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Chevron Pipeline Easement Environmental Assessment Report <br /> November 21,2001 <br /> Page 8 <br /> 4.2 LABORATORY ANALYTICAL RESULTS <br /> 4.2.1 Soil Sample Analytical Results <br /> Laboratory analytical results indicate that, in soil samples collected from 17 soil borings with visual <br /> contamination, TEPH-C was detected at concentrations ranging from 470 mg/kg to 29,000 mg/kg. <br /> TEPH-C was detected at a concentration of 11 mg/kg, near the laboratory detection limit, in a soil <br /> sample collected from an 18th soil boring. TEPH-C was detected at concentrations of 13 mg/kg, 65 <br /> mg/kg, and 150 mg/kg in soil samples collected from three additional soil borings in which there was no <br /> - visible soil contamination. Benzene, toluene, and xylenes were detected at concentrations of 0.2 mg/kg, <br /> 0.037 mg/kg, and 0.2 mg/kg, respectively, in the soil samples collected from soil boring GP152. BTEX <br /> constituents were not detected at or above the laboratory practical quantitation limit in any other soil <br /> �- sample. Detectable concentrations of PNAs in the 18 soil samples analyzed for PNAs ranged from 0.007 <br /> mg/kg to 16 mg/kg. Soil sample analytical results for samples that contained detectable concentrations of <br /> petroleum hydrocarbons are presented in Table 3 and Table 4. Spreadsheets with all soil sample <br /> analytical results are located in Appendix C. Copies of the laboratory analytical reports and chain-of- <br /> custody forms are located in Appendix D, contained in Volume I1. <br /> Table 3----Soil TEPH--C and BTEX Analytical Results <br /> Depth to TEPH-C Benzene Toluene Ethylbenzene Xylenes <br /> Sample Number Contamination(ft) Depth(ft) mg/kg mg/kg mg/kg mg/kg mg/kg <br /> 2496J 1-GP9-]6.0 15.5 16 640 <0.005 <0.005 <0.005 <0.005 <br /> 2496J1-GP33-17.5 12.0 17.5 470 <0.005 <0.005 <0.005 <0.005 <br /> 2496J1-GP53-13.5 10.0 13.5 13,000 <0.1 <0.1 <0,1 <0.1 <br /> 249611-GP64-16.0 4.0 16 7,600 <5.0 <5.0 <5.0 <5.0 <br /> 2496J2-GP79-26.5 18.5 26.5 2,100 <0.005 <0.005 <0.005 <0.005 <br /> 2496J2-GP96-25.0 9.5 25 2,200 <0.1 <0.1 <0,1 <0.1 <br /> 2496J2-GP97-21.5 5.5 21.5 4,500 <0.5 <0.5 <0.5 <0.5 <br /> 24967]-GP108-1 1.5 Not observed 11.5 13 <br /> 2496J 1-GP 117-16.0 10.5 16 480 <0.1 <0.1 <0,1 <0,1 <br /> 249671-GP120-9.5 6.5 9.5 610 <0.1 <0.1 <0.1 <0.1 <br /> 2496J1-GP152-6.5* 4.5 6.5 19,000 0.2 <0.1 <0.1 0.2 <br /> 2496J1-GP152-16.0* 4.5 16 880 0.034 <0.005 0.037 0.11 <br /> 2496J1-GP156-12.0 4.0 12 29,000 <0.5 <0.5 <0.5 <0.5 <br /> 2496J1-GP157-12.0 4.0 12 6,300 <0.5 <0.5 <0.5 <0.5 <br /> 2496J1-GP158-12.0 4.0 12 2,700 <0.1 <0.1 <0,1 <0_1 <br /> 2496J 1-GP 160-12.0 4.0 12 3,700 <0.1 <0.1 <0.1 <0.1 <br /> 2496J1-GP161-15.5 5.0 15.5 25,000 <0.5 <0.5 <0.5 <0.5 <br /> 2496J3-GP174-20.0 18.5 20 11 <br /> 2496J3-GP 175-20.0 7.0 20 12,000 <0A <0.1 <0.1 <0.1 <br /> 2496J3-GP180-15.0 8.0 15 3,600 <0.1 <0.1 <0.1 <0.1 <br /> 2496J3-GP183-12.0 Not observed 12 65 <br /> 249673-GP 185-]2.0 Not observed 12 150 <0.005 <0.005 <0.005 <br /> - <br /> *GPI 52 is the only boring in which visual contamination was discontinuous.Contamination was observed between 4.5' and 10', <br /> and again from 15.5'to the bottom of the borehole at 16'. <br /> A <br /> C CONDOR <br />