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Diesel Impacted Soil Removal Report May 2010 California Army National Guard Armory Lodi, CA was used to backfill small potholes throughout the parking area. Photographs documenting the condition of the excavation area following backfilling and compaction are presented in Appendix B. Following excavation activities,the non-hazardous waste manifest for excavated soils was signed by the site representative. A total of 14.14 tons of soil,which had been profiled As Class II nonhazardous waste and previously approved for disposal,was removed from the site at that time and transported to the Recology Hay Road landfill in Vacaville, California for disposal. Documentation associated with the imported clean fill and waste transport and disposal are presented in Appendix E. 4.0 FINDINGS 4.1 PRE-CHARACTERIZATION SAMPLING On January 28,2010, OTIE collected soil samples from multiple locations and depths in the area impacted with diesel fuel to estimate the lateral and vertical extent of soil exceeding the 100 mg/kg threshold for TPH-D. Additionally, OTIE collected a four-point composite soil sample for the purpose of profiling waste materials for disposal. The strategy for pre-characterization sampling,as defined in the Workplan,was to facilitate direct loading and disposal of excavated materials and backfilling with clean fill immediately following excavation activities so as to provide minimal disruption of mission-related activities at the site. Pre-characterization results for soil samples indicated in Figure 3 are summarized in Table 1 below. Laboratory analytical results for pre-characterization and waste characterization soil samples are presented on CD as Appendix D. Table 1 Pre-Characterization Soil Sample Results Sample ID Sample Location Sample Depth TPH-D(mg/kg) LODI-SO-01 3 feet outside center of spill area 20 inches 2.2 (along middle of western sidewall) LODI-SO-02 3 feet outside center of spill area 18 inches 11 (along middle of northern sidewall) LODI-SO-03 3 feet outside center of spill area 18 inches 13 (along middle of eastern sidewall) LODI-SO-04 5 feet outside center of spill area 18 inches 19 (along middle of southern sidewall) LODI-SO-05 Center of spill area 6 inches 13,000 LODI-SO-06 Center of spill area 40 inches 2.2 LODI-SO-07 2.5 feet south of center of spill area 18 inches 3.7 LODI-SO-08 3 feet south of center of spill area 32 inches 1.5 LODI-SO-09 3 feet northeast of center of spill area 12 inches 16 Consistent with the pattern expected from the physical condition of the reported fuel release,the highest impacts from TPH-D in soil were generally shallow and in the approximate center of the area covered with plastic, as shown in Figure 3 and Table 1. Only one sample(LODI-SO-05)exceeded the 100 mg/kg threshold for TPH-D (13,000 mg/kg).