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In <br />rj <br />OPau!N <br />� ,�•: COG <br />a' Za <br />FRITZ BUCHMAN <br />DEPUTY DIRECTOR <br />MICHAEL SELLING <br />DEPUTY DIRECTOR <br />THOMAS M. GAU <br />DIRECTOR <br />10 <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org/pubworks <br />ROGER JANES <br />BUSINESS ADMINISTRATOR <br />FlEcENED <br />October 23, 2012 <br />OCT <br />Mr. Robert McClellon, Program Coordinator <br />Environmental Health Department <br />1868 E Hazelton Ave <br />ITjS VICES <br />Stockton, California 95205 <br />SUBJECT: FOURTH QUARTER 2012 LANDFILL GAS MONITORING <br />AT THE HARNEY LANE <br />SANITARY LANDFILL <br />Dear Mr. McClellon: <br />Enclosed, please find the results of the fourth quarter perimeter migration monitoring at the Harney <br />Lane Sanitary Landfill, completed on October 17, 2012. <br />We are pleased to report that combustible gas concentrations at all monitoring locations at the Harney <br />Lane Sanitary Landfill were below regulatory limits at the time of monitoring. Measurements were <br />taken with the newly improved monitoring probes. <br />All perimeter migration monitoring probes were below the regulatory limit of 5%. The highest <br />concentration (1.4%) was found at probeGW-3-deep. We will pay close attention to this probe in the <br />future. <br />Structures were also found to be far below regulatory limits of 1.25%. We detected slight combustible <br />gas concentrations, not exceeding 0.2%, in the foundation of two of the structures we monitored. <br />Note that this detection was not in the structure itself, but in the rock beneath the foundation. <br />These measurements were made possible by the enhancement of the monitoring apparatus, similar to <br />the enhancements to the perimeter migration monitoring wells. I am not surprised to find a very slight <br />amount in the soil, and am pleased that we can now document, with confidence, the safety of those <br />dwellings. <br />If you have any questions, please contact me at extension 8-8504. <br />Sincerely, <br />WMD— f4t <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:kb <br />N:\1Harney Lane\LFG Migration Monit\Repts 2012\4th Qtr\RMcCIeIIon01-4thQ2012HL.doc <br />Enclosure <br />c: Kevin Taylor, California Department of Resources, Recycling, and Recovery <br />1001 "1" Street, Sacramento, California 95812-4025 <br />LA 11458A <br />