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Phase II Site Assessment Work Plan De Anda Property 2606 East Main Street Stockton, California 1.0. INTRODUCTION At the request of Mr. Francisco De Anda,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Phase II Site Assessment Work Plan for the property at 2606 East Main Street, APN 155-451-11,in Stockton,California. The location of the site is illustrated on Figure 1.A plan of the site is illustrated on Figure 2. This workplan is prepared as required by the San Joaquin County Environmental Health Department (EHD) for the procurement of a soil boring permit. The work is being performed as part of due diligence by Mr. Francisco De Anda to investigate the areas of the former dispenser islands and underground storage tanks (USTs). 2.0. BACKGROUND The subject property is located in the southeastern portion of the City of Stockton, San Joaquin County, on the southeast corner of East Main Street and Sullivan Avenue. Land use of the surrounding properties was mixed residential and commercial. Figure 1 shows the setting of the subject property,which is located in the northwest quarter of Section 07,Township 1 North,Range 7 East, Mount Diablo Base and Meridian (7.5 Minute United States Geological Survey (USGS) Topographic Series, Stockton East, California, 1968, photo revised 1987) at an elevation of approximately 25 feet above mean sea level and in an area of very low topographic relief. The regional slope of the area is relatively gentle and dips toward the west-northwest. 2.1. UNDERGROUND STORAGE TANK REMOVAL The subject property was a Sunland Service Station in 1956 with a 42-foot by 25-foot service station building, three pump islands with two pumps each, two "hoists", a dual hose lube reel and three USTs(one 12,000-gallon,one 8,000-gallon and one 550-gallon).The service station was demolished in January 1984;the subject property was undeveloped in June 2000.Records did not show the exact location of the USTs, or whether they were removed or closed in-place. The EHD had no records on-file for the property address. 2.2. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The subject 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 Advanced GeoEnvironmental,Inc.