Laserfiche WebLink
I <br /> R 15 June 2009 <br /> . AGE-NC Project No.05-1306 <br /> Page 28 of 33 <br /> I Table 3.The resulting vapor pressures for petroleum residual in MW-3 and MW-4 are 0.013 mmHg <br /> and 0.010 mm Hg,respectively. These values were compared to the vapor pressure of diesel fuel of <br /> 1 - - 0.400 mm Hg. The weathered material remaining in the ground water has a vapor pressure 40 times <br /> lower than fresh diesel fuel. <br /> In conclusion, the vapor pressure of the remaining low Ievels of weathered petroleum are too low <br /> to pose a threat to human health. Further to the matter, given the reduced volatility and vapor <br /> pressure of this residual, soil gas testing does not appear to be an appropriate or necessary measure <br /> required to be taken to protect current or future usages of the property. <br /> TABLE 8-1 <br /> 6.� PROPERTIES OF TPH BOILING FRACTIONS <br /> k Constituent Molecular Weights Solubility Vapor Pressure H <br /> (g/mole (mg/L) (mm HG <br /> C10-C12 Aliphatic 160 0.034 0.48 120 <br /> f <br /> 1 C12-C16 Aliphatic 200 0.00076 0.036 520 <br /> i <br /> C16-C35 Aliphatic 270 0.0000025 " 0.00084 4,900 <br /> C10-C12 Aromatic 130 25 0.48 0.14 <br /> C72-C16 Aromatic 150 5.8 0.036 0.053 <br /> C16-C27 Aromatic 190 0.65 0.00084 0.013 <br /> 4 C2t-C35 Aromatic 240 0.00066 0.00000033 0.00067 <br /> j Notes: <br /> f g/mole: grams per mole <br /> mg/L: milligrams per liter <br /> mm HG: millimeters of mercury <br /> Source: TNRCC,"Development of Human Health PCLs for Total Petroleum Hydrocarbon Mixtures,"RG-66/TRRP-27,June,2000 <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br /> t � <br />