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Site Assessment Work Plan - August 1997 <br /> Former STEELGARD PROPERTY <br /> 15700 McKinley Avenue, Lathrop, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with a request from Mr. Ken Sutherland of the Sutherland Company, Advanced <br /> GeoEnvironmental, Inc. (AGE) has prepared the enclosed Site Assessment Work Plan for 15700 <br /> McKinley Avenue in Lathrop, California(the site). <br /> The scope of work is to assess whether a hydrocarbon release from three-stage oil water separator <br /> (clarifier)has impacted the soil and/or ground water at the site. The location of the site is illustrated <br /> in Figure 1 -Location Map. A plan of the site is depicted in Figure 2 -Site Plan. <br /> This work plan is prepared in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division(PHS-EHD) and the Central Valley Regional Water Quality Control <br /> Board guidelines for the investigation of UST sites <br /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION <br /> The site is located in an industrial area of low topographic relief in eastern Lathrop, California near <br /> the intersection of McKinley Avenue and Ashley Lane at an elevation of approximately 20 feet <br /> above sea level. The surface of the site is mostly covered with asphalt or concrete. <br /> 2.2. UNDERGROUND OIL WATER SEPARATOR <br /> It is our understanding that a three stage, 1,000-gallon oil/water separator is presently installed at the <br /> site. The content or the separator has been removed and the separator was decommissioned to <br /> prevent soils or water to enter into the clarifier. Also the clarifier no longer discharges water to an <br /> lined evaporation pond at the site. <br /> 3.0. REGIONAL GROUND WATER DEPTH <br /> The estimated depth to ground water at this property is approximately 20 to 30 feet below surface <br /> grade(bsg), based on information from Lines of Equal Depth of Water Wells, Fall 1993 published <br /> by the San Joaquin County Flood Control District and Water Conservation District. The PHS-EHD <br /> uses the depth to ground water to calculate the potential impact to ground water from both surface <br /> and subsurface releases of hazardous substances. <br /> Advanced GeoEn%ironmental,Inc. <br />