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(-7T t. t. [ r-7 <br /> Lam; i.- C-7 r�" <br /> f <br /> Table 3: Contaminant Mass Estimate Calculations(TPH-G) <br /> City of Escalon-Former Arco Mini Mart <br /> 1305 Escalon Avenue <br /> Project No.750.2 <br /> matrix area* volume density** conv. cont.load conv. cont. <br /> zone type depth-ft thickness (ft.) ft3 Ibslft3 lbs/kg mg/kg mg/kg kg <br /> #1 sand&silt 0-25 25 3407 77885 110 0.4536 1,154 0.000001 4485 <br /> #2 sand&silt 25-50 25 2248 56200 110 0.4536 1.333 0.000001 3.7 <br /> #3 sand 50-65 15 2958 44370 120 0.4536 0.5 0.000001 1.2 <br /> matrix area* volume vol of H2O*** vol H2O cont.load**** cont.load cont. <br /> zone type depth-ft thickness (ft.) ft3 ft3 liters mg/L kg/L kg <br /> water 62-89 27 4896 132192 46267 1310139 1.705 0.000001705 2.23 <br /> total kg= 4491.80 <br /> Ib= 9904.41 <br /> gal= 1597.49 <br /> Notes: <br /> *=Area calculated by CAD software. Excavation volume of 270 cubic yards of soil subtracted from Zone 1. <br /> "=estimated from Watson and Burnett, 1995 <br /> Vol. H2O=volume of zone x porosity(30%) <br /> ****average zone concentration <br /> §eo(agrcalleJinicslnc <br /> 1/21/03 <br />