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1 ' ^ + V s 4^ _ � Y � a R _ � '� - ' .. ♦ ; r , 5 ,f H a _r r h 3 —J , � ~—� <br /> S ry Zy <br /> r <br /> , <br /> Quarterly Report - Fourth Quarter 2000 r M <br /> WEST CLAY PROPERTIES _ <br /> 639 West Clay Street, Stockton, California <br /> I t t - <br /> I' 1.0. 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 bonng <br />' locations are illustrated on Figure 2, <br /> This quarterly report has been prepared in accordance with Central Valley Regional Water Quality a <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 /> , <br /> I <br /> I <br /> , ' r <br /> 2.0. PROCEDURES <br /> I I <br /> Fourteen single-completed and two dual-completed ground water monitoring wells and two ground <br />' water extraction welts were purged and sampled on 18 December 2000 Field work was performed <br /> in accordance with San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS-EHD) and CVRWQCB guidelines for sampling ground water monitoring wells and the <br /> investigation of UST sites <br /> k <br /> + t <br />' 2 1 , MONITORING WELL,PURGE PROCEDURES <br /> r I <br /> On 18'December 2000 a Sohmst water level meter was used to measure the depth to ground water <br /> in 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 standmg water by r <br />' utilizing a down-hole,pump Monitoring well MW-6B and MW-11 B- were purged dry after' , ; <br /> - -y x s - - rT -- - r�--� <br /> approximately 13 and77 gallons of water were removed,respectively Approximately 6 to 65 gallons <br />' of water were removed from each of the remaining wells (a minimum of 3 casing-water volumes per + , <br /> well) For wells with ground water above the screened interval, ground water was purged from near, <br /> the top of,the water column to, remove water trapped within the non-screened interval of the well <br />' casings Ground water temperature, pH and conductivity were measured at regular purge-volume <br /> intervals using an ICM or Hydac water analyzer Field sheets aid data are included in Appendix A <br /> Purged water was stored on-site in labeled, 55-gallon DOT-approved drums <br /> , <br /> Advanced GeoEnvironmentai,Inc <br /> r <br /> t k <br />