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HomeMy WebLinkAboutNC0087891_Application_20040416pKp@j MCI rbr�A F -JMc Gill A S S O C I A T E S April 16, 2004 Mr. Tom Belnick North Carolina Department of Environment, and Natural Resources Division of Water Quality/NPDES Unit 512 North Salisbury Street Raleigh, North Carolina 27604 Dear Mr. Belnick: - APR 2 0 2004 RE: East Yancey Water and Sewer District Re -Submittal of NPDES Permit Application and Engineering Alternatives Analysis Yancey County, North Carolina In response to the NPDES permit application / NCO087891, Return No. 2210; please find enclosed three (3) revised copies of the NPDES permit application form and Engineering Alternatives Analysis (EAA) for the above referenced project. Please note that the original application has been resubmitted because the request for a permit to discharge 400,000 gallons per day to the South Toe River remains unchanged. In accordance with our recent telephone conversation, we offer the following responses to your letter dated March 8, 2004 (numbered to coincide with your numbered comments): 1. The 50% connection rate is based on random community septic system surveys that were completed by McGill Associates within the District, and discussions with the Toe River Health Department. Though the Health Department has not provided any data on the current number of failing systems in the District, a letter from the Department is included in Appendix A of the EAA describing permit denials and the potential for future problems in the area. The results of the community surveys are discussed on pages 5 and 6 of the enclosed EAA. Based on this information, the 50% connection rate appears to be a reasonable estimate. 2. As we discussed on the telephone, the flow projections in the EAA have been revised to follow Constriction Grants and Loans (CG&L) guidelines for 201 Facilities Plans. Since these guidelines do not include infiltration and inflow (I/1), additional estimates for 1/I have been included in the flow projections. Please note that these revised calculations do not affect the District's request for a permit to discharge 400,000 gallons per day (GPD). 3. The costs associated with the unit pricing in Table III -I are based on previous bid tabulations and comparisons to construction costs of similar projects completed within the State of North Carolina. Mobilization has been estimated at approximately 3% of the total estimated construction cost. Engineering • Planning • Finance McGill Associates. P.A. • P.O. Box 2259, Asheville, NC 28802 • 55 Brood Street. Asheville, NC 28801 828-252-0575 • FAX 828-252-2518 Mr. Tom Belnick a April 16, 2004 Page 2 4. In Alternative No. 2, the Town of Burnsville would implement a one-time capacity depletion charge to the District in addition to monthly user fees for treatment of the wastewater. A letter dated April 14, 2004 from Mr. Tom Storie, Director of Public Works, is included in Appendix A of the EAA. Mr. Storie confirms the capacity depletion charge of $3.00 per gallon (not $3.00 per 1,000 gallons as indicated in the previous EAA). Additional information on the capacity depletion charge and monthly user fees is included on pages 19 and 21 of the EAA. 5. An evaluation of utilizing a community subsurface system in the District has been added to the EAA, including cost estimates. See pages 25 through 31 of the enclosed EAA. 6. Please note that the Table III-3 that you referenced in your letter is now Table III-6 in the enclosed revised EAA. The costs associated with the unit pricing in Table III-6 are based on previous bid tabulations and comparisons to construction costs of similar projects completed within the State of North Carolina. Mobilization has been estimated at approximately 3% of the total estimated construction cost. 7. Please note that the Table III-4 that you referenced in your letter is now Table III-7 in the enclosed revised EAA. The costs associated with the unit pricing in Table III-7 are based on previous bid tabulations and comparisons to construction costs of similar projects completed within the State of North Carolina. Mobilization has been estimated at approximately 3% of the total estimated construction cost. 8. The District has secured funding to construct the Phase 1 collection system improvements and a new wastewater disposal facility. Based on engineering estimates, the available funding will allow the District to construct a wastewater treatment plant with a capacity of 150,000 GPD. Though flows in Phase 1 are estimated to be only 53,000 GPD, the new WWTP is proposed to be a dual train system, giving the District the flexibility of treating the flows with just one train in service. Construction of a facility larger than 150,000 GPD does not appear to be economically feasible at this time due to lack of funding. The District has secured a portion of funding for the Phase 2 improvements, and is seeking funding for the remainder of the balance. The Phase 2 project is proposed to expand the 150,000 GPD facility constructed in Phase 1 to a capacity of 400,000 GPD. 9. Mr. Curtis Weaver of the United States Geological Survey provided information relating to the 7Q10 and 30Q2 flows of the South Toe River included in the EAA. 10. Please note that the Table III-6 that you referenced in your letter is now Table III-9 in the enclosed revised EAA. The costs associated with the unit pricing in Table III-9 are based on previous bid tabulations and comparisons to construction costs of similar projects completed within the State of North Carolina. Mobilization has been estimated at approximately 3% of the total estimated construction cost. Mr. Tom Belnick April 16, 2004 Page 3 The cost for the wastewater treatment plant in Table III-9 ($652,500) includes the total construction cost in Table III-6 ($690,100) minus disinfection, the outfall line to the river, and mobilization (3% mobilization is added to the total project cost in Table III-9). This issue is discussed on page 41 of the EAA. 11. Please note that the Table III-7 that you referenced in your letter is now Table III-10 in the enclosed revised EAA. The costs associated with the unit pricing in Table III-10 are based on previous bid tabulations and comparisons to construction costs of similar projects completed within the State of North Carolina. Mobilization has been estimated at approximately 3% of the total estimated construction cost. 12. Please note that the Table III-9 that you referenced in your letter is now Table III-12 in the enclosed revised EAA. The costs associated with the unit pricing in Table III-12 are based on previous bid tabulations and comparisons to construction costs of similar projects completed within the State of North Carolina. Mobilization has been estimated at approximately 3% of the total estimated construction cost. The cost for the secondary wastewater treatment plant in Table III-12 ($562,500) includes the total construction cost in Table III-6 ($690,100) minus tertiary treatment, disinfection, the outfall line to the river, and mobilization (3% mobilization is added to the total project cost in Table III-12). This issue is discussed on page 46 of the EAA. 13. Please note that the Table III-10 that you referenced in your letter is now Table III-13 in the enclosed revised EAA. The costs associated with the unit pricing in Table III-13 are based on previous bid tabulations and comparisons to construction costs of similar projects completed within the State of North Carolina. Mobilization has been estimated at approximately 3% of the total estimated construction cost. Tom, we hope that this letter and the enclosed EAAs respond to your comments in a satisfactory manner. Should you have any additional questions, please do not hesitate to give me a call. We look forward to your review of this important application. Sincerely, McGILL ASSOCIATES, P.A. Id.