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Defense Logistics Agency - 2 - April 23 , 1987 III B-1 (a) The tank shall be triple rinsed or otherwise deconta- minated. The rinsewater and cleaning residues shall be managed as hazardous waste. After decontamination, the tank must be disposed of properly; however, it is no longer con- sidered a hazardous waste and is not required to go to a Class I landfill. Tank at Warehouse 28 Section 1 A 5 (a) Provide a list of known and a separate list of sus- pected flammable liquids, corrosives, oxidizers and pes- ticides which have been stored in this tank. III A - 1 (a) A composite soil sample shall be collected from a depth of one foot below the tank bottom. The composite sample submitted for laboratory analysis shall be obtained immediately upon tank removal and shall be a composite of five samples collected at one foot depth below the tank bottom. This composite sample shall consist of one sample from the center of the tank and four samples collected at the perimeter of the tank and spaced at intervals of one fourth of the tank circumference. The three foot depth sample described in the closure plan will not be required unless laboratory analysis indicates soil contamination. In addition, any visibly contaminated soil shall be sampled and analyzed for all the parameters listed in Section III A-1 B of The Closure Plan. If any of the sampling areas designated to be part of the composite are visibly contamin- ated, these areas shall be sampled and analyzed separately and not included in the composite sample. Submission of laboratory data to this Department shall in- clude a diagram of where the samples were collected. III A 1 (b) Designate laboratory methods for pH and MEK analysis. Both Tanks In addition to the above, you are also required to provide the following information. Please submit to the Department planned methodology for storing and handling excavated soil and for protecting the excavated hole pending review of laboratory results by this Department. You are required to notify this office promptly if any leak is indicated either through precision testing or visual observations. Prior to receiving authorization to backfill the excavation, DDTC shall provide the Department with the following: 1) Analytical results from soil testing (include refer- ence lab test method) .