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1.0 BACKGROUND INFORMATION i 1.1 Site Description / History The site is located at the intersection of 1600 West Durham Ferry Road and 31510 Highway 33 in Tracy, California (Figure 1) The property is owned by George Teramshi, who operates a commercial automotive maintenance and service facility on the property There are currently no underground fuel tanks on the property The site consists of a mini market store, maintenance/service building and a outside parking area around the facility The lot is located on approximately 5 acres of land (Figure 2) The site is level and at an elevation of about 80 feet above sea level It is covered by concrete or asphalt immediately surrounding the main building with a gravel & soil perimeter The surface water for the site is channeled towards the highway to the west of the site No engineered subsurface storm water drainage system exists at this site 1.2 Geology and Hydrogeology No detailed geological or hydrogeological assessments have been pertormed at this site Depth to water at the property is anticipated to be approximately 10 feet to 15 feet below the ground surface Characteristics of the aquifers and occurrence of groundwater at the site is anticipated to be typical of this area and for the San Joaquin Valley groundwater basin Groundwater gradient for the area is presumably in the northeasterly direction, but on occasions may deflect to south and Southeast based on agricultural demands in the immediate area The storm water drainage along Highway 33 is also suspected of influencing these variations 1.3 Previous Work On January 24, 1990, two steel 1,000 gallon underground storage tanks were removed flom the northern edge of the mini market building The southern tank #1 was leaded gasoline and the northern #2 was unleaded gasoline Upon removing the tanks the San Joaquin inspection report indicates that corrosion was present on the tanks and a petroleum odor was noticeable The subsequent laboratory soils analysis of the tank pit area indicates that a release of a petroleum hydrocarbon product(primarily gasoline) has occurred A limited over excavation was conducted in the general area of the tank field The lower limit of the excavation ceased at approximately 11 vertical feet when water was observed flowing into the floor of the pit No water samples were collected The excavated soil was contained and stockpiled at the southern end of the site The excavation was then filled with clean backfill The contaminated stockpiled soil has subsequently been aerated and treated on site On April 05, 1990, two other underground storage tanks were removed from the site These two tanks contained kerosene and waste oil, respectively The steel 450 gallon waste oil tank#3 was located to the south east of the shop / maintenance building and the steel 360 gallon kerosene oil tank #4 was located on the eastern side of the shop and dust within the buildings foundation (see attached site map for tank locations) i 1