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SOIL SAMPLING PLAN <br /> AREAS A, B, C . AND D <br /> AREA A : <br /> Background After the Solvent Recovery still was installed <br /> in May of 1982 , still bottom sludge was disposed <br /> of in Area A. Please see attached Exhibit A-1 . <br /> The surface discharge occurred over a short period <br /> of time. Lustre-Cal estimates that no more than <br /> 150 gallons of sludge was disposed of in this <br /> area. <br /> The sludge is the result of boiling down the still <br /> once a month. This boiled sludge was spread while <br /> it was still hot. The sludge is fairly viscous <br /> while hot ; however , it immediately hardens when it <br /> begins to cool . <br /> We have reviewed the facility procedures and work <br /> steps associated with solvent use to identify <br /> all possible sources of hazardous substances. As <br /> a result , we have determined that 1 , 1 , 1 TCA, ace- <br /> tone , aluminum and magnesium are substances likely <br /> to or may possibly be present in the soil in Area <br /> A. <br /> Soil Samples A total of three (3) bores will be drilled in Area <br /> A . Because the material in question rapidly <br /> solidifies when cooling at ambient temperatures , <br /> contamination would be confined in the upper 7 ' of <br /> soil. Samples will be collected at the 2 ' and 7 ' <br /> interval per each bore. If soil analysis at the <br /> 7 ' depth indicate greater than acceptable levels , <br /> an additional round of soil bores and samples will <br /> be inducted to a depth of 15 ' with samples <br /> collected at 10 ' and 15 ' . <br /> (Please see Exhibit "B" for detailed information <br /> on sampling equipment and techniques) . <br />