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HomeMy WebLinkAbout3103_DuplinTS_ClosurePlan_20220831DUPLIN COUNTY TRANSFER STATION CLOSURE PLAN L INTRODUCTION AND BACKGROUND This transfer station closure plan has been created on behalf of the Duplin County Department of Solid Waste for the Solid Waste Handling and Transfer Facility (Permit No. 31-03T). Closure activities for this facility will be conducted in agreement with this plan, the North Carolina Waste Management Rules, and generally sound environmental and waste management practices. The MSW transfer facility accepts waste from Duplin County and transports its waste to the Sampson County Disposal Inc. Landfill in Roseboro, NC, which is a lined waste management facility (Permit No. 82-02). Closure of the transfer station will commence at such time as determined by Duplin County, and in conformance with this plan. Zoning approval was acquired when the MSW transfer facility was originally permitted in 1993. II. FACILITY LOCATION The Duplin County MSW Transfer Facility is located near Rose Hill, North Carolina. The facility, which is owned and operated by the County of Duplin, is located approximately 4 miles northeast of Rose Hill, NC on Landfill Road (SR 1918). The physical address is as follows: Duplin County Transfer Station 325 Landfill Road Rose Hill, North Carolina 28458 The mailing address is as follows: Duplin County Transfer Station PO Box 976 Kenansville, NC 28349 III. FACILITY OWNER The facility is owned and operated by Duplin County. The key personnel associated with operations are: Derrel Whaley, Solid Waste Director PO Box 976 Kenansville, NC 28349 Telephone: (910) 289-3091 Email: derrel.whaleykduplincountync.com Joy Pickett, Assistant Solid Waste Director PO Box 976 Kenansville, NC 28349 Telephone: (910) 289-3091 Email: joy.pickett(&duplincountync.com The main MSW transfer structure is a metal building constructed on a concrete slab and retaining wall, which enclosed on three sides, keeping one open facade that provides accessibility for incoming vehicles. One of the enclosed sides provides an entrance for service vehicles to the tipping floor. The tipping floor encompasses an area of approximately 10,000 square feet (100 feet by 100 feet). Transfer trailers are positioned in a loading bay under the tipping floor. Incoming loads are discarded onto the concrete tipping floor where they are compacted into the transfer trailer located on the lower level. Leachate that is generated from normal activities and from regular washing or pressure washing of the tipping floors is collected through drains in the lower -level floor. These drains empty into the onsite holding tanks which will be pumped out by a licensed septage hauler. Any solid waste not removed from the transfer station will be stored in an enclosed transfer trailer overnight. V. SOURCE, TYPES, AND QUANTITIES OF WASTE The source of municipal solid waste is from residential, commercial, and industrial facilities located within Duplin County. The MSW handling and transfer facility is used solely for the handling and conveyance of municipal solid waste generated within Duplin County. The Facility only accepts solid waste as defined in G.S. 130A — 290(35). Any hazardous, liquid, or other prohibited materials found in the waste stream shall be removed and held for proper disposal. The waste is transferred to the site in publicly and privately owned vehicles of various types and sizes. Between July 1, 2021 through June 30, 2022, 45,221.92 tons of MSW was accepted at the Duplin Transfer Station, which equates to approximately 3,768.5 tons per month. This equates to approximately 28.99 (-29) tons of waste per day based on a five-day work week. This rate is expected to remain relatively constant relative to population growth. Thus, a proportional increase in waste quantities should be expected as Duplin County's population increases. VI. CLOSURE PLAN The following describes the closure process for the Duplin County transfer station once a decision is made to cease operations. The facility will be properly closed in accordance with the requirements of 15A NCAC 13B .0406. A. Description of Closure Activities Once a decision has been made to close the Duplin County Transfer Station, a written notification of the closure will be submitted to the NCDEQ Division of Waste Management (DWM) no less than ninety (90) days prior to the cessation of waste acceptance at the facility. All closure activities will be conducted in accordance with the Closure Plan and in accordance with 15A NCAC 13B .0406. Closure activities will begin no later than thirty (30) days after the receipt of the final waste load and will include removal of remaining solid waste, closure of the leachate collection system, and securing the premises. Closure activities will be completed within 180 days after beginning closure activities. During closure, all remaining wastes that will not be recycled, will be removed for proper disposal