ARCHIVED REPORTS_MONITORING WELL INSTALLATION REPORT - SITE ASSESSMENT WORK PLAN

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Monitoring Well Installation Report • RIVER CITY PETROLEUM-CONNELL MOTOR LIFT TRUCK 2211 North Wilson Way, Stockton, California ' 1.0. INTRODUCTION At the request of Ms. Kama Harrigfeld, Esq., for Connell Motor Lift Truck, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Monitoring Well Installation Report for the property located at 2211 North Wilson Way, Stockton, California (the site). Additionally, a work plan is included within the document to satisfy directives from the Central Valley Regional Water ' Quality Control Board(CVRWQCB).The site setting is illustrated on Figure 1. Site structures,soil borings and monitoring well locations are depicted on Figure 2. The scope of work included the installation and development of two ground water monitoring wells, performance of a limited ground water monitoring event and preparation of this report. The work was performed in accordance with procedures outlined the AGE prepared Monitoring Well ' Installation Work Plan dated 01 June 2004 and approved by the CVRWQCB letter dated 21 June 2004. A total of thirty-seven monitoring well have been installed at the stie. Seventeen wells are shallow- water wells screened at the water table(40-60 feet bsg);the remaining wells are either intermediate '• or deep monitoring wells.From a compilation and comparison of the site specific data a total of eight hydrogeologic units(HUs)were defined. Background information and a site conceptual model are included in Appendix A. 2.0. PROCEDURES ' Field work was performed in accordance with guidelines established by the CVRWQCB for subsurface investigation of contaminated sites. The well numbers of the monitoring wells were ' reassigned in a sequential order; the renumbered wells are presented on Figure 2. ' 2.1. MONITORING WELL INSTALLATION As required to assess the intermediate contamination at the former dispenser area, two additional ground water monitoring wells(MW-36 and MW-37)were installed in January 2005;the new wells were closely located with well MW-1 and MW-35 as shown on Figure 2. 2.1.1. Drilling and Sampling On 03 and 04 January 2005,the pilot boring for monitoring well MW-36 was advanced using a 50 • Km Sonic drill rig, equipped with 6.0-inch and 8.0-inch diameter drive drill stems; the 8.0-inch Advanced GeoEnvironmental,Inc.