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Phase II Additional Site Assessment Work Plan RISHWAIN PROPERTY 48 North Wilson Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. Joseph Rishwain esq.,Advanced GeoEnvironmental,Inc.(AGE)has prepared this Phase II Additional Site Assessment Work Plan for the property at 48 North Wilson Way, Stockton, California(site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This site was evaluated by the San Joaquin County Environmental Health Department (EHD) for closure in March 1993. A high lead concentration was detected in a pipeline soil sample during a 1989 tank removal, generating a notice of Hazardous Waste Discharge. The EHD issued a letter, dated 26 March 1993, stating that based on current standards, detection limits and site specific characteristics,it was impossible for the EHD to evaluate the site for closure.The letter further stated that although a UST unauthorized release report was not generated and the site was not considered contaminated, further investigation would be required for the EHD to issue a closure letter. During site investigation two borings to 25 feet were drilled on 27 May and 02 June 2003. Contaminates were encountered at 14 and 24 feet in both borings. As a result of these findings the Environmental Health Department required further site assessment in order to attain site closure. This work plan was prepared to satisfy the conditions for site closure, and is in accordance with Appendix,4 to Tri-Regional Recommendations-Reporting, dated 30 August 1991,prepared by the , Central Valley Regional Water Quality Control Board for the investigation of underground storage tank(UST) sites. 2.0. BACKGROUND The site is a vacant property at the southeast corner of North Wilson Way and Weber Avenue,in an area of mixed commercial and light industrial use(Figure 2).Features on the property include areas of grass,a narrow asphalt driveway,and concrete foundations from former structures.The Southern Pacific Railroad right-of-way was adjacent to the subject property along the north boundary. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough; the northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, Advanced GeoEnvironmental,Inc.