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at a depth of 84 feet bgs in the downgradientAirection. The existing water supply well l on site was also tested and no detectable-..levels of petroleum hydrocarbons were .: _ detected. The soil at the site is classified as Stockton clay (adobe) (USDA 1951). Stockton soil � I is formed from transported material of mixed origin and occupies nearly level or very gently sloping plains. Erosion is not a problem but because of the basin position, some areas are subject to flooding. Internal drainage is poor as a result'of the heavy-textured soil which becomes plastic and swells when wet; and movement of moisture is further retarded because the substratum is comparatively impervious. When the soil is dry it forms cracks. When the soil becomes wet the cracks close and the soil is then only slowly pervious to moisture (USDA 1951). i Groundwater at the site is encountered at approximately 84 feet bgs near the former t tanks, south of the truck scales and at approximately 84.5 feet bgs at the well located 65 feet in an easterly direction from the former tank area. Seasonal groundwater high is reported at 65 feet bgs. The.groundwater flow direction beneath the site is toward the east-southeast. 2.2 CLIMATE Thelevation e at the site is approximately 30 feet above sea level with an annual , c; precipitation average for the Stockton area at 11.69 inches of rain with the majority of the rain occurring from November through March (NOAA 1991). The average annual temperature is 62.1' F. The weather data are from the -Stockton Weather Station located at 37° 54' latitude and 121'0 15W' longitude at an elevation of 22 feet above sea level. �C 2.3 LAND USE/DEMOGRAPHICS The site is located east of Highway 99, a major interstate linking the northern and southern sections of the State of California. The site is situated at the southern portion of the town of Stockton. The San Francisco Bay area is located to the west, Sacramento to the north, and Manteca and Modesto to the south. The Stockton Metropolitan rr SALDOYELLO.RPT May 4,1995 2-2