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The following figure illustrates the boundary flow conditions for the steady-state radial air <br />flow equation, Patn, and Rlatn, r and the boundary conditions for steady-state LFG radial flow <br />to the collection well, PL and RILFG . <br />EXTRACTION <br />WELL P atm <br />ZONE OF AIR <br />;�— INTRUSION E <br />Pw <br />NO AIR <br />INTRUSION <br />RILFG <br />111 <br />PL <br />Substituting the LFG radial flow boundary conditions into equation (2) results in a steady- <br />state radial LFG flow equation: <br />Q = H 'TrK Pw I — (pLFG / Pw )2 l Equation (4) <br />,u In (R W / RI LFG 1 <br />Where: <br />Q= Volumetric flow rate from the collection well (cm3/s) <br />H = Length of well screen (cm) <br />p = Absolute viscosity (g/cm-s) <br />k = Gas Permeability (cm') <br />PLFG = Absolute Internal LFG pressure = (Patin + PL) (9/CM-S') <br />PW = Absolute Pressure applied at the collection well (g/cm-s') <br />RILFG = Radius of influence of the LFG collection well (cm) <br />Rw = Radius of the gas collection well (cm) <br />7 <br />Installation Work Plan to Remediate Landfill Gas Migration <br />J:\Allied\Forward\Workplan\Forward Evaluation - rev4.doc:9/15/2004 <br />