at an approved disposal location, currently the Sampson County Disposal, Inc. Recyclable wastes will be removed and disposed of at an approved recycling facility, currently anticipated to be the same facilities that accept recyclable materials from the Duplin County Transfer Station. • Duplin County accepts used tires daily. Tires are stacked by the public into the storage trailer. Once the facility is closed, any remaining tires will be placed into the remaining trailers and taken to the contracted tire recycling firm for final disposal/recycling. • A recycling warehouse is on site to process source separated recyclable materials for market. At the time of closure any remaining recyclable materials collected at the facility will be placed in appropriate containers and hauled away for recycling by the appropriate contract vendor. • Used lead -acid batteries are collected in a designated location and are stored on a wooden pallet adjacent to the recycling warehouse. All remaining lead acid batteries will be processed for recycling by the contract vendor and the pallets will be scrapped and ground with other pallets recycled on site. • White Goods, which contain Freon, are collected by the facility and stored in one designated area in the metal storage area. The freon is properly removed, and the discarded materials are removed every two weeks by Encore Recycling. Freon will be removed from all remaining white goods as applicable, and the white goods will be recycled by a contract vendor. Other forms of scrap metal will be collected at the designated area and removed for final disposition by a contract vendor along with the white goods. All remaining wastes that will not be recycled, will be removed for proper disposal at an approved disposal location, currently the Sampson County Disposal, Inc. Any solid waste located on the facility grounds including wind-blown liter and accumulations of waste within the transfer station building and loading bay area, will be removed and disposed of in transfer trailers for final disposal at the referenced landfill. Recyclable wastes will be removed and disposed of as noted above, at an approved recycling facility, currently anticipated to be the same facilities that accept recyclable materials from the Duplin County Transfer Station. The transfer station building including the side walls, push walls, tipping floor and loading bay area will be pressure washed once all solid waste has been removed from the facility. Leachate from the pressure washing activity will be collected in the leachate collection system and removed for proper disposal. As noted above, the transfer station structure is enclosed on three (3) sides, and pressure washing activities may necessitate use of a lift to reach to upper elevations of the structure. It is anticipated the metal structure will remain at the facility at the time of closure until such time as the County decides whether it can be repurposed for some other use, therefore, no additional closure costs other than pressure washing are anticipated. Access to the loading bay from the tipping floor will be secured with fencing or in some other manner to prevent a fall into the loading area by anyone at the facility, or wildlife. Leachate from the pressure washing activity will be collected in the leachate collection system and removed for proper disposal. It is anticipated the pressure washing activities may require multiple mobilizations and several days for each mobilization to complete the work. Potential work stoppages may occur due to the leachate storage tank filling up, which will require pumping and hauling of the leachate for disposal. The leachate collection system consists of a number of drains connected to a series of pipes that collect and direct leachate to two (2) 2,500 on -site storage tanks. Once all remaining solid waste has been removed from the transfer station and the station has been pressure washed, any leachate remaining in the storage tanks will be pumped and removed for disposal at an approved disposal facility. Duplin County anticipates the contractor currently responsible for pumping and hauling leachate, or another contractor as determined by Duplin County, will remove all remaining leachate from the tank for disposal. The drains, catchments, and piping connected to the leachate collection tank, as well as the tank, will also be cleaned through pressure washing or other appropriate means to remove residual leachate residues. Any and all remaining leachate will be pumped a disposed at an appropriate disposal facility. Upon removal of the remaining leachate, all drains connected to the leachate collection systems will be plugged in a manner such that storm water or other liquids cannot enter the leachate collection system. Leachate piping will be removed and disposed of as solid waste at an approved landfill and the leachate collection tank will either be removed for disposal, crushed in place or filled with a flowable fill