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' \1 <br /> ... Color Spot, Inc. � � <br /> October 10, 1989 (881688) <br /> wthe excavation and the clean soil pile should be sampled (a total of 6 to 8 <br /> samples) and chemically analyzed for TPH; and BTEX by EPA method 8260, modified <br /> for diesel fuel to confirm that the excavation is adequately remediated and the <br /> clean soil pile is in fact below regulatory action levels. <br /> After the soils have been removed, the contaminated soils should be <br /> spread on the surface for aeration. The soils should be turned periodically by <br /> Color Spot personnel. After an aeration period of about three to five weeks, <br /> the soils should be remediated enough to be placed back in the excavation. After <br /> the soils are thought to be remediated, they should be sampled and analyzed for <br /> TPH and BTEX to confirm that the remediation has been successfully completed. <br /> w-. During the aeration period, the soil should be turned twice per week by Color <br /> a <br /> Spot personnel either manually with shovels or with a walk-behind rototiller. <br /> ' # In addition to the soils excavation, SGD recommends quarterly <br /> t sarc'seling for two years of the existing wells (5338, 5298, and House No. 10) to <br /> assure that ground water contamination does not exist 'beneath the site. if r <br /> contaminant• levels increase in any wells, a ground water study will be required. <br /> I <br /> The recommended site remediation program, including the excavation <br /> of the contaminated Eoil, aeration of the contaminated soil and the long-term <br /> monitoring of ground water will have to be conducted under the supervision of <br /> the San Joaquin Local Health District (LHD). The LHD will require submittal of <br /> a technical work plan describing the proposal project for tLeir approval (which <br /> will take four to six weeks) prior to project implementation. <br /> We will be pleased to meet. with Color Spot staff and any concerned <br /> regulatory agency to discuss the results and recommendations of this assessment <br /> and are prepared to assist Color Spot in implementing the recommendations r. <br /> { contained herein. This report has been prepared for the exclusive use of Color ' <br /> fSpot, Inc, with specific application to the site assessment conducted at the <br /> J subject property. The study was conducted in accordance with generally accepted <br /> environmental protocols. No other warranty, express or implied, is made. Should <br /> you have any questions, please call the undersigned or Mr. Gerald Hels of our ; <br /> f. staff. <br /> Sincerely, <br /> t <br /> STfIAL, GARDNER DUNNE, INC. <br /> _. -_. .. -•_ <br /> -------- -_ <br /> David A. Gardner <br /> + -; Engineering Geologist 969 <br /> DG:LL:dm/31T <br /> Enclosures.. Plate 1 - <br /> .. <br /> Appendices A and B <br /> a . <br /> S <br /> rr <br /> Pl T <br /> .r <br />