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REEIVE <br />MAY 2 12004 <br />ENVIRONMENT HEALTH <br />PERMIT/SERVICES May 21, 2004 <br />Project 62400145 <br />Ms. Vicki McCartney, REHS <br />San Joaquin County <br />Environmental Health Department <br />304 East Weber Avenue, Third Floor <br />Stockton, California 95202-2708 <br />Dear Ms. McCartney: <br />Subject: Subsurface Investigation Work Plan <br />The Earthgrains Company Facility <br />2651 ;South Airport Way - Stockton, California <br />This letter is in response to your April 15, 2004 correspondence to Sara Lee <br />Bakery Group that provided recommendations to the February 20, 2004 <br />Subsurface Investigation Work Plan (Plan) for the subject facility. Your <br />recommendations are summarized below and are followed with our response. <br />Advancement of one additional boring, B-7, to a depth of approximately 35 feet <br />bgs located adjacent to the sump north of the former dispenser to characterize <br />lithology and assess the vertical extent of impacted soil. <br />To address your recommendation, we propose that the location of boring B-3 be <br />adjusted about 10 feet to the west as originally proposed to assess subsurface <br />conditions in this area. It is our opinion that data from this boring and the nearby <br />boring B-2 will adequately assess the magnitude and extent of impacted soil north <br />of the former USTs. <br />Advancement of at least one CPT boring to a depth of 120 feet using at least <br />one of the proposed boreholes located near the former USTs to characterize <br />hydrogeology and lithology. <br />We agree that one boring should be driven to a relatively deeper interval in this <br />area to characterize lithology. However, we would propose the depth to be 100 <br />feet rather than the recommended 120 feet because this shallower depth will be <br />the maximum interval where we will propose the collection of groundwater <br />samples (see following item). <br />r' <br />