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HomeMy WebLinkAboutMayo Proposed Permanent Water Solution_20161027Permanent Water Supply Proposal to DEQ - Mayo Mayo Steam Station Person County 22 eligible households Duke Energy has evaluated the feasibility and costs of providing a permanent replacement water supply to eligible households, as required under G.S. 130A-309.21 1 (cl) of House Bill 630. Households were designated as "eligible" if any portion of a parcel of land crossed the mile compliance buffer described in HB630 and if the household currently utilized well water or bottled water (under Duke Energy's bottled water program) as the drinking water source. Although HB630 indicates that households are to be covered, Duke Energy has included one (1) business as an eligible location. Undeveloped parcels were identified but were not considered "eligible" because groundwater wells are not currently utilized as a drinking source. Dewberry, a respected outside vendor, conducted the Potable Water Programmatic Evaluation (attached); the evaluation consisted of a survey of eligible households and a preliminary engineering evaluation, cost estimate and schedule. Dewberry's report, for the most part, assumes one metered connection per parcel; therefore, multiple homes may be serviced by one connection. The total count in this proposed plan includes all final connections. The City of Roxboro indicated that they had water quality concerns with providing water to any of the eligible households within the'/2 mile boundary due to low water demand and the residence time of the water in the pipeline, but they would be open to providing water service to the eight (8) households south of the Steam Station. They indicated that it would not be feasible to provide potable water to the 14 households north of the station, including those in Virginia. The closest existing City of Roxboro municipal line is located near the intersection of Boston Rd/Hwy 501 and Old US Highway 501. The closest household is approximately 3,000 feet (0.6 miles) from the current line. The furthest household is approximately 5,300 feet (1 mile) from the current line. The estimated cost to provide a municipal line to the eight (8) households south of the station is $1,200,000, or $150,000 per household. The Dewberry evaluation includes a project schedule based on their past experience installing public water systems. The preliminary project schedule indicates that a permanent water supply could be available through the City of Roxboro by August 2018. Based on the results of the Dewberry evaluation, the concerns raised by the City of Roxboro on water quality, and the overall construction costs, Duke Energy proposes that all 22 households be offered a water treatment system. The performance standard for the public water system is the Federal MCLs. The performance standard for the water treatment system is also the Federal MCLs except for those constituents identified in 2015 as having potential health concerns: arsenic, hexavalent chromium, cobalt, iron, lead, manganese, sulfate and vanadium. For these constituents, the performance (� DUKE �, ENERGY Permanent Water Supply Proposal to DEQ - Mayo standard will be either one-half of the MCL or the appropriate state standard, whichever is more protective. Duke Energy is currently evaluating an ion filtration treatment system; this system has been successfully installed in other parts of the state, and initial results show it performs well in reducing vanadium and hexavalent chromium, among other constituents. The costs shown below are for a conceptual ion filtration treatment system. The final water treatment system will be based upon the results of field studies. Duke Energy has made efforts to identify all eligible households, but it is anticipated that a nominal number of additional households will be identified during the initial outreach effort conducted upon approved of this plan by NCDEQ. If the final number of households results in a conclusion different than those stated in this preliminary plan, Duke Energy will revise and submit the new plan to NCDEQ for evaluation and approval. Well owners will be responsible for making the decision for their parcels. Only households within the'/2 mile boundary and served by well water at the time of the submittal of this plan will be eligible for a permanent water supply as part of H13630. (' DUKE ENERGY Permanent Water Supply Proposal to DEQ - Mayo Ion Filtration Water Treatment System Total Number Recommended 22 Water Quality Criteria Meets applicable water quality Yes standards (Federal MCLs) Completion Schedule Estimated completion date 12/2017 Contingency factors N/A Operational Considerations Required acceptance level to achieve consistent water N/A quality and supply Required acceptance level to i achieve targeted cost per N/A eligible household (<$35k/household) _ Location of households relative to existing municipal N/A water lines Other considerations Costs Total Installation Costs $154,000 - $220,000 Approximate cost per eligible $7,000 - $10,000 household Annual Maintenance Costs $11,000 - $44,000 $500 - $2,000 Maintenance cost per household annually Non -Duke Costs Total estimated water bills N/A monthly Estimated water bills monthly N/A per household Ongoing municipality costs for maintenance and flushing due N/A to low-flow/low-usage Total Costs (Duke and Non -Duke) Total estimated cost for all eligible neighbors over 10 $264,000 - $660,000 I_ years Total estimated cost for each eligible neighbors over 10 $12,000 - $30,000 years DUKE ENERGY:. Dewberry Mayo Steam Station Phase II Potable Water Programmatic Evaluation Duke Energy October 27, 2016 SEAL 0=5 e t �5 SUBMITTED BY: Dewberry 2610 Wycliff Road Suite 410 Raleigh, NC 27607 SUBMITTED TO: Duke Energy Table of Contents ExecutiveSummary ...............................................................................................2 1. Introduction and Project Approach..............................................................4 2. Phase II Basis of Design................................................................................6 2.1 Potable Water Connection Mapping.............................................................. 