- a J, *Ae MICHAEL S. APKE, P.E. Project Engineer Enclosures cc: Michele Lawhern (w/ enclosures) Harry Buckner, P.E. Projects/2001 /01743/npdespermit/letters/tb 16apr4.doc pw � rm 9"a m PWR V" fm m" ENVIRONMENTAL ALTERNATIVES ANALYSIS TO EVALUATE WASTE DISPOSAL ALTERNATIVES FOR EAST YANCEY WATER AND SEWER DISTRICT YANCEY COUNTY, NORTH CAROLINA MICHAEL S. APKE, P.E. OMcGH1 ASSOCIATES Engineering • Planning • Finance Post Office Box 2259 Asheville, North Carolina 28802 JANUARY, 2004 REVISED APRIL, 2004 01743 SEAS. • 27394 �/41HtfiiM^A'f� M SECTION I GENERAL INFORMATION The East Yancey Water and Sewer District is located in the mountains of western North Carolina, southeast of the Town of Burnsville. The District encompasses nearly 4,000 acres of land in the Micaville and Windom communities, and was created to provide an area wide collection system to portions of the county without current reliable water and sewer service. The District recently received a grant in the amount of $3,000,000 from the North Carolina Rural Economic Development Center's Unsewered Communities Program to construct the first phase of the wastewater collection and disposal system in this area. Yancey County currently owns approximately eleven (11) acres of land along the banks of the South Toe River and has designated the property as the proposed site for wastewater disposal within the area. This tract of land is situated north of US 19 E, and can be accessed from Wyatt Town Road (SR 1307). A location map of the District boundaries and the 11-acre tract of land are included in Figure I-1 at the end of this section. This study evaluates alternatives for the treatment and disposal of wastewater generated from within the District and is based on the assumption that costs to expand the collection system, and to connect new consumers, are similar in price and scope for each viable treatment option. Treatment alternatives have been evaluated on an estimated construction cost basis as well as a present worth basis over a twenty-year operations 1 MR � t period, and have been conducted in accordance with North Carolina Division of Water Quality (NCDWQ) guidelines. am The alternatives that have been evaluated are as follows: IM �,., • Alternative No. 1 - No Action • Alternative No. 2 - Connection to a Publicly Owned Treatment Works • Alternative No. 3 - Connection to a Privately Owned Treatment Works Alternative 3 A — Connection to Mountain View Motel Treatment Works Alternative 3-B — Connection to Taylor Togs Treatment Works • Alternative No. 4 — Individual and Community Subsurface Systems '�'" • Alternative No. 5 — Surface Water Discharge Through NPDES Permit System • Alternative No. 6 — Drip Irrigation • Alternative No. 7 — Spray Irrigation �'" • Alternative No. 8 — Reuse P" ow �, 2 rig r r r FIGURE 1-1 PROJECT LOCATION MAP EAST YANCEY WATER & SEWER DISTRICT S I_ j P�0�O [);' VVH.z'I CVVN I rm,-� - { DISPOSACSR(E ZA r ti r l s Ise .I \., •J/ YANCEY COUNTY / J 'r, 'AST Y EY BORDER l 1 1 AT—EW&�EWI� DIS cp N SCALE: V= 15,000' \ @McGiff A S S O C I A T E S - ENGINEERINGPLANNINGFINANCE 55 BROAD STREST ASHE VII.I.E. NC PH-(KM252-05]5 SECTION II DESCRIPTION OF NEEDS me "" The service area created by the East Yancey Water and Sewer District currently MR includes approximately 490 homes and 34 businesses and institutions. The most current U.S. census figures indicate that the population of the service area consists of approximately 2.36 persons per household. Therefore, the population in 2003 within the service area is estimated at 1,156 persons. Information from the 2000 Census indicates that, during the decade from 1990 to 2000, Yancey County experienced an increase in population of 2,355 persons countywide, to a total population of 17,774. This represents a 15.3% growth rate over that period, or an effective rate of 1.43% per year. For the purposes of this report, it is assumed that the population growth rate within the service area will be similar to that of the preceding decade, therefore an annual rate of 1.43% has been used to project future growth. Table II-1 indicates an incremental growth rate within the service area over the twenty-year planning period of this study based on this assumption. Table II-1 EAST YANCEY WATER AND SEWER DISTRICT we SERVICE AREA POPULATION PROJECTIONS SM an .e v-aa _ -r�s^f t yyyy "3 S�F. � -�.�µm �� � � Y �.P'g�Y;i� a s. 'aF y _c{.x ] '�.-q" ey •r f ?.�,.! �� W� �� �,:1.. 3��.I �f:r.,+ � ssxti - .uifijif.t ..""^jy,�.t,;.�yjj`+ .f`I'xFj""lrti R'41� �„ .. '^7� �...:_. �• ��� �t i��T; �.q.N.mzv$-•w-�i.` FlitE.,-ti« 1,156 r'Tyt�'i�i M � u 't'"R��� �f f'f s �! i:. i1��� • ia1� ,�.�ri ��J �-j:!'+��:i Tt i=.�, � 2003 2006 (Project Beginning) 11,206 2010 1,276 2015 1,371 2020 1,472 2025 1,580 oft 3 Due to the large area encompassed by the District, it is not cost effective to serve M the entire area within the scope of one project. The most efficient manner to serve the entire District with sewer service is to use a phased approach, as population density and service needs vary widely across the area. A total of six (6) potential phases have been identified to ultimately extend service to the entire District, with implementation preliminarily scheduled to take up to twenty (20) years. The intended twenty-year phased planning period requires the initial Phase 1 construction of a collection system and disposal facility to act as the foundation of the collection system and future phases. I" Figure II-1 shows the location of the six (6) phases proposed for this project. aw Table II-2 summarizes the number of potential residential connections in 2003 in am each of the six phases, and the year that the phase is proposed to be constructed. These connections will be utilized to calculate anticipated wastewater flows within the District. a" The District has already secured full funding for the Phase 1 improvements, and partial PM funding for the Phase 2 improvements. The remainder of the funding necessary for the Phase 2 improvements is currently being sought by the District. 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(828) 252-0575 M r Table II-2 EAST YANCEY WATER AND SEWER DISTRICT POTENTIAL RESIDENTIAL CUSTOMER BASE — YEAR 2003 TENTLAL Nltl4'1BE w PHASE DESCRIPTI N ' OF RESIDENTIAL .` Phase 1 - Micaville /Taylor Togs / Burnsville Elementary (2006) 172 Phase 2 - West Windom Area (2008) 74 Phase 3 - Georges Fork / Lower Georges Fork(2010) 98 Phase 4 - Cane Branch Road (2015) 70 Phase 5 - Bear Wallow Road (2020) 45 Phase 6 - SR 1147 / The Reserve (2025) 31 Note: District also includes an additional 34 potential non-residential customers As the wastewater collection system is constructed, connection to the system is not expected to be mandatory unless a property owner is required to connect by the County Health Department. It is therefore unrealistic to anticipate a 100 percent connection rate during each phase of construction, but it is anticipated that as the population of the area grows, the system is extended, and as property owners encounter problems with their individual septic systems, more customers will choose to connect to these facilities over time. ., It is currently estimated that 50 percent of the customers with service available to them will actually connect to the system. This estimation is based on random individual septic system surveys that were completed by McGill Associates within the District boundary in July 2002 as part of a grant application package submittal to the North Carolina Rural Economic Development Center's Unsewered Communities Program. 5 Following the Rural Center's requirements for these surveys, a minimum of I in 8 of the a` potential 524 units (in this case, 66 samples) were required to be surveyed. P" The surveys consisted of on -site visits and discussions with local property owners ' problems that theproperty . to determine the current condition of their septic systems, any p M* owner has experienced with the system, and the presence of any straight piping in the project area. A total of 72 surveys were conducted by McGill Associates within the District boundaries. In completing these surveys, 25 instances of grey water straight piping were confirmed (34.7% of surveys), 1 instance of a currently failing septic system was confirmed (1.4% of surveys), 6 cases of property owners who have experienced periodic problems with their systems were confirmed (8.3% of surveys), and 40 cases M, where property owners do not have an adequate repair area for their septic systems were confirmed (55.6% of surveys). oft „o It is anticipated that all property owners that are currently utilizing straight piping, me M or currently operating a failing system will be required to connect to the new system. Additional residents that have experienced problems with their systems or do not have an adequate repair area may also elect to connect to the system to avoid future problems. Based on this information, a 50 percent connection rate to the new system appears to be a reasonable estimate. In this report, future residential and commercial wastewater flows have been estimated using criteria published by the NCDWQ Construction Grants and Loans .e 6 can FM 00 im (CG&L) Section for State Revolving Fund (SRF) projects. These guidelines state that (f5o � future residential flows shall be calculated utilizing a rate of 70 GPD per capita, and future commercial flows shall be calculated using a rate of 15 GPD per capita. Industrial and institutional flows that are anticipated to be generated in the District have been .