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Additional Monitoring Well Installation Work Plan • Former FISCO WAREHOUSE (Howard Lenz Property) ' 1648 Shaw Road, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Peter Lenz,Advanced GeoEnvironmental, Inc (AGE)has prepared this work ' plan for Installation of an additional ground water monitoring well at 1648 Shaw Road, Stockton, California This work plan was prepared as directed by the San Joaquin County Environmental ' Health Department (EHD), by letter dated 17 June 2002, to install a deep-screened ground water monitoring well to monitor the contaminants detected during the January 2002 investigation at a depth between 90 feet and 100 feet below surface grade (bsg), a copy of the letter is included as IAppendix A The location of the site is illustrated on Figure 1, a site plan is illustrated on Figure 2 This work plan is prepared in accordance with Central Valley Regional Water Quality Control Board I (CVRWQCB) guidelines for the investigation of underground storage tanks (UST) sites 20. BACKGROUND The site is located in a commercial area of low topographic relief in east Stockton, California, at an approximate elevation of 25 feet above mean sea level The site is bounded on the north and east by the Stockton Diverting Channel, on the west by State Highway 99 and on the south by Shaw Road Golden West Irrigation,an agricultural irrigation supply and distributing facility,presently occupies the property Background information and results of previous investigations at the site can be found in the AGE-prepared documents, Monitoring Well Installation Work Plan, dated 21 August 2000, Monitoring Well Installation and Quarterly Report-First Quarter 2001, dated 23 March 2001 and Cone Penetrometer Testing Report-January 2002,dated 17 April 2002 Soil and groundwater data from the previous investigations can be found in Tables 1 through 5 Cross-sections depicting the general lithology, hydrologic units and analytical results from deep ground water samples collected beneath the site are illustrated on Figures 3 through 6 The lateral and vertical extent of impacted soil and the lateral extent of impacted ground water has Ibeen defined The vertical extent of impacted ground water has not been fully defined ' 21 REGIONAL GEOLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, ' elongate, northwest trending, asymmetric structural trough The Great Valley Province has been • filled with thick sequences of sediment ranging in age from Jurassic to Recent,creating a nearly flat- lying alluvial plain,extending from the Tehachapi Mountains in the south to the Klamath Mountains IAdvanced GeoEnvi ron mental,Inc