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ceoto icatTec6cxicslrcr. g Page 9 Sinclair Trucking Project No.: 1030.2 August 11,2005 The location of MW-IR is shown on Figure 2 and a borehole log for the replacement well is included in Appendix C. ' 2.8.1 Soil Sampling Procedure P g A professional geologist working under the supervision of a registered geologist maintained ' boring logs providing sediment descriptions using the USCS and held observations. Soil samples were collected continuously via direct push rods containing acetate tubes, as the ' rods advance in four-foot intervals, filling a clear acetate core tube with soil. The tube is removed at 4-foot intervals and the soil is logged and selected samples are cut from the acetate tube, sealed with Teflon tape and plastic caps, labeled with field identification, and put on ice for transport to laboratory for analyses following Chain of Custody protocol. Since only selected soil samples were to be submitted for laboratory analysis, a screening ' process was used to gather additional information through field observation. The following characteristics were noted: • Sediment type, especially grain size and clay content ' • Moisture content • Visible evidence of contamination, i.e., color change due to reduction of iron or discoloration from hydrocarbons and other pollutants • Readings above background on 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). ' After the soil sampling was complete the rods were removed and the borehole was over drilled using hollow stem augers as discussed in Section 2.8. A borehole log for the replacement well is included in Appendix C. 2.8.2 Soil Sample Analysis Based on field screening observations, three (3) soil samples from MW-1R were submitted to ' Excelchem Environmental Labs of Roseville (State Certified Laboratory #2119) for the following analysis: • Benzene, Toluene, Ethyl benzene and Xylene(BTEX by EPA method 802IB/8015M) ' • Gasoline range petroleum hydrocarbons (TPH-G by EPA method 8021B/8015M) • MtBE by EPA method 802lB/8015M A Chain of Custody was completed for all samples collected and.tracked to ensure sample - integrity. The results of the laboratory analyses for soil samples collected during well installation are summarized in Table 3: Soil Analytical Data—Monitoring Wells of Appendix A. Detection limits and analytical results are presented in the Laboratory Analytical Data Sheets (Appendix B).