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` • Attachment 3B • <br /> Petroleum Hydrocarbon Mass Dissolved in D Zone Groundwater <br /> Tesoro Sloemon Terminal <br /> Pon of Stockton <br /> Sloclnon,cerdomla <br /> Notes: <br /> (1) The initial area of the dissolved plume was based on a very conservative assumption of the maximum radius of influence of injection <br /> well TS/MW-3D. <br /> (2) Site sediments are composed primarily of clay and silt with some sand. Typical values for porosity in clay is 0.01 l0 0.20. Typical <br /> values for porosity in silt is 0.01 to 0.30. Typical values for porosity in fine sand is 0.10 to 0.30. The ASTM RBCA Standard(ASTM, <br /> 1995)includes a default value of 0.38(to be used primarily for unconsolidated sediments). To provide a conservative estimate,a <br /> porosity value of 0.30 was used in the calculations below. <br /> (3) The height of the water column was calculated based on a very conservative assumption of the maximum radius of influence of <br /> injection well TSIMW-3D. <br /> (4) When analyte was below method reporting limits(MRL),the MRL was used as the concentration, <br /> (5) A very conservative estimate of the mass was calculated using the first quarter 2009 concentrations from well TSIMW-3D. Other <br /> concentrations were provided for comparison. <br /> Groundwater Concentrations <br /> TPHg TPHd eenxena Toluene Ethylbenxene xylenes MTBE <br /> (4 92) WIL) (49ti) (4g/L) (49/0 (4g/L) (4910 <br /> 4 0.1 37 e8 <br /> T9/MW-2D 11N71o8 4,so 1400 2•` <0.70 23 14 <br /> TS/MW-2D 02104x79 9D 7 1700 120 11 <0.50 2.9 22 <br /> TS/MW-3D 11107M380 3B0 140 1.1 <br /> TSIMW3p 0240V09 9700 <2000 4,600 ]s <br /> 6.6 20 <br /> Radius of Plume= 40 ft <br /> Density TPHg 6.1 Ibslgallon <br /> ft2 Benzene 7.34 Ibslgallon <br /> Area of Plume= 5026.55 <br /> Toluene 7.2 Ibslgallon <br /> Ethylbenzene 7.2 Ibslgallon <br /> Xylenes 7.2 lbs/gallon <br /> MTBE 6.18 Ibs/gallon <br /> TPHd 7.1 lbs/gallon <br /> P=A(ft2)x H(ft)x N x(7.481 gallons/ft')x (3.786 liters/gallon)x(X mgll)x(Ibf453,592 mg) <br /> CONTAMINANT TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd <br /> X-CONTAMINANT CONCENTRATION(mg/L) = 8.700 4.600 0.036 0.006 0.064 0.020 2000. <br /> N-POROSITY = 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <br /> A•IMPACTED AREA(ft-2) = 5,027 5,027 5,027 5,027 5,027 5,027 5,027 <br /> H-HEIGHT OF IMPACTED AREA(ft) = 20 20 20 20 20 20 20 <br /> V-VOLUME OF IMPACTED AREA(ft-3) = 100,531 100,531 100,531 100,531 100,531 100,531 100,531 <br /> P-POUNDS OF CONTAMINANT(Ibs) = 16.381 8.661 0.068 0.010 0.121 0.038 3.766 <br /> (gallons) 2.685 1.180 0.009 0.001 0.017 0.006 0.530 <br /> Initial Estimated Total Mass of Dissolved Hydrocarbons: 29.045 pounds <br /> Initial Estimated Volume of Dissolved Hydrocarbons: 4.430 gallons <br /> Pees+a <br /> 1:451TGslacpon\TeHenUlOee CeblTHaro Ta miN 60 OW Mean Gslca 20a9na <br />