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P <br />Mr. Robert McClellon -2- <br />LANDFILL GAS MONITORING AND CONTROL PLAN <br />NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL <br />❑ Depth of shallow sampling interval is indicated. Proposed wells will have shallow <br />sampling intervals from five to ten feet from the surface. Previously installed wells <br />have sampling intervals that include sampling at a depth of ten feet; however, out of <br />concern for the potential for groundwater contamination, a slightly deeper sanitary <br />seal was installed at the two most recently installed wells (SG -9 and -10), causing <br />the shallow sampling interval of those wells to start at approximately 7'-6". <br />❑ Depth of intermediate probes are indicated, and include sampling intervals that are <br />at or within five feet of half the depth of the waste. <br />❑ Depth of deep probes are indicated, and are at or with five feet of the deepest waste <br />level, or deeper. <br />❑ All probes extend above the low seasonal water table. <br />If you have any questions, please contact Joyesh Chandra, Engineer II at (209) 468-3066 <br />or me at (209) 468-8504. <br />Sincerely, <br />zed <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:kb <br />N:\1 North County\Gas Monitoring\GasMonitPlanNforms\RMcCMiono3-NCGasPlan.doc <br />Attachment <br />c: (via email) Gino Yetka, Closure and Technical Services, CIWMB <br />Todd Del Frate, PG, Central Valley Regional Water Quality Control Board <br />LA 10631 <br />LA 63229 <br />