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USA65 Pilot Test-Workplan <br /> o Seven additional monitor wells were installed by Applied <br /> Geo-Systems during this investigation, culminating in the <br /> Problem Assessment Report dated December S, 1989 . This PAR <br /> presented Soil Boring analysis, Ground water analysis, <br /> Ground water flow direction, Aquifer 'bail down' test data <br /> with an estimate of transmissivity and hydraulic <br /> conductivity, and an evaluation of the zero lane of <br /> contamination. <br /> o Western Geo-Engineers has been contracted to conduct <br /> Quarterly Ground water monitoring since February, 1991 . <br /> o Regulatory concerns expressed in San Joaquin County PHS/EHD <br /> letter on September 30, 1992 indicated a need for an <br /> additional ground water monitoring point in the area of <br /> monitoring wells S1 and S2 , which are now dry. Western Geo- <br /> Engineers installed MW8 10 feet downgradient of the <br /> Underground Storage Tank field in February, 1993 (see, <br /> Figure 3) . <br /> o The deposits under the site are Recent to Pleistocene age <br /> alluvium and consist of lenticular silt, sand, gravel and <br /> clay representing a heterogeneous fluvial environment . The <br /> problem assessment report for this site (Dec . 5, 1989) <br /> details the local and regional geology. The soil samples <br /> and drill cuttings from the recently installed MW8 indicated <br /> ` similar lithologies to those presented in the PAR. <br /> USA Gasoline Corporation has installed 10 monitor wells in the <br /> course of the investigation of this site . Six of these wells are <br /> located within the USA property boundaries and four well are <br /> located to the south in a downgradient direction (see Figure 3) . <br /> The need for a pilot test at this site is based upon information <br /> and data listed above. It will allow the evaluation <br /> (feasibility) of a vapor extraction system, to remove any fuel <br /> contaminants at this site if necessary. <br /> WORKPLAN <br /> DESIGN <br /> The system will be designed to economically facilitate the <br /> gathering of required information and data discussed below. When <br /> the design is considered it must be adjustable in terms of flow <br /> rates, vacuum,, pressure, source etc. , so that optimum conditions <br /> may be built into a final system if necessary. These variable <br /> and non-variable conditions must be monitorable and measurable . <br /> 2 <br />