� estunated based on historical records and current NCDWQ criteria for determining o V1 Oe cP*") wastewater flows. The flow values utilized by CG&L do not include infiltration and inflow (I/I) that is typical to all gravity wastewater collection systems. According to the 3rd Edition of Wastewater Engineering by Metcalf and Eddy, I/I typically ranges from 100 to 10,000 gpd/inch-mile of pipe within a collection system. Since the gravity sewer lines proposed on this project will be newly constructed, I/I is expected to be minimal. An assumed I/I value of 100 gpd/inch-mile of pipe is therefore implemented into the flow calculations. The inch -miles of pipe were calculated for each of the six (6) Phases of the 20-year plan based on the collection system map shown in Figure II-1. The following sections provide a summary of the six (6) phases, and include wastewater flow projections for each phase. A summary table of the total flows generated by all phases is included at the end of this section. Phase I — MicavillelTaylor Togs/Burnsville Elementary The Phase 1 improvements will construct a collection system and disposal system to serve the US Highway 19 E corridor from the 11-acre disposal site to Burnsville 7 Elementary School, and along the NC Highway 80 corridor from the US 19 E am intersection to the Hickory Springs manufacturing plant. Based on the existing population in the area and the potential number of connections shown in Table II-2, residential/commercial flows in Phase 1 are estimated as follows: Residential Connections (2003) =172 Residential Connections (2006) = 179 (using 1.43% per year) 50% Connection Rate (2006) = 90 Residential Population (2006) = 90 connections X 2.36 people per connection (Based on 2000 Census Data) = 212 Total Residential/Commercial Flow = 212 people X (70 GPD/capita Residential + 15 GPD/capita Commercial)=18,020 GPD N" In addition, five (5) industries or institutions have committed to connecting to the a% new sewer system in Phase 1. These facilities include the Taylor Togs manufacturing facility, Hickory Springs industrial plant, two (2) elementary schools, and one (1) middle a" school. The Taylor Togs manufacturing facility is currently served by a 10,000 GPD f" package type wastewater treatment facility, and is planning to abandon the facility upon completion of the Phase 1 improvements. Wastewater flows for the Hickory Springs a" facility and three (3) schools have been estimated using NCDWQ criteria. The two (2) �* elementary schools are estimated using 12 GPD/student (day school with cafeteria), and the middle school is estimated using 15 GPD/student (day school with cafeteria, gym, and showers). Calculations for institution and school flows are as follows: +► Taylor Togs Industrial Facility=10,000 GPD (current capacity of WWTP) Hickory Springs Industrial Plant = 220 employees X 25 GPD/emp. = 5,500 GPD Micaville Elementary School = 235 students X 12 GPD/student = 2,820 GPD Burnsville Elementary School = 404 students X 12 GPD/student = 4,848 GPD East Yancey Middle School = 338 students X 15 GPD/student = 5,070 GPD Total Industrial/Institutional Flow = 28,238 GPD ,m 8 I/I that enters the collection system during Phase 1 is estimated as follows: Miles of 8-inch pipe = 2.52 miles = 20.16 inch -miles Miles of 12-inch pipe _ 4.18 miles 50.16 inch -miles Total inch -miles of pipe in Phase 1 (2006) = 70.32 inch -miles Total Infiltration = 70 inch -miles X 100 gpd/inch-mile of pipe = 7,032 GPD Total estimated flow generated in Phase 1 of the project is therefore: No 1.89020 GPD + 28,238 GPD + 7,032 GPD = 53,290 GPD Phase 2 — West Windom Area The Phase 2 improvements proposed in 2008, involve the construction and expansion of the collection and disposal systems constructed during Phase 1. The Phase 2 collection system is proposed to serve the US Highway 19 E corridor from Burnsville Elementary School to the OMC pump station at the edge of Burnsville Town Limits. Upon completion of these improvements, the OMC pump station is proposed to be abandoned, and the flow that currently enters the pump station will enter the new gravity "a collection system. According to existing flow records, approximately half of the Town of Burnsville's existing flow (0.231 MGD) currently enters the OMC pump station. However, this flow includes wastewater generated at the Burnsville Elementary School and East Yancey Middle School, which is proposed to be discharged into the District's �+ collection system during Phase 1. Therefore, with the construction of the Phase 2 collection system, the wastewater flows from the OMC pump station can be estimated as follows: X" Oft 9 am ON Existing P OMC Pump Station flow = 231 000 GPD Burnsville Elementary School = (- 4,848 GPD) �u/ s►�� East Yancey Middle School = (- 5,070 GPD) al►�e Total Flow From OMC Pump Station = 231,000 - 4,848 - 5,070 = 221,082 GPD Based on the existing population in the area and the potential number of connections shown in Table II-2, residential/commercial flows in Phase 2 are estimated as follows: Residential Connections (2003) = 74 Residential Connections (2008) = 79 (using 1.43% per year) 50% Connection Rate (2008) = 40 Residential Population (2008) = 40 connections X 2.36 people per connection (Based on ,.. 2000 Census Data) = 94 Total Residential/Commercial Flow = 94 people X (70 GPD/capita Residential + 15 GPD/capita Commercial) = 7,990 GPD I/I that enters the collection system during Phase 2 is estimated as follows: Miles of 8-inch pipe = 0.90 miles = 7.20 inch -miles Miles of 12-inch pipe =1.29 miles =15.48 inch -miles Total inch -miles of pipe in Phase 2 (2008) = 22.68 inch -miles Total Infiltration = 22.68 inch -miles of pipe X 100 gpd/inch-mile of pipe = 2,268 GPD Total estimated flow generated in Phase 2 of the project is therefore: 0" 221,082 GPD + 7,990 GPD + 2468 GPD = 231,340 GPD go Phase 3 — Georges Fork and Lower Georges Fork "" The Phase 3 improvements proposed in 2010, involve the construction of a MR gravity sewer collection system along the George's Fork and Lower George's Fork Roads. The gravity collection system is proposed to connect to the collection system OR constructed during Phase 1 along US Highway 19 E and will primarily serve residential areas. Based on the existing population in the area and the potential number of AM 10 Mob O Im connections shown in Table II-2, residential/commercial flows in Phase 3 are estimated as follows: Residential Connections (2003) = 98 Residential Connections (2010) =108 (using 1.43% per year) 50% Connection Rate (2010) = 54 Residential Population (2010) = 54 connections X 2.36 people per connection (Based on 2000 Census Data) = 127 Total Residential/Commercial Flow = 127 people X (70 GPD/capita Residential + 15 GPD/capita Commercial)=10,795 GPD I/I that enters the collection system during Phase 3 is estimated as follows: r Miles of 8-inch pipe = 2.25 miles =18 inch -miles ,.., Total Inch -miles of pipe in Phase 3 (2010) =18 inch -miles Total Infiltration =18 inch -miles of pipe X 100 gpd/inch-mile of pipe =1,800 GPD Total estimated flow generated in Phase 3 of the project is therefore: 10,795 GPD + 19800 GPD=12,595 GPD OR Phase 4 — Cane Branch Road so The Phase 4 improvements proposed in 2015, involve the construction of a go gravity sewer collection system along Cane Branch Road. The gravity collection system is proposed to connect to the collection system constructed during Phase 1 along US Om Highway 19 E and will serve several residential areas. Based on the existing population in the area and the potential number of connections shown in Table II-2, residential/commercial flows in Phase 4 are estimated as follows: MW on Residential Connections (2003) = 70 ON Residential Connections (2015) = 83 (using 1.43% per year) 50% Connection Rate (2015) = 42 Residential Population (2015) = 42 connections X 2.36 people per connection (Based on Ow 2000 Census Data) = 99 Total Residential/Commercial Flow = 99 people X (70 GPD/capita Residential + 15 GPD/capita Commercial) = 8,415 GPD I/I that enters the collection system during Phase 4 is estimated as follows: Miles of 8-inch pipe = 1.65 miles = 13.20 inch -miles Total Inch -miles of pipe in Phase 4 (2015) =13.20 inch -miles Total Infiltration =13 inch -miles of pipe X 100 gpd/inch-mile of pipe =1,320 GPD FM Total estimated flow generated in Phase 4 of the project is therefore: 81415 GPD + 11320 GPD = 9,735 GPD No Phase 5 — Bear Wallow Road M The Phase 5 improvements proposed in 2020, involve the construction of a gravity sewer collection system along Bear Wallow Road. The gravity collection system is proposed to connect to the collection system constructed during Phase 1 along US Highway 19 E and will serve several residential areas. Based on the existing population in the area and the potential number of connections shown in Table II-2, no residential/commercial flows in Phase 5 are estimated as follows: Residential Connections (2003) = 45 Residential Connections (2020) = 57 (using 1.43% per year) 50% Connection Rate (2020) = 29 Residential Population (2020) = 29 connections X 2.36 people per connection (Based on 2000 Census Data) = 68 Total Residential/Commercial Flow = 68 people X (70 GPD/capita Residential + 15 GPD/capita Commercial) = 5,780 GPD ON 12 r•� I/I that enters the collection system during Phase 5 is estimated as follows: T6- Miles of 8-inch pipe =1.44 miles = 11.52 inch -miles Total inch -miles of pipe in Phase 5 (2020) = 11.52 inch -miles „+ Total Infiltration = 11.52 inch -miles of pipe X 100 gpd/inch-mile of pipe =1,152 GPD Im A. an Total estimated flow generated in Phase 5 of the project is