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r e BP Chemical, Advanced Materials Div., P.O. Box 8189, Stockton, CA October 20, 1992 Mr. Lon Kitagawa 4 Method 504 (for ethylene dibromide [EDB]), and EPA Method 7000 (for total lead). Test results from samples analyzed at the off-site laboratory will.be available approximately 14 days after collection and submittal. Samples of the stockpiled soil will be analyzed for disposal purposes. The analytical methods for those samples include: EPA Method 8015 Modified (for TPH-G); EPA Method 8240 (volatile organic compounds); EPA Method 504 (for EDB); EPA Method 7000 (for total lead); and reactivity, corrosivity, and ignitability. The stockpile soil samples will be analyzed by an off-site, state-certified laboratory. Excavation Backfilling and Site Restoration After the overexcavation has been completed, and the.removal of'affected soil has been confirmed with the analytical results,the excavation will -be backfilled with clean fill material. The clean fill material will be provided by BP Chemical. The source for that material is from an undeveloped portion of the BP Chemical facility. Before backfilling, a sample of the source material will be tested for compaction characteristics. The fill material will be placed in 1- to 2400t-thick layers and compacted to engineering standards for that area. i Following the excavation backfilling and compaction, the ground surface will be leveled and restored to it's original condition. At this time, the ground surface will not be paved or covered with concrete. d ° Soil Disposal The stockpiled soil will be disposed of at an off-site'licensed landfill facility.- The landfill will be chosen based on the analytical results of the samples tested for waste characteristics. Based on the results of the previous site assessment, it is anticipated that soil from this excavation will be accepted at a Class II or Class III landfill, and will.not require special handling as a hazardous waste. Summary Report Preparation Following the above described activities, a summary report will be prepared to document each of the tasks conducted during the corrective action. :The summary report will include a detailed discussion of the field activities, tabulated summary of analytical results, and copies of the certified laboratory data sheets. A request for regulatory site closure by the SJCEHD will be requested-at that time. ❑ GROUNDWATER TECHNOLOGY,INC.