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DIAMOND WALNUT GROWERS,INC. <br /> A Grower-Owned cooperative Marketing Association <br /> P.O. Box 1727 • Stockton, CA 95201 • (209) 467-6000 <br /> /Oso S. 01a"6tJe4 S'f. <br /> SWG6P5 (17V <br /> May 30, 1989 01#`40 to <br /> AItEa 3x3 <br /> VWilliam Snavely <br /> San Joaquin Local Health District U`v <br /> 1601 East Hazelton Avenue <br /> jN <br /> P. o. Box 2009 <br /> Stockton, CA 95201 C•:;cFz j St2°\CrS <br /> RE: Diamond Walnut Growers Inc. Underground Storage Tank Investigation <br /> Dear Mr. Snavely: <br /> Enclosed for your review is a copy of the Phase I Underground Storage <br /> Tank Investigation prepared for Diamond Walnut Growers by Weiss Associates. <br /> The report contains the results of soil samples obtained from borings <br /> beneath Tanks 1, 5, 6, 7 and 8 at our Stockton facility, as described <br /> therein. <br /> As the Phase I report indicates, Weiss Associates found concentrations <br /> of ethylene and/or propylene glycol in excess of 1,000 parts per million <br /> (ppm) under Tanks 1 and 6. The soil samples taken from under Tank 5 <br /> revealed no concentrations of ethylene and/or propylene glycol. <br /> Analyses of the soil beneath Tank 8 revealed 'concentrations of hexavalent <br /> chromium that slightly exceeded the California Department of Health <br /> Services (DOHS) Soluble Threshold Limit Concentrations (STLC). In <br /> addition, calcium and chloride concentrations in the soil beneath Tank <br /> 8 exceeded background concentrations of these compounds in native soil. <br /> The analyses revealed no significant contamination under Tank 7. <br /> In light of the discovery of contamination beneath Tanks 1, 6 and 8, <br /> Diamond Walnut proposes to conduct a further soil investigation to <br /> determine the vertical extent of that contamination. That further <br /> investigation plan is set forth in the Phase II Sample Plan which is <br /> also enclosed for your review. <br /> Diamond Walnut and Weiss Associates have expended considerable time, <br /> energy and funds on these two projects. It is our hope that Diamond <br /> Walnut's proposed responses to the tank releases will meet with all <br /> applicable County and Regional Water Quality Control Board requirements. <br /> We request that you review the plan and approve it before we implement <br /> the plan. <br /> —_C <br />