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i <br /> Woodw.ard•Ciyde Consultants <br /> ..w <br /> 8820011STI CON <br /> ti. ENVIRONMENTAL ASSESSMENT REPORT <br /> FORMER CHEVRON USA STATION 6155 <br /> STOCKTON, CALIFORNIA <br /> ,.... 1.0 INTRODUCTION <br /> This report summarizes the results of Woodward-Clyde Consultants (WCC) <br /> environmental assessment of shallow soils and shallow groundwater at the <br /> former Chevron Service Station located along US Highway 99 north of Morada <br /> ' Lane in Stockton, California (Figure 1). The current report supersedes the <br /> report concerning the site by WCC dated September 2, 1988. <br /> =* 1.1 Object and Scope of Work <br /> The object of this investigation was to explore the shallow soils at the <br /> former Chevron-USA Service Station 6155 for petroleum products. To <br /> complete this task, four soil borings were drilled on the property at <br /> locations specified by Gettler-Ryan Inc. (Figure 2). While drilling, a WCC <br /> E s from each boring for chemical analysis and <br /> geologist collected soil sample <br /> ` prepared afield log describing the materials encountered using the Unified <br /> Soil Classification System, Chemical analyses of selected soil samples <br /> from the four borings were conducted by I.T. Corporation at their <br /> California Department of Health Services (DONS) certified environmental <br /> laboratory in San Jose, California. The samples were analyzed for benzene, <br /> toluene, and combined ethyl benzene and xylenes (BTEX), and low bailing <br /> Soil samples from Boring C-A, drilled <br /> point hydrocarbons (gasoline). <br /> adjacent to the former waste oil and fuel oil tanks, were also analyzed for <br /> high boiling point hydrocarbons and volatile haloearbons. In addition to <br /> the field activities, available information concerning the regional <br /> hydrogeologic setting was reviewed. The results of WCC`s background study, <br /> - - <br /> field investigation, and the I.T. Corporation chemical analyses--are <br /> - <br /> - - <br /> summarized below. <br /> 2 <br />