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lie Quarterly Report - First Quarter 2002 <br /> CHAPIN BROTHERS, INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> ' 10 INTRODUCTION <br /> At the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report for the site=located at 1766 Monte Diablo Avenue, Stockton, California The site <br /> setting is illustrated in Figure 1 Structures and well locations on or near the site are illustrated in <br /> ' Figure 2 Quarterly ground water monitoring activities were conducted on 26 January 2002 <br /> Background information and a description of prior investigations at the site are included in the <br /> Problem Assessment Report (PAR) prepared by Science & Engineering Analysis Corporation <br /> (SEACOR) dated 22 July 1994 and in the AGE-prepared Quarterly Report -June and July 1999 <br /> dated 08 September 1999 Quarterly monitoring data from January 1994 to the present is <br /> ' summarized in Tables 1 and 2 in this report <br /> ' 2.0. PROCEDURES <br /> . Ground water monitoring activities were performed in accordance with guidelines established by the <br /> ' San Joaquin County Environmental Health Department (EHD) and California Regional Water <br /> Quality Control Board-Central Valley Region(CRWQCB)and were performed in accordance with <br /> procedures described in the approved work plan addendums dated 07 April 1997, 10 May 1999 and <br /> ' 05 July 1999 <br /> ' 2 1 WELL MONITORING AND EVACUATION <br /> ' On 25 January 2002, a Solmst water level meter was used to measure the depth to ground water in <br /> monitoring wells MW-1 through MW-7 relative to the tops of the well casings (Table 1) <br /> ' On 26 January 2002, monitoring well MW-1 was evacuated using a two-stage purge pump <br /> Monitoring wells MW-2 through MW-6 were evacuated utilizing dedicated, disposable Teflon <br /> bailers A minimum of three casing water-volun-ies were removed from each well Monitoring well <br /> ' MW-7 was not purged due to limited access problems, but was sampled on verbal approval of the <br /> EHD Temperature,pH and conductivity of purged ground water were measured at regular intervals <br /> using an Oakton water analyzer <br /> The purge pump was washed in an Alconox solution and rinsed with tap water prior to purging <br /> Purged water was stored in 55-gallon drums on the site Field measurements of purged groundwater <br /> ' are included in Appendix A <br /> i <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />