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i UNOCAL Corporation March 9, 1994 Page 2 SITE DESCRIPTION The subject site is a vacant lot situated on the northwest corner of East Miner Avenue and California Street in the City of Stockton, California The site was most recently occupied by a UNOCAL Service Station, which consisted of a three-bay service station building, three product dispenser islands, and two gasoline and one waste oil tank in a common excavation (Plate 2) Local topography is flat-lying, at an elevation of approximately 15 feet above Mean Sea Level (MSL) McLeod Lake and the Stockton Deep Water Channel are approximately one-half mile to the west Subsurface Conditions Based on the work to date, the sods which underlie the site are predominantly clays to the total depth explored of approximately 31 5 feet below ground surface (bgs). A clayey sand stratum, two to three feet thick, was encountered at approximately 19 feet bgs Lateral continuity of this stratum could not be evaluated Groundwater was not encountered during the previous subsurface work at the site Based on work at other sites in the area, groundwater is expected to be at approximately 40 feet bgs Clayey gravel was encountered to a depth of approximately 14 feet bgs in Boring U-G. This material is imported fill placed in the former UST excavation Brick and the fragments encountered in Borings U-A and U-D and other man-made debris encountered during UST and product line removal indicate the uppermost ten to twelve feet of soil beneath the site is fill material PREVIOUS WORK One gasoline underground storage tank (UST) was removed from the southeast corner of the property (date unknown) Data regarding soils testing at the time of the tank removal are unavailable Two gasoline and one waste oil USTs and associated product piping were removed and the station building demolished during January, 1993 Petroleum 4V hydrocarbons were not detected in soil samples from beneath the USTs 782790-4 GeoStrategies Inc.