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1 <br /> CONTAMINANT MASS CALCULATIONS <br /> RESIDUAL SOIL AND GROUNDWATER CONTAMINATION <br /> 212 Industrial Drive, <br /> Stockton, CA <br />' CONTAMINANT MASS CALCULATIONS <br /> Wilbur Ellis <br /> Mass in soil <br /> Based on estimated extent shown on attached figures <br /> Mass= (Volume of impacted zone)(soil density)(Average Concentration)(E-6) <br /> Volume (cu ft) =Area (sq ft) x Thickness (ft ) <br /> Soil density assumed 100lb1cu ft <br /> Average concentration derived from all positive results within or bordering zone <br /> Benzene <br /> A1'eaf Volume-9 3 3A��e m If�as�� � t <br /> Depth Intetial <'C'60�t �a>iC>�a t�orttaminatft�il <br /> I <br /> 5-15' De th 380 3800 025 01 <br /> 15-25' De th 1900 19000 151 29 <br /> 25-40' Depth 3500 52500 056 29 <br /> Total mass of benzene in Sod = 59 <br /> Avera a Concentration of benzene in Soil m = 081, <br /> TPH <br /> Depth Interval Area 11oictlnne C�� plass of <br /> s (M ft.) (i Contaminant(4116 <br /> 5-15' De th 380 3800 49 18 6 <br /> 15-25' Depth 1900 19000 52 98 8 <br /> 25-40' Depth 3500 52500 13 68 3 <br /> Total mass of TPHg in Soil - 1857 4 <br /> Avera a Concentration of TPH in Soil m Ik 24 7 <br /> Mass in groundwater <br /> Based on estimated extent shown on attached figures <br /> Concentrations are average of last 3 sampling events for wells MW1 and MW3 <br /> Volume (cu ft ) =Area x 30' x 35% <br /> Mass = volume x 62 4 (lbs/cu ft) x concentration x 10-9 <br /> Aquifer Thickness= 30 feet, porosity = 0 35 <br /> Average <br /> Contaminant Area Water Volume Concentration Mass of <br /> (sq ft) (cu.ft ) (Ppb) Contaminant(lbs) <br /> TPH 18,000 189000 58 068 <br /> Benzene 18,0001 1890001 581 06811 <br /> 1 <br /> 1 <br />