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' SOIL ED AVATM AND SUBSURFACE INVESTIGATION RESULTS REPoRT 32 Tokay Street Lodi California 3 3 Sori Stock >le Sam2ling and Disposal ' On December 14 and 16, 1992, soil samples were collected from the stockpile of approximately 200 cubic yards generated during the additional excavation The samples were submitted to Sparger and composited into two samples (SP-1 AB,CD and SP-2 AB,CD) for analysis The samples were analyzed for a) BTEX, b) TPH, as gasoline, c) TPH, as diesel, d) total metals, e) soluble arsenic, and f) reactivity, corrosivity, and ignitability The analytical results are summarized in Table 2 The laboratory analytical reports and chain-of-custody forms are included in Appendix C The analyses were performed to profile the soil as nonhazardous material for disposal at the Forward landfill The analytical results indicated no concentrations of organic or inorganic constituents exceeded state-designated hazardous waste levels The soil was loaded and hauled to Forward on January 27, 1993 Soil disposal documentation is included in Appendix G 3.4 Excavation Backfilling The excavation was completed on December 16, 1992, and backfilled with 8 to 9 feet of t1/2 inch drain rock to eighteen inches below grade The final 18 inches was completed with aggregate base material and compacted to a minimum of 95 percent The backfilling and compaction was completed under the direction of Raney Geotechnical of West Sacramento, California The soil engineering report is included in Appendix D On Friday, January 29, 1992, the remaining 4 inches below grade was paved with asphaltic concrete by Manley and Sons Trucking 3.5 Soil Boring and Sampling ITo confirm the limited vertical extent of TPH, as diesel, beneath the excavation and warehouse building, the County requested drilling and sampling of soil borings IOn January 25, 1993, borings AB, SB-1, and SB-2 were drilled to approximately 30 feet below surface at the locations shown on Figure 3 Boring AB was an angled boring drilled 2 5 feet away from the warehouse at approximately 15 degrees from vertical Barings SB-1 and SB-2 were drilled as vertical borings The borings were drilled using 6-inch-diameter hollow-stem augers During drilling, the subsurface soils and alluvial materials of the unsaturated (vadose) zone were sampled at 5-foot intervals Logs of the soil borings were generated based from 1 field descriptions and are included as Appendix E After completion, the borings were 1 grouted with bentonite cement under the supervision of County personnel Soil cuttings were profiled and disposed of along with the stockpiled soil ! 92-074A EAR -4-