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C7 SAN OAQUIN --. COUNTY _-- Greatness grows here Wa&bs for YOU March 15, 2017 Marty Hartzell, PG, CHG Senior Engineering Geologist Central Velley Regional Water Quality Control Board 11020 Sun Center Drive, Suite 200 Rancho Cordova, CA 95670-6114 C: Department of Public Works Kris Balaii, Director of Public Works Fritz Buchman, Deputy DirectorlDevelopment Michael Selling, Deputy Director/Engineering Jim Stone, Deputy Director/Operations Naiee Zarif, lntenm Business Administrator Christine Karl Environmental Scientist CalRecycle, WPCMD PO Box 4025 MS 10A-15 Sacramento CA 95812-4025 SUBJECT: REVISED PRELIMINARY CLOSURE AND POSTCLOSURE MAINTENANCE PLAN (PC/PCMP) FOR FOOTHILL LANDFILL AND ADMINISTRATIVE SEPARATION OF PC/PCMP INTO LF -1 AND LF -2 (FACILITY PERMIT 39-AA0004) Enclosed please find Tables and Figures, comprising the revisions to the Preliminary Closure / Post Closure Maintenance Plan (PC/PCMP) for LF -2 in accordance with WDR No. R5-2015- 0058, Provision H.10. Preliminary plan and timeline for partial / phased landfill closure of LF -2: San Joaquin County will place intermediate cover of at least 12 -inches of compacted soil over surfaces that will not receive waste for more than 180 days. The County may place final cover in phases or may place partial cover until filling is complete and then construct the final closure cover over the remaining surface of the landfill. Preliminary demonstration under Title 27, Section 20080(b) for an Engineered Alternative Design (EAD) final cover: The final cover of LF -2 shall be consistent with the Evapotranspiration (ET) Test Pad Demonstration Project performed as part of the LF -1 cap closure in 2006. The Central Valley RWQCB approved the ET Test Pad Assessment Report in a letter dated July 11, 2014. CalRecycle accepted the CQA Report for the closure project in a letter dated July 29, 2014. Revised closure and postclosure financial assurance cost estimates: The County has separated the PC/PCMP cost estimates for Foothill into LF -1 and LF -2 estimates as required by the WDR. The costs have been allocated based on the areas of the 2 landfill units. LF -1 has a footprint of 81 acres, however only the closed 8 -acre cap will remain exposed at final closure. The side slopes of LF -1 will be covered by adjacent LF -2 and thus those areas are included in the LF -2 PCMP costs. Attached are: Table 1 — Preliminary Closure (PC) Cost Estimate for both LF -1 and LF -2, Table 1 -LF -1 — PC Cost Estimate for LF -1, Table 1 -LF -2 — PC Cost Estimate for LF -2, Table 2 — Postclosure Maintenance Plan Cost Estimate for both LF -1 and LF -2, Table 2 -LF -1 — PCMP Cost Estimate for LF -1, Table 2 -LF -2 — PCMP Cost Estimate for LF -2, Figure 6 — Final Cover Contour Map, Figure 6A — Final Cover Cross Section Detail.