therefore: 59780 GPD + 1,152 GPD = 6,932 GPD Phase 6 — The Reserve The Phase 6 improvements proposed in 2025, involve the construction of a gravity sewer collection system along SR 1147 (The Reserve). The gravity collection system is proposed to connect to the collection system constructed during Phase 1 along US Highway 19 E and will serve several residential areas. Based on the existing population in the area and the potential number of connections shown in Table II-2, residential/commercial flows in Phase 6 are estimated as follows: Residential Connections (2003) = 3 1- Residential Connections (2025) = 42 (using 1.43% per year) 50% Connection Rate (2025) = 21 Residential Population (2025) = 21 connections X 2.36 people per connection (Based on. � 2000 Census Data) = 50 Total Residential/Commercial Flow = 50 people X (70 GPD/capita Residential + 15 GPD/capita Commercial) = 4,250 GPD I/I that enters the collection system during Phase 6 is estimated as follows: Miles of 8-inch pipe = 1.79 miles = 14.32 inch -miles Total inch -miles of pipe in Phase 6 (2025) = 14.32 inch -miles Total Infiltration = 14.32 inch -miles of pipe X 100 gpd/inch-mile of pipe =1,432 GPD "" Total estimated flow generated in Phase 6 of the project is therefore: 41250 GPD + 19432 GPD = 5,682 GPD am TMO 13 FM PM MR rMM go MM oft O� �i Table II-3 summarizes the estimated wastewater flows during the twenty-year phased planning period. The table assumes a growth rate of 1.43% per year, and adds flows due to connections anticipated during each of the phased projects outlined above. TABLE II-3 PROJECTED AVERAGE DAILY WASTEWATER FLOWS EAST YANCEY WATER AND SEWER DISTRICT YEAR FLOW (in Gallons Per Day) FLOW ADDED DURING PHASED CONSTRUCTION TOTAL FLOW WITH (1.43% ANNUAL GROWTH RATE) 2006 - Phase 1 53,290 53,290 - 2007 -- - -- 2008 - Phase 2 231,340 ,165 j 2009 2903,257 2010 - Phase 3 12,595 3073,003 2011 3111,393 2012 3155846 2013 3203,362 2014 324,944 2015 - Phase 4 9,735 3392325 2016 3441178 2017 3495,099 2018 3543,092 2019 3593,155 2020 - Phase 5 61,932 3711,223 2021 3763,531 2022 3813,942 2023 3873,404 2024 3922917 2025 -Phase 6 53,682 04,213 14 Za0 452 �y 5-LS ,9,9 c 7011 t7 72/007, 13,031 BV611 �S' 009 b61-LIS 87,4Sb 8a 708 Q6t� Jq I tl-zl 5 99,710'1:� Io1,1Z6 jd2,S72. 109,72I aPd. SECTION III WASTEWATER TREATMENT ALTERNATIVES The following is a discussion of the wastewater treatment alternatives available to IM the East Yancey Water and Sewer District. Included in this discussion are estimates of the capital costs of each alternative as well as a present worth analysis for the twenty-year MR planning period. The costs will be used to compare the various alternatives, and to make recommendations for wastewater disposal within the District. ALTERNATIVE NO. 1— NO ACTION This alternative consists of no action being taken by the East Yancey Water and Sewer District to provide wastewater treatment for the entire District. Without an adequate method of wastewater disposal, the District would be unable to provide sewer service to hundreds of residences and businesses. The residences and businesses would therefore continue to use unreliable subsurface disposal systems to dispose of wastewater. The development of the Water and Sewer District is expected to provide significant economic growth to Yancey County by providing infrastructure for residents, industries, FRI and commercial businesses. In order to allow for this growth, and eliminate the existing environmental concerns associated with the septic systems in use in the area, it is in the best interest of the County to provide a method of wastewater disposal. Alternative No. 1 is therefore not a feasible alternative and will not be discussed in further detail. No am OM 15 ALTERNATIVE NO. 2 — CONNECTION TO A PUBLICLY OWNED TREATMENT WORKS The Town of Burnsville's wastewater collection system is the only public sanitary sewer system with a wastewater treatment plant (WWTP) located within a five (5) mile radius of the East Yancey Water and Sewer District. The Town is located to the west of No the District and operates a wastewater collection system and treatment facility that has a permitted capacity to discharge 0.80 MGD of treated effluent into the Cane River. MR No Due to the natural topography of the area, connection to the Town of Burnsville's collection system with a gravity sewer system is not feasible. Preliminary hydraulic so calculations indicate that this alternative would require the construction of at least two (2) �., lift stations and would also require upgrades to the Town of Burnsville's existing collection system and OMC lift station. In this alternative, the existing 0.231 MGD of MR wastewater currently being pumped by the OMC lift station to the Town of Burnsville would continue to be collected and pumped in the same manner. Due to the substantial length of force main necessary to construct these improvements, all facilities are assumed to initially be designed to accommodate the projected 20-year flows in the District. MR The first lift station is proposed to be located on the 11-acre tract of land off of Wyatt Town Road that is owned by the County. This lift station would transfer wastewater through a 6-inch force main to an additional lift station located at the Burnsville Elementary School. The Burnsville Elementary School lift station would then transfer wastewater through an additional 6-inch force main into the existing OMC lift RM ,�, 16 station located at Burnsville Town limits. MR OW Due to the existing capacity of the OMC lift station and the twenty-year projected flows within the District, the OMC lift station would require an upgrade prior to adding MO wastewater from the District. The OMC lift station is currently responsible for ,M transporting approximately half of the Town's wastewater flow, and would additionally be required to transport all of the wastewater generated in the District. MR IM The OMC lift station currently pumps wastewater through an 8-inch force main to an existing 10-inch gravity line in the Town Limits. The existing force main is not expected to require an upgrade based on the anticipated wastewater flows in the District. However, the Town's 10—inch interceptor line, which collects all wastewater generated in the Town of Burnsville, will require replacement during Phase 1 of the collection system F, improvements. Preliminary hydraulic calculations conclude that the existing interceptor line is currently not sized to carry the Town's existing wastewater flows plus the projected Phase 1 flows within the District. Preliminary calculations are included in Appendix C of this report. M" The Town currently operates and maintains a municipal WWTP located on the west side of Town on the Cane River. The permitted capacity of the WWTP is 0.80 million gallons per day (MGD), and the current average daily wastewater flow treated by the facility is approximately 0.45 MGD. MW MR 17 Based upon this data, it appears that some excess capacity is available to treat the approximately 150,000 gallons per day of wastewater flow generated from this project. However, in order to preserve the current situation of excess capacity for the Town of Burnsville citizen ; "a capacity depletion charge *11 be required to help the Town regain the lost capacity that will be committed to the District. This will allow the Town to FOR expand the capacity of their WWTP when it does reach capacity without penalizing those citizens who had previously paid for the capacity utilized by the District. Furthermore, M" the District will be required to negotiate a bulk user contract with the Town and pay OM monthly usage charges for the flow actually generated. Figure III-1 illustrates the proposed location of the two (2) new submersible lift stations, the existing 4MC lift station, new and existing force mains and the gravity interceptor line replacement necessary for Alternative No.2. All aspects of the proposed alternative would be constructed in accordance with the current NCDWQ standards. This would include lift stations constructed with concrete wet wells, control panels, emergency generators, chain link fences, and the necessary sewer system appurtenances. M" M, With the construction of this alternative, the existing Town of Burnsville wastewater collection system will expand and begin to create and regionalize a sewer system within Yancey County. However, this alternative would increase the collection system complexity due to the reliance on multiple, series pump stations to transfer untreated wastewater over four miles to the Town of Burnsville. Based on the pumping system complexity, maintenance constraints, and significantly higher capital costs a" rM 18 compared to other alternatives, this alternative is not considered to be a viable option. Appendix A of this report includes two (2) letters from Mr. Tom Storie, Director of Public Works for the Town of Burnsville, that summarize the Town's requirements for a connection to their system. Mr. Storie confirms the