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cw , <br /> 2. 6 Estimates of liquid quantity and composition leaked: <br /> :.._:...3 No estimate of liquid quantity can be made with existing <br /> information. The constituents detected in the soil sample ' <br /> are derived from diesel. <br /> 10 <br /> 2.7 Topography, geology, surface water, depth to groundwater: <br /> The site is situated on level terrain comprised of <br /> Quaternary-Recent alluvial sediments. The water table lies <br /> at approximately 15 feet below grade and flows to the north/ <br /> northwest based on San Joaquin Flood Control and <br /> Conservation District data. <br /> 2. 8 Proximity of private, municipal and irrigation wells: <br /> Data on wells within one mile of the project site has been <br /> requested from the Department of Water Resources (DWR) <br /> 2.9 Locations of nearby septic tanks and underground utilities: <br /> The facility is connected to the municipal sewer system and <br /> I' as such does not have septic tanks. No underground utilities <br /> are known in the vicinity of the underground tank. <br /> Utilities will be located by Underground Service Alert prior <br /> M to any subsurface investigation. <br /> 2.10 Distance to adjacent buildings and their water/sewer lines: <br /> The office/vehicle storage area is the nearest building to <br /> F;s:= the product line and tank area as indicated on Figure 2. <br /> 3.0 PROPOSED WORKPLAN <br /> To assess the potential contribution of the leaking <br /> underground tank at the Tracy facility to soil and <br /> groundwater contamination, WaterVIork proposes to drill and <br /> sample three groundwater monitoring wells. The three wells <br /> will include two down gradient anti one upgradient of the <br /> source to provide an initial determination of the <br /> contamination. <br /> The following scope of work is proposed: <br /> 1 . Three soil borings will be drilled to a depth of 15 feet <br /> below the water table tri provide for the installation of <br /> .0 groundwater monitoring wells . The wells will be <br /> permitted and constructed in accordance with San Joaquin <br /> County Environmental Health requirements. Drilling will <br /> be conducted by Osterberg and Stewart under C57 license <br /> 446670 using a hollow stem auger drill rig. The proposed <br /> well locations, presented on Figure 2, include one well <br /> upgradient of the tank nit/product lines, and two wells <br /> down groundwater gradient from the underground tank and <br /> 2 <br />