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SEBASTIANI VINEYARDS/ <br /> WOODBRIDGE CELLARS <br /> SITE ASSESSMENT <br /> LODI, CALIFORNIA <br /> EXECUTIVE SUMMARY <br /> This site assessment report has been prepared as a result of fuel <br /> hydrocarbon contamination of soils and groundwater associated with a <br /> former underground fuel storage tank located at the Sebastiani Vineyards/ <br /> Woodbridge Cellars facility in Lodi, California <br /> Prior to McLaren Engineering involvement in this project, the tank was <br /> removed and fuel was observed directly beneath the former location of the <br /> tank A subsequent excavation of soils down to the groundwater table was <br /> monitored by McLaren Engineering and, based on the occurrence of petroleum <br /> hydrocarbons in soils and groundwater from the excavation pit, a <br /> comprehensive site assessment operation was initiated The site <br /> assessment included soil sampling, monitor well construction and <br /> groundwater sampling from five soil borings, two soil aeration areas, ten <br /> groundwater monitoring wells , and two site supply wells Results of the <br /> site assessment indicate that soil contamination extends laterally from <br /> the excavation pit between 15 and 35 feet Soil contamination begins at <br /> a depth of 7 to 12 feet below ground surface and extends to the shallow <br /> groundwater table at 18 feet below ground surface Contamination of the <br /> shallow groundwater unit at this site extends laterally from the <br /> excavation pit to the southwest a maximum of 100 feet Vertical <br /> contamination of groundwater is contained within the shallow groundwater <br /> unit which is underlain by a silty clay unit with a minimum thickness of <br /> 5 feet <br /> Site assessment findings indicate that remediation of soils and <br /> groundwater are required Specific elements of remediation and <br /> implementation of those elements will be presented in the McLaren <br /> Engineering, Final Remedial Plan <br /> INTRODUCTION <br /> This report presents results of McLaren Engineering's soil and groundwater <br /> investigation at the Sebastiani Vineyards/Woodbridge Cellars facility at <br /> 4614 West Turner Road in Lodi, California The location of the project <br /> site is shown in Figure 1 The investigation was conducted in accordance <br /> with the work plan submitted to Sebastiani Vineyards and the San Joaquin <br /> Local Health District (SJLHD) on April 12, 1989, and the April 20 and May <br /> 1, 1989, work plan addendums The work plan presented a program to <br /> characterize the extent of soil and groundwater contamination associated <br /> with a former underground fuel storage tank at the site In general the <br /> site assessment work included 1) completing soil borings and groundwater <br />. monitoring wells , 2) laboratory analysis of soil and groundwater samples, <br /> and 3) preparation of a site assessment report for submittal to regulatory <br /> agencies. <br /> 1 <br />