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S ; <br /> 1 Quarterly Report - Seconds Quarter 2001 <br /> • CHAPIN BROTHERS, INC. , ' <br /> ' 1766 Monte Diablo Avenue, Stockton, California " <br /> l <br /> 1.0. INTRODUCTION <br /> At the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> quarterly report of field activities conducted during the second quarter of 2001 at 1766 Monte Diablo <br /> ' Avenue,Stockton,California The site setting is illustrated in Figure 1 Structures and well locations <br /> on or near the site are illustrated in Figure 2 Quarterly,ground water monitoring activities were <br /> conducted on 03 May 2001 <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 /> Groundwater monitoring activities were performed in accordance with guidelines established by the <br /> • San Joaquin County Public Health Services -- Environmental Health Division (PHS-EHD) and <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) and were performed in <br /> accordance with the approved work plan addendums variously dated 07 April 1997, 10 May 1999 <br /> ' and 05 July 1999 <br /> i <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 03 May 2001, a Solinst water level meter was used to measure the depth to ground water in <br /> - monitoring wells MW-1 throughMW-6,and vapor well VE-6,relative to the'tops ofthe well casings <br /> (Table 1) <br /> ' After recording the depth to ground water measurements, monitoring wells MW-1 through MW-6 <br /> and vapor well VE-6 were purged using a two-stage purge pump A minimum of three casing water- <br /> volumes of water were removed from near the top of the water column in each well Temperature, <br /> ' pH and conductivity of purged ground water were measured at two- to seven-gallon intervals, as <br /> appropriate, using a Oakton water analyzer <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 A <br /> ' Advanced GeoEnvironmental,Inc <br />