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Page 1-25 SECTION 1 -IANDFIU EXPANSION ISSUES Citation Regulation Design Element Title 23,2546 (e) Surface and subsurface drainage from No subsurface drainage is anticipated. outside of a waste management unit shall Drainage from closure of the existing be diverted from the waste management landfill area will be intercepted and unit. diverted from horizontal expansion phases. Little Johns Creek will be realigned to the north of the existing landfill. Title 23,2546 (f) Cover materials shall be graded to divert Final and Intermediate cover grades will precipitation from the waste management range between 5°/®to 250 unit,to prevent ponding of surface water over wastes,and to resist erosion as a result of precipitation .... Title 23,2581 (b) (1) Grading requirements:Closed landfills Minimum final grade is 5%. shall be graded and maintained to prevent ponding and to provide slopes of at least three percent. Lesser slopes may be allowed... Title 23,2581 (b) (2) Areas with slopes greater than ten Interception ditches, sift fences,and percent,surface drainage courses, and cover crops will be used to protect areas subject to erosion by water and slopes from erosion. Drainage ditches wind shall be protected or designed and will be lined where velocities require constructed to prevent such erosion. subgrade protection. 40 CFR 258.25(1) A run-on control system to prevent flow Surface water drainage systems are onto the active portion of the landfill . designed based on a 100-year storm. during the peak discharge from a 25-year storm. 40 CFR 258.25(2) A run-off control system from the active Surface water collection pipes are portion of the landfill to collect and control provided at the perimeter of the liner to the water volume resulting from a 25-year route active area run-off directly to the storm. leachate collection system. 40 CFR 25827 MSWLF units shall not: All active area surface water run-off will (a)Cause a discharge of pollutant into be routed to the leachate collection waters of the United States,including system. wetlands,that violates any requirements of the Clean Water Act..fncluding NPDES requirements. r (b)Cause the discharge of a nonpoint source of pollution to water of the United States, including wetlands,that violate the requirements of any area-wide or state wide water quality management plan... 1.6.3 Realignment of Little Johns Creek Little Johns Creek currently is located to the south of the existing landfill. For the proposed Austin Road Landfill expansion, this creek would be realigned to the north and west of the existing landfill. This proposed realignment increases the overall length of the creek by three percent,with R.W.Bads and as City of Stockton1815.002