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k <br /> CALCULATION OF GALLONS OF CONTAMINATION IN SPECIFIED VOLUME OF GROUNDWATER <br /> CLIENT The Southland Cog2rtation <br /> SITE 9110 Thornton Road, Stockton, CA <br /> 3 <br /> DATE 10/09/95 <br /> t G=(A-H)'N-(X/10"9)-7.481 <br /> INITIAL <br /> f Estimated initial dissolved mass of petroleum hydrocarbons based on 7117186 distribution. <br /> Reference Figure for area delineation. Area within 100.000 ppb contour estimated to average 150,000 ppb, <br /> within 10,000 contour estimated to average 30,00d'ppb, and within 1,000 contour estimated to average 3,000 ppb, <br /> CONTAMINANT TPH-G TPH-G TPH-G <br /> X-CONTAMINANT CONCENTRATION (ppb) 150000 30000 3,000 j <br /> N -POROSITY(0.##) = 0.4 0.4 0.4 <br /> A- IMPACTED AREA(ft"2) = 6784 9408 27072 <br /> H -HEIGHT OF IMPACTED AREA(ft) _ 5, 5 5 <br /> TOTAL <br /> TPH-G <br /> G-GALLONS OF CONTAMINANT = 1512 4.2 1.2 20.6 <br /> This value is just an estimate, actual value may range from 10 to 30 gallons. <br /> CURRENT <br /> Estimated current dissolved mass of petroleum:hydrocarbons based on 9/95 distribution. <br /> TPH-G not detected in any wells on site(<50 ppb),',so used estimate of 25 ppb TPH-G for wells which had <br /> detectable concentrations of benzene. Areas estimated based on 20 foot radius around MW-9 and 30 foot <br /> radius around MW-1. q <br /> CONTAMINANT TPH-G TPH-G <br /> X-CONTAMINANT CONCENTRATION (ppb) =1 25 25 <br /> N -POROSITY(0.##) = 0.4 0.4 <br /> A- IMPACTED AREA(11-2) = 1256 2826 0 <br /> s <br /> H-HEIGHT OF IMPACTED AREA(ft) = 10 10 <br /> TOTAL <br /> TPH-G <br /> G-GALLONS OF CONTAMINANT = 0.001 0.002 0.003 = 0.38 fluid ounces <br /> i' <br /> This value is just an estimate actual value rnay range from 0.001 to 0.004 gallons. <br /> (20.6120.603) = 99.99 % DISSOLVED PETROLEUM HYDROCARBONS REMOVED <br />• t <br /> s GwL�i)11`.An-R <br /> �_ TECHNOLOGY - <br />