to prevent the tank from being reused. At this time the County anticipates that the two (2) tanks, once emptied of leachate and residue, will be filled with flowable fill or concrete to prevent them from being used. The facility office and scale house will be emptied and secured against unauthorized entry. Duplin County may retain the office in the event the property is repurposed for another use. The facility grounds will be secured by a fence and locking gate in a manner to preclude easy accessibility to the property. Appropriate signage will be placed at the entrance to inform residents the facility is closed. B. Closure Schedule The closure schedule will be as follows: 1. Duplin County will send written notice to the DWM no less than ninety (90) days from the date the facility anticipates receipt of the last load of solid waste. 2. Closure activities will begin within thirty (30) days from receipt of the last load of solid waste. 3. Within 180 days, Duplin County will complete the closure of the transfer station. 4. Upon completion of the closure, Duplin County will send a written notification to the DWM of the closure and how the facility was closed for placement in the operating record. 5. Duplin County staff will be available for any inspection deemed necessary by the DWM. C. Corrective Action Duplin County will undertake any corrective action deemed necessary by the DWM in accordance with 15A NCAC 13B .0406 (c). Specifically, Duplin County will conduct any required groundwater and surface water monitoring determined to be necessary and after consultation with the DWM staff, in accordance with 15A NCAC 13B .0405(a)(2). Monitoring and corrective action, if required, will continue as post closure care until the DWM authorizes termination of any required activities. Because there is currently no post closure care associated with this facility due to impacts to either groundwater or surface water resources, no costs have been provided, since these costs would be highly dependent upon the nature and extent of the monitoring and/or corrective actions needed, and the duration of those activities. In the event post closure care costs associated with the above are required, Duplin County will amend the closure plan to include the estimated costs for the duration of the post closure care, and to ensure compliance with 15A NCAC 13B .1800. In the event the DWM requires post closure care monitoring or corrective cation, or Duplin County elects to leave the leachate collection system and tank in place for future use, the County will submit to the DWM a notice that the site has been recorded with the Register of Deeds that will include the information stipulated in 15A NCAC 13B .0406(b)(4). Duplin County may request removal of land use restrictions in accordance with 15A NCAC 13B .0406 (d). D. Closure Cost Estimate Costs associated with the final closure of the transfer station were estimated based on information available at the time of this closure report. It is currently unknown how much waste will need to be removed from a facility in the event of a closure. It is assumed that since this is a County owned facility, that it will continue to operate and receive/recycle solid waste up to the time of closure when no additional waste will be received. Assumptions were made that there will be a need to remove some additional wastes from the facility grounds as part of the "housecleaning" activities, therefore, costs were estimated based on these assumptions and current rates for particular activities. For the purposes of closure, it was assumed that up to three (3) transfer trailers would be needed to remove any remaining wastes not disposed of by contract vendors, and that accumulated after the date the last load of wastes were to be received from the public as noted in B.1 above. Current costs for a 40 yd. transfer trailer are approximately $1,000 per load inclusive of tipping fees for a 40 yd. trailer filled and compacted to the degree possible, therefore the estimated cost for three (3) trailers is $3,000. An estimate of $5,000 was used as a buffer for waste disposal purposes in the event additional waste removal is necessary, including the removal of recyclable materials if a contract vendor is not available. Pressure washing costs are variable and dependent upon the scope of cleaning activities, whether there is a need for a lift to reach the higher elevations of a structure and the amount of water generated during cleaning activities. Assumptions were made that the pressure washing activities may require at least two (2) mobilization and cleaning operations, one for the facility and one for the leachate collection and storage system. To the extent possible, scheduling attempts will be made to reduce the time on site and number of mobilizations. The Duplin County facility is closed on 3 sides and has elevated exterior walls that may require use of a lift. There is also a loading bay located below the elevation of the