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n <br />ug! c <br />y: <br />THOMAS R. FLINN <br />DIRECTOR <br />c�likoR��p <br />THOMAS M. GAU <br />CHIEF DEPUTY DIRECTOR <br />MICHAEL SELLING <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGERJANES <br />BUSINESS ADMINISTRATOR <br />March 23, 2010 <br />Mr. Robert McClellon, Program Coordinator <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202 <br />11 <br />R O. BOX 1810 -1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgc)v.org/pubworks <br />SUBJECT: FIRST QUARTER 2010 PERIMETER AND STRUCTURE LFG MONITORING, <br />FOOTHILL SANITARY LANDFILL <br />Dear Mr. McClellon: ��P 1 <br />Attached please find the results of the perimeter migration on January 31, 2010, and on-site <br />structure monitoring on March 2, 2010, at our Foothill Sanitary Landfill. We are pleased to report <br />that based on these results, we are in full compliance with Title 27 regarding landfill gas <br />migration. <br />This was the first monitoring event for the new perimeter migration monitoring wells installed in <br />2009. To assess function, the vacuum required to withdraw a sample was measured while probe <br />gas was being collected. All but one probe required 5" we vacuum or less (most less than 2"). <br />Probe SG -118 -Shallow required 12" vacuum. I speculate that this is due to wet soil near the <br />surface at that well, which is installed near the pond. Our instrument can provide over 100" we <br />vacuum, but at no time did the instrument seem to "labor", indicating that the instrument did not <br />have difficulty pulling a sample from any probe. <br />Based on these measurements, all probes appear to be functioning properly. <br />If you have any questions, please contact me at extension 8-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:Ij <br />NA1 FoothiIALFGperimMonit\2010\1 Qtr\RMcCIeIIonLFG-1 stQ1 O.doc <br />Attachments <br />c: Keith Kennedy, California Department of Resources, Recycling, and Recovery <br />1001 "1" Street, Sacramento, California 95812-4025 <br />LA 31209 <br />