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1 <br /> 1 <br />' Sutter Office Center Project 2267-E <br /> July 10, 2000 Page 3 <br /> filled with sand. We are not aware of any reported petroleum contamination of the soil or <br /> groundwater at this site, which is currently asphalt-paved and being used as a parking lot <br /> for the office building at 242 N. Sutter Avenue. <br />' A Unocal Service Station {Site No. 1181, File No. P98-188} located on the northwest <br /> corner of East Miner Avenue and California Street, continuously occupied this parcel at <br />' 437 East Miner Avenue, approximately 100 feet north of the subject property, from 1922 <br /> until its closure in 1992 This service station was remodeled in 1967, and two leaking, 45 <br /> year old, 1,000 gallon gasoline tanks and a 550 gallon waste oil tank were removed from <br /> the southwest corner of the site These tanks were replaced by two new 10,000 gallon <br /> tanks and a 280 gallon waste oil tank which were relocated in the western portion of the <br /> site; see Plate 1 Soil samples from under the removed tanks were not tested for <br /> petroleum hydrocarbon contamination at the time of their removal <br />' Subsequent field studies and monitoring wells, installed in 1994, showed that there is <br /> contamination beneath the underground storage tanks that were removed in 1967, with <br /> total petroleum hydrocarbon concentrations up to 19,000 ppm TPH-gas and 140 ppm of <br />' benzene to a depth of 45 feet below the ground surface. Studies in this area indicate that <br /> the hydrocarbon concentrations in the soil and groundwater are limited to the area around <br />' the location of the leaking underground storage tanks which were removed from the <br /> southeast corner of the site in 1967. A summary of the groundwater monitoring well <br /> analysis for the Unocal Service Station is shown in Appendix A <br /> 1 <br /> HYDROGEOLOGIC SETTING <br />' The subject property is located ona <br /> relatively level parcel, in an urbanized area, at an <br /> elevation of approximately 16 feet above mean sea level. Surface water drains to the <br /> west, toward San Francisco Bay, within a culvert south of the subject property <br /> • <br /> I <br />' HYDRO-GEO CONSULTANTS,INC <br />