tipping floor that will require care when pressure washing activities are occurring. Costs associated with multiple mobilizations, the rental of a lift and the scale of the structure are estimated at $1,000 per mobilization of equipment and between $6,000 - $7,500 per pressure washing event (week duration), with two (2) events estimated for the closure, totaling up to $17,000. There are two (2) leachate storage tanks, each with a 2,500 gal. capacity. Current disposal rates at are estimated at $1,500 to pump and haul leachate from both 2,500 gal. tanks. Typical hauling rates may range from $0.03 - $.10/gal on average, depending on the distance hauled to the nearest disposal facility. Assuming three (3) pumping events, the total cost for leachate disposal would be approximately $4,500.00. Decommissioning costs for the leachate collection system and tank will vary depending on whether the tanks are crushed in place, filled with flowable fill or physically removed from the ground (the higher cost option). The estimated cost may vary between average of $10,000 for filling in place to as much as $50,000 for removal of a tank and backfilling the excavation. Because the tanks share a common excavation and are therefore close to each other the added cost to pressure clean and fill two tanks versus one marginal. Duplin County would propose to abandon each of the tanks in place and filling each of the tanks with flowable fill once cleaned of leachate and residue. The leachate collection system piping and drain will be filled with concrete to prevent accumulation of stormwater in the piping and tank. In the event piping is removed, it will be disposed of at the landfill. Costs are estimated to be approximately $20,000 to clean and fill the tanks and leachate collection drain and piping. Administration costs, if performed by a contracted firm as opposed to County staff, and assuming 20 hours of project oversight per week for six (6) months may range from $45,000 - $65,000. Travel time and per diem costs will drive up the administration costs by approximately $5,000 - $10,000. This estimate is inclusive of providing the required notification to the NC DEQ, arranging for various contractors including bid solicitation and contractor selection, and overseeing the closure activities. Costs may be less depending upon the staff level used for the project oversight, the actual amount of time needed on sight, and the amount of travel and per diem needed. For the purposes of closure, an estimate using the higher amounts for travel and per diem suggests the administration costs would be $55,000. Closure cost estimates, including any costs associated with post closure care monitoring and/or corrective action are not provided. In the event post closure care monitoring and corrective action is required by the DWM, costs will be revisited as required to ensure financial assurance requirements are maintained, and the closure plan will be modified to include post closure care requirements. Estimated costs associated with the closure of the facility include the following: 1. Mobilization/demobilization - $2,000 2. Pressure Washing - $15,000 3. Leachate Disposal - $4,500 4. Leachate Collection System - $20,000 Decommissioning 5. Signage - $500 6. Waste Disposal — Cleanup, - $5,000 Hauling, Tipping Fee 7. Administration - $55,000 Total Closure Cost Estimate - $102,000 E. Post Closure Care There is currently no post closure care associated with this facility due to no known impacts to either groundwater or surface water resources. In the event the DWM requires groundwater and/or surface water monitoring, or corrective action at this facility in accordance with 15A NCAC 13B .0405(a)(2), additional information associated with the post closure care will be provided. In addition, cost estimates will be provided for any post closure care activities including the anticipated duration of time for post closure care. In the event the DWM requires post closure care monitoring or corrective action, or Duplin County elects to leave a leachate collection system and tank in place for future use, the County will submit to the DWM a notice for the site that has been recorded with the Register of Deeds, that will include the information stipulated in 15A NCAC 13B .0406(b)(4)(A — C) as follows: • The notice shall be discoverable during a title search for the site property deed. • The notice shall be in accordance with G.S. 130A-310.71(e) or G.S. 14313-279.10. • The notice shall notify any potential purchaser of the property that the land has been used as a solid waste management facility and its use may be restricted by the Division Duplin County may request in writing removal of land use restrictions in accordance with 15A NCAC 13B .0406 (d). F. Record Retention Records of the closure activities, final disposition of all wastes including recyclable wastes and leachate, will be retained for a minimum of five (5) years or as otherwise specified by 15A NCAC 13B .0405(d).