upgrades required to the Town's system, Ce:r:equire:ment of a $3.00 per gallon impact fee, d the negotiation of a bulk user contract with the District. Costs associated with these items are included in either the capital or operation and maintenance cost estimates for this alternative. (T:hecapacity depletion charge ill be assessed as a one-time charge to allow the District to utilize capacity at the existing plant, and preserve the current situation of „M excess capacity for the Town's citizens. Since flow from the OMC lift station is currently treated at the Town's WWTP, this wastewater should not be included when R" determining the capacity depletion charge. Removing the OMC lift station flows from IM the . flow projections in Table II-3 results in a 20-year flow of approximately 123,000 �0 I r GPD within the District. The capacity depletion charge can therefore be calculated as MR 123,000 GPD X $3.00/ga = $369,000. FM no M MR The estimated capital costs associated with this alternative are included in Table 19 M IIIIIIII M TABLE II1-1 CAPITAL COST FOR ALTERNATIVE No. 2 CONNECTION TO TOWN OF BURNSVILLE 1 Mobilization (3%) 1 LS $ 124,500.00 $ 124,500 2 Wastewater Pump Station #1 - Micaville, Complete, Including Site Work, Electrical, Etc. I LS $ 150,000.00 $ 150,000 3 Wastewater Pump Station #2 - Burnsville Elementary, Complete, Including Site Work, Electrical, Etc. 1 LS $ 150,000.00 $ 150,000 4 Wastewater Pump Station #3 - OMC Pump Station Upgrade, Complete 1 LS $ 150,000.00 $ 150,000 5 6" Dia. Sewer Force Main W/ Washed Stone Embedment 27000 LF $ 30.00 $ 810,000 6 24" Gravity Interceptor Sewer Line W/ Washed Stone Embedment 11000 LF $ 60.00 $ 660,000 7 Steel Encasement Pipe, Bored and Jacked 4000 LF $ 150.00 $ 600,000 8 Creek Crossings 3000 LF $ 150.00 $ 450,000 9 Gravel Drive Repair 10000 TN $ 18.00 $ 180,000 10 Pavement Repair 15000 1 SY 1 $ 20.00 $ 300,000 11 Rock Excavation 10000 CY $ 60.00 $ 600,000 12 -Select 10000 CY S 0.00 S OQ000 TOTAL ESTIMATED CONSTRUCTION COSTS b Contingencies $ 4,274,500 $ 427,500 c Legal and Administrative $ 50,000 d Capacity Depletion Charge ($3.00 per Gallon) $ 369,000 e Easement Acquisition $ 25,000 f Engineering Design $ 265,000 8 Construction Administration and Observation Services S 213,700 h TOTAL ESTIMATED PROJECT COSTS .,. ..... .. .:.... ........ o......J.., ob.. rin, $ 5,624,700 in —tUr, and cmmnlcied Nutc: umi om pncurg a vaau" Vrr ,,.,,,.. ............................._. __. _ within the State of North Carolina. Operation and maintenance associated with this alternative will include those tasks associated with typical gravity sewer system, pump station, and force main maintenance, and are based on typical costs for these systems. Currently, it is planned that the District will contract with the Town of Burnsville for operation and maintenance of whatever facilities are constructed. In this case, the Town is already staffed and equipped for these tasks. 20 W ON The District will be required to enter a bulk user contract with the Town of Im Burnsville, and pay the Town a monthly fee for the treatment of the wastewater. The ,® Town's current sewer rates for customers outside the Town limits is $22.00 per 3,000 gallons. However, since the District will be considered a bulk user, a lower, more rAw reasonable rate would need to be agreed upon. For this analysis, a bulk user charge of r$2.00 per 1,000 GPD of wastewater generated has been used. MR The average daily flow generated in the District over the 20-year period (i.e., the average total flows in Table II-3 excluding the OMC lift station) is approximately 90,000 GPD. This equates to an annual bulk user charge of: M 90,000 GPD X 365 days/year X $2.00/1,000 GPD = $65,700 mm FM ow A summary of the estimated annual operations and maintenance costs is included in the Table III-2 and calculations are included in Appendix C. TABLE III-2 ANNUAL O&M COST ESTIMATE FOR ALTERNATIVE No. 2 CONNECTION TO THE TOWN OF BURNSVILLE Item Annual Cost Over 20-Year Planning Period Power Requirements $23,000 Pump Station Maintenance $2,500 Force Main / Gravity Sewer Maintenance $5,400 Sewer Use/Capacity Depletion Charges to Town of Burnsville ($3/1000 Gals.) $65,700 Total $96,600 ,� 21 The twenty-year present worth cost of Alternative No. 2, using a discount rate of Im 5.625% (per current NCDENR Construction Grants and Loans guidelines) is calculated on as follows: on PW = $5,6241,700 + $96,600 x (PIA, 5.625%, 20 yr.) ,J, PW = $53,624,700 + $96,600 x (11.87) am PRESENT WORTH = $6,771,342 r" Sm m MR om FM MR m" mm Sm 22 M, ALTERNATIVE NO. 3 — CONNECTION TO A PRIVATELY OWNED TREATMENT WORKS There are currently two (2) privately owned treatment works with NPDES discharge permits within a five -mile radius of the East Yancey Water and Sewer District. The treatment works are described as follows: MM Alternative No 3 A — Connection to Mountain View Motel Treatment Facility Alternative No 3-B — Connection to Taylor Togs, Inc. Wastewater Treatment Facility em IM The Mountain View Motel is located near the Burnsville Town limits on US Highway 19 E. The treatment facility has a current NPDES permit # NC0083282 to am discharge 2,500 GPD of treated effluent to the headwaters of Little Crabtree Creek. The sm facility operates a sand filter treatment and disposal system that is far .below the capacity required to treat wastewater flows in the District. OM a+ The Motel is situated in an unsuitable location to provide treatment to the District's wastewater flow, and the site does not appear to have adequate space for expansion. The facility is located upstream of the proposed collection system and in Ow close proximity to the Town of Burnsville limits. Provisions to pump the wastewater to this location would therefore be similar to Alternative No. 2. Due to the permitted am capacity, lack of space, and insufficient location of the treatment facility, connection to M the Mountain View Motel is not considered a feasible option and will not be discussed further. fm so 23 � R The second alternative for connecting to a privately owned treatment facility is the possible connection to the Taylor Togs, Inc. treatment facility. This treatment facility is currently permitted to discharge 10,000 GPD under NPDES permit # NCO023566 and is located in an area that may be suitable to collect a majority of the District's flow with a FM gravity sewer system. FM Taylor Togs, Inc. was contacted regarding the treatment of wastewater generated in the District at their facility, but correspondence indicates that the clothing manufacturer is not interested in receiving and treating the flow for various reasons. A letter from Mr. Sam Cook, Facilities Manager for Taylor Togs, Inc. is included in Appendix A of this report. Due to this correspondence, the option of treating the R, District's wastewater at the Taylor Togs, Inc. WWTP is not considered feasible and will Em ow rim M am not be discussed further. Figure III-2 illustrates the locations of the two (2) privately owned treatment works within a five -mile radius of the East Yancey Water and Sewer District. 24 �� A +�^,:.• �' , � ! „+A �'• T�'�� t _ - . � pi. 'Y �1 '�'i': .i �f Lr . +�'• - 7^.f-_r' , _ . " 7 �.. #.,r• ?' i w; '!�- (` » siJbi L C : 1,•.5•.• - 7. '; i = !i" .�/>I-a _ —.f �? =�i .,-y ` +���•` •�, _ •wrt, } � .tir ,�. , ;�}- L'.. .� - . L • - •ft- . f S / �• .J•�., .1 �� Al �\ ! ? 'si" Yr� ^'. 't .I -a. _.t.�' •l�tn� .�`''. ! ��/ :� is + IT . i •; IEEE . 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Py�;, r r' -, I. g. � �' 1 � •: _ =i.r, i � \� . �- �.w Or �s• �«+ _, .�•.•�i kxt ,es,� •wt. = � _ _ +� ` r•: � �. s � ` r'' O ��-:- ... _ � �'rr a�� i 1 J 411 V 1l yi .[ M--•i y ` t -•{ r}F �•^I - • _ - - 1�_-• F -� _ T �' � _ f - +- s ,- Y .e f� AFC - •�*^:Y� ..,.,,4: a.°• '-'�7 •_l,,-�-'y� y� .� -+��' x.:. # .'#` }• ;r.s '� , .f, � . :�i i _ w:, 1. :f . R ►.c. _.:� -T �•'`C"" T4.. p , �+�' ■y - � .:a -.'� ...7�y-. .- 'i r-.•A .,r,y � - �,-.,:i 1r - �. � :�.� �k.. _ .i 4 . • + ,.. ji- i ' "f ... E3S � i '►. �w: k�"r�� - WI(1-LQW. - ,rtr. � � w-. "` r i'• - - ,.� • ,,; ]�I� pr `T. 11 �.( IF Kv p �F �4'y.• _ .'#.o I' .. pub _ �:� t,-' .4 i-» � �-�.'._�:,.. � � ,� T'.."1` 'r, ... I - �. e: V 1 �a i•, k r,. `s i• S 15. . •e '' �'� �! '1 - - �+ 3 •gyp{', T �' v ; ,r-R - - _ -v t ..� .t:• .•��.. •i �.' fir ,� - . { ` - :.�,'. SCALE: 1"= 1600, c •. ti* a ,'�� w.,� J _ter+� IT .� .i.+ �f,•" rye - .. :.7r .. - --'_-,r�_• ''t•' l i' ',t - r': At Or FIGURE III -2 �� ', :,: _ _ � _ .. _ - _ ' _ -.. • Y•_ $ I h — .- - L•M -`� •r+ . '�..- Ixi.'.'Ly County ALTERNATIVE No.3-A & ALTERNATIVE No.3 B thr& SeVvgr District s It CONNECTION TO PRIVATELY OWNED' i'' _ '`' ;�-�`' "8ounda ' 1 •n` 1 ry m 1 H'C.KDRY TREATMENT FACILITY i� A-_, * _ -S. RINGS ('Jill EAST YANCEY'y" mc A S S O C I A T E S WATER &SEWER DISTRICT 1~ y• { _ ENGIN•PLANNING•FINANCE •. t ;i . 