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HISTORICAL BACKGROUND-SITE CONCEPTUAL MODEL WATERLOO FOOD AND FUEL 3032 East Waterloo Road, Stockton, California BACKGROUND The site was occupied by a former gasoline station and a mini-mart. The mini-mart and service station are currently in operation with an up-graded UST system. Three gasoline USTs and one waste oil UST were removed from the site in January 1999. AGE has been informed that an abandoned UST estimated at 5,000-gallons was discovered and remains in place at the site. SITE DESCRIPTION The site is located on the southwest corner of Waterloo Road and Sutro Avenue, approximately 2,000 feet west of Highway 99. August Elementary School is located north of the site, with the surrounding area consisting of residential and commercial properties. A single structure occupies the southern portion of the site. SITE HYDROGEOLOGIC CONDITIONS The closest surface water feature to the site is the Stockton Diverting Canal, located approximately 1,000 feet northeast of the site. Generally, the groundwater elevation data collected from surrounding sites has documented a seasonal fluctuation of approximately five to ten feet. At the site groundwater has been monitored at depths ranging from 32 feet to 65 feet below surface grade (bsg). Based upon groundwater data collected from nearby subsurface investigations, the groundwater flow direction has been dominantly toward the south; however, the groundwater flow at the site has been inferred to be toward the southwest. In general, groundwater occurs within a light brown clayey silt. UNDERGROUND STORAGE TANK REMOVAL AGE has been informed that on 06 January 1999, Oil Equipment Service (OES) of San Andreas, California, removed four UST's identified as T-1 (5,000-gallon gasoline UST), 1-2 (10,000-gallon gasoline UST), T-3 (10,000-gallon gasoline UST), T-4 (500-gallon waste oil UST), fuel dispensers and associated product piping from the northeast portion of the site. During excavation, two previously unknown USTs, identified as USTs #5 and #6, were discovered. On 16 February 1999 USTs No. 5 and No. 6 were removed and soil samples were collected beneath each former UST position. On 22 February 1999, approximately 100 cubic yards of hydrocarbon-impacted soil was excavated and approximately 125 cubic yards of hydrocarbon-impacted stockpiled soil Advanced GeoEnvironmental, Inc.