> storage tank(UST) sites <br /> Background information, including details of previous site assessment work, was presented in the <br /> March 1996 Quarterly Reports dated 05 April'1996 and in the Corrective Action Plan - December <br /> 1995, prepared by AGE <br />' 2.0. PROCEDURES <br /> I21 - MONITORING WELL PURGINGTROCEDURES <br /> On 12 December 1997, a Solinst water level meter was used to measure the depth to ground water <br />' in all monitoring wells (MW-1 through MW-5) and vapor wells screened in ground water (VW-1 <br /> through VW-4) at the site The relative ground water elevation in each monitoring well and the <br /> hydraulic gradient were determined from these data points <br /> After ground water depth measurements, a mimmum of three well volumes of water were removed" <br /> from wells MW-4 and MW-5 and VW-1 through VW-4 using a submersible pump Approximately <br />' 6 to S gallons of water were removed from each two-inch diameter well (MW-4, MW-5 and VW-I <br /> through VW-4), Stabilizing temperature, pH, and conductivity were measured in purged water at <br />' regular purge volume intervals using an ICM water analyzer Monitoring well stabilization data and <br /> field data sheetsare mcluded in Appendix A Purged water was stored on-site in labeled 55-gallon <br /> drums ` <br />' Advanced GeoEnvironmentai,Inc <br /> 1 <br />