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57W A7 U5 <br /> ENVIRONMENTAL,INC. 3330 Cameron Park Drive, Ste 550 <br /> Cameron Park, California 95682 <br /> (530)676-6004-Fax:(530)676-6005 <br /> September 14, 2006 <br /> Project No. 2007-0835-01 <br /> Mr. Michael J. Infurna, Jr. <br /> Lr11L���L�LI�/�I"i_ << <br /> San Joaquin County SEP 2 0 20G6 <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor ENVIRONMENT Nr---' �l� <br /> Stockton, California 95202 PERMIT1'SERVI1C --) <br /> Subject: Well Installation Work Plan Addendurn <br /> Palisades Gas and Wash Station No. 835 <br /> 2705 Country Club Boulevard <br /> Stockton, California <br /> Dear Mr. Infurna: <br /> Stratus Environmental Inc. (Stratus) has prepared this Well Installation Work Plan <br /> Addendum (Addendum), on behalf of Palisades Gas and Wash (Palisades), for Station <br /> No. 835 (the site), located at 2705 Country Club Boulevard, Stockton, California (see <br /> Figure 1). In a letter dated February 21, 2006, San Joaquin County Environmental Health <br /> Department (SJCEHD) requested that previously documented petroleum hydrocarbon <br /> impact to groundwater be further assessed. Stratus subsequently submitted Well <br /> Installation Work Plan (Work Plan) on behalf of Palisades on April 7, 2006. The scope <br /> of work proposed in the Work Plan included the installation of six deeply screened <br /> groundwater monitoring wells, through permanently installed conductor casing, with the <br /> screening interval of each monitoring well situated below the first water bearing interval. <br /> In a letter dated August 3, 2006, SJCEHD approved the scope of work presented in the <br /> Work Plan. However, SJCEHD personnel stipulated in the letter that the deeply screened <br /> monitoring wells be completed through conductor casing that is centralized within the <br /> borehole. Given this requirement, the previously proposed drilling method (hollow stern <br /> auger) does not appear to represent the best available drilling technology for completing <br /> the deeply screened monitoring wells. <br /> Stratus is proposing to complete the six deeply screened monitoring wells using the sonic <br /> drilling method. Using this drilling approach, each deeply screened monitoring well will <br /> be constructed through steel drive casing that is retracted from the subsurface during well <br /> construction. Prior to the advancernent of borings MW-12 through MW-14, MW-18, <br /> MW-19, and MW-21 to the lower water bearing interval, residual groundwater situated <br /> K:AC7SA GasolineA0835AWork Plans\USA835 workplan addendum 2006.doc <br />