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A r <br /> Op4U!N' C • <br /> Q Z+ P.O. BOX 1810-1810 E.HAZELTON AVENUE <br /> a THOMAS R. FLINN STOCKTON,CALIFORNIA 95201-3018 <br /> DIRECTOR (209)468-3000 FAX(209)468-2999 <br /> c't;FORa`" www.co.san-joaquin.ca.us <br /> THOMAS M.GAU <br /> DEPUTY DIRECTOR s' <br /> MANUELSOLORIO for YOU <br /> [NECEI�1VE `J <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER JUL 0 12004 <br /> DEPUTY DIRECTOR <br /> BENTON ANGOVE June 25, 2004 ENVIRONMENT HEALTH <br /> BUSINESS ADMINISTRATOR <br /> PERMIT/SERVICES <br /> MEMORANDUM <br /> TO: b Robert McClellon, Lead Senior R.E.H.S. <br /> (,p Environmental Health Department <br /> FROM: W. Michael Carroll,PE <br /> Senior Civil Engineer ; I <br /> SUBJECT: DETECTION OF COMBUSTIBLE GAS ABOVE REGULATORY LIMIT,HARNEY <br /> LANE SANITARY LANDFILL <br /> This is to inform you that two of the probes of perimeter monitoring well GW-1 were found to have <br /> combustible gas concentration over the regulatory limit of 5%. The shallow probe was found to have <br /> combustible gas concentration of 6.5%,and the intermediate probe was found to have combustible gas <br /> concentration of 8.5%. These detections were made on June 17,2004. We were informed of this on <br /> June 18,2004. <br /> We do not believe that any immediate action need be taken to protect human health and safety. The <br /> buildings adjacent to the landfill in that area were monitored along with the perimeter probes, and no <br /> combustible gas was detected at the buildings. <br /> We believe that the problem has occurred due to obstruction of the LFG collection system in the vicinity of <br /> that probe, caused by settlement of the landfill surface which results in low spots along the LFG header. I <br /> believe your office is aware of recent repair to portions of this header. Apparently, low spots have developed <br /> beyond this repair area. <br /> Corrective action has begun,with the determination of where the low spots may have occurred. We believe <br /> we have identified one,perhaps two problem areas,which we are now mobilizing to correct. <br /> This memo is transmitted in accordance with Title 27 CCR Sections 20937 (a)2 and 4. <br /> If you have any questions,please contact me at extension 8-3066. <br /> WMC:mr <br /> WlHamey Lane\LFG MonitData\2004\RMcClellon01-Wel1GWl.doc <br /> Enclosure <br /> c: Gino Yekta <br /> California Integrated Waste Management Board <br /> CAL-EPA Building <br /> 1001 "I" Street <br /> Sacramento, California 95812-4025 <br /> LA 11458 <br />