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1 <br /> ' APPENDIX E <br /> CHAPIN BROTHERS INVESTMENTS,INC. <br /> ' 1766 Monte Diablo Avenue, Stockton, California <br /> ' Calculation of Expressed Assimilative Capacity <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 <br /> acceptor <br /> • The utilization factors 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 /> 1 <br /> EAC=0 31(Ob - Om)+0 21(Nb-Nm)+ 0 06(Mgm -Mgb)+ 0 05(Fem -Feb) <br /> ' + 0 21(Sb-Sm)+ 128 (Mm-Mb) <br /> O - Oxygen <br /> N-Nitrate <br /> ' Mg-Manganese <br /> Fe-Ferrous Iron <br /> S - Sulfate <br /> ' M-Methane <br /> ND -non detected <br /> NA -not analyzed <br /> ' For the Third Quarter 2005,values were taken from background wells MW-2 and MW-3 and from <br /> maximum concentration wells EW-3 and VE-1 <br /> ' EAC=0 32 EW3-MW2 +0 21 W3-VE1 0 06 EW3-MW2 +0 05 -ND <br /> ' +0 21(MW2-EW3)+l 28(NA-NA) <br /> ' EAC=0 32(6 62-3 09)+0 21(2 2-14)+0 06(5 2-1 1)+0 05(0-0)+0 21(240-160)+1 28(0-0) <br /> EAC = 18 3 mgll <br /> 1 <br /> 1 <br />