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CAMBRIA <br /> Table 3. Soil Vapor Extraction Test Radius of Influence Data,Fortner Shell Service Station/Econo Gas, 880 Victor Road, Lodi, California <br /> Extraction Monitoring Rw r Pw(in WC) P(r)in WC Patin in WC Ri Screen <br /> Well Wells (ft) (ft) gauge absolute gauge absolute absolute (ft) Exposed(ft) <br /> SVE-1 Vacuum readings at observation wells collected at 12 44 October 7,2003 <br /> SVE-1 SVE-2 0 167 160 159 3909 05 4063 4068 186 15 <br /> SVE-1 SVE-3 0 167 420 159 3909 00 4068 4068 -- 15 <br /> SVE-2 Vacuum readings at observation wells collected at 9 40 October 9,2003 <br /> SVE-2 SVE-1 0 167 160 13 4 393 4 06 4062 4068 199 15 <br /> SVE-2 SVE-3 0 167 370 134 3934 00 4068 4068 -- 15 <br /> Based on the steady-state radial pressure distribution equation from"A Practical Approach to the Design,Operation,and Monitoring of In Situ Soil Venting Systems", <br /> P C Johnson,C C Stanley,M W Kemblowski,D L Byers,and J D Cothart,Groundwater Monitoring and Review Spring 1990 <br /> Rt=(Rw]/(r/Riv]^((1-(PatmVPw)^2J/(((P(r)/Pw)^2)-II] <br /> Note Vacuum influence was not detected in wells SVE-1 or SVE-2 when extracting soil vapors from SVE-3 <br /> Rw=Radius of Extraction Well(feet) <br /> r=Distance of monitoring well from extraction well(feet) Distances based on the site map and verified in the field <br /> Pw=Absolute pressure applied at extraction well(inches of water column) <br /> P(r)=Absolute pressure at monitoring well(inches of water column) <br /> Patm=Absolute atmospheric pressure(406 8 in WC) <br /> Ri=Radius of Influence(feet) <br /> 0955 Page ] of 1 <br />