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Mr. Robert McClellon -2- <br />REVISION TO LFG MIGRATION MONITORING PLAN FOR IMPROVEMENT OF PERIMETER <br />MONITORING AT SAN JOAQUIN COUNTY -OWNED LANDFILLS <br />Sampling valves will be identical for all perimeter monitoring probes (including those few that now <br />have tube connections) and will use the same color code (red -blue -yellow) to indicate probe depth. <br />The information now provided at the wells will be revised to indicate the revised color code. <br />We believe this to be a significant improvement to the perimeter monitoring at all our sites. We will <br />proceed with this installation upon your approval. <br />With your approval and after the work is complete, we will insert this information into each of our <br />LFG migration monitoring plans as an addendum. <br />Please contact me at (209) 468-8504 with any questions. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:Ij <br />N:\2ModifyPerim Probes2011 \WcCIellon01-Probel mp.docx <br />LA 11458A <br />LA 21123 <br />LA 31103E <br />LA 63108 <br />