6 2.2 Municipal Potable Water Connection Opinion of Probable Cost.................6 3. Site Analysis...................................................................................................7 3.1 Station Mapping and Household Data.......................................................... 7 3.2 Field Observations.......................................................................................... 7 3.3 Other Considerations..................................................................................... 8 4. Regulatory Permitting....................................................................................9 5. Schedule........................................................................................................10 6. Opinion of Probable Cost............................................................................11 Appendix A: Mayo Station Phase II Mapping Appendix B: Mayo Station Household Data Spreadsheet Appendix C: Schedule Appendix D: Opinion of Probable Cost 9 Dewberry Duke Energy I Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 11 Executive Summary This Phase II evaluation is structured to comply with the requirements of North Carolina House Bill 630: Section 13oA-309.211.(ci) of House Bill 63o requires provision of permanent water supply for each household that has a drinking water supply well located within a 1/2 mile radius from the established compliance boundary of a coal combustion residuals impoundment, and is not separated from the impoundment by the mainstem of a river, or other body of water that would prevent the migration of contaminants through groundwater from the impoundment to a well. To address the provisions of House Bill 63o, Dewberry performed this Phase II preliminary engineering evaluation to supply potable water to residents within a 1/2 mile of the compliance boundary. Preparation of this report is intended to comply with the House Bill 63o requirement to make a report submittal to the North Carolina Department of Environmental Quality (DEQ) by December 15, 2o16. On August 18, 2016 a project review meeting was held at the Duke Energy Line and Service Operations Center in Roxboro, NC. Representatives from Duke Energy, Dewberry, and the City of Roxboro attended the meeting. Detailed Phase II mapping was developed using Person County, NC and Halifax County, VA property maps that show each household in the 1/2 mile compliance buffer. Dewberry visually observed the households shown on the Phase II mapping on August 12, 2o16. A household database was developed using Person County, NC and Halifax County, VA tax records tied to the GIS shape file which identifies the property owner and the address for each household within the 1/2 mile compliance buffer. Based on our site observations and the Phase II mapping, it appears to be technically feasible to install the potable water main in the public road right of way or along private roads using conventional construction methods. Easements will be required along one private road (Mullins Lane). A schedule was prepared in part to show milestone dates needed to comply with House Bill 630 which states the following: • Report submittal to the North Carolina DEQ no later than December 15, 2016. • DEQ renders a final decision to approve or disapprove the report no later than January 15, 2017. • Permanent replacement water supplies are provided no later than October 15, 2o18. If each of the milestone dates are met, the schedule indicates that project completion can occur in August of 2o18 which meets the House Bill 630 schedule requirement for permanent replacement water supplies. An opinion of probable cost was developed to provide potable water service to eight households within the 1/2 mile compliance buffer. The number of households and the number of waterline connections are the same. The estimated costs are summarized below: TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 2 The potable water connection cost estimate includes a 25% contingency which is deemed consistent with a project at the preliminary engineering level of detail. According to Roxboro, the water age in the vicinity of the Steam Station is approximately 9 to 12 days. With such a high water age, the City of Roxboro has water quality concerns related to residual disinfection concentration and disinfection by-product formation for any water connection within the 1/2 mile compliance buffer. Despite the concerns, Roxboro indicated that they would be open to providing service to the 8 households south of the Steam Station, but indicated it would not be feasible to provide service to the 14 households north of the Steam Station. Therefore this evaluation proposes installation of individual filtration systems for the 14 households. This report provides additional detail on the Project Approach, Basis of Design, and Site Analysis. Mayo Steam Station mapping is provided in Appendix A. The household database is provided in Appendix B. The Mayo Steam Station Potable Water Schedule is provided in Appendix C, and the Opinion of Probable Cost is provided in Appendix D. TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 3 1. Introduction and Project Approach PROJECT INTRODUCTION During the Phase I programmatic potable water evaluation desktop study, concept level mapping was developed showing the Mayo Steam Station location, the potential potable water tie-in location, and potential pipe routing to residents within a 1/2 mile of the compliance boundary. We used the Phase I mapping to develop a concept level cost estimate with a 40% contingency. During this Phase II evaluation sufficient preliminary design work has been performed to prepare a cost estimate with a 25% contingency. Section 13oA-309.211.