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RECEIVED <br /> ' <br /> Q Y Report ort - December 1999 MAR 2 9 2000 <br /> P <br /> CHAPIN BROTHERS, INC ENMRONMENiAL HEALTH <br /> ' 1766 Monte Diablo Avenue, Stockton, California PERMIT I SERVICES <br /> 10. INTRODUCTION <br /> At the request of Mr Russell Chapin, Advanced GeoEnvlronmental, Inc (AGE) has prepared this <br /> ' Quarterly Report of field activities conducted during the fourth quarter of 1999 at 1766 Monte <br /> Diablo Avenue, Stockton, California <br /> ' The site setting is illustrated in Figure 1 Structures and well locations on or near the site are <br /> illustrated in Figure 2 Quarterly ground water monitoring activities were conducted on 29 December <br /> 1999 <br /> Site history and findings from previous investigations and monitoring events at the site are <br /> summarized in Problem Assessment Report (PAR) prepared by Science & Engineering Analysis <br /> t Corporation (SEACOR) dated 22 July 1994 and in Quarterly Report-September 1995, prepared by <br /> AGE, dated 03 October 1995 <br /> ' 2.0. PROCEDURES <br /> • Ground water monitoring and soil sampling activities were performed in accordance with guidelines <br /> established by the San Joaquin County Public Health Services - Environmental Health Division <br /> ' (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) and were <br /> performed in accordance with the approved Work Plan Addendums, variously dated 07 April 1997, <br /> 10 May 1999 and 05 July 1999 <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 29 December 1999, a Solinst water level meter was used to measure the depth to ground water <br /> in monitoring wells MW-1 through MW-6, and vapor wells VE-1 and VE-6, relative to the tops of <br /> ' the well casings (Table 1) <br /> After recording the depth to ground water measurements, monitoring wells MWA through MW-6 <br /> ' and vapor wells VE-1 and VE-6 were purged using a two-stage purge pump A minimum of three <br /> well-volumes of water was removed from near the top of the water in each well Temperature, pH <br /> and conductivity of purged ground water were measured at two-, three- or five-gallon intervals using <br /> an ICM model 52200 water analyzer Dissolved oxygen concentrations in ground water were <br /> measured using a YSI-55 dissolved oxygen meter <br /> ' The purge pump was washed in an Alconox solution and rinsed with tap water prior to purging each <br /> well Purged water was stored in 55-gallon drums on the site Field measurements of purged ground <br /> water are included in Appendix B <br /> ' Advanced GeoEnvironmental,Inc <br />