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-- PROBLEM ASSESSMENT REPORT <br /> MANTECA BEAN FACILITY <br /> 229 MOFFAT BOULEVARD <br /> MANTECA, CALIFORNIA <br /> December 21, 1989 <br /> 1.0 INTRODUCTION <br /> i .. <br /> This report presents the results of a subsurface hydrocarbon <br /> investigation performed by Groundwater Technology, Inc. (GTI) at <br /> the Manteca Bean Facility, located at 229 Moffat Boulevard in <br /> Manteca, California (Figure 1) . This report is intended to <br /> fulfill requirements for a Problem Assessment Report (PAR) as <br /> r mandated by the California Regional Water Quality Control Board, <br /> Central Valley Region (the Board) , and the San Joaquin County <br /> Public Health Services, Environmental health Division (the <br /> County) . <br /> A leaking underground storage tank (removed in November <br /> 1986) introduced gasoline hydrocarbons into the subsurface. The <br /> purpose of the assessment was to investigate the concentration <br /> levels of hydrocarbons present, and to define the lateral and <br /> vertical extent of hydrocarbons in soil and groundwater. Data <br /> from a soil-vapor survey, a separate--phase petroleum hydrocarbon <br /> (SPP)-removal program, laboratory analyses of soil and ground- <br /> water samples, groundwater elevation measurements, aquifer tests, <br /> ^� <br /> GROUNDWATER <br /> TtwimoLorY,INC. <br />