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GEOMATRIX <br /> the northwestern portion of the Lathrop Plant. The containment area and sumps will continue <br /> to be used after the closure activities described herein are completed. <br /> ' All residue within the sumps will be removed and the sumps will be hydroblasted. The sump <br /> residue will be stored in a drum, tested for hazardous waste characteristics, and disposed of as a <br /> hazardous waste, if necessary. The hydroblasting rinseate will be stored in a Baker Tank, tested <br /> ' for hazardous waste characteristics, and disposed of as hazardous waste, if necessary. If non- <br /> hazardous, the rinseate will be disposed of at a permitted hazardous waste disposal facility. it is <br /> ' assumed that a total of 10 pounds of sump residue and about 50 gallons of rinseate will be <br /> generated. <br /> ' A total of 13 soil samples will be collected within the secondary containment area. One of the <br /> samples will be collected adjacent to the base of the sump within the containment area and one <br /> ' will be located within the footprint of Tank 128, once the tank has been removed. One sample <br /> will be collected below each of the five flanges connected to Tanks 127 and 128. The remaining <br /> six samples will be surficial samples located at random locations within the secondary containment <br /> area. <br /> One additional soil sample will be collected adjacent to the base of each of the sumps located <br /> outside of the containment area. The approximate location of the samples are indicated on <br /> Figure 2. The actual sample locations will be determined by the licensed engineer during closure. <br /> For areas of soil sampling, surfcial asphalt or concrete pavement will be broken out with a chisel <br /> or removed with a concrete saw. Soil samples will be collected using a drive sampler fitted with <br /> pre-cleaned brass sample tubes. The samples will be collected approximately 6 to 8 inches below <br /> the paved surface, as previously described. The drive sampler will be cleaned between sample <br /> locations. The tubes will be sealed with plastic end caps and tape. After sampling, the pavement <br /> will be replaced with an asphalt patch. The samples will be sealed, labeled, and placed in an iced <br /> ' cooler for transport to the laboratory under chain-of-custody procedures. The soil samples will <br /> be analyzed for DBCP and EDB using EPA Method 8011, organochlorine pesticides using EPA <br /> Method 8080, and organophosphorus pesticides using EPA Method 8140. <br /> If the soil samples contain hazardous waste concentrations of pesticide residues,depending on the <br /> ' quantities involved, Simplot may arrange to remove, treat (if necessary), and dispose of the soil <br /> at a permitted hazardous waste landfill. Groundwater below the site is being collected and treated <br /> to remove pesticide residues, as described above in Section 2.5. The soil surface over most of the <br /> ' Ag Chem area is paved. These conditions provide effective controls for exposure routes and <br /> cleanup beyond hazardous waste concentrations does not appear warranted. <br /> 11 <br /> 1 <br />