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PAWN <br />y THOMAS R. FLINN <br />DIRECTOR n <br />4[(FonN <br />THOMAS M. GAU <br />DEPUTY DIRECTOR JAIU <br />MANUEL SOLORIO �•'�� �ct r 1 i +� <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGER JANES <br />BUSINESS ADMINISTRATOR <br />Mr. Robert McClellon, REHS <br />Environmental Health Department <br />304 East Weber Avenue, Third Floor <br />Stockton, California 95202 <br />July 6, 2006 <br />0, <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201-3018 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org <br />SUBJECT: DETECTION OF COMBUSTIBLE GAS IN EXCESS OF REGULATORY LIMIT, <br />FOOTHILL SANITARY LANDFILL <br />Dear Mr. McClellon: <br />As noted in the inspection report dated June 22, 2006, combustible gas was found to be 6.0% at perimeter <br />monitoring well SG -4 at the Foothill Sanitary Landfill. This concentration is 1% above the regulatory limit <br />of 5%. Please note that all on-site structures were found free of combustible gas. <br />The closest habitable structure to this well is the on-site residence, which is over 2,500 feet from this well, <br />and which was found to be free of combustible gas in this and all previous monitoring events. Well SG -4 is <br />also over 1,000 feet from the property boundary, with no structures visible for at least two miles in that <br />direction. Therefore, we do not believe this condition threatens human health and safety at this time. <br />In conformance to California Code of Regulations (CCR) Section 20919.5 c (2), we have placed this <br />information in the operating record. <br />In conformance CCR Section 20919.5 c (3), we have implemented remediation of the situation with the <br />design of a landfill gas collection system, which will be installed as a component of the Foothill Sanitary <br />Landfill Site Improvement Project by December 2006. Please consider this letter, and the plans and <br />specification for this project (submitted earlier), to be the Implementation Plan required by this Section. <br />If you have any questions, please call me at 468-8504. <br />Sincerely, <br />WI-rX aJ� <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:kb <br />NMFoothi1I\LFG Monitoring\LFGperimMonit\2006\RMcClellon01-SG4.doc <br />c: Mr. Keith Kennedy, California Integrated Waste Management Board <br />1001 "I" Street, Sacramento, California 95812-4025 <br />LA 31209 <br />