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Mr. Robert McClellon -2- <br />DESIGN OF LANDFILL GAS PERIMETER MIGRATION WELLS <br />AT THE NORTH COUNTY AND FOOTHILL SANITARY LANDFILLS <br />Extending the monitoring length below that point will also increase our ability to detect LFG <br />migrating below that elevation. Generally, I believe that a deeper well will provide better monitoring <br />This design also maximizes the probability that the sample collected is fully representative. <br />Further, this design provides maximum protection against blockage of the probe by water intrusion. <br />The framers of the original regulation (adapted for this new regulation) may have envisioned a <br />single sampling point located at the bottom of the well. If so, they apparently did not foresee that <br />such a design would be quite vulnerable to submergence, as we now know. <br />Both SCS and Shaw use a design in which the perforated pipe extends through the length of the <br />rock section for the above reason. <br />I look forward to receiving your comments on this design. We are moving quickly with the bid <br />package, and would greatly appreciate a prompt response. <br />If you have any questions, please contact me at (209) 468-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:kb <br />NA2PerimLFGwells 08\RMcCIe11on02-WeI1Design.doc <br />Attachment <br />c: (via email): Gino Yekta and Michael Wochnick, Closure and Technical Services, CIWMB <br />LA 10631 <br />