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Site Assessment Work Plan - July 1997 EF Mitchler- 400 South Lincoln Street Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr. Kent Gikas of the Union Safe Deposit Bank, Advanced GeoEnviroiunental, Inc. (AGE)has prepared the enclosed Site Assessment Work Plan for 400 South Lincoln Street in Stockton, California (the site). The scope of work is to assess whether the known hydrocarbon release from the Sierra Lumber site located directly south of the site at 375 Hazleton Street has impacted the soil and/or ground water on the site. e location of the site is illustrated in Figure 1 - Location iWap. A plan of the site is depicted in Figure 2 - Site Plan. This work plan is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD)and the Central Valley Regional Water Quality Control Board guidelines for the investigation of UST sites 2.0. BACKGROUND 2.1. SITE LOCATION The site is located in an industrial area of low topographic relief in Stockton, California near the intersection of Lincoln Street and Church Streets at an elevation of approximately 5 feet above sea level. The site is currently occupied by EF Mitchler, a cement mixing company. The surface of the site is covered with mostly asphalt or concrete. 2.2. UNDERGROUND STORAGE TANK REMOVAL It is our understanding that two 1,000-gallon gasoline USTs were removed from the site in August 1991. Petroleum hydrocarbons as gasoline (TPH-g) were not detected in soil samples collected from beneath the USTs. However, toluene was detected at a concentration of 0.009 parts per million. A site closure was granted by the PHS-EHD in a letter dated 18 May 1992. No other information readily was available from files on record with the PHS-EHD. 2.3. SURROUNDING PROPERTIES One site which has been identified as a potential environmental concern to the property is discussed