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Ms. Letitia Briggs Project 20805-224.002 <br /> March 24, 1999 <br /> Page 3 <br /> presents a summary of the analytical results. Copies of certified analytical reports and chain-of- <br /> custody documentation are presented in Appendix B. <br /> Overexcavation Verification Soil Sample Results <br /> TPHG was detected in two of the three overexcavation soil samples at concentrations of 9.18 <br /> mg/kg in PL-8 (5') and 1.59 mg/kg in PL-SSW (3.5'). Benzene and MTBE were detected in <br /> sample PL-8 (5') at a concentrations of 0.0609 mg/kg and 11.1 mg/kg, respectively. Copies of <br /> certified analytical reports and chain-of-custody documentation are presented in Appendix B. <br /> Soil Stockpile Sample Results <br /> Soil stockpile sample SP-1 contained TPHG, toluene, ethylbenzene, total xylenes, and total lead <br /> concentrations of 8.06 mg/kg, 0.228 mg/kg, 0.133 mg/kg, 1.07 mg/kg, and 32.2 mg/kg, <br /> respectively. Copies of certified analytical reports and chain-of-custody documentation for the <br /> stockpile samples are presented in Appendix B. <br /> CONCLUSIONS <br /> Verification soil samples contained non-detectable to low concentrations of TPHG, benzene, <br /> toluene, ethylbenzene, total xylenes, and MTBE. Tert-butyl alcohol was detected at a <br /> concentration of 44.0 mg/kg in PL-10 (4.3'). <br /> Sincerely, <br /> Pinnacle <br /> David Foley Mark Capps, R.G. 6561 <br /> Staff Geologist Project Geologist <br /> CP\E:\ARCO\5469\REPORTS\5469P102.DOC-95\Isga �CKsil{CQ8 <br />