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Attachment 3A <br /> Petroleum Hydrocarbon Mass Dissolved In D Zone Groundwater <br /> Tesoro Stockton Terminal <br /> Pon of Stockton <br /> Stockton.California <br /> Notes: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 Gay and sift with some sand. Typical values for porosity in clay is 0.01 to 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 primadly 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 TS/MW-30. <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 TS/MW-3D. Other <br /> concentrations were provided for comparison. <br /> Groundwater Concentrations <br /> TPH9 TPHd Benzene Toluene Ethylbenzene xylenes MTBE <br /> WOIL) WVL) WILL) (PBIL) (PH(L) (P91L) (OWL) <br /> TS/MW-20 11107M 4,900 1400 2,500 14 9.1 37 9.e <br /> TS/MW-2D 02/04/05 790 1]00 120 1.1 X070 23 14 <br /> TS/MW-3D 11/07/09 360 390t40 1.1 W.50 2.9 2.2 <br /> TS/MW-3D 02/04/06 9,700 ;000 4,600 36 6.6 g4 20 <br /> Radius of Plume= 20 0 Density TPHg 6,1 lbs/gallon <br /> Area of Plume= 1256.64 h7 Benzene 7.34 lbs/gallon <br /> Toluene 7.2 lbs/gallon <br /> Ethylbenzene 7.2 lbs/gallon <br /> Xylenes 7.2 lbs/gallon <br /> MTBE 6.18 lbs/gallon <br /> TPHd 7.1 lbs/gallon <br /> P-A(ft')x H(ft)x N x(7.481 gallons/ft)x (3.785 liters/gallon)x(X mgll)x(tb/453,592 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 2.000 <br /> N.POROSITY = 0.3 0.3 0.3 0.3 0.3 0.3 0.3 <br /> A-IMPACTED AREA(W2) = 1,257 1,257 1,257 1,257 1,257 1,257 1,257 <br /> H-HEIGHT OF IMPACTED AREA(11) = 15 15 15 15 15 15 15 <br /> V-VOLUME OF IMPACTED AREA(W3) = 18.850 18.850 18,850 18,850 18,850 18,850 18,850 <br /> P-POUNDS OF CONTAMINANT(lbs) = 3.071 1.624 0.013 0.002 0.023 0.007 0.706 <br /> (gallons) 0.504 0.221 0.002 0.000 0.003 0.001 0.099 <br /> Initial Estimated Total Mass of Dissolved Hydrocarbons: 5.446 pounds <br /> Initial Estimated Volume of Dissolved Hydrocarbons: 0.831 gallons <br /> rk ucstmwwe swan calwres ore—W amt cw meu oke 2009..is P"101 <br />