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P4�IN <br />THOMAS R. FLINN <br />DIRECTOR <br />C )P <br />4�IFORN <br />THOMAS M. GAU <br />CHIEF DEPUTY DIRECTOR <br />MANUEL SOLORIO <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGER JANES <br />BUSINESS ADMINISTRATOR <br />Mr. Robert McClellon, REHS <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202 <br />May 22, 2008 <br />E <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org/pubworks <br />SUBJECT: LOCATION AND DESIGN OF LANDFILL GAS PERIMETER MIGRATION WELLS <br />AT THE NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL <br />Dear Mr. McClellon: <br />Attached are figures excerpted from the design drawings showing the location and construction of the perimeter <br />migration monitoring wells proposed for the North County Recycling Center and Sanitary Landfill. The design of <br />these wells is in conformance with revised Article 6 of Title 27 of the California Code of Regulations (CCR), as <br />follows: <br />• The new wells are located at or near the property boundary, providing a network surrounding the <br />disposal footprint but not in the refuse (Figure 1). <br />• The wells are spaced no more than 1,000 feet apart. <br />• The new wells will be triple -probe design (Sheet 3), drilled to an elevation equal to or deeper than the <br />proposed lowest elevation of the refuse at closure (35 Ft. NAVD 88). Five feet of bentonite seal is <br />provided over the upper sampling section, per your comments. <br />• The wells will be drilled by a licensed drilling contractor obtained by competitive bid. Wells will be logged <br />by an experienced soils technician under the supervision of a geologist or geotechnical engineer based <br />on the drill cuttings, and described using ASTM D2488-84 visual/manual procedure. <br />These wells will be installed as a component of landfill closure, and will be maintained through the postclosure <br />maintenance period. <br />If you have any questions, please contact Joyesh Chandra, Engineer II at (209) 468-3066 or me at (209) 468-8504. <br />Sincerely, <br />W. MICHAEL CARROLL, PE <br />Senior Civil Engineer <br />WMC:sc <br />NA21Periml-FGwells 08\RMcCIe11on04-NCperimWel1.doc <br />Attachment <br />c: (via email): Gino Yetka, Closure and Technical Services, CIWMB <br />Todd Del Frate, PG, Central Valley Regional Water Quality Control Board <br />LA 10631, LA 63108 <br />