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THOMAS R. FLINN DIRECTOR w", THOMAS THOMAS M. GAU CHIEF DEPUTY DIRECTOR MANUEL SOLORIO DEPUTY DIRECTOR STEVEN WINKLER DEPUTY DIRECTOR ROGER JANES BUSINESS ADMINISTRATOR Mr. Robert McClellon, REHS Environmental Health Department 600 East Main Street Stockton, California 95202 September 15, 2008 • P. O. BOX 1810 - 1810 E. HAZELTON AVENUE STOCKTON, CALIFORNIA 95201 (209) 468-3000 FAX (209) 468-2999 www.sjgov.org/pubworks SUBJECT: LANDFILL GAS MONITORING PLAN, FOOTHILL SANITARY LANDFILL Dear Mr. McClellon:�b Enclosed, please find the Landfill Gas Monitoring Plan for Foothill Sanitary Landfill, describing the landfill gas (LFG) migration monitoring wells proposed in accordance with California Code of Regulations (CCR) Section 20925 et seq., which became effective August 21, 2007. This plan summarizes and confirms the location, depth, and design of the LFG migration monitoring wells submitted earlier this year. The design is based on the final design refuse depth elevation of 180 ft. MSL. Following are the points of the Plan Elements Guidance Checklist promulgated by the California Integrated Waste Management Board staff, for your information: ❑ The Plan was designed by registered engineer (signed and stamped). ❑ The wells are not in the waste. ❑ The wells are at or near the property boundary. In most cases, the wells are within a few feet of the property boundary. ❑ Spacing of wells provides no more than 1,000 feet separation. ❑ The monitoring perimeter has been established to exclude the pond at the southeast corner of our property at this time, such that the pond is considered "off site" with regard to subsurface LFG migration monitoring. This adjustment is made due to the difficulty in access in wet weather to that corner of the property for monitoring and maintenance of those wells. ❑ All well depths are indicated. Proposed wells will be drilled at or near an elevation level of the deepest level of waste at the completion of the landfill (180 msl), or deeper. Existing monitoring well SG -12 was installed in accordance with the regulations in force at the time of installation (June 2004), which required a drill depth to the refuse within 1,000 feet of the well. The design refuse depth elevation within 1000 feet of this well is 222 ft.