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o.°'4uy O • <br /> 1•�� •,L <br /> Q: P.O.BOX 1810•1810 E.HAZELTON AVENUE <br /> THOMAS R.FLINN <br /> • DIRECTOR STOCKTON,CALIFORNIA 96201 <br /> (209)468-3000 FAX(209)468-2999 <br /> �44� 'oQ;;" www.co.san-joaquin.ca.us <br /> THOMAS M.GAU <br /> CHIEF DEPUTY DIRECTOR <br /> MANUEL SOLORIO worldg for YOU <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGER JANES <br /> BUSINESS ADMINISTRATOR May 25, 2007 <br /> Mr. Robert McClellon, Lead Senior R.E.H.S. <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> SUBJECT: REMEDIATION OF COMBUSTIBLE GAS MIGRATION <br /> HARNEY LANE SANITARY LANDFILL <br /> Dear Mr. McClellon: <br /> Enclosed please find our plan to control migration now indicated by the concentration of <br /> combustible gas at soil gas monitoring well GW-1. We have also sent this by email to facilitate <br /> transmission elsewhere, at your discretion. <br /> Information from our consultant, SCS Field Services, indicates that uneven settlement along the <br /> landfill supporting the northwest portion of the landfill gas header has reduced collection of LFG <br /> from that area, thus allowing migration at that one area. SCS believes that they have localized <br /> the problem to a 200-foot length of header, and we have directed them to proceed immediately <br /> with further investigation (if needed) and repair as soon as possible. <br /> In the meantime, we have asked SCS to monitor the foundation vents of the migrant housing <br /> structures weekly to ensure the safety of the occupants. Weekly monitoring will continue until <br /> the concentration of combustible gas at our monitoring wells is restored to below regulatory <br /> limits. Note that combustible gas has not been detected in these vents <br /> If you have any questions, please contact me at extension 8-3066. <br /> Sincerely, <br /> W. MICHAEL CARROLL, PE <br /> Senior Civil Engineer <br /> WMC:kb <br /> N:\1Harney Lane\LFG Other\HdrRemedPlan07\RMcClellon1-HdrRemed.doc <br /> Enclosure <br /> LA 11458 <br />