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09/25/97 THU 09:49 FAX 510 351 0221 TERRA VAC NOR CAL 10002 <br /> TERRA VAC <br /> Two of the six sampling points to be placed around the former UST complex will be used <br /> specifically for the collection of a discrete groundwater and soil samples from a depth of <br /> approximately 40 feet below grade. One of the two sampling points will be located within the <br /> former UST complex, the other will be located onsite and downgradient of the former UST <br /> complex. <br /> "The workplan states that former well surveys conducted "did not identify groundwater <br /> receptors within a radius of 1 000feet. "It should be noted that well surveys should he conducted <br /> for a radius of 2000 feet. " <br /> Well surveys have been completed that encompass a radius of 2000 feet from the site. The <br /> statement in the workplan is informational only. <br /> "In addition a site map should be provided that shows every underground utility line and private <br /> trench and/or area that will support or influence vertical and/or horizontal migration of <br /> contaminants at this UGT site. " <br /> Terra Vac submitted a Utility Survey and Plume Stabilization Evaluation report in April 1997. <br /> Included in the report is a site map illustrating all known potential preferential pathways <br /> extending from the site. Existing groundwater monitoring wells and the former UST complex <br /> that may act as pathways for vertical migratior, of contaminants are also illustrated on the site <br /> map. <br /> "Please provide a well survey of wells within 2000 feet of the site.... " <br /> As stated above well surveys have been performed that encompass a radius of 2000 feet from the <br /> site. <br /> EA Engineering, Science and Technology. October 1987, Report of Investigation Chevron <br /> SS 9-4054. Includes a one-half mile radius well survey <br /> Gettler-Ryan, January 1996, Well Survey for Former Chevron Service Station #94054. A <br /> door to door survey of properties within approximately 200 feet downgradient of the site. <br /> Terra Vac has scheduled the work described in the Additional Soil and Groundwater <br /> Investigation Workplan, as amended herein, for September 29 and 30, 1997. Please contact me if <br /> you have questions and or comments. <br /> Sincerely, <br /> Terra Vac Corporation <br /> D GFp��C\ <br /> Cli . Garr es A. Perkins,R.G. <br /> Project Manager JAMEESSPENINS D ision Manager <br /> N° 4472 <br /> �lQ GP��P piint;rr on re-c yelet3 papei <br /> OF CAF <br />