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1 GEQMATRIX 6.3 Closure of Underground and Aboveground Stormwater Drainage Piping ' The underground stormwater drainage piping consists of approximately 900 feet of piping assumed to be 4-inch diameter polyvinyl chloride pipe (PVC). This piping will be decontaminated by pressure washing. A total of approximately 400 gallons of rinseate is expected to be generated during the pressure washing operation. This rinseate will be stored in a Baker Tank, analyzed for hazardous characteristics, and disposed of as a hazardous waste, if necessary. If found to be non- hazardous, the rinseate will be disposed of at a permitted hazardous waste disposal facility. ' Upon completion of pressure washing, final rinse samples will be obtained in each section of cleaned pipe for a total of four samples. These samples will be analyzed for DBCP and EDB using EPA Method 8011, organochlorine pesticides using EPA Method 8080, and organophos- phorus 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, it is planned to leave the under- ground piping in-place for continued use as stormwater drainage piping. The aboveground stormwater drainage piping consists of approximately 500 feet of 4.0 inch diameter steel pipe. This piping will be decontaminated by pressure washing. A total of approx- imately 500 gallons of rinseate will be generated during the pressure washing activities. This rinseate will be stored in a Baker Tank, analyzed for hazardous waste characteristics, and disposed of as a hazardous waste, if necessary. If found to be non-hazardous, the rinseate will be disposed of at a permitted hazardous waste disposal facility. Upon completion of pressure washing, a final rinse sample will be obtained at the discharge point of the aboveground pipe. This sample will be analyzed for DBCP and EDB using EPA Method 8011, organochlorine pesticides using EPA Method 8080, and organophosphorus pesticides using ' EPA Method 8140. Clean closure will be achieved if the analytical results are non-detect. Upon demonstration of clean closure, the aboveground pipe will continue to be used as stormwater drainage piping. As an option, portions of the cleaned piping may be scrapped. ' 6.4 Closure of Pumps P ' Each of the three pumps will be decontaminated by flushing with approximately 20 gallons of water. The rinseate will be stored in a Baker Tank and will be disposed of as a hazardous waste. Closure of the pumps will be demonstrated by collecting final flush samples from each pump for ' a total of three samples. The samples will be analyzed for DBCP and EDB 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 pumps will be reused at the Lathrop facility. 9