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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -34- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY 141. Closure and Postclosure Specification E.3 requires that the Discharger submit a revised PC/PCMP for LF-2 only consistent with the requirements of this Order, including, but not limited to, the requirement for separate, prior closure of LF-1; a preliminary plan for partial/phased LF-2 closure; the need for a preliminary demonstration under Title 27, section 20080(b) if an EAD final cover (e.g., ET cover) is proposed; and revised financial assurance cost estimates, as necessary. See also Provision H.10. 142. Pursuant to Title 27, section 21090(e)(1), this Order requires a survey of the final cover following closure activities for later comparison with iso-settlement surveys required to be conducted every five years. 143. This Order final closure and post-closure maintenance plans, design documents, and CQA plan be submitted for review and approval at least 180 days prior to actual closure. 144. Landfill postclosure maintenance and monitoring activities will include final cover maintenance; leachate management; maintenance and monitoring of LFG facilities; groundwater, vadose zone, and surface water monitoring; maintenance of precipitation and drainage controls; and other postclosure related activities. The PC/PCMP includes optional plans (depending on circumstances and subject to agency approvals) to develop the area where the large storm water pond is located in the southeast corner of the site and to move the LFG flare station and related facilities onto the landfill final cover surface after closure. 145. Once every five years during the post-closure maintenance period, aerial photographic maps of the closed landfill area will be made to identify and evaluate landfill settlement. Iso-settlement maps will be prepared to determine the amount of differential settlement occurring over the previous five years. Pursuant to Title 27, section 21090(e)(2), this Order requires iso-settlement maps to be prepared and submitted every five years. 146. The completed final cover will be periodically tested for damage or defects by monitoring surface emissions pursuant to California Code of Regulations, title 17, section 95471(c) and Title 27, section 21090(a)(4)(A). Defects will be repaired and tested for adequacy based on the closure CQA Plan. 147. Surface impoundments shall be closed in accordance with Title 27 sections 21400 and 20950, subdivision (c)(2), which require removal of all free liquid and treatment of any residual liquid at the time of closure. Following removal and treatment of liquid wastes, surface impoundments shall be closed by clean closure, closure as a landfill, or closure as a land treatment unit. Unless the Discharger demonstrate, and the Central Valley Water Board finds, that it is infeasible to attempt clean-closure of a surface impoundment, then all residual wastes, including sludges, precipitates, settled solids, and liner materials contaminated by wastes, must be completely removed from the impoundment and discharged to an approved Unit (Title 27, § 21400, subd. (b)(1)).