(ci) of House Bill 63o requires provision of permanent water supply for each household that has a drinking water supply well located within a 1/2 mile radius from the established compliance boundary of a coal combustion residuals impoundment, and is not separated from the impoundment by the mainstem of a river, or other body of water that would prevent the migration of contaminants through groundwater from the impoundment to a well. To address the provisions of House Bill 63o referenced above, Dewberry has performed a Phase I screening level evaluation and this Phase II preliminary engineering evaluation of the technical and economic feasibility to supply municipal potable water to residents within a 1/2 mile radius of the compliance boundary. Preparation of this report is intended to comply with the House Bill 63o requirement to make a report submittal to the North Carolina Department of Environmental Quality (DEQ) by December 15, 2016. Using publicly available information Dewberry evaluated the following criteria to perform the Phase II Mayo Steam Station preliminary engineering study: • Identified public road right-of-way widths and ownership along the pipe route • Evaluated feasibility to install the proposed water main within the unpaved shoulder of an NC DOT roadway • Documented approximate location of U.S. waters, including possible wetlands shown in the U.S. Fish & Wildlife Service National Wetlands Inventory (as applicable) • Identified potential jurisdictional and permitting authorities to establish permitting needs • Estimated potential easement acquisition areas (estimated square footage and number of parcels affected) • Evaluated potential conflicts with known existing utilities • Estimated the pipeline length and pipe diameter(s) for the water main and the individual service lines • Evaluated the potential need for a water booster pump station or elevated tank to sustain adequate water pressure • Evaluated the water age and potential need for supplemental disinfection • Evaluated the potential need/requirement for fire hydrants and hydrant quantity • Evaluated potential construction methods and challenges • Evaluated potential municipal water system future improvements based on published Capital Improvement Plan (CIP) or published Master Plan TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 4 PROJECT APPROACH Dewberry contacted the Duke Energy Community Relations District Manager to discuss the information needed to execute the Phase II evaluations, and to arrange for a subsequent meeting with the local water purveyor, the City of Roxboro. On August 18, 2016 a project review meeting was held at the Duke Energy Line and Service Operations Center in Roxboro, NC to discuss execution of this Phase II preliminary evaluation and subsequent project execution. Representatives from Duke Energy, Dewberry, and the City of Roxboro attended the meeting. The primary purpose of the meeting was to confirm the water distribution system tie-in location, system pressure, pipe size, and water quality at the tie -location, capacity limitations, and whether there are future planned water system projects that could impact the Phase II evaluation. Dewberry also inquired as to whether any households within a 1/2 mile of the compliance boundary were presently being served by municipal potable water. Following the meeting, Dewberry performed an initial drive -by observation of the potable water pipe route. During Phase I Dewberry obtained municipality mapping of the potable water distribution system and then developed draft maps showing the Mayo Steam Station, the respective potable water distribution system tie-in location, and the water main pipe routing. We used the Duke Energy Drinking Water Receptor Surveys for Coal-fired Power Stations developed in 2014 to show compliance boundaries and the water supply wells within a 1/2 mile of the compliance boundary. The maps were prepared using GIS as the native software. During Phase II we developed more detailed mapping based on Person County, NC and Halifax County, VA property maps to identify property owners, property parcels, and household addresses within the 1/2 mile compliance buffer. For the Phase II analysis property parcels that were wholly or partly within the compliance buffer were included in the evaluation. Using the Phase II mapping a database of property owners and household locations was developed. Dewberry also contacted the City of Roxboro to confirm residents along the existing water mains within the compliance buffer who are connected to the system. This information allowed for identification of residents who were located along the existing water line but not connected to the water system. We also prepared a project schedule. Dewberry then developed an opinion of probable cost for the installation of piping infrastructure to the potable water tie-in location. We used vendor budgetary costs for the primary capital equipment and used cost factors to estimate the installation costs. We did not obtain contractor installation cost estimates for this evaluation. Dewberry reviewed the cost data with Duke Energy to obtain concurrence on the methodology and the allowances applied. TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 5 2. Phase II Basis of Design The purpose of this section is to document basis of design assumptions that were used to prepare the Mayo Steam Station mapping, opinion of cost, and schedule. 