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Lot 24, Clarkadota Fig Plantation No 3, T 1N , R 7E , M D B & M , San Joaquin County, CA The Assessor's parcel No is 179-11-24 Refer to PLATE III for it's location in respect to other properties in the area REGIONAL GEOGRAPHIC SETTING: The site is situated in the southern part of the city of Stockton, a short distance west of Highway 99, and approximately 1200 feet south of Mariposa Road The area is zoned for manufacturing and industrial use, the nearest residences are about 700 feet to the southwest Refer to PLATES I& III for more information i GEOLOGIC & GEOMORPHIC PROVINCE: The property is situated in the southern part of the Sacramento Valley, which is the northern subprovince of what is referred to as the Great Valley of California The valley consists of to excess of 20,000 feet of sediments of Cretaceous and younger age generated by uplift and erosion of the Sierra Nevada Batholith to the east The topography is very flat, with surface drainage to the west at about 5'/rule Duck Creek is a short distance to the south, and Mormon Slough is about one mile to the north PLATE 11, a portion of a USGS topographic sheet, gives pertinent details of the area DEPTH TO GROUNDWATER: According to maps published by the San Joaquin County Flood Control District, groundwater was as high as 47'bgl in the Spring of 1986 Monitoring activities since April, 1992 have recorded an average water table depth of about 72' bgl In November, 1996, static water level averaged 67 72' bgl It was measured at an average depth of 67 03'bgl on September 5, 1997 PRIOR USE OF UST'S: Two, 5,000 gallon UST's which had been used for storing diesel fuel were removed from the property in March, 1957 There are no records concerning amounts of fuel used during the time the tanks were in service SUMMARY OF PRIOR EVENTS: March, 1987 - Two 5,000 gallon diesel UST's removed from site Some contamination measured to soil samples taken after tank removal March, 1988 - Site of removed UST's reentered Soil samples taken at 28' & 29' below grade Xylene & TVPH measured in both samples Excavation filled with clean soil 2