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CAMBRIA <br /> Table 4. Interim Remediation-Vacuum Radius of Influence Data - Shell-branded Service Station, 6131 Pacific Avenue, Stockton, California <br /> Extraction Observation Rw r PW Pw(abs) P(r) P(r) Ri Pr/PW Z <br /> Well Well (ft) (ft) (tnWC au e inWC absolute <br /> ( ) (tnWC au e) (mWC absolute) <br /> VE W-2 <br /> 6/22/048 15 VEW-1 0 167 25 182 3886 1 1 4057 348 60% <br /> 6/23/04900 MW-5 0 083 45 158 3910 01 4067 NC 06% <br /> VEW-1 <br /> 6/25/04730 VEW-2 0167 25 1090 2978 63 4005 357 58% <br /> 'Based on the steady-state radial pressure distnbution 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 Kemblowsla,D L Byers and i D Cothart,Groundwater Monitoring and Review,Spring 1990 <br /> I <br /> Ri=(Rw]/(r/Rwr[(1-(ParnVPwp`2YWP(r)/Pwr2)-1)f <br /> Ratio of monitoring well gauge pressure to extraction well gauge pressure <br /> Rw=Radius of Extraction Well(feet) <br /> r=Distance of monitoring well from a straction well(feet) <br /> Pw=Absolute pressure applied at extraction well(inches of water column) <br /> P(r)=Absoiutc pressure at monitoring well(inches of water column) <br /> Ri=Radius of Influence(feet) <br /> NC=Not calculated because IWPW is less than I% <br /> ft=feet <br /> inWC=inches of water column vacuum <br /> 0854 Page 1 of 1 <br />