55 BROAD STRFET TRP�T ASHF.VIId_F NC PH. (828) 252-0575 ALTERNATIVE NO. 4 — INDIVIDUAL AND COMMUNITY SUBSURFACE SYSTEM Nearly all of the approximately 490 homes and 34 businesses in the District are currently served by privately owned individual subsurface wastewater disposal systems. During the septic system surveys that were previously performed, it was documented that some property owners are currently experiencing problems with their systems, and many property owners are utilizi * straight piping reduce the loading to their system. Accordin to the Toe River Health epartment, additional property owners have been denied improvement permits or repair permits due to restrictive soils or space limitations. FE" For these reasons, the East Yancey Water and Sewer District recently received am $3,000,000 in funding from the North Carolina Rural Economic Development Center through the Unsewered Communities Grants Program to develop a sewer collection and I" treatment system, and allow the individual problematic septic systems in the area to be Im abandoned. Continuing to utilize the individual systems would be similar to the "No Action" alternative previously discussed (Alternative No. 1), and will not be discussed further. According to soils data provided by the United States Department of Agriculture (USDA) Natural Resources Conservation Service (MRCS), approximately 70 percent of the soils in the District are either classified as "marginally suitable" or "unsuitable" for subsurface septic systems. However, the soils report that was completed by Toney C. Jacobs & Associates of Mooresville, North Carolina for this report states that the 11-acre am am 25 wastewater disposal site that is currently owned by the County contains soils that are deep, well -drained, and permeable. The potential may therefore exist for a community subsurface system to be constructed on this site. To fairly compare this alternative to the other alternatives, the proposed community subsurface system would be required to treat an average daily flow of 400,000 GPD. As with the surface water discharge alternative (Alternative No. 5), it is proposed to evaluate the subsurface system in two (2) phases. The first phase would be M sized to treat 150,000 GPD of flow, and the second phase would be sized to expand the first phase to a capacity of 400,000 GPD. I" an Due to the significant flows that are being considered in this study, a conventional subsurface system with a septic tank is not a feasible option. The wastewater would be required to obtain some level of treatment prior to discharge into the subsurface system. �+ Such treatment could be accomplished by a mechanical treatment facility or aerated lagoon. Due to the large space requirements typically required for the construction of a F, lagoon, and the lack of adequate space currently owned by the District, this alternative �+ assumes that a WWTP using secondary treatment technology and no disinfection would be included in the project. The subsurface system is assumed to require a pump station, force main, distribution manifolds, splitter tees, infiltrator chambers, and automated FM valves to control flow dosing to each of the zone manifolds. MM ,o 26 Wn M It is estimated that the construction of the WWTP will consume approximately five (5) acres of the current 11 acre tract of land owned by the County. Therefore, it is assumed that six (6) acres remain on the County's existing property that could possibly be used for subsurface disposal. According to NCDENR guidelines for conventional onsite disposal systems, long- term loading rates vary from 0.1 gallons per day per square foot (GPD/SF) to 1.0 GPD/SF depending on the type of soils encountered. Utilizing a long term loading rate of 0.5 GPD/SF, approximately 7 acres of effective area will be required for the 150,000 GPD of treated effluent in Phase 1, and approximately 18 acres will be required for the 400,000 GPD in Phase 2. Also per these guidelines, the length of distribution lines are typically sized by dividing the necessary area of land application by the trench' width. Using chamber technology and a trench width of four (4) feet, the total length of distribution line is approximately 75,000 linear feet in Phase 1 and 200,000 linear feet in Phase 2. Current regulations require the separation of nitrification lines at approximately nine (9) feet on IM centers and a repair area equal to 100% of the drainfield area. IM When applying the applicable soil loading rate, minimum trench separation, and OW repair area requirements, a total of 14 acres is necessary for Phase 1, requiring approximately 8 acres of additional property to be acquired. Phase 2 would require a am total area of approximately 36 acres and the purchase of an additional 22 acres. It is am IM 27 assumed in this estimate that suitable land could be obtained within the District for the purposes of the subsurface system. The actual amount of acreage to be acquired may vary depending on the soil, hydrological, and physical characteristics of the tract of land. Appendix D contains a summary of the estimated average land cost per acre within Yancey County ($3,250/acre) based on the MLS property listings in the area. The capital costs associated with Phase 1 of this alternative involve secondary treatment facility costs. Based on discussions with package plant manufacturers, the costs of tertiary treatment for a 150,000 GPD facility is approximately $90,000 and the cost of disinfection treatment is approximately $13,000. Table III-3 provides an estimate of the capital costs associated with Phase 1 of Alternative No. 4. The total cost of the package plant is estimated at $562,500, and FM includes all items included in the capital cost estimate for Phase 1 in Alternative No. 5 ($690,100) minus tertiary treatment and disinfection ($103,000), the outfall line to the river ($4,500), and mobilization ($20,100). Note that a 3% mobilization charge has been added to the entire project in Table III-3. MW MR MM no ,�, 28 M M TAB - ESTIMATED CAPITAL COST FOR ALTERNATIVE No. 4 - PHASE 1 WWTP AND COMMUNITY SUBSURFACE SYSTEM :. to Mobilization (3o/a) Qty Unit Unit Price $ 90,400 I 1 LS S 90,400.00 2 150,000 GPD WWTP, Secondary Treatment w/out Tertiary Filters 1 LS $ 562,500.00 $ 562,500 3 Dosing Pump Station 1 LS $ 125,000.00 $ 125,000 4 8" Effluent Piping to Manifolds 3000 LF $ 30.00 $ 90,000 5 Distribution Manifold 10 EA $ 5,000.00 $ 50,000 6 4" Sch. 40 PVC Pipe 66700 LF $ 10.00 $ 667,000 7 4" Flow Divider Tee 375 EA $ 40.00 $ 15,000 8 Infiltrator Chamber 75000 LF $ 20.00 $ 1,500,000 9 Electrical I LS S 10,000.00 $ 10,000 a TOTAL ESTIMATED CONSTRUCTION COSTS $ 3,109,900 b Contingencies S 311,000 C Legal and Administrative $ 15,000 d Soils Evaluation by Soil Scientist $ 50,000 e *Property Acquisition (8 Acres x $3,250/Acre ) $ 26,000 f Engineering Design $ 198,800 Construction Administration and Observation Services S 155300 h TOTAL ESTIMATED PROJECT COSTS '$ 3,866,000 " Based on current MU, listing wmmn t'anccy r ounry tAce r�ppcuwz v) NOTE: Unit bid pricing is based on recent certified bid tabulations or comparative costs for projects similar in nature and completed within the State of North Carolina Phase 2 of the project would involve the upgrade of the WWTP constructed in Phase 1, and the upgrade of the subsurface system to a capacity of 400,000 GPD. The costs associated with Phase 2 of this alternative involve treatment facility costs as shown in Alternative No. 5 ($824,000) excluding tertiary treatment and disinfection costs. Based on discussions with package treatment plant manufacturers, the cost of tertiary treatment facilities and disinfection facilities in Phase 2 is approximately $172,000. The $24,000 mobilization estimate that is included in the Alternative No. 5 estimate has also been removed, and a 3% mobilization fee has been added to the entire project in 29 M M 0 Alternative No. 4 (see below). Table III-4 provides an estimate of the capital cost associated with Phase 2 of Alternative No. 4. TABLE III-4 ESTIMATED CAPITAL COST FOR ALTERNATIVE No. 4 - PHASE 2 wWTP AND COMMUNITY SUBSURFACE SYSTEM 1 Mobilization (3a/o) Qty Unit Unit Price Extension 1 LS $ 137,800.00 $ 137,800 2 250,000 GPD WWTP, Secondary Treatment w/out Tertiary Filters I LS $ 628,000.00 $ 628,000 3 Upgrades to Dosing Pump Station I LS $ 100,000.00 $ 100,000 4 8" Effluent Piping to Manifolds 5000 LF $ 30.00 $ 150,000 5 Distribution Manifold 17 EA $ 5,000.00 $ 85,000 6 4" Sch. 40 PVC Pipe 119000 LF $ 10.00 $ 1,190,000 7 4" Flow Divider Tee 625 EA $ 40.00 $ 25,000 8 Infiltrator Chamber 125000 LF $ 19.00 $ 2,375,000 9 Electrical I LS $ 15,000.00 S 15,000 b TOTAL ESTIMATED CONSTRUCTION COSTS Contingencies , $ 4,705,800 '- $ 473,000 c Legal and Administrative $ 15,000 d Soils Evaluation by Soil Scientist $ 75,000 e *Property Acquisition (22 Acres x $3,250/Acre ) $ 71,500 f Engineering Design $ 293,300 Construction Administration and Observation Services $ 236,500 „ h s , , ,.