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t, 1 1 J s 1 " Quarterly Report - Second Quarter 2005' r r WEST CLAY PROPERTIES , 639-West Clay Street, Stockton, California o f i e ' r •. I t r l � 1.0. INTRODUCTION ' At the request'of Ms _Tina Mayhew of West Clay Properties, Advanced GeoEnvironmental, Inc , M (AGE)has prepared this quarterly report for the property located at 639 West Clay Street, Stockton, 5 California The site and the surrounding area are Illustrated on Figure 1 Structures,well and boring locations are illustrated 6n Figure 2 r " At the present time,there are twenty-two ground water monitoring wells at the site(Table 1),eleven " f are shallow wells screened, between 10 feet and 35 feet below surface grade (bsg), nine are ' intermediate wells screened between 30 feet and 50 feet bsg or 40 and 60 feet bsg,and two are deep ' wells screened between 65 feet and 70 feet bsg Additional site background Information is presented ' in Appendix A { IJ j This quarterly report has been prepared in accordance with Central,Valley Regional Water Quality, Control Board(CVRWQCB) guidelines for investigation of underground storage tank(UST)sites " hi • ' S 1 5 f ' ' ' , 1 i n 2.0. PROCEDURES On 03 June 2005,the twenty-two ground water monitoring wells were measured for depth to water and four of the monitoring wells were purged and sampled The field work was performed in accordance with San Joaquin County Environmental Health Department (EHD) guidelines for sampling ground water monitoring wells and CVRWQCB guidelines for investigation of UST sites f ' , 2`1 WELL MONITORING AND EVACUATION s A Solinst water,level meter was used to measure the depth to ground water in twenty-two wells relative to the tops of the well casings The ground water elevations and gradient were determined from these measurements (Table 1) ` j After recording water level niedsurements, wells MW-1, MW-2, MW-9 and MW-10 were purged of standing water utilizing a Waterra inertial pump or a dedicated disposable plastic bailer, between , 6 and 19 5 gallons of water were removed from each of the wells Ground water temperature,pH and ,> ` conductivity were measured at regularpurge-volume intervals using an Oakton water analyzer Field sheets and data are included in Appendix B Purged water was stored on-site in labeled, 55-gallon Department of Transportation (DOT)-approved drums , 1' r � , , f Advanced GeoEnvironmental,Inc 1 1, 1' I ,