Laserfiche WebLink
ALCg-29-2008 10:39 AM CA In egrated Waste Management 916 3884 2/6 <br />y � <br />Mr_ Andrew Keller <br />August: 29; 2008 <br />Page 2 of 2 <br />4. Cinder the proposed workplan, what is the timeline by which the concentrations <br />of the methane gas in the perimeter monitoring probes are to be below the <br />regulatory threshold of 5%? 1f the methane gas levels in the probes are above 5%, <br />but the system shows a clear declining trend, the owner/operator can suggest a <br />concomitant timeline. If on the other hand, the concentrations of the methane gas, <br />in the probes remain Above 5%, and show no clear trend of decline, then., the <br />owner/operator has to suggest another timeline, that is considerate of the <br />circumstance. <br />5. Figure 3 in the submitted work plan shows the locations of the proposed <br />methane venting systems. The drawing does not indicate installation of any <br />methane venting systems in the area of the landfill where probes PGP -4 and <br />PGP -6 are located. What is the reason for omission of the methane venting <br />systems in the northern area of the site under one final closure plan? if the <br />Omission is on the basis of the non -detect ofinethme gas in PGP -4 and PCIP-6 in <br />the available records of the monitoring program, exten.siou of the control syste:ri <br />to the area will be required, if future monitoring indicates detection of meth.aize <br />gas in the two monitoring probes. <br />6. The Regional Water Quality Couti.ol Board (RWQCB) shall also be notified <br />regarding the proposal for the vent installation in. fill. <br />Thank for the submittal of the installation workplan. If you have further questions <br />.regarding the mimu.ents and/or questions, please contact me at (916) 341-6402 or <br />IVIr. Gino Yekta, of the Board's Closure and Technical Support Section, at (916) <br />341-6354. <br />Sincerely, y <br />Tadese Gebrehawariat <br />MSW Facilities Operations and Evaluation Branch <br />Compliance Evaluation and Enforcement Division <br />Cc: Ms. Mary Boyd, <br />Central 'Valley regional Water Quality Control Board <br />11020 Sun Center Drive, Suite 200 <br />Rmicho Cordova, CA 95670-6114 <br />Mr. Craig Mitchell, <br />San Joaquin Air Pollution Control District <br />4800 Enterprise Way <br />Modesto, CA 95356 <br />