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1 " Y <br /> Ground Water Expressed Assimilative Capacity <br /> Former CURTISS PONTIAC-BUICK <br /> 2450 Toste Road, Tracy, California <br /> Assumptions: <br /> • The Expressed Assimilative Capacity (EAC) was calculated using the difference in <br /> concentration between values in a background well and values in a well within the highest <br /> area of dissolved BTEX distribution. <br /> • The EAC approximately equals the equivalent dissolved BTEX biodegradation. The EAC <br /> assumes the degradation of the BTEX once the contaminant is in contact with the electron I <br /> acceptor. <br /> z <br /> • The utilization factor is the ratio of the mass of biodegrading contaminant to the mass of <br /> electron acceptor utilized(metabolic byproduct production). <br /> The EAC calculation is typically show as follows: <br /> EAC=0.32(06 -Ora) +0.21(Nb N„J +0.06(Mnm -Mnb) +0.05(Fem-Feb) <br /> +0.21(Sb-S,n) + 1.28(Mm Mb) <br /> Concentration of Geochemical Parameters(mg/1) <br /> Geochemical Utilization Equivalent BTEX <br /> Parameter Factor Background Zone of Mighe t BTEX Difference Degradation 's <br /> MW-5 ) <br /> O 0.32 1.06 0.29 0.77 0.2464 <br /> I <br /> ` N 0.21 16 9.5 6.5 1.365 <br /> Mn 0.06 0.023 0.11 0.087 0.0052 <br /> Fe 0.05 <0.020 <0.020 - 0 <br /> S 0.21 580- 510 70 14.7 <br /> M 1.28 <0.0005 0.0018 0.0018 0.002304 <br /> Total Expressed Assimilative Capacity(mg/1) 16.3189 { <br /> O-Oxygen Fe-Ferrous Iron <br /> N-Nitrate S-Sulfate <br /> Mn-Manganese M-Methane <br /> EAC= 0.32(1.06 - 0.29) + 0.21(16 - 9.5) + 0.06(0.11 - 0.023) + 0.05(0) + 0.21(580 - 510) + <br /> 1.28(0.00018-0) <br /> EAC= 16.32 mg/1 <br /> ij <br /> I <br /> Advanced GeoEnvironmental,Inc. +' <br /> i <br /> i <br />