„ ., TOTAL ESTIMATED PRQAECT COSTS $ 5,868,100 . * Basco on current wn-3 16ung wunm r uwcy ww"y IJce AFFcuu,.. v/ NOTE: Unit bid pricing is based on recent certified bid tabulations or comparative costs for projects similar in nature and completed within the State of North Carolina. The annual O&M costs for Phase 1 and Phase 2 of this alternative would consist of the O&M costs as described in Alternative No. 5 for the WWTP (minus the tertiary treatment and disinfection facilities), plus additional O&M costs for the subsurface system. Table III-5 includes an estimate of the annual O&M costs for Alternative No. 4. 30 awn MR TABLE III-5 ANNUAL O&M COST ESTIMATE FOR ALTERNATIVE No. 4 WWTP AND COMMUNITY SUBSURFACE SYSTEM Item Phase 1(0.15 MGD) Annual Cost Phase 2 (0.40 MGD) Annual Cost WWTP O&M $60,000 $150,000 Subsurface System $15,000 $30,000 Total $759000 $1809000 0" . Based on Phase 2 of the project being constructed two (2) years after Phase 1, the MR twenty-year present worth cost of Alternative No. 4, using a discount rate of 5.625% (per current NCDENR Construction Grants and Loans guidelines) is calculated below: PW = $3,866,000 + $75,000 x (P/A, 5.625%, 2 yr.) + $5,868,100 x (P/F, 5.625%, 2 yr.) + $180,000 x (P/A, 5.625%, 18 yr.) x (P/F, 5.625%, 2 yr.) PW = $398665000 + ($75,000 x 1.84) + ($5,868,100 x 0.9) + ($180,000 x 11.17 x 0.9) no PRESENT WORTH = $11,094,830 am om ,M, 31 ALTERNATIVE NO. 5 - SURFACE WATER DISCHARGE THROUGH THE NPDES PERMIT SYSTEM This alternative consists of the construction of a wastewater treatment plant (WWTP) on the eleven (11) acres of land currently owned by the County along the banks of the South Toe River. Since the initial collection system will only serve a portion of the District, the treatment facility is proposed to be constructed in two (2) phases. Phase 1 is proposed to involve the construction of a facility with a design capacity of 150,000 GPD and Phase 2 would upgrade the facility to a capacity of 400,000 GPD. Tertiary treatment and discharge to the South Toe River is the proposed alternative to be accomplished with a dual train package treatment facility. The District has secured funding to construct the improvements necessary for Phase 1, including the installation of collection system lines shown in Figure II-1, and the construction of a 150,000 GPD disposal facility. Partial funding for the Phase 2 improvements has already been secured, and the District is currently seeking the remainder of the funding necessary to construct the Phase 2 project. According to information obtained from the United States Geological Survey (USGS), the disposal site is located within a drainage area of approximately 61 square miles. In addition, the USGS states that average stream flows in Eastern Yancey County range from as high as 3.5 cubic feet per second per square mile (CFS/SM) to 0.35 (CFS/SM), and the South Toe River near the proposed treatment facility site has a recorded 7Q 10 flow of 26 CFS = 16.8 MGD and a 30Q2 flow of 52 CFS = 33.6 MGD. 32 FM The treatment facility proposed for this alternative includes a dual train package No treatment plant employing conventional suspended -growth, activated sludge processes. The dual train system will give the District the flexibility to treat initial flows generated no in the District with only one (1) train in operation. If necessary, both trains could be no utilized at one time to accommodate higher flows. IM M" The treatment facility would involve the construction of an influent pump station, mechanical bar screen with manual bypass, an aerated flow equalization basin, aeration tanks, primary settling tanks, an activated sludge return system, a sludge holding tank, and tertiary treatment of the effluent by the use o sand filter technolo Figure III-3 illustrates the process flow diagram for Phase 1 of the WWTP. The proposed facility would also include a new laboratory/electrical building that would be constructed in Phase 1 and utilized throughout the twenty-year planning period. Tertiary treatment of the effluent is proposed to provide a better quality effluent for discharge to the surface waters, and should also filter the effluent to a suitable level M" should reuse be considered. In addition, tertiary treatment will allow for greater OM M" SM MR disinfection efficacy due to the increased removal of organic matter. Chlorination and dechlorination are proposed as the final treatment prior to discharge. The Town of Burnsville has agreed to accept and treat biosolids generated at the District's WWTP. Residuals at the plant are therefore proposed to be pumped to a sludge 33 I I I 1 i 1 I I 1 1 I I I I 1 1 I i I SAND DISCHARGE TO FILTER SOUTH TOE RIVER 75,000 SAND FILTER 0 o 0 oa u O 75,000 BAR SCREEN PRE-EO BASIN o 0 WITH MANUAL 37,500 GPD AERATION N o a BYPASS CAPACITY (25%) BASIN m 75,000 75,000 150,000 GPD $ o z CLARIFIER o a < R. DES02) vO o �- CLARIFIER ^ CHLORINE 75,000 CONTACT 75,000 la SLUDGE AERATION HOLDING BASIN TANK INFLUENT PUMP 75,000 r� STATION SLUDGE HOLDING TANK FIGURE III-3 ALTERNATIVE No. 5 - PHASE 1 WWTF PROCESS FLOW DIAGRAM EAST YANCEY WATER & SEWER DISTRICT TRANSPORT TO BURNSVILLE FOR SLUDGE TREATMENT OMcGM A S S O C I A T E S ENGINEERING PLANNING FINANCE 55 BROAD STItEFIASHEVILLE. NP PH, (82a)25±4M5 r 11111111 F� Wil holding tank, and hauled to the Town of Burnsville WWTP for residual treatment. The Town of Burnsville currently dewaters sludge through a belt filter press and formulates a Class "A" product by the use of an aerated static pile composting bed. A preliminary site plan for Phase 1 of the East Yancey Water and Sewer District WWTP is included in Figure III-4. Table III-6 provides an estimate of the capital costs associated with Phase 1 of Alternative No. 5. TABLE III-6 CAPITAL COST FOR ALTERNATIVE No. 5 - PHASE 1 CONSTRUCTION OF INDEPENDENT WWTP WITH DISCHARGE TO THE SOUTH TOE RIVER No. Description Qty Unit Unit Price Extension 1 Mobilization(3%) 1 LS $ 20,100.00 $ 20,100 2 Dual Train 150,000 GPD WWTP, Complete, Including Yard Piping, Electrical, Etc. 1 LS $ 400,000.00 $ 400,000 3 office/Electrical Building 1 LS $ 100,000.00 $ 100,000 4 Site Clearing, Grading, Construction of Road I LS $ 15,000.00 $ 15,000 5 Effluent Outfall to River 150 LF $ 30.00 $ 4,500 6 Influent Wastewater Pump Station, Complete, Including Site Work, Electrical, Etc. 1 LS $ 125,000.00 $ 125,000 7 Water Supply to WWTP 1 LS $ 10,500.00 $ 10,500 8 Emergency Generator 1 EA S 15,000 00 $ 15,000 .TOTAL ESTIMATED CONSTRUCTION COSTS 699,100 _-a b Contingencies $ 69,000 c Preliminary Planning and Site Assessments $ 7,000 d Legal and Administrative $ 15,000 e Engineering Design $ 53,900 S Construction Administration and Observation Services TOTAL ESTIMATED PROJECT COSTS __ :... 1,.,,,.., $ 34,500 ,,,,lrnn,,,i ,Pd NU J h: unit ma pricing is oases un rcucm a:riumu mu .............. within the State of North Carolina. 34 FIGURE III-4 I I ALTERNATIVE No. 5 - PHASE 1 PROPOSED WWTP EAST YANCEY WATER & SEWER DISTRICT I I I I / I I / 'I I i I I I I FLOW SLUDGE AERATION LARIFIERS EQUALIZATION HOLDING BASIN BASIN TANK SAND FIL}}ATE CELLS INFLUENT 1 ------ --- - " DI HAY2Gt FORCE MAIN I I I I SLUDGE 'I I LOADING CHI DRINE/S02 STATION INFL EN I PUM I ASPHALT 1 STATION I I p I I I oil, OFFICE/LAB/�L I I 110o ELECTRICAL p I I ❑1 I 0 0 1q: I I I MECHANICAL W I I BAR SCREEN I I> to EMERGENCY I1 WITHI GENERATOR / I BSA SANUAL_ 'O I LLI I 0 / I=1 I I to Pc�QO GRAVITY SEWER (BY OTHERS) p p 0 McGifl \\ SCALE: 1"=60' d / // ENGINEERINGPLANNING FINANCE 55 BHOAll STREET ASIILVLLLL. NC PH, IN2tl1253-U5]5 r_2 Flows to the WWTP are expected to increase as additional phases of the MO wastewater collection system are constructed throughout the District. During Phase 2 of ,M the twenty-year planning period, the WWTP is proposed to be expanded from a capacity of 150,000 GPD to 400,000 GPD to accommodate the additional flow. It is anticipated am that the 150,000 GPD package plant, constructed in the initial phase, would remain in No service upon completion of the Phase 2 expansion. W9 Phase 2 of this alternative includes the installation of a second package treatment unit to be located adjacent to the plant constructed in Phase 1. The capacity of the second unit is proposed to be 250,000 GPD and will be constructed with the same treatment components as the plant constructed in Phase 1, including tertiary filtration units. MM The facility expansion would also involve upgrades to the influent pump station constructed in Phase 1. It is assumed that the pump station wet well would be adequately sized during Phase 1 to accommodate Phase 2 expansion; therefore a new influent pump station wet well would not be required. Due to the substantial increase in flow, it is anticipated that the expansion would include a new influent force main, and the replacement of the influent pumps. A grit removal system is also proposed to be added to the head of the facility. A flow control valve vault and piping would be installed to distribute flow between the two (2) treatment units. Preliminary calculations are included in Appendix C of this report. RM It is assumed that the office/laboratory building that is proposed to be constructed No no 35 in Phase 