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PO.P <br /> 2: y <br /> h. THOMAS R. FLINN P.O.BOX 1810-1810 E. HAZELTON AVENUE <br /> STOCKTON,CALIFORNIA 95201-3018 <br /> DIRECTOR (} (209)468-3000 FAX(209)468-2999 <br /> www.co.san-joaquin.ca.us <br /> THOMAS M.GAU /1 <br /> DEPUTY DIRECTOR _ <br /> MANUEL SOLORIO Wcwking for YOU <br /> DEPUTY DIRECTOR IR EDD <br /> STEVEN WINKLERL� <br /> DEPUTY DIRECTOR <br /> May 12,2004 <br /> BENTON ANGOVE MAY 1 4 2004 <br /> BUSINESS ADMINISTRATOR <br /> TVVIRONMEN 1 HEALTH <br /> Mr. Robert McClellon, RENS P R1011'1SERt�ICES <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> SUBJECT: SECOND QUARTER 2004 PERRAETER AND STRUCTURE LFG <br /> MONITORING, FOOTHILL SANITARY LANDFILL <br /> Dear Mr.McClellon: <br /> This is notification in accordance with Title 27 CCR, Section 20934 (a) (2)and(4),that combustible gas <br /> concentration of 7.1%was detected at soil gas well SG-11 at Foothill Sanitary Landfill on Thursday, <br /> May 6, 2004(Figure and monitoring data attached). <br /> There has been no change in the operation of the landfill that would cause this detection. It is also unclear <br /> why we do not detect combustible gas at SG-1,which is closer to the landfill, although sampling from a <br /> lower depth. <br /> Because the distance from SG-11 to the property boundary is great(approximately 1400 feet), combustible <br /> gas was not detected in any other soil gas probes or in occupied structures,and property immediately <br /> adjacent to the Foothill Landfill is open grazing land, we do not believe that any immediate corrective <br /> action is needed to protect human health and safety. To demonstrate that combustible gas is not leaving <br /> our property,we are planning to install a triple-probe well near the western property boundary, and <br /> re-establishing our monitoring perimeter accordingly. You are also aware of the County's commitment to <br /> install a landfill gas collection system at this site in 2006. Once operating, this system should remove any <br /> potential for migration. <br /> If you have any questions, please call me at extension 8-3066. <br /> Sincerely, <br /> W. MICHAEL CARROLL,PE <br /> Senior Civil Engineer <br /> WMC:sc <br /> N:\IFoothill\LFCrperimMonit\2004\RMcCiellonLFG-2ndQO4.doc <br /> Attachment <br /> c: Gino Yekta,Califomia Integrated Waste Management Board <br /> 1001 "I" Street, Sacramento, California 95812-4025 <br /> LA 31209 <br />