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CORNERSTONE <br />OrEnvironmental Groa <br />7600 Dublin Boulevard, Suite 200 • Dublin, CA 94568 • (877) 633-5520 • Fax: (925) 560-9879 <br />March 7, 2011 <br />Mr. Robert McClellon <br />Program Coordinator <br />San Joaquin County <br />Environmental Health Department <br />600 East Main Street <br />Stockton, CA 95202 <br />(559) 230-6000 <br />Re: Addendum to the Previously Approved Title 27 Perimeter Probe Monitoring <br />Network Work Plan for the Southwest Expansion Area, Forward Landfill <br />Manteca, CA (SWIS Facility No. 39 -AA -0015) <br />Dear Mr. McClellon: <br />Cornerstone Environmental Group, LLC (Cornerstone), on behalf of Forward Landfill, Inc., <br />owner and operator of the Forward Landfill (Landfill), is submitting this assessment of the <br />proposed landfill gas (LFG) monitoring probe setback as part of the environmental study for <br />the proposed Landfill expansion being prepared by others in support of the California <br />Environmental Quality Act (CEQA) process for the expansion permit. This assessment is in <br />response to the September 10, 2010 County of San Joaquin Environmental Health <br />Department (EHD) "Conditions for Approval" item No. 3, provided below. <br />September 10, 2010 Environmental Health Department (EHD) "Conditions for Approval" <br />item No. 3 — The facility management is planning an expansion of the landfill. The planned <br />expansion is in the same area now being proposed as the buffer area. The environmental <br />study to allow the expansion must address to site geophysical conditions as it pertains to gas <br />migration. The study shall assess whether a 100 foot minimum setback, from waste to the <br />perimeter monitoring probes, is adequate. The report must be completed by a Registered <br />Geologist or Engineering Geologist familiar with landfill gas. <br />Assessment by Cornerstone <br />Introduction <br />Forward Landfill, Inc. has proposed to expand the Landfill south and west of the existing <br />landfill footprint. The expansion project will be located adjacent to the current filling area. <br />The design and specifications of the new landfill cell are in accordance with United States <br />