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k <br /> r <br /> �✓� r <br /> Ii uarterl Report - Second Quarter 2001 Q Y, p } <br /> WEST CLAY PROPERTIES <br />' 639 West Clay Street, Stockton, California <br /> I1.0 INTRODUCTION , <br /> ' At the request of Ms Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental, Inc a <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 ' <br /> locations are illustrated on Figure 2 <br /> I <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 /> December 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 13 March 2001 Field work was performed in <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 /> I � r <br /> 21 PURGE WATER WASTE DISPOSAL <br /> On 09 May 2001, approximately 935 gallons of non-hazardous purge water were pumped from <br /> on-site 55-gallon drums' The purge water had been generated during previous ground water <br />' monitoring events Pumping and disposal was completed by American Valley Waste Oil, Inc of ' <br /> Delhi, California All waste was disposed at Seaport Environmental located in Redwood City, <br /> California A copy of the waste disposal manifest is included in Appendix A <br /> r <br /> 1 <br />' 2 2 MONITORING WELL PURGE PROCEDURES <br /> On 30 May 2001 a Sohnst water level meter was used to measure the depth to groundwater in the <br /> twenty wells relative to the tops of the well casings The ground water elevations'and gradient were <br /> I determined from these data(Table 1) <br />' After recording water level measurements, each monitoring well was purged of standing water by <br /> utilizing a down-hole pump Approximately 6 to 62 5 gallons of water were removed from each of <br /> the wells (a minimum of 3 casing-water volumes per well) For wells with ground water above the <br /> 1 Advanced GeoEnvironmental,Inc <br /> r ' <br /> 1 <br /> 1 r r 4 <br /> I4 <br /> 1 <br />