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*** fineon Associates <br /> 1433 North Market Boulevard • Sacramento,California 95834-1943• (916)?28,3300• Fax(9162-9PP,'- 341 <br /> at, ccv 2: 15 <br /> February 3, 1994 <br /> Project OC42-001.20 <br /> Ms. Margaret Lagorio <br /> San Joaquin County <br /> Environmental Health Division <br /> 445 N. San Joaquin, P.O.Box 2009 <br /> Stockton, California 95201 <br /> Re: Monitoring Well Permit Application,Port of Stockton Phase II Assessment, <br /> Stockton, California <br /> Dear Ms. Lagorio: <br /> EMCON Associates will be installing groundwater monitoring wells at the Port of <br /> Stockton as part of the Phase R Assessment, the scope of work was presented in <br /> EMCONs July 12, 1993 Workplan for Phase R Assessment. This letter <br /> summarizes the well installation program; the permit application and a check for <br /> permit fees are attached. <br /> Twenty four monitoring wells are proposed in the program and will be completed <br /> at varying depths within the A, B, C, and D water bearing zones (see Figure 1 and <br /> Table 1). Four A zone wells will be installed to approximately 18 feet below <br /> ground surface and be installed using 8-inch diameter hollow-stem auger drilling <br /> equipment (see Table 1 and Figure 1). B, C, and D zone wells will be installed <br /> using 6.5-inch diameter air rotary casing hammer drilling equiment. The casing <br /> hammer drives metal casing to seal the boring from the surrounding formation <br /> and reduces potential cross contamination. Eight B zone wells are proposed for <br /> completion at depths between 35 and 43 feet below ground surface (see Table 1 <br /> and Figure 1). Nine C zone wells are proposed for completion at depths between <br /> 52 and 63 feet below ground surface (see Table 1 and Figure 1). Three D zone <br /> wells are proposed for completion at depths between 87 and 90 feet below ground <br /> surface (see Table 1 and Figure 1). Additional D zone wells may be installed. <br /> Drilling and sampling equipment will be steam cleaned following completion of <br /> each boring. <br /> Monitoring wells will be constructed using 2-inch diameter schedule 40 PVC <br /> casing, screen intervals will consist of 0.020 inch factory slotted pipe with <br />