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STATE OF CALIFORNIA PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL <br /> OARD CENTRAL VALLEY REGION ,g <br /> 3443 ROUTIER ROAD, SUITE A 57`;'. <br /> SACRAMENTO, CA 95827-3098 fi=x tL <br /> PHONE' (916) 361-5600 %4'f -* ' �+'"-.'' <br /> FAX: (916) 361-5686 MAY 14 1992 <br /> ENVIRONMENTAL HEALTH <br /> 12 May 1992 PERMIT/SERVICES <br /> Mr. Michael J. Leacox <br /> Harding Lawson Associates <br /> 3247 Ramos Circle <br /> Sacramento, CA 95827 <br /> SLANT BORINGS WORK PLAN, USC STOCKTON FACILITY, SAN JOAQUIN COUNTY <br /> We have reviewed Harding Lawson Associates (HLA) workplan dated 28 April 1992. <br /> HLA proposes the field investigation to characterize the vadose zone beneath <br /> USC's surface impoundment to develop a closure plan. The following are our <br /> comments to the workplan: <br /> 1. The surface impoundment wastewater characterization showed high TDS <br /> including sodium and boron. USC personnel now adds phosphoric acid to <br /> neutralize caustic solutions in the equalization tank. Therefore, in <br /> addition to the proposed volatile, semi-volatile and metal analysis to <br /> the selected six soil samples from the slant borings, a soluble <br /> salts/general mineral analysis needs to be added to the proposed suite. <br /> 2. We suggest that HLA reserve a boring sample, not influenced by the <br /> surface impoundment, for analysis of metals and minerals at an <br /> appropriate lithologic interval for comparison if the chemical analysis <br /> indicates leakage from the surface impoundment. <br /> If you have any questions please call me at (916 ) 361-5738. <br /> o', Y <br /> JAh1ES BRATHOVDE <br /> Associate Engineering Geologist <br /> JEB <br /> cc: Mr. Mike Inferna, San Joaquin County Environmental Health, Stockton <br /> Mr. Kirk Moon, USC Stockton Facility, Stockton <br />