2.1 POTABLE WATER CONNECTION MAPPING Key assumptions for the potable water connection mapping are as follows: Property parcels that crossed the compliance buffer line were included in the evaluation. Homes on these properties were included to receive potable water regardless of whether the home was physically inside the buffer or not. Potable water piping is routed along state roads and may use municipality/county existing easements, where possible. Water main piping in one location will require private easements. 14 households located north of the Mayo Steam Station are recommended to receive individual filtration systems and were not included in the cost evaluation. Power transmission line easements will not be used for installation of the potable water piping. 2.2 MUNICIPAL POTABLE WATER CONNECTION OPINION OF Key assumptions for the potable water connection cost estimates are as follows: Item 1 on the cost estimate shows 6" Ductile Iron for the potable water main pipe. The 6" diameter is considered a conservative pipe size to meet the water demand of the households within the compliance buffer and complies with the City of Roxboro. The 6" water main pipe is the smallest diameter allowed for fire hydrant connection. The City of Roxboro water system design standards require fire hydrants be installed. Items 1 through 7 on the cost estimate show material cost for the piping, valves, and associated fittings. The sum of Items 1 through 7 is shown as a separate line item. A 30% cost factor is then applied to the summed value to estimate the cost to install the pipe, valves, and fittings. The cost estimate quantities are based on the Mayo Steam Station mapping and assumptions stated on the cost estimate. The unit costs are based upon vendor budgetary costs and cost data we have from recent similar projects. Item 22 on the cost estimate indicates there are 8 potable water connections with 3/4" service taps. The number of household connections shown in the cost estimate is based upon the Person County, NC property maps, drive -by observations, and from exclusion of households that are being served with City of Roxboro water. Items 8 through 17 and items 21 through 25 are installed cost, so a 30% installation cost factor was not applied. Items 18 through 20 are material cost, so a 30% installation cost factor was applied. Items 1 through 25 are summed and shown as a SUBTOTAL. Cost factors are then applied to the SUBTOTAL to estimate the balance of the project costs. We have applied a 25% contingency which is deemed consistent with a preliminary engineering evaluation. Additional assumptions that Dewberry used to prepare the cost estimates are provided as foot notes on the cost estimate Table. Contractor General Conditions are included for the duration of on -site construction phase activities. Easement acquisition includes the cost to compensate land owners for water or service lines extended down private roads and/or across private property. TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 6 3. Site Analysis 3.1 STATION MAPPING AND HOUSEHOLD DATA The municipal potable water Phase II overall map in Appendix A shows the proposed tie-in location to the existing City of Roxboro potable water supply system, indicating that over one mile (~5,600 LF) of new potable water piping is required to serve households within the 1/2 mile compliance buffer. The City of Roxboro is planned to manage and own the water supply, O&M, and metering/billing of water use for the new potable water system and service connections. The Phase II Site map and sheets in Appendix A were prepared by overlaying Person County, NC and Halifax County, VA property maps onto the compliance boundaries detailed in the Duke Energy Drinking Water receptor Surveys for Coal-fired Power Stations developed in 2014. The Appendix A Site map shows the 1/2 mile compliance buffer and seven (7) rectangular property map sections. Seven sheets were prepared to show the water main route, individual households, and household service line connections within the 1/2 mile compliance buffer. Dewberry visually observed households shown in the Appendix B sheet mapping during the August 12, 2016 drive -by. The database in Appendix B was created from the Person County, NC and Halifax County, NC tax records tied to the GIS shape file which identifies the property owner and the address for each household within the 1/2 mile compliance buffer, including parcels of land with no residents (empty lot). The parcel data listed on the spreadsheets also includes Parcel ID, Land Use, Easement Requirement, and anticipated Water Demand for each property. Engineering judgment was utilized in cases where homes were located out of sight from the road and/or multiple structures could be seen during an aerial review. Review of the mapping from Appendix A allowed for estimates of the required private easement areas around the Mayo Steam Station. The potable water main proposed to serve residents around the Mayo Steam Station will require private easement acquisition along one private road (Mullins Lane). The typical municipal easement standard was followed around the Mayo Steam Station, which includes multiplying the length of the water main or service line on private property by 20 feet to obtain the area. The area was then multiplied by 50% of the average land value (per acre) as indicated by public tax assessment for properties around the Mayo Steam Station, providing an estimate of the easement cost. Temporary easements were not included in the calculation. 