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' Quarterly Report - Third Quarter 2000 , r ' WEST CLAY PROPERTIES 639 West Clay Street, Stockton, California 1.0. INTRODUCTION At the request of Ms Tina Mayhew of West Clay Properties, 4dvdnced GeoEnvironmental, Inc I (AGE)has prepared this quarterly report for the property located at 639 West Clay Street, Stockton, California The site and the surrounding area are illustrated in Figure 1 Structures, well and boring locations are illustrated on Figure 2 This quarterly report has been prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites Background information is summarized in Quarterly Monitoring Report and Data Summary- December 1997 and Quarterly Report - October 1999, both prepared by AGE s 2.0 PROCEDURES Eight existingsle-cornPleted and two dual-completed ground water monitoring wells were purged , and sampled on 12 and 13 July 2000 Between 25 and 27 July 2000 three clustered monitoring wells Iand two ground water extraction wells were installed on the site The new wells were purged and sampled on 11 August 2000 Field work was performed in accordance with PHS-EHD and CVRWQCB guidelines for the investigation of UST sites and in accordance with the PHS-EHD approved Feasibility Pilot Tests Work Plan, dated 31 January 2000, prepared by AGE 21 MONITORING WELL PURGE PROCEDURES On 12 and 13 July 2000 a Solmst water level meter was used to measure the depth to ground water in twenty wells relative to the tops of the well casings The ground water'elevations and gradient were determined from these data (Table 1) ` After recording water level measurements, each monitoring well was purged of standing water by utilizing adown-hole pump Monitoring well MW-6B was purged dry after approximately-10 gallons of water were removed Approximately S to 23 gallons of water were removed from each of the remaining wells (a minimum of 3 casing-water volumes per well) For wells with ground water above the screened interval, ground water was purged from near the top of the water column to remove water 'trapped within the non-screened interval of the well casings ' Ground water temperature, pH and conductivity were measured at regular purge-volume intervals using an ICM or Hydac water analyzer Field sheets and data are included in Appendix A Purgedwater was stored on-site in labeled, 55-gallon DOT-approved drums f I Advanced GeoEuvironnieutal,Inc