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r <br /> IL <br /> 8TATE OF CALIFORNIA GEORGE DEUKMEJIAN.Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD MAY 3 i"1 fl, <br /> SACRAMENTO.CA 95827-3098 <br /> 1 May •1990 <br /> Ms. Diane Hinson <br /> Supervising REHS <br /> Environmental Health Division <br /> San Joaquin County Department of Public Health Services <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> FORMER ISC WINES SITE, 1 WEST TURNER ROAD, LODI - PROBLEM ASSESSMENT REPORT <br /> (PAR) , ADDENDUM TO PAR, AND PROPOSAL FOR REUSE OF HYDROCARBON-IMPACTED SOIL <br /> We have reviewed the following reports for this site : Site Assessment Report <br /> Update and Work Status, dated 1 February 1990; Addendum to ISC Winery Report, <br /> dated 16 April 1990; and Utilization of Hydrocarbon-Impacted Soils As Paving <br /> Materials, undated (received on 25 April 1990) . <br /> The first two reports, prepared by Wm. J. Hunter & Associates, review the <br /> activities and sampling conducted during the removal of soil impacted with <br /> No. b fuel oil and diesel , and document the investigations conducted to verify <br /> that ground water has not been impacted by discharges of hydrocarbons at the <br /> site. The third report, prepared by Foothill Engineering, documents the <br /> results of geotechnical investigation and testing conducted to determine <br /> whether the impacted soils are appropriate for reuse as paving materials. <br /> Based on the information provided in the reports, the extent of contamination <br /> has been adequately defined and all impacted soil has been removed from the <br /> subsurface. In addition, the results of the ground water investigations <br /> indicate that ground water beneath the site has not been impacted. Therefore, <br /> the only issue remaining is the ultimate disposition of the stockpile of <br /> hydrocarbon-impacted soil . <br /> According to the Foothill Engineering report, the soil is suitable for use as <br /> cold-mix paving material . Representative samples from the soil stockpile were <br /> treated with a water-based asphaltic emulsion. Various mixing ratios and <br /> curing times were evaluated. The treated samples met or surpassed the <br /> standards for light-duty pavement. The report indicates that success of the <br /> proposed reuse is dependent on the appropriate ratio of soil to asphalt <br /> emulsion, and adequate curing time. Provided these two factors can be <br /> adequately controlled, the proposed reuse of the soil appears to be feasible. <br /> However, prior to implementing the proposed reuse program, the following <br /> regulatory issues will need to be addressed: <br />