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Diesel Impacted Soil Removal Report May 2010 California Army National Guard Armory Lodi, CA In addition to pre-characterization samples, OTIE also collected a four-point composite soil sample from within and immediately surrounding the area visually indicative of diesel fuel impacts to profile material for disposal. The waste characterization sample(LODI-WC-01)was analyzed for the following constituents, as requested by the proposed disposal impoundment: • TPH-D using EPA Method 801513; • Volatile Organic Compounds (VOCs)by GC/mass spectrometry(GC/MS)using EPA Method 826013; • Pesticides using EPA Method 8081A; • Polychlorinated Biphenyls(PCBs)using EPA Method 8082; • Total Metals using EPA Methods 6010B and 7471A; • Moisture using American Society for Testing and Materials (ASTM)Method D216/CLP; and • Chlorophenoxy Herbicides by EPA Method 8151. Laboratory analytical reports for pre-characterization and waste characterization samples are presented on CD as Appendix D. 3.3 EXCAVATION AND CONFIRMATION SAMPLING On April 2,2010, and subsequent to receipt of analytical results for pre-characterization soil samples (Section 4.1 and Appendix D), OTIE mobilized to the site to oversee excavation of diesel fuel impacted soils and site restoration with clean fill. Sequoia Construction(Sequoia), a licensed excavation contractor, provided excavation and restoration services under subcontract to OTIE. Based upon the results of pre-characterization sampling, Sequoia excavated an area approximately 10 feet wide by 10 feet long by 3 feet deep within the general footprint of the area previously covered with plastic and identified as potentially impacted. The approximate extent of the excavation relative to the rectangular,plastic-covered area is shown in Figure 4(Appendix A). In accordance with the strategy outlined in the Workplan, Sequoia loaded excavated soils directly into an end-dump truck for purposes of off-site transportation and disposal. Following completion of excavation activities, OTIE collected confirmation soil samples including two floor samples (LODI-SO-10 and LODI-SO-11)and sidewall samples from the south,west,north, and east walls of the excavation(LODI-SO-12,LODI-SO-13,LODI-SO-14, and LODI-SO-15,respectively). The locations of the confirmation samples are indicated in Figure 4(Appendix A), and are documented along with other photographs taken during excavation activities in the photographic log(Appendix B). Field notes documenting site activities related to soil excavation are presented in Appendix C. 3.4 BACKFILLING AND WASTE DISPOSAL In accordance with the strategy for pre-characterizing waste for disposal, and based on the analytical results for testing described above, excavated soils were directly loaded into an end-dump truck operated through Intrinsic Transportation, Inc. (Intrinsic)under subcontract to OTIE. Prior to implementation of excavation activities,Intrinsic coordinated transportation of clean backfill to the site in the same end- dump truck. The clean backfill consisted of approximately 21 tons of 3/4-inch AB-2 aggregate provided by Teichert Aggregates in Tracy, California. The backfill was compacted approximately consistent with the surrounding soil by hand-operated vibrators,backhoe shovel, and wheel-rolling. At the direction of site representatives, additional clean fill