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s <br /> 1 <br /> 4 <br /> Quarterly Report - Third Quarter 2001 <br /> WEST CLAY PROPERTIES <br />' 639 West Clay Street, Stdckton, California = r <br /> 1.0.a INTRODUCTION <br />' ' At the request-of Ms 'Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental, Inc <br /> ,(AGE)has prepared this quarterly report for the property located at 639 West Clay Street, Stockton, <br /> California The site and the surrounding area are illustrated in Figure 1 Structures,well and boring N <br />' locations are illustrated on Figure 2 <br /> This quarterly report has been prepared in accordance with Central Valley Regional Water Quality <br />' Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) <br /> sites Background information is summarized in Quarterly Monitoring Report and Data Summary- <br /> `L Decemher,1997 and Quarterly Report - October 1999;both prepared by AGE <br /> 2.0. PROCEDURES <br /> Fourteen single-completed and two dual-completed ground water monitoring wells and two ground <br />' • water extraction wells were purged and sampled on 28 August 2001 Field,work was performed m ' <br /> accordance with San Joaquin County Public Health Services-Environmental Health Division(PHS- <br /> EHD) and CVRWQCB guidelines for sampling ground water monitoring wells and investigating <br />' UST sites <br /> 2 ,1 MONITORING WELL PURGE PROCEDURES <br /> ' On 27 August 2001 a Solinst water level meter was used to measure the depth to ground water in <br /> I the twenty wells relative to the'tops of the well casings The ground water elevations and gradient R <br /> were determined from these data(Table 1) <br /> V J , <br /> I After recording water level,-measurements, each monitoring well was purged of standing water by <br /> utilizing a down-hole pump Approximately 6 to 60 gallons of water were removed from each of the <br /> wells (a iinnimurn of 3-casing--water volumes per well) For wells with`ground water above the <br /> screened interval, ground water was purged from near the top of the water column to remove water <br /> trapped within,the non-screened interval of the well casings Ground water temperature, pH and <br /> conductivity were measuied at regular purge-volume intervals using an 1CM or Hydac water <br /> Ianalyzer Field sheets and data are included in Appendix A Purged water was stored on-site in <br /> labeled, 55-gallon DOT-approved drums <br /> s <br /> Advanced GeoEnvironmental,Inc <br /> , J <br /> I j , <br />