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2.6 Estimates of liquid quantity and composition leaked: <br /> No estimate of liquid quantity can be made with existing <br /> information. The constituents detected in soil samples are <br /> derived from diesel . <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. Base on field <br /> Inspection during tank removal, the groundwater at the site <br /> is know to be less than ten feet.t2ft22w Grade. The project <br /> site is bounded ore south and west sides by the San <br /> Joaquin River. Groundwater flow is expected to be towards <br /> the river. <br /> 2.8 Proximity of private, municipal and irrigation wells: <br /> Data on wells within one mile of the project site provided <br /> by the Department of Water Resources (DWR) are plotted on �n <br /> Figure 4 . <br /> 2.9 Locations of nearby septic tanks and underground utilities: <br /> The waste water treatment plant is part of the municipal . <br /> sewer system and as such does not have septic tanks. <br /> y� Underground utilities in the vicinity of the tank site are <br /> plotted on Figure 3. <br /> 3.0 PROPOSED WORKPLAN <br /> To assess the potential contribution of the leaked diesel <br /> product at the waste water treatment facility to groundwater <br /> contamination, Waterwork proposes to drill and sample four <br /> groundwater monitoring wells. One monitoring well adjacent <br /> to the leak point and three wells to define the areal <br /> m extent, two down gradient and one upgradient from the <br /> source, should be adequate to provide a preliminary <br /> determination of the groundwater and shallow soil <br /> contamination. <br /> The following scope of work is proposed: <br /> 1. Four soil borings will be drilled to a depth of 15 feet <br /> below the water tatle to provide for the installation of <br /> groundwater monitoring wells. Drilling will be conducted by <br /> Osterberg and Stewart under C57 license no. 446670, using a <br /> hollow stem auger drill rig. The proposed well locations, <br /> presented on Figure 2, include one well adjacent to the leak <br /> point, one well upgradient of the tank pit/product lines, <br /> and two wells down groundwater gradient from the underground <br />