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' Date September 29,2003 <br /> Report Assessment 2003 <br /> I <br /> • Mass Remaining in Soil <br />' Assumptions Constants <br />' Impacted area=400 sf (UST complex) Bulk density of soil = 120 lbs/cf <br /> T 500 sf(dispenser islands) <br />' Impacted depth interval = 6 to 21 feet bgs <br /> Average TPHg concentration = 220 ppm <br />' Average MtBE concentration = 2 8 ppm <br />' Volume of impacted soil = 15ft* 900sf= 13,500 cf <br /> Mass of impacted soil = 13,500cf*120 lbs/cf= 1 62E6 lbs <br />' Mass of TPHg to soil = 1 62E6*2 2E-4 =72.7 lbs <br /> Mass of MtBE in soil = 1 62136*2 8E-6 =0.57 lbs <br />' Mass Remaining in Groundwater <br /> Assumptions Constants <br />' Impacted area = 8,000 square feet Specific Gravity of TPHg=0 90 <br />' Average plume depth =36 feet bgs Specific Gravity of MtBE= 0 74 <br /> Average depth to water= 21 feet bgs Density of Water= 8 43 lbs/gal <br />' Average plume thickness = 36-21 = 15 feet <br /> Porosity (silty sand) = 0 3 <br />' Average dissolved TPHg concentration = 100 ppb (by volume) <br /> Average dissolved MtBE concentration = 200 ppb (by volume) <br /> Impacted volume of water=8,000sf*15ft*0 3 =36,000 cubic feet(7 482cf/gal)=269,000 gallons <br />' Mass of dissolved TPHg= 269,000 gallons*lE-7*0 90*8 43 lbs/gallon = 0.20 lbs <br />' Mass of dissolved MtBE = 269,000 gallons*lE-7*0 74*8 43 lbs/gallon = 0.74 lbs <br /> 1 <br /> K\WprocessV5 BP ARCO\0602012003 Assessment16020 AssessmentASCM 2003 doc Page 1-1 <br />