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r <br /> 05 November 1997 <br /> AGE-NC Project No 96-0249 <br /> rPage 2 of 7 <br /> r Based on General Soil Map (1992, United States Department of Agricultuie Soil Conservation <br /> Service) obtained from the San Joaquin County Soil Survey, the site area is shown as being within <br /> the Guard-Devries-Rsblancho (GDR) soil association The GDR soils are located within basin rims <br /> r along the eastern edge of the Sacramento-San Joaquin Delta area, and generally consist of poorly <br /> drained, fine to coarse textured soils The GDR soils generally formed in alluvium derived from mixed <br /> rock sources <br /> r <br /> 2 3 GROUND WATER DEPTH AND GRADIENT <br /> According to the map titled Lines Of Equal Depth To Groundwater- Spring 1996, published by the <br /> San Joaquin County Flood Control and Water Conservation District, the estimated depth to ground <br /> water at the property is between 10 and 15 feet below surface grade (bsg) Based on ground water <br /> monitoring data collected approximately 100 feet west of the site, prevailing ground water flow <br /> direction near the site area is generally toward the south, although flow directions may vary locally <br /> and seasonably <br /> 3 0. PROCEDURES <br /> 3 1 SCOPE OF WORK <br /> The scope of work for this preliminary site assessment included advancement of four soil probe <br /> borings, coIIection of soil and ground water samples for analysis and description, and preparation of <br /> a preliminary assessment report <br /> 32 SOIL. PROBE BORINGS <br /> On 23 September 1997, four soil probe borings (P1 through P4) were advanced to depths of <br /> approximately 25 feet bsg at the site Advancement of soil probe borings was accomplished utilizing <br /> a van-mounted Geoprobe 5400 equipped with 1 125-inch diameter probe rods with an attached 2 15- <br /> inch diameter soil sampler, using "direct push" technology Probe borings PI through P3 were <br /> advanced near the UST area, probe boring P-4 was advanced near a dispenser island area located on <br /> a west section of the site Soil probe boring locations are depicted on Figure 2 <br /> 3 3 SOIL SAMPLE COLLECTION <br /> Discrete soil samples were continuously cored from P 1 through P4 utilizing a Geoprobe Macro-core <br /> Advanced GeoEnviromnentai,Inc <br />