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Groundwater at the site occurs at approximately 25-35 feet <br /> below grade and flows to the west-northwest ( SJFC&WCD, <br /> 1989 ) . A well is located on the adjacent property to the <br /> east which supplies both of the buildings on the parcel. No <br /> information could be obtained regarding the construction of <br /> this well. No water quality problems have been reported in <br /> the groundwater in the area according to both Department of <br /> Health Services and Regional Water Quality Control Board <br /> records. <br /> Any precipitation or surface water at the site would be <br /> expected to infiltrate because of the gravel surface and the <br /> underlying porous sandy soils. Surface runoff from the site <br /> is generally to the south. <br /> 4.0 PROPOSED WORKPLAN <br /> To assess the potential contribution of the former leach <br /> field to soil and groundwater contamination, WaterWork <br /> proposes to drill and sample one groundwater monitoring <br /> well . The well will be downgradient of the potential source <br /> to provide an initial determination of the contamination. <br /> The gradient in the area is based on work performed at the <br /> nearby Nestle property on Industrial Road ( less than 1/4 <br /> mile) . <br /> The following scope of work is proposed: <br /> 1 . One soil boring will be drilled to a depth of 15 feet <br /> below the water table to provide for the installation of <br /> a groundwater monitoring well . The well will be <br /> permitted and constructed in accordance with San Joaquin <br /> County Environmental Health requirements. Drilling will <br /> be conducted by Sierra Drilling under C57 license 446670 <br /> using a hollow stem auger drill rig. The proposed well <br /> location, presented on Figure 2, will be downgradient of <br /> the former leach field. <br /> 2. Drill cuttings will be logged continuously for <br /> characterization of contamination and soil type by the <br /> Unified Soil Classification System. Descriptions of <br /> soils encountered and monitoring well construction <br /> details will be recorded on a boring/well log and <br /> included within the assessment report ( Figure 3 ) . Drive <br /> soil samples will be collected above the water table at <br /> five foot intervals beginning at five feet and below the <br /> water table at select intervals for determination of <br /> soil type. One sample from the boring will be selected <br /> for analysis . Soil sampling will be conducted in <br /> accordance with WaterWork ' s soil sampling protocol <br /> (Appendix II ) . Laboratory analysis of soil samples will <br /> be conducted for chlorinated and aromatic hydrocarbons, <br /> and oil and grease by EPA methods 8010/8020 and 418. 1, <br /> 3 <br />