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AECOM Report on Soil Vapor Sampling and Human Health Risk Assessment 2-6
<br /> TO-15 Results for SV-1
<br /> October 20,2010,Event
<br /> ppbv 40 CHHSL ESL
<br /> Compound Detection Amount Detection Amount (PWm3) (Mtryt)
<br /> Lind Detected Limit Detected
<br /> Benzene 1.7 ND 5.6 ND 122 280
<br /> [36.2] [831
<br /> Toluene 1.7 ND 7.9 ND 378,000 180,000
<br /> [135,000] [63,000]
<br /> Ethylbenzene 1.7 ND 6.6 ND 1400 3,300
<br /> [420] [980]
<br /> M,p-Xylenes 1.7 ND 7.6 ND 887,000 58,000
<br /> [317,000] [21,000]
<br /> o-Xylenes 1.7 ND 7.6 ND 879,000 58,000
<br /> [315,000] [21,000]
<br /> Naphthalene 7.0 ND 36 ND 106 240
<br /> [31.9] [72]
<br /> TPHg 87 4,100 360 17,000 —' 29,000
<br /> [10,000]
<br /> ND=Not detected above detection limit.
<br /> 1 =There is no published CHHSL for TPHg.
<br /> AECOM also requested that the laboratory provide TIC concentrations for the top ten non-target
<br /> species.The analysis results are summarized in the following table.
<br /> TIC Results for SV-1
<br /> October 20,2010,Event
<br /> Compound Amount Detected' Compound Amount Detected'
<br /> (ppbv) (ppbv)
<br /> Pentane,2,4-dimethyl- 4 1-Propene, 1,1,2,3,3,3-hexafluoro- 4,500
<br /> Unknown 3,700 Unknown 46
<br /> Pentane,2,3,4-trimethyl- 200 2-Pentene,3-methyl-, (Z)- 120
<br /> Pentane,2,3,3-trimethyl- 580 Heptane,2,2,4,6,6-pentamethyi- 480
<br /> Heptane,2,2-dimethyl 44 Hexane, 1-(hexyloxy}2 methly- 48
<br /> 1 =Values are estimated,based on presumptive evidence.
<br /> Due to the disparity noted between the BTEX and naphthalene concentrations compared to the TPI-Ig
<br /> concentration in samples collected from SV-1 during previous sampling events (May 20 and
<br /> September 9, 2010), AECOM also requested that the laboratory run air-phase petroleum hydrocarbon
<br /> (APH)fractions analysis on the sample collected from SV-1.The APH analysis results are
<br /> summarized in the following table.
<br /> 60146 &M10 December 15,2010
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