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� la <br /> J ; <br /> of t ' <br /> Quarterly Report - Third and Fourth Quarters 2003 <br /> WEST CLAY PROPERTIES <br /> ! 639 West Clay Street, Stockton, California <br /> I <br /> ` aE <br /> 1.0. INTRODUCTION <br /> At the request of,Ms Tina Mayhew of West Clay Properties, Advanced GeoEnvironrnental, 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 are Illustrated on Figure 2 <br /> This quarterly report has been prepared in accordance with Central Valley Regional Water Quality <br /> Control Board(CVRWQCB)guidelines far investigation of underground storage tank(UST) sites <br /> Complete background information Is presented In Appendix A <br />' 2.0. PROCEDURES # { <br /> , <br /> 1 On 12 September and 12 November'2003, eighteen single-completed and two dual-completed �!! <br /> ground water monitoring wells and two ground water extraction wells were purged and sampled" ` <br /> E <br /> during separate events Field work was performed in accordance with San Joaquin County <br /> • Environmental Health Department (EHD) and CVRWQCB guidelines for sampling ground water <br /> monitoring wells and investigatingiUST sites <br />' 2 1 QUARTERLY GROUND WATER MONITORING <br /> Eighteen single-completed and two dual-completed ground water,monitonng wells and two ground 1 <br /> water extraction wells were purged and sampled on 1,2 September grid 12 November 2003 Ten of <br /> ! the wells(MW-4,MW'1-5,MW-6A,MW-7,MW-8A,MW-10,MW-11A,MW-12A,MW-13A, 14A, <br />' 15A and EW-1)were shallow wells screened from approximately 10 to 35 feet below surface grade <br /> 1 (bsg) Eight wells(MW-1,MW-2,MW-6B,MW-8B,MW-9,MW-11LB,MW-12B,MW-13B,MW- <br /> 14B and MW-15B)were deep wells screened from approximately 40 to 70 feet Two wells(MW=3 <br />' and EW-2) were intermediate wells,screened between 30 and 50 feet " <br /> 2 12 Well Monitoring and Evacuation <br /> I' � E �4 ri 'During each event, a Solinst'water le] vel meter was used toE measure the depth to ground water In the, <br /> 24 wells relativetothe tops of the well casings The ground water elevations and gradient were I <br /> determined from these data (Table 1) t h I <br /> 11 4 <br /> Advanced GeoEnvironmental,Inc <br />