1 will be adequately sized for Phase 2 of the project, so that no upgrades will be required to the facilities during the Phase 2 facility expansion. Therefore, no additional costs have been added to the project for the upgrade of this building in Phase 2. A preliminary site plan for the Phase 2 East Yancey Water and Sewer District WWTP is included in Figure III-5. Table III-7 provides an estimate of the capital costs associated with Phase 2 of Alternative No. 5. TABLE III-7 CAPITAL COST FOR ALTERNATIVE No. 5 - PHASE 2 CONSTRUCTION OF INDEPENDENT WWTP WITH DISCHARGE TO THE SOUTH TOE RIVER Item Description Ift No. IN 1 Mobilization (30/6) 1 LS $ 24,000.00 $ 24,000 Dual Train 250,000 GPD W WTP, I LS $ 650,000.00 $ 650,000 2 Complete, Including Additional Yard Piping, Flow Control Appurtenances, Electrical, Etc. Flow Control Valve Vault with Piping 1 LS $ 10,000.00 $ 10,000 3 and Appurtenances 4 Additional Site Clearing and Grading I $ 10,000.00 $ 10,000 Upgrades to Influent Wastewater Pump 1 $ 100,000.00 $ 100,000 5 Station, Complete, Including Site Work, JEA Electrical, Etc. 6 Emergency Generator 1 $ 30,000.00 $ 30,000 a TOTAL ESTIMATED CONSTRUCTION COSTS $ 824,000 b Contingencies $ 82,400 c Preliminary Planning and Site Assessments $ 5,000 d Legal and Administrative $ 15,000 e Engineering Design $ 61,000 f Construction Administration and Observation Services S 41,200 S TOTAL ESTIMATED PROJECT COSTS $ 1,028,600 NU I h: Unit bid pricing is based on reccnt ccnmco ow mnum ions or congru;nivc wm> im ............. ...... ...,...�,....�.. within the State of North Carolina. The annual O&M costs for both the initial phase and expansion phase of Alternative No. 5 would consist of the costs typically required to operate a WWTP. The ,� 36 r f� FIGURE III-5 ALTERNATIVE No. 5 - PHASE 2 I I I PROPOSED WWTF EXPANSION EAST YANCEY WATER & SEWER DISTRICT Ij CLARIFIERS "I SLUDGE HOLDING TANK I SAND�FI ER 1 FLOW CELLS EQUALIZATION ' BASIN _ ;_'�. i_I.�.._ ( SLUDGE LOADING STATION I I AERATION II FLOW BASIN EQUALIZATION BASIN SLUDGE CLARIFIERS HOLDING SANt F TER l l I FLOW CONTROL TANK VALVE VAULT EF LU T INFLUENT _ - r--�-�`- �-" DI H�Gt FORCE MAIN f I ) I SLUDGE LOADING CHL RINE / SO2 STATION I ]NFL EN 11 PUM ASPHALT STATION a I� I I I OFFICEILAB I I I o ELECTRICAL I O I II ml - a ; II z I I x MECHANICAL Illy to EMERGENCY I I BAR SCREEN WITH A UAL/ I� GENERATORS I I BZPASSIw 1 I I I= _II I a / IN a yQ� GRAVITY SEWER Q' (BY OTHERS) 1 / I McGill SCALE: 1"= 60' / � A S S O C I A T E S \ / / ENGINEER] N G - PLANNIN G -FINANCE / 55 BROAD STREET ASAEVR,L . NC M (828) 252-O575 operation of this facility will require operations and maintenance items including staff OR salaries and/or consultant fees (operator, lab testing, sludge hauling, etc.), office expenditures (supplies, postage, heat, electricity, telephone, etc.), bonding and insurance, treatment chemicals, supplies, electricity, pump and other equipment maintenance, grounds and facility maintenance, etc. Currently, it is planned that the District will sm contract with the Town of Burnsville for operation and maintenance of whatever facilities so P" "I MR MR are constructed. In this case, the Town would be required to hire an operator for the facility. A summary of the estimated annual operations and maintenance costs is indicated in Table III-8. TABLE III-8 ESTIMATED ANNUAL O&M COST FOR ALTERNATIVE No. 5 CONSTRUCTION OF INDEPENDENT WWTP WITH DISCHARGE TO THE SOUTH TOE RIVER Item Phase 1 (0.15 MGD) Annual Cost Phase 2 (0.40 MGD) Annual Cost Salaries and Benefits $30,000.00 $60,000.00 Office Expenditures $1,000.00 $3,000.00 Bonds and Insurance $1,000.00 $3,000.00 Chemicals $2,000.00 $6,000.00 Supplies $3,000.00 $8,000.00 Utilities $12,000.00 $30,000.00 Maintenance and Repairs $4,000.00 $10,000.00 Testing $5,000.00 $13,000.00 Sludge Hauling to the Town of Burnsville $10,000.00 $30,000.00 Miscellaneous $2,000.00 $4,000.00 Total $70,000.00 $167,000.00 Based on Phase 2 of the project being constructed two (2) year after Phase 1, the twenty-year present worth cost of Alternative No. 5, using a discount rate of 5.625% (per current NCDENR Construction Grants and Loans guidelines) is as follows: MR 37 an PW = $8699500 + $70,000 x (P/A, 5.625%, 2 yr.) + $1,028,600 x (P/F, 5.625%, 2 yr.) + $167,000 x (P/A, 5.625%, 18 yr.) x (P/F, 5.625%, 2 yr.) PW = $8695,500 + ($70,000 x 1.84) + ($1,028,600 x 0.90) + ($167,000 x 11.17 x 0.90) on PRESENT WORTH = $3,16029891 m" ow am oft m �� f" so M" 38 am Wft ALTERNATIVE NO.6— DRIP IRRIGATION Alternative No. 6 involves the construction of a proposed wastewater treatment facility (WWTP) with tertiary treatment as described in Alternative No. 5, but instead of discharging the effluent flow into the South Toe River, the treated effluent would be land applied through a drip irrigation system. Tertiary treatment is advisable using drip irrigation technology due to the potential malfunctioning of drip irrigation emitters. Per State guidelines, a detailed soil analysis report was performed for the wastewater disposal site. A copy of the soils report that was completed by Toney C. Jacobs & Associates of Mooresville, North Carolina is included in Appendix B at the back of this report. Based on information included in the soils analysis report, an on -site drip irrigation system is not recommended for the disposal of flows anticipated by the District. Soil conditions are reportedly suitable at the disposal site, but due to the large area requirements necessary for a treatment system of the intended capacity, drip irrigation is not considered a viable option. According to the report, the recommended loading rate for the treated effluent in this area is 0.6 in/hour for a ground covered site or up to 1.0 inch of treated wastewater per week. Using the maximum recommended amount of 1.0 �+ inch per week equates to a total volume of 0.09 gallons per day per square foot (GPD/SF). Utilizing this loading rate, approximately 38 acres of effective area will be required for the 150,000 GPD of treated effluent in Phase 1, and approximately 102 acres am no 39 OM will be required for the 400,000 GPD in Phase 2. am No The County currently owns approximately eleven (11) acres of land north of US Highway 19 E off of Wyatt Town Road on the banks of the South Toe River. It is estimated that the construction of the WWTP will consume approximately five (5) acres of this tract of land. Therefore, for the purposes of this study, it will be assumed that six (6) acres remain that could possibly be used for drip irrigation. an P" According to State regulations, drip irrigation systems require 50-foot setbacks from property lines. When applying the 50-foot setback requirement and the applicable IM soil loading rate, a total of 44 acres is necessary, requiring approximately 38 acres of 00 additional property to be acquired during Phase 1. Phase 2 would require a total area of approximately 112 acres and the purchase of an additional 68 acres. The actual amount am of acreage to be acquired may vary depending on the soil, hydrological, and physical Ift characteristics of the tract of land. Appendix D contains a summary of the estimated average land cost per acre within Yancey County ($3,250 per acre), based on current MLS listings in the area. W In addition to the land requirements outlined above, the State regulations require a am storage pond capable of holding the effluent during wet or freezing weather for a pd' minimum of 5-days when using a drip irrigation system. Therefore, a 750,000 gallon aerated storage pond will be required for Phase 1, and a 2 million gallon holding pond 00 will be required for the future flows in Phase 2. MW 40 r The capital costs associated with Phase 1 of this alternative involve treatment facility costs detailed in Alternative No. 5, excluding disinfection costs and the costs r associated with an effluent outfall line. Based on discussions with package treatment plant manufacturers, the cost of disinfection treatment equipment is approximately r $13,000 for this size of a facility. r Table III-9 provides an estimate of the capital costs associated with Phase 1 of r Alternative No. 6. The total cost of the package plant is estimated at $652,500, and r r ON MI it includes all items included in the capital cost estimate for Phase 1 in Alternative No. 5 ($690,100) minus disinfection ($13,000), the outfall line to the river ($4,500), and mobilization ($20,100). Note that a 3% mobilization charge has been included in the entire project estimate in Table III-9. TABLE III-9 CAPITAL COST FOR ALTERNATIVE No. 6 — PHASE 1 WWTP AND DRIP IRRIGATION SYSTEM Item No. Description=,,. 1 LS $ 62,300.00 $ 62,300 I Mobilization (3%) 2 150,000 GPD W W'IP (Total Construction Costs) 1 LS $ 652,500.00 $ 652,500 3 5 Day Storage Lagoon 1 LS $ 200,000.00 $ 200,000 4 Drip Irrigation Pump Station 2 EA $ 100,000.00 $ 200,000 5 Drip Irrigation Piping 10000 LF $ 30.00 $ 300,000 6 Drip Irrigation Systems 1 LS $ 750,000.00 $ 750,000 a ,, TOTAL ESTIMATED CONSTRUCTION COSTS $ 2,164,