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t <br /> h , rrr <br /> f=;..4:.a.4't-r.. - n z: - ,.^s r r..n— • c _ __ x`_ yc«s ..-,.^" ,. s su t I_ <br /> N <br /> r 4 <br /> M r ' Y ' e ` , ' ' ' I � M • V r l <br /> �F Quarterly Report .- First Quarter 2001 <br /> WEST CLAY PROPERTIES <br /> 4 639 West Clay Street, Stockton, California <br /> i r <br /> ' 1.0. INTRODUCTION k <br /> At the requestofMs`Tina Mayhew of West Clay Properties, Advanced GeoEnvironmeiital,` Inc s <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 baring <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) t <br /> sites Background information is summarized in Quarterly Mom ton ng Report and Data Summary; <br /> r December 1997 and Quarterly Report - October 1999, both prepared by AGE µ <br /> J <br /> 1 <br /> 2.0. PROCEDURES <br /> e <br /> Fourteen single-completed and two dual-completed ground water monitoring wells and two ground <br />' water extraction wells were purged and sampled on 13 March 2001 Field work was performed in <br /> accordance with San Joaquin County Public Health Services--Environmental.HealthDivision(PHS- <br /> EHD) and CVRWQCB guidelines for sampling ground water monitoring wells and investigating <br /> UST sites ` <br />' 2 1 MONITORING WELL PURGE PROCEDURES w ` <br /> On 13 March 2001 a Solinst water level meter was used to measure the depth to ground water in the <br />' twenty wells relative to the tops of the well casings The groundwater elevations and gradient were r <br /> determined from these data(Table 1)` <br /> r <br /> After recording water level measurements, each monitoring well was purged of standing water by <br /> utilizing a down-hole pump Approximately 6 to 66 gallons of water were removed from each of the <br /> remaining wells (a minimum of 3 casing-water volumes per well) For wells-with-ground water= <br />'` above the screened interval, ground water was purged from near the top of the water column to <br /> remove water trapped ,within the non-screened interval of the well casings , Groundwater <br /> temperature,pH and conductivity were measured at regular purge-volume intervals using an Oakton <br />' or Hydac water analyzer Field sheets and data are included in Appendix A Purged water was stored- <br /> on-site in labeled, 55-gallon DOT-approved drums <br /> _ <br /> Advanced GeoEnvirenmental,Inc <br />