3.2 FIELD OBSERVATIONS As shown in Appendix A, the water main piping will be installed along state roads, where possible. During the August 12, 2o16 drive -by Dewberry noticed several areas where large boulders and rock outcroppings exist in the vicinity of the water main routes. We have included rock excavation within the schedule and cost estimate. Based on observations in the drive -by as well as the Phase II mapping, it appears to be technically feasible to install the potable water main in the public road right of way or along the side of the private roads using conventional construction methods, such as an open trench with pipe bedding material. Approximately three water main road crossings and two service line road crossings will be required. Road crossings will be performed by subsurface boring to avoid open road cuts, and traffic impacts. It should be noted that the crossing count could be modified based upon final design and which side of the road the water main is installed. TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 7 Dewberry did not observe surface water or apparent wetland infrastructure encroachment impacts. This is consistent with USGS mapping and the U.S. Fish & Wildlife Service National Wetlands Inventory. During the drive -by Dewberry did not observe potential conflicts with known existing utilities. At present the 22 households within the 1/2 mile radius compliance buffer do not have public water or sewer. Natural gas main and fiber optic markers were not observed during the drive -by, but are typically located within the state road right of way and are typically smaller in diameter than water piping, therefore the potential impact on construction is not deemed significant. Aboveground electric was observed and is not considered an impediment to water main installation. Dewberry observed the public road right-of-way widths and evaluated the feasibility to install the proposed water main within the unpaved shoulder of NC DOT roadway. In areas that we could not determine right of way status (public or not) or areas where private property may have been constructed onto right of way, we either provided an allowance for water main or water service line easement, or the construction impact is accounted for in the cost estimate as a renovation allowance. 3.3 OTHER CONSIDERATIONS The City of Roxboro operates a relatively large water system throughout Person County where they manage the water supply, and meter and bill for water use. The City of Roxboro sources their water from City Lake and Lake Roxboro. The City of Roxboro estimates the pressure in the system around the Mayo Steam Station to range from 50-6o psi. The City has confirmed they have adequate water flow capacity to serve the residents around the Mayo Station. Therefore based on this preliminary information, the flow capacity and pressure is deemed adequate to serve the eight proposed household connections in the 1/2 mile compliance buffer south of the Mayo Steam Station. Based on discussions with the City of Roxboro, the water age in the vicinity of the Mayo Steam Station ranges from 9-12 days. The new potable water connections are located at the end of the water distribution system and the residual disinfection concentration is low. Two common ways to combat loss of disinfection residual are 1.) disinfection boosting, and 2.) systematic flushing to maintain flow and minimize water age. Roxboro presently conducts regular flushing in the Mayo area to reduce the water age, maintain a disinfection residual, and prevent disinfection by-product formation. With such a high water age, the City of Roxboro has water quality concerns stating that a new water main extension coupled with limited water demand would complicate the disinfection byproduct compliance. Roxboro indicated that they would be open to providing service to the households south of the Steam Station, but indicated that they would not be able to provide service to the households north of the Steam Station. The new water main extension will serve households south of the Steam Station, utilizes the minimum diameter pipe for service allowed by Roxboro, and incorporates system flushing. The connection to the City of Roxboro system would be to an existing 12-inch water main that dead -ends at an existing industrial site. Based upon the current City of Roxboro operational practices and discussions with system operators, disinfection boosting is not proposed for the system. Due to water quality concerns, low water demand of the households north of the Steam Station, and future maintenance costs, Roxboro indicated extending their water system north along US Highway 501 North past the existing industrial site would not be viable. This would also include extending the line into Virginia. Based on the issues stated above, this evaluation proposes that the 14 households north of the Mayo Steam Station will be served with individual filtration systems. TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 8 4. Regulatory Permitting The water main design will be required to adhere to requirements of the following agencies and permitting authorities. Each permit will require a separate set of documentation and will be