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' STAI&OF CALIFORNIA <br /> GEOflGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD em <br /> SACRAMENTO,CA 95827-3098 <br /> 12 October 1989 <br /> Ms. Jeanne Zolezzi <br /> Numiller & Beardslee, Attorneys <br /> Fifth Floor Waterfront Office Tower II <br /> 509 West Weber Avenue <br /> Stockton, CA 95203-3165 <br /> ROEK BROTHERS SITE, 102 SOUTH WILSON WAY, STOCKTON, SITE INVESTIGATION WORK <br /> PLAN <br /> We have reviewed the 11 September 1989 Site Investigation Work Plan prepared <br /> by Leedshill-Herkenhoff, Inc. , for this site. Because this investigation is <br /> related to former underground storage tanks, oversight of the investigation <br /> has been referred to the underground tank unit. <br /> Ground water samples obtained from the on-site monitoring wells indicate that <br /> hydrocarbon contaminants are present in ground water beneath the site. The <br /> highest levels of contamination detected are in the monitoring well adjacent <br /> to the former underground tank location. The proposed work plan includes <br /> installation and sampling of two additional ground water monitoring wells to <br /> determine whether the contaminants originated from an on-site or off-site <br /> source. <br /> Because the proposed monitoring wells and soil borings will provide additional <br /> information regarding the extent of soil and ground water contamination, We <br /> can agree with the contents of the work plan with the following conditions: <br /> - The former underground tank location at the southern end of the site is <br /> to be investigated. <br /> - If contamination is detected in proposed monitoring well MW-4, <br /> additional investigation may be necessary to evaluate background water <br /> quality conditions. <br /> - The monitoring wells designations for MW-1 and MW-3 have been reversed <br /> between the Balbi & Chang report (24 April 1989) and the current <br /> proposal . This discrepancy must be addressed. <br /> - The screened intervals for the proposed monitoring wells are to be <br /> designed to extend above the water table. <br />