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{ <br />' Quarterly Report - Fourth Quarter 2002 <br /> • w <br /> WEST CLAY PROPERTIES <br />' 639 West'Clay Street, Stockton, California <br />' 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 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 for investigation of underground storage tank(UST) sites <br /> Background information is summarized in Quarterly Monitoring Report and Data Summary - <br /> December 1997 and Quarterly Report- October 1999, both prepared by AGE <br /> 2.0. PROCEDURES <br />' On 12 and 13 November 2002, four monitoring wells were installed near the UST cluster area <br /> (Figure 2) On 26 December 2002,eighteen single-completed and two dual-completed ground water <br /> lie monitoring wells and two ground water extraction wells were purged and sampled <br /> Field work was performed in accordance with San Joaquin County Environmental Health <br /> 1 Department (EHD) and CVRWQCB guidelines for sampling ground water monitoring wells and <br /> investigating UST sites <br /> 21 MONITORING WELL INSTALLATION <br />' On 12 and 13 November 2002, four soil borings were advanced at the site to install two monitoring <br /> well clusters, MW-14A/B and MW-15A/B The wells were developed on 26 December 2002 <br />- - 2 1 1 Drilling and Soil Sampling <br />' The soil borings were advanced using a CME-75 high torque drill rig equipped with S 25-inch <br /> diameter hollow-stem augers The drill rig and three-man crew were supplied by Mitchell Drilling <br /> Environmental of Rancho Cordova Auger returns generated by drilling were stockpiled on-site <br /> pending disposal <br /> Soil samples from borings MW-14B and MW-15B were collected at 5 foot intervals, from 5 feet to <br /> 70 feet bsg,utilizing a California modified split-spoon sampler loaded with three pre-cleaned 2-inch <br /> Advanced GeoEnvzronmcntal,Inc <br />