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SECTION 1 -LANDFILL EXPANSION ISSUES Page 124 Citation Regulation Design Element ' Title 14, 17778, (g)(5) Run-on and run-off systems...designed Active landfill area run-off will be routed and constructed to...isolate to leachate collection system. uncontaminated surface waters from water that has come into contact with waste. Title 14, 17778 (h) Holding facilities shall be constructed so Detention facility designed to ISSJC that they will not be overtopped during a standards for 100-year,24-hair storm. 100 year,24 hour precipitation event... Title 14, 17778(i) Underdrains utilized and temporary No underdrains are used in the design; diversion ditches utilized during to the Final Grading Plan, Drawing P1, operating phase of the site shall not be shows the final drainage plan. Included in the final drainage design. Title 14, 17778 Q) Any subsurface final cover layer shall be Final cover will extend beyond the landfill designed and constructed to intersect liner and drain to the perimeter drainage with the final drainage system. system. Title 23,2533 (c) Flooding- New Class III...landfills shall be Rerouting of Uttle Johns Creek will designed,constructed,operated, and prevent inundation or washout of the maintained to prevent inundation or expansion phases of the landfill. washout due to floods with a 100-year return period. Title 23,Article 4, Capacity of precipitation and drainage Conveyance system and detention pond l Table 4.1 control structures: 100-year,24-hour sized for 100-year,24-hour event, J precipitation. Title 23,2546 (a) Waste management units and contain- Surface water design takes into account ment structures shall be designed and all these conditions. constructed to Gmit..ponding,infiltration, inundation, erosion, slope failure,wash- out, and overtopping.. This 23,2546(b) Precipitation an landfills...which is not All run-off from the active landfill area will diverted by covers or drainage control be routed to the leachate collection systems shall be collected and managed system. through the leachate collection and removal system .... Title 23,2546 (c) Diversion and drainage facilities shall be Surface water system Is designed for a designed and constructed to 100-year,24-hour event. accommodate the anticipated volume of precipitation and peak flows from surface run-off under the precipitation conditions specified in Table 4.1. (of this section of Regulations). Title 23,2546 (d) Collection and holding facilities Detention pond will be emptied within associated with precipitation and drainage 48 hours as required by ISSJC criteria control systems shall be emptied Immedi- for rural areas. ately following each storm or otherwiset r managed to maintain design capacity. e) 1 R.W.Beck and Associates City Of stocition 1811.002