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GEOMWMIX 6.7 Closure of Underground Storage Tank The underground storage tank is a buried steel tank encased in concrete. The tank will be removed during closure activities and transported to an plastic lined area within the rail car loading area. Prior to removal, any sludge or tank residuals will be removed, Once the tank has been moved to the lined area, the top of the tank will be exposed and the interior will be bydroblasted. Rinseate from the hydroblasting will be stored in a Baker Tank, tested for hazardous waste characteristics, and disposed of as hazardous waste, if necessary. If non-hazardous, the rinseate will be disposed of at a permitted hazardous waste disposal facility. It is assumed that approximately 100 gallons of rinseate will be generated. Closure of the tank will be demonstrated by collecting a final rinseate samples. The sample will be analyzed for DBCP and EDS using EPA Method 8011, organochlorine pesticides using EPA Method 8080, and organophosphorus pesticides using EPA Method 8140. Clean closure will be achieved if the results of the analyses are all non-detect. Upon demonstration of clean closure, the tank will be disposed of as non-hazardous. If clean closure is not achieved, the tank will be disposed of as a hazardous waste. A total of two soil samples will be collected within the bottom of the tank excavation. If groundwater is encountered in the bottom of the excavation, the samples will be obtained from the excavation sidewalls. The approximate location of the samples are indicated on Figure I The actual locations will be determined by the licensed engineer during closure. Soil samples will be collected using a drive sampler fitted with pre-cleaned brass sample tubes, The samples will be collected approximately 6 to 8 inches below the excavation surface. The drive sampler will be cleaned between sample locations. The tubes will be sealed with plastic end caps and tape. The samples will be sealed, labeled, and placed in an iced cooler for transport to the laboratory under chain-ofcustody procedures. The soil samples will be analyzed for DBCP and EDB using EPA Method 8011, organochlorine pesticides using EPA Method 8080, and organo- phosphorus pesticides using EPA Method 8140. If the soil samples contain hazardous waste concentrations of pesticide residues,depending on the quantities involved, Simplot may arrange to remove, treat (if necessary), and dispose of the soil at a permitted hazardous waste landfill. Groundwater below the site is being collected and treated to remove pesticide residues, as described above in Section 2-5, The soil surface over most of the Ag Chem area is paved. new conditions provide effective controls for exposure routes and cleanup beyond hazardous waste cdncentrations does not appear warranted. 12 I ZO 'd C5t81 NOW 66-Z1-83S