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Geological recluuesl4c. Page 6 Sinclair Trucking Project No.: 1030.2 August 11, 2005 2.5.4 Truck Loading Stockpile soil samples were collected on February 25, 2005 and sent to a Forward Incorporated Landfill (Forward) in Manteca, California for profiling. After the profile was ' approved, trucks were loaded in a manner carefully in order to prevent spilling or tracking of contaminated soil. No free draining liquid was allowed. ' Truck loading took place adjacent to the contaminated stockpile area located near the northeast portion of the property (Figure 3). The contractor was responsible for ensuring that ' trucks loaded for off-site disposal are within acceptable weight limits. Approximately 400 cubic yards of contaminated soil was taken to Forward in Manteca, California for disposal on April 11, 2005. ' Forward invoices are included in Appendix D. ' 2.5.5 Site Security The excavation area was cordoned off with caution tape and lighted barricades at the end of each workday. Traffic cones with reflective tape blocked access from the dirt road to insure ' no vehicles accidentally drove into the work area. 2.6 Sampling and Analysis ` Soil samples were collected to evaluate contaminant concentrations at the extent of the excavation. Laboratory results and/or field observations were used to determine if the final extent of excavation was reached. Figure 4 shows the soil sampling locations. 2.6.1 Sampling During Excavation ' During excavation, soil samples were collected into zip-lock baggies and volatile organic compounds measured using an organic vapor meter (OVM). The OVM is a portable photo ionization detector that uses a 10.6 eV lamp to detect compounds with ionization potential ' below 10.6 eV (hydrocarbon range). Readings less than 100 ppm indicated excavation had reached an appropriate terminal point. Soil samples and OVM readings were collected at all extents of the excavation. ' 2.6.2 Sampling Post-Excavation GTI collected six (6) soil samples for analytical evaluation from the sidewalis and bottom of ' the excavation. Four (4) additional stockpile soil samples were' collected from the contaminated soil stockpile. These four samples were composited into two (2) samples for analysis. Soil samples were collected in 6.0-inch brass liners using a 2.0-inch core sampler ' attached to a_ slide hammer. GTI and SICEHD personnel determined the location of the samples during the excavation activities. 1 Five sidewall samples were collected within the zone of contamination determined by field observations during excavation. The core sampler was driven into the chosen sidewall locations approximately 6 inches deep and retrieved. The 6.0-inch brass liner was removed,