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Quarterly Report - April 1999 <br /> THREE B S TRUCK PLAZA <br /> 14749 Thornton Road, Lodi, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for well installation <br /> and ground water monitoring and sampling activities at 14749 Thornton Road (site), Stockton, <br /> California The location of the site is illustrated in Figure 1, general features at the site are illustrated <br /> in Figure 2 <br /> The scope of work of this investigation included installation of six ground water monitoring wells <br /> with the objective of assessing and monitoring subsurface impact of petroleum hydrocarbons This <br /> report is prepared in accordance with guidelines established by the San Joaquin County Public <br /> Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional <br /> Water Quality Control Board for investigation of underground storage tank (UST) sites A summary <br /> of previous investigations at the site was included in Preliminary Site Investigation and Evaluation <br /> Report, dated 05 November 1997 and prepared by AGE <br /> 2.0. PROCEDURES <br /> In March 1999,monitoring wells MW-1 through MW-6 were installed on-site, in April 1999, ground <br /> water monitoring and sampling was performed at each newly installed well location Ground water <br /> monitoring procedures for the site were outlined in Monitoring Well Installation Work Plan, dated <br /> 22 February 1999, prepared by AGE, and approved by the PHS-EHD by letter on 05 March 1998 <br /> 2 1 INSTALLATION OF GROUND WATER MONITORING WELLS <br /> On 29 and 30 March 1999, six soil borings/monitoring wells(MW-1 through MW-6)were advanced <br /> on-site as part of site assessment activities related to the former USTs at the site Soil borings MW-2, <br />' MW-4 and MW-5 were advanced vertically to depths of 25 feet below surface grade (bsg), MW-3 <br /> and MW-6 were advanced vertically to depths of 30 feet bsg, MW-1 was advanced vertically to a <br /> depth of 35 feet bsg Soil borings MW-1 through MW-6 were advanced utilizing a B-53, truck- <br /> mounted drill rig equipped with 8-inch diameter hollow-stem augers Soil cuttings were stockpiled <br /> on and covered by plastic sheeting at the site in an area lacking public access The soil <br /> boring/monitoring well locations are depicted in Figure 2 <br /> 2 1 1 Soil Sample Collection <br /> Discrete soil samples were collected at 5-foot intervals beginning at 5 feet bsg from soil borings <br /> Advanced GeoEmtronmentai, Inc <br /> I <br />