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y <br /> 1 . INTRODUCTION <br /> 1 . 1 SCOPE <br /> EA Engineering, Science, and Technology, Inc. , (EA) was retained <br /> by Chevron U.S.A. Inc. to investigate the presence, levels, and <br /> horizontal extent of hydrocarbons under the site of former <br /> Chevron Service Station (SS) 9-7780, located at 3642 E. Fremont. <br /> Street in Stockton, California. <br /> i <br /> 1 .2 SITE SETTING <br /> The investigated site is located in the eastern part of the city <br /> of Stockton, at the intersection of E. Fremont Street and Windsor <br /> Avenue, about 1 ,000 feet west of Highway 99 (Figure 1 ) , in an <br /> area of mixed residential/commercial and industrial character. <br /> The facility has been closed and the buildings and all installa- <br /> tions have been removed. The site surface is covered by unim- <br /> proved fill and is slightly ( 1-2 feet ) elevated above the sur- <br /> rounding area. <br /> The site is in fla terrain approximately 25 feet above mean sea <br /> level, near the northern end of the San Joaquin Valley. The <br /> topography, typical of the flood plain of the San Joaquin Valley, <br /> is flat, sloping gently to the west toward San Joaquin River. <br /> The nearest surface waters are the Stockton Diversion Canal, <br /> about three--quarters of a mile northeast, and the intermittent <br /> Mormon Slough, about 1 . 5 miles south of the site. <br /> 1 .3 HYDROGEOLOGY AND WATER USE <br /> The Stockton area is underlain by unconsolidated Quaternary <br /> deposits of the Victor Formation and the Laguna Formation, which <br /> includes the Arroyo Seco gravel, and by related continental <br /> deposits. The Laguna Formation may be partly of late Pliocene <br /> age• Beneath these deposits lie consolidated and semi- <br /> c23/72a2 <br />