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c ^ <br /> i <br /> r' <br /> Quarterly Report - Fourth Quarter 2001 <br /> WEST CLAY PROPERTIES „ <br /> 639 West Clay Street, Stockton, California ' <br />' 1.0. INTRODUCTION <br /> > W <br />' At the request of Ms Tina Mayhew of West Clay Prope'ties, 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 <br />' locations axe illustrated on Figure 2 1 <br /> This quarterly report has been prepared In accordance with Central Valley Regional Water Quality <br /> Control Board(CVRWQCB) guidelines for investigation of underground storage tank(UST) sites <br /> Background information is sununanzed in Quarterly Monitoring Report and Data Summary - <br /> December 1997 and Quarterly Report- October 1999, both prepared by AGE <br /> ! 5 1 <br /> 2.0. PROCEDURES <br /> Fourteen single-completed and two dual-completed ground water monitoring wells and two ground <br /> iwater extraction wells were purged and sampled on 28 November 2001 Fieldwork was performed <br />' in accordance with San Joaquin County.Pubinc Health Services - Enwonmental Health Division <br /> (PHS-EHD) and CVRWQCB gundelmes for sampling ground water monitoring wells and <br />' investigating UST sites <br />' 2 1 , MONITORING WELL PURGE PROCEDURES <br /> On 27 November 2001 a Solmst water level meter was used to measure the depth to ground water <br /> in the twenty wells relative to the tops of the well casings The ground water elevations and gradient <br />' were 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 or a dedicated disposable plastic bailer Between 4 4 and 59 gallons of <br /> water were removed from each of the wells (a minimum of 3 casing-water volumes per well) For <br />' wells with ground water above the screened interval, ground water was purged from near the top of <br /> the water column to-remove water trapped wnthin'the non-screened interval of the well casings <br /> Ground water temperature, pH and conductivity were measured at regular purge-volume intervals <br />' using an ICM or Oakton water analyzer Field sheets and data are included in Appendix A Purged <br /> water was stored on-site in labeled, 55-gallon DOT-approved drums <br /> 1 <br /> Advanced GeoEnviromnent4 Inc <br /> 5 <br />