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October 25, 1993 The Modesto - Riverbank Formation overlies Quaternary sand, silt and gravel of the Turlock Lake Formation(Wagner and Bortugno, 198 1) 2.2 Subsurface Conditions The soil exposed at the surface and the alluvium beneath the site consists mainly of yellowish-brown, brown, and reddish-brown sandy and clayey silts, interbedded with reddish- brown sands, over bluish-gray clayey silts The uppermost aquifer is located within the bluish- gray-colored silts 2.3 Surface Drainage The surface water nearest to the Site is the Mormon Slough, approximately 3,500 ft north of the Site (Figure 1) The nearest major surface water is the San Joaquin River and associated tributaries, located approximately 2 0 mi west of the site Surface water at the Site is directed into a series of surface drains which empty into a subsurface drainage system along the western boundary of the Site (Figure 2) This drainage system is inferred to flow in a southerly direction 2.4 Adjacent Property The Site is located in a residential/commercial neighborhood Lincoln Street forms the western boundary and French Camp Turnpike forms the southern boundary for the Site property An abandoned restaurant is located to the north and a residential property is located to the east Edison High School is located across French Camp Turnpike to the south- southeast 3.0 FIELD WORK This investigation included drilling three soil borings, installing two monitoring wells, collecting and analyzing selected soil and groundwater samples, and calculating the groundwater gradient The boring locations were selected by RFA based on discussions with San Joaquin County to evaluate the lateral extent of soil contamination and to measure contaminant concentrations short distances from the former underground diesel tanks and pump islands The locations of the soil borings and monttonng wells are shown on the Generalized Site Plan(Figure 2) RO G E R -3 - KO 1"j` 1 ASSOCIATE S