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DDTC-id PAGE 2 2 0 MAY 1987 Mr , Donald Shaulls All laboratory data shall ba submitted to the Department of Health Services and shall include photos, diagrams of sampling locations and complete laboratory analysis . As identified in Section Ill (Decontamination The Facility) A. 1 . b . .of the Closure Plan (reference b) , the criteria for determining contamination shall include analysis for pH and Methyl Ethyl Ketone (MEK) . The pH shall be determined by the Standard Methods for the Examination of Water and Waste Water , 15th Edition, and the MEK shall be determined by EPA Test Method 8015. As identified in ,reference c , once the tank has been excavated and emptied of its contents, the tank shall be moved away from the excavated area and the following work shall be performed : Triple rinse tank ( flush tank three times) each time using a volume of rinss solution equal to approximately 10% of the tank 's capacity. Rinse solution shall be determined by the Contractor and shall be of sufficient composition to neutralize contents of the tank. Rinse solution is to ba sprayed over . the entire Internal area of the tank , '. Rinne solution shall be pumped by, the Contractor Into Government furnished containers after each rinse . DibG•csal of tilled containers is the responsibillty ,of• the Government_-. ' Thi=_ tank- ehail be cut-up for scrap metal prior to transporting , cutting or welding of tanks. The :c•ntractor is required to comply with NFPA 327 ( 1 +$2) requirements . Whi ; a the tanks are on the project site , .rrater is not permitted to clean tree inside or outside of tanks. Underground Tank. Warehouse 28 : This tank was operable from 1959 to 1987. Residuals from- Isaking Containers were collected vis a . floor drain Into this tank. Warehouse 28 presently and historically steres thousands of flaermable , corrosives , oxidizers , '.'pest1sIde5 'and compressed gases . Based on this , a list of known and suspected materials historically collected is not possible. For this reas•_n , the wide range of tests to be performed on the soil beneath this tank was developed (see reference e) . Immediately upon removal of this tank, five individual .sampler. (one sample from each corner and one from the center of the tank) shall be collected from a depth of one foot . The five samples shall be obtained and a single composite sample obtained and submitted for laboratory analysis. The three foct sample originally identified in references b and c . wlll not be required unless laboratory analysis of the composite sample' ln•dicatee soil contamination.