submitted individually to the respective permitting agency. The timeline for submittal and approval is presented in the Mayo Steam Station Potable Water Schedule detailed in Appendix C. • NCDOT Right-of-way Encroachment Agreement, Primary and Secondary Roads • NCDEQ, Division of Land Quality, Erosion and Sedimentation Control Permit • NCDEQ, Division of Water Resource, Public Water Supply Permit TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 9 5. Schedule The Phase II project schedule is provided in Appendix C. The schedule was prepared in part to show milestone dates needed to comply with House Bill 630 which states the following: • "No later than December 15, 2016 an impoundment owner shall submit information on permanent replacement water supplies proposed to be provided to each household" • "The Department shall evaluate information submitted by the impoundment owner and render a final decision to approve or disapprove the plan, including written findings of fact no later than January 15, 2017" • "As soon as practical, but no later than October 15, 2018 the owner of a coal combustion residual surface impoundment shall establish permanent replacement water supplies" The schedule indicates DEQ report submittal on December 15, 2016 and DEQ approval by January 15, 2017. The schedule includes an initial go day negotiation period for development and execution of a Water Authority/Duke memorandum of understanding (MOU). The schedule is subject to change dependent upon the milestone dates for the MOU, the approval/comments from DEQ, and the resident input regarding permanent water supply choice. The balance of the schedule is deemed typical for a municipal design -bid -build water line improvement project and plans for all households to connect to public potable water. The schedule indicates an end date of August 2018 which meets the October 15, 2018 deadline. TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 10 6. Opinion of Probable Cost The Phase II opinion of probable cost is provided in Appendix D. The opinion of probable cost was prepared in accordance with the basis of design criteria in Section 2.2 of this report. The opinion of probable cost indicates that the total estimated cost to construct eight new municipal water connections is approximately $1,200,000, which equates to approximately $150,000 per household. A 25% contingency is included. The Phase II opinion of probable cost includes individual allocations for the service connection lines and meters (items 18 through 25) that equates to approximately $9,00o per new connection. We arrived at that allocation as follows: For item 19 the service line lengths were measured for each household using the Phase II sheet mapping. Item 20 is for miscellaneous fittings associated with the service line connections. For items 21 and 22 the meter/meter box allowance was developed from vendor quotations and from recent bid tabulations for similar projects. Item 23 is for road crossings where the household to be served is on the opposite side of the road from the water main. Items 24 and 25 represent site costs associated with approximately 2,300 feet of new service line piping. TODewberry Duke Energy Mayo Steam Station Phase 11 Potable Water Programmatic Evaluation 11 Appendix A: Mayo Station Phase II Mapping www.dewberry.com v PIAI33 J 7 Shiloh Church Rd .11101. \ + . 1' 5 -a October 27, 2016 sups; Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Overall Legend County Boundary Proposed Potable Water Line (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands Duke Energy Plant Railway State Route Stream/Lake Recommended Individual Filtration System N 1 in = 2,000 feet 0 2,000 4,000 Feet October 27, 2016 Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Sheet 1 Legend County Boundary Proposed Potable Water Line (Duke) Proposed Service Lines (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands Duke Energy Plant Railway Stream/Lake Recommended Individual Filtration System ® Parcel Reference Number (Refer to spreadsheet for parcel details) -X+ 1 in = 200 feet 0 200 400 Feet October 27, 2016 et' Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Sheet 2 Legend County Boundary Proposed Potable Water Line (Duke) Proposed Service Lines (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands Duke Energy Plant Railway Stream/Lake Recommended Individual Filtration System ® Parcel Reference Number (Refer to spreadsheet for parcel details) -X+ 1 in = 200 feet 0 200 400 Feet `31, NM' . WFF W .�1 W-W— r2^^ rr-^r vJ vJ W W -Maa 28 11 11 I I :Ill A October 27, 2016 et' Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Sheet 3 Legend County Boundary Proposed Potable Water Line (Duke) Proposed Service Lines (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands Duke Energy Plant Railway Stream/Lake Recommended Individual Filtration System ® Parcel Reference Number (Refer to spreadsheet for parcel details) -X+ 1 in = 200 feet 0 200 400 Feet U (3� �41 FA October 27, 2016 Met ' Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Sheet 4 Legend County Boundary Proposed Potable Water Line (Duke) Proposed Service Lines (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands + Duke Energy Plant Railway Stream/Lake Recommended Individual Filtration System ® Parcel Reference Number (Refer to spreadsheet for parcel details) N 1 in = 200 feet 0 200 400 Feet October 27, 2016 et' Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Sheet 5 Legend County Boundary Proposed Potable Water Line (Duke) Proposed Service Lines (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands + Duke Energy Plant Railway Stream/Lake Recommended Individual Filtration System Parcel Reference Number (Refer to spreadsheet for parcel details) N 1 in = 200 feet 0 200 400 Feet October 27, 2016 et' Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Sheet 6 Legend County Boundary Proposed Potable Water Line (Duke) Proposed Service Lines (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands + Duke Energy Plant Railway Stream/Lake Recommended Individual Filtration System ® Parcel Reference Number (Refer to spreadsheet for parcel details) N 1 in = 200 feet 0 200 400 Feet If �� - }� Ji;fAlr �' a�' 7�'Co-�E' •�...