Laserfiche WebLink
*MEMORANDUM <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION <br /> 3443 Routier Road, Suite A Phone: (916) 361-5600 <br /> Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 <br /> TO: Wendy L. Cohen FROM: Philip S. Isorena <br /> Senior Engineer Associate Engineer <br /> DATE: 22 April 1993 SIGNATURE: � � <br /> SUBJECT: SOIL REMEDIATION WORK PLAN, LIBBEY-OWENS-FORD, LATHROP, SAN JOAQUIN COUNTY <br /> Background <br /> Libbey-Owens-Ford (LOF) submitted a 25 March 1993 work plan for remediation of <br /> contaminated soils which are currently stockpiled onsite. The soils were <br /> contaminated by a spill of appproximately 10,000 gallons of diesel fuel from <br /> aboveground petroleum storage tanks. <br /> LOF proposes to land treat approximately 1,500 cubic yards of contaminated soils, <br /> which are divided into four sections of 300 CY, 350 CY, 450 CY, and 400 CY. The <br /> tests results of the composite samples from each section are presented in Attachment <br /> 1 . The average petroleum hydrocarbon constituent concentrations of the four <br /> composites are as follows: TPHD - 19, 100 ppm; toluene - 6.3 ppm; ethylbenzene - 9.9 <br /> ppm; and xylene - 22. 1 ppm. <br /> The treatment will consist of spreading the contaminated soils into a half-inch <br /> layer over 25-30 acres of fallow land, applying fertilizer, and discing about 12 <br /> inches into the native soils. Weekly tilling of the soils for eight weeks is <br /> proposed. The basis for the proposal is the Board's 'approval of similar operations <br /> in 1985 and 1986 which involved treatment of 200 CY and 60 CY, respectively, of <br /> soils contaminated with fuel . <br /> LOF proposes to apply the General Risk Appraisal method described in the Leaking <br /> Underground Fuel Tank Manual (LOFT) and the following soil cleanup levels: TPHD - <br /> 100 ppm; Toluene - 4 ppm; Ethylbenzene - 30 ppm; and Xylene - 20 ppm. LOF also <br /> proposes to start remediation within 24 months of approval from the Board, the <br /> amount of time needed to assess utilization issues of the proposed application plot. <br /> General Comments <br /> We do not use the LUFT manual as a guide in assessing a site's impacts to water <br /> quality. Instead, we apply the designated level methodology which is partly <br /> explained in the draft document Water Quality Site Assessment for Soils and Ground <br /> Water, Attachment 2. LOF should use this document describes how a site-wide water <br /> quality assessment should be conducted to determine the impact of soil contaminants <br /> on ground water quality. <br /> Specific Comments <br /> 1. Using the average concentrations of the four composites to determine the <br /> characteristics of the stockpile is not realistic since the soils are not <br /> completely miscible. It is more realistic to use the section of the stockpile <br /> with the highest concentration to determine whether there will be an impact on <br />