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Mr. Robert McClellon Page 2 <br /> THIRD QUARTER 2013 LANDFILL GAS MONITORING DATA AND REMEDIATION PLAN AT <br /> THE HARNEY LANE SANITARY LANDFILL <br /> Our most recent monitoring of the LFG collection system wells indicated negative pressure at all <br /> wells as is required by our Air Quality Management Permit,thus landfill gas was being collected <br /> from these areas of the landfill. However, there were indications that settlement of the landfill gas <br /> pipes (caused by the settlement of the landfill itself)was beginning to cause accumulation of <br /> landfill gas condensate within the pipes. Such accumulation would gradually obstruct the flow of <br /> landfill gas from the wells. We began investigating this issue at the start of the fiscal year when <br /> funds became available, and believe we have identified the problem areas. In addition, we <br /> discovered a malfunctioning pump, which has been replaced. <br /> Differential settlement of the landfill gas header is a problem which we continue to address. We <br /> have adjusted and reset significant portions of the LFG header in recent years (Figure 1). <br /> Steps taken prior to those identified in the Remediation Plan include installing a temporary pump <br /> in the condensate sump CS-4 to remove landfill gas condensate and adjusting the wells in the <br /> area that is affected. <br /> Remediation Plan (in accordance with Section 20937 (a) (3)) <br /> Corrective actions to be taken to address this issue include: <br /> • Replacing the temporary condensate sump pump with a permanent pump <br /> * Re-setting the portions of the LFG header at which landfill settlement has caused <br /> accumulation of condensate and obstruction of the flow of landfill gas <br /> Re-setting the LFG header will require 60 days to complete. Work to determine the problem <br /> areas began in July of this year. <br /> We have full confidence that migration control can be restored, bringing soil gas concentrations <br /> back into compliance. <br /> If you have any questions, please contact me at extension 8-8504. <br /> Sincerely, <br /> W. MICHAEL CARROLL, PE <br /> Senior Civil Engineer <br /> WMC.sn <br /> NA1 Harney Lane\LFG Migration Monit\Repts 2013\3rd Qtr\RMcC1e11on01-LFGContro1.doc <br /> Enclosures <br /> c: Kevin Taylor, California Department of Resources, Recycling, and Recovery <br /> 1001 "1" Street, Sacramento, California 95812-4025 <br /> LA 11458A <br />