� $ � F t'• ;i. .Yt � "y' _ _ '_ � _, ,. ' -Iwo' vo _ :F1 ; 4 ♦ .. - �' ' - _ � � !;ems � f _ �e r 01 os 7, 0 w .• { �_• 41 041 October 27, 2016 et' Dewberry - Duke Energy Dewberry Proj. No. 50081778 Proposed Potable Water Site Preliminary Evaluation Mayo Steam Station Sheet 7 Legend County Boundary Proposed Potable Water Line (Duke) Proposed Service Lines (Duke) Compliance Boundary 1/2 Mile Buffer Compliance Boundary Existing Potable Water Line (City of Roxboro) Wetlands + Duke Energy Plant Railway Stream/Lake Recommended Individual Filtration System ® Parcel Reference Number (Refer to spreadsheet for parcel details) 1 in = 200 feet 0 200 400 Feet Appendix B: Mayo Station Household Data Spreadsheet www.dewberry.com Mayo Steam Station Parcel Spreadsheet Label Parcel ID # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 1738 1746 2742 2787 2815 2881 2882 2883 2937 2952 2953 21470 21473 23621 23622 23623 23624 23625 23626 23627 23628 23629 23630 23631 23632 3365-24410 3365-27009 3365-22883 3365-24411 3375-18624 3365-27033 3365-27032 3365-7856 3365-26196 3365-26194 3365-7855 3365-17400 3366-7808 11969/11939 12015 10475 369 682 582 206 236 209 153 77 12013/12089 2093 12102 3967 1025 1025 11243 11243 11243 1044 1022 11167 Site Address BOSTON RD BOSTON RD MAYO LAKE RD OLD US 501 HWY MAYO LAKE RD BOSTON RD BOSTON RD BOSTON RD BOSTON RD MULLINS LN OLD US 501 HWY OLD US 501 HWY OLD US 501 HWY MULLINS LN MULLINS IN MULLINS LN MULLINS LN MULLINS LN MULLINS IN MULLINS LN MULLINS LN MULLINS LN MULLINS LN MULLINS LN OLD US 501 HWY BOSTON RD BOSTON RD BOSTON RD 9TH LANE WOODY LOOP WOODY LOOP HUELL MATTHEWS HWY HUELL MATTHEWS HWY HUELL MATTHEWS HWY WOODY LOOP WOOD LOOP HUELL MATTHEWS HIGH 39 3366-26301 1022 WOODY LOOP North of Plant/ City Water South of Plant Northern Northern Northern Southern Northern Northern Northern Northern Southern yes Southern Southern Southern Southern Southern Southern Southern Southern Southern Southern Southern Southern Southern Southern Southern Southern Northern Northern Northern Northern Northern Northern Northern Northern Northern Northern Northern Northern Northern Northern Type of Service Business, Office, Factory w/o showers N/A Residential N/A N/A N/A N/A Residential N/A Residential Residential Residential N/A Residential Residential N/A N/A N/A N/A N/A Residential Residential N/A Residential N/A N/A Residential Residential Residential N/A N/A Residential N/A Residential N/A Residential N/A Residential Residential EasementRequired Land Use Owner Tax Address City State In Use STARLITES TECHNOLOGY INC 66 LILY MCCOY LN 0 Empty Lot EASTWOOD HOWARD L & DONNA W 309 EASTWOOD LONG LN 0 In Use MERRITTJOHN H III 3967 9TH LN 0 Empty Lot FLORES FELIPE & MARTHA 582 OLD US 501 0 Empty Lot PEED DOYLE & PEED DURWOOD 428 BETHEL HILL SCHOOL RD 0 Empty Lot EASTWOOD HOWARD L & DONNA W 309 EASTWOOD LONG LN 0 Empty Lot EASTWOOD HOWARD L & DONNA W 309 EASTWOOD LONG LN 0 In Use EASTWOOD HOWARD L & DONNA W 309 EASTWOOD LONG LN 0 In Use LOUISIANA PACIFIC CORPORATION 10475 BOSTON RD//RICK MILLER 0 In Use SHEETS CHARLES DAVIS 369 MULLINS LN Yes 480 In Use FLORES LENOR & ALFREDO ANAYA 682 OLD US 501 480 In Use FLORES FELIPE & MARTHA 582 OLD US 501 480 Empty Lot FLORES FELIPE & MARTHA 582 OLD US 501 0 In Use CLAYTON KEITH W 206 MULLINS LN Yes 480 In Use WOMACK MICHAEL DEAN 236 MULLINS LN Yes 480 Empty Lot SEYMOUR MARY LINK 230 LESTERS WAY Yes 0 Empty Lot SHEETS CHARLES DAVIS 369 MULLINS LN Yes 0 Empty Lot MAILLETJOSEPH &JEAN 841 PAMELA DR Yes 0 Empty Lot KEE GWENDOLYN M 4133 NE W 67TH TER Yes 0 Empty Lot JONES BONNIE L & LARRY V 4 PAGE MORE CT Yes 0 In Use DMG PROPERTIES LLC/Timothy Barwick 119 S MADISON BLVD Yes 480 In Use SERRANT WALTER G 153 MULLINS LN Yes 480 Empty Lot POOLE EARL D EST 630 PROVIDENCE RD Yes 0 In Use JONES MICHAEL D 77 MULLINS LN Yes 480 Empty Lot THOMAS EUNICE & CARLTON THOMAS 682 OLD US 501 0 Empty Lot TINGEN, KEVIN MORTON P.O.BOX 12580 0 In Use REAVES, LAURIE S P 0 BOX 997 0 In Use SLAUGHTER, LAURIE A P O BOX 997 0 In Use TINGEN, KEVIN MORTON P.O.BOX 12580 0 Empty Lot MERRITT, JOHN H III 3967 9TH LANE 0 Empty Lot WOODY, FREDDIE R. 1025 WOODY LOOP 0 In Use WOODY, MARY B 1025 WOODY LOOP 0 Empty Lot WILBORN, WILLIAM J SR & BRENDA L 11243 HUELL MATTHEWS HWY 0 In Use WILBORN, WILLIAM J. SR. 11243 HUELL MATTHEWS HWY 0 Empty Lot WILBORN, WILLIAM J SR & BRENDA L 11243 HUELL MATTHEWS HWY 0 In Use JOHNSON, ADDISON JR. & DIANNE G. P 0 BOX 3463 0 Empty Lot WILKINS, CHARLES P OR 1022 WOOD LOOP 0 In Use BROWN, KAY M 11167 HUELL MATTHEWS HIGH 0 In Use WILKINS, CHARLES P & NELLIE W 1022 WOODY LOOP 0 Req' Daily Flow Other Notes Recommended Individual Gallons/shift Filtration System #N/A Gallons/connection Recommended Individual Filtration System #N/A #N/A #N/A #N/A Gallons/connection Recommended Individual Filtration System #N/A Gallons/connection Gallons/connection Gallons/connection #N/A Gallons/connection Gallons/connection #N/A #N/A #N/A #N/A #N/A Gallons/connection Gallons/connection #N/A Gallons/connection #N/A #N/A Gallons/connection Recommended Individual Filtration System Gallons/connection Recommended Individual Filtration System Gallons/connection Recommended Individual Filtration System #N/A #N/A Gallons/connection Recommended Individual Filtration System #N/A Gallons/connection Recommended Individual Filtration System #N/A Gallons/connection (3) Recommended Individual Filtration System #N/A Gallons/connection (2) Recommended Individual Filtration System Gallons/connection Recommended Individual Filtration System Appendix C: Schedule www.dewberry.com Name Start Finish ter I4th,Quarter Ilst 2nd, Quarter 13rd ,Quarter 14th ,Quarter 11st 3rd 4th 1 Mayo DEQ Report Submittal & Approval Thu 12/15/16 Sun 1/15/17 Municipality/County Negotiation & Agreement Mon 11/14/16 Fri 2/10/17 Municipality/County Design Agreement Period Mon 11/14/16 Fri 2/10/17 Municipality/County System Design (assuming NTP within 30 days of Mon 2/20/17 Wed 8/23/17 agreement) Field Work/Survey Mon 2/20/17 Tue 3/21/17 30% Design Development Wed 3/22/17 Fri 4/28/17 Development of 30% Construction Documents Wed 3/22/17 Fri 4/21/17 Review of 30% Design Mon 4/24/17 Fri 4/28/17 30% Design Review Meeting Fri 4/28/17 Fri 4/28/17 60% Design Development Mon 5/1/17 Fri 6/23/17 Development of 60% Construction Documents Mon 5/1/17 Fri 6/9/17 Review of 60% Design Mon 6/12/17 Fri 6/23/17 60% Design Review Meeting Fri 6/23/17 Fri 6/23/17 Final Design Development Mon 6/26/17 Fri 8/4/17 Development of 100% Construction Documents Mon 6/26/17 Tue 7/25/17 Review of 100% Design Wed 7/26/17 Fri 8/4/17 100% Design Review Meeting Fri 8/4/17 Fri 8/4/17 Easement Development Mon 5/1/17 Wed 8/23/17 Deed Research Mon 5/1/17 Tue 5/30/17 Develop Plats Mon 6/26/17 Tue 7/25/17 Easement Acquisition Wed 7/26/17 Wed 8/23/17 Permitting Mon 8/7/17 Fri 11/17/17 NC EM&L E&S Control Permit Mon 8/7/17 Fri 10/6/17 NCDOT Encroachment (State and District) Mon 8/7/17 Fri 10/27/17 Authorization to construct a public water supply Mon 8/7/17 Fri 11/17/17 Advertise, Bidding & Contracting Mon 11/20/17 Fri 2/16/18 NTP Fri 2/16/18 Fri 2/16/18 Construction of Water Main & Services Mon 2/19/18 Fri 7/20/18 Substantial Completion, System Testing, & Certification Mon 7/23/18 Tue 8/21/18 project Completion Tue 8/21/18 Tue 8/21/18 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Project: Mayo Steam Station Manual Summary Rollup Proposed Schedule 2/16 8/21 Page 1 Appendix D: Opinion of Probable Cost www.dewberry.com FINAL Opinion of Probable Cost Mayo Steam Station Potable Water Connection Item I Material Unit QQt y Unit Cost Extended Cost Main 1 6-inch DI Pipe LF 5,600 $ 15.00 $ 84,000 2 6-inch Tee EA 2 $ 850 $ 1,700 3 6-inch Gate Valve w/Box (assume three at every tee and one per 5,000 LF) EA 8 $ 750 $ 6,000 4 Misc Fittings (Assume 2 fittings per appurtenance plus 1 fitting per 1000 LF pipe times 80# per fitting) LB 1,800 $ 4.00 $ 7,200 5 Automatic Flushing Devices EA 2 $ 8,000 $ 16,000 6 Fire Hydrant EA 3 $ 6,000 $ 18,000 7 1-inch Air Release Valve and Manhole (at highpoints in main) EA 1 $ 2,200 $ 2,200 Subtotal Materials/Equipment: $ 135,100 Installation (% of Material/Equipment): 30% $ 40,600 8 Clearing & Grubbing LF 5,600 $ 3.50 $ 19,600 9 Excavation and Backfilling for Trench LF 5,600 $ 18.00 $ 100,800 10 Pipe Bedding Material (#67 Stone - assumed for 25% of pipe) CY 130 $ 35.00 $ 4,600 11 Rock Excavation CY 519 $ 200.00 $ 103,800 12 Railroad Crossing (Casing, Piping, Spiders and Installation) EA 0 $ 50,000 $ - 13 Rural Road Crossing for Main (Casing, Piping, Spiders and Installation) EA 3 $ 20,000 $ 60,000 14 Erosion Control Measures (Silt Fence/Check Dams based on feet of pipe) LF 5,600 $ 4.50 $ 25,200 15 Testing, Disinfection, Clean Up, Seed and Mulch (Assume: 25-ft impacted area) LF 5,600 $ 8.50 $ 47,600 16 Connection to Existing Waterline EA 1 $ 5,000 $ 5,000 17 Traffic Control LS 1 $ 15,000 $ 15,000 Services Connections/Lines 18 2-inch PVC Pipe LF 0 $ 4.75 $ - 19 3/4-inch PVC Pipe LF 2,300 $ 3.00 $ 6,900 20 Misc Fittings for Service Connections (valves, fittings, etc.) EA 8 $ 300 $ 2,400 Subtotal Materials/Equipment: $ 9,300 Installation (% of Material/Equipment): 30% $ 2,800 21 2-inch Services Taps, Meters, Meter Boxes and Misc. Connections to Main Line EA 0 $ 6,000 $ - 22 3/4-inch Services Taps, Meters, Meter Boxes and Misc. Connections to Main Line EA 8 $ 3,000 $ 24,000 23 Road Crossing for Services - (Jetting/bore, Casing, and Installation) EA 2 $ 1,500 $ 3,000 24 Excavation and Backfilling for Service Trench LF 2,300 $ 10.00 $ 23,000 25 Flush, Clean Up, Seed and Mulch (Assume: 5-ft impacted area) LF 2,300 $ 4.00 $ 9,200 SUBTOTAL $ 629,000 Sub -Total FOB Allowance (% of Material/Equipment): 2% $ 3,000 Renovation Allowance (% of Material/Equipment): 5% $ 8,000 Sub -Total $ 640,000 Contractor Overhead and Profit: 15% $ 96,000 Contractor General Conditions: MONTH 6 $ 20,000 $ 120,000 Sub -Total: $ 856,000 Contingency: 25% $ 214,000 Sub -Total: $ 1,070,000 Design, Bid Phase, and Construction Phase Engineering Services 10% $ 107,000 Easements Acquistion (Permanent) $ 20,000.00 $ 20,000 TOTAL ESTIMATED CAPITAL COST: $ 1,200,000 Notes: 1.) Renovation Allowance to account for private property refurbishment (signs, fences, etc.) 2.) Number of Service Taps taken from field evaluation and property records. 3.) Permanent Easement Acquisition based on 50% of average area property tax value 4.) Temporary easements are not included in this estimate. 5.) No significant water crossings, wetlands, or other abnormal working environment included. 6.) Opinion of Probable Cost dated October 2016; cost may vary depending upon escalation at time of construction. 7.) Piping footage may change with final design. 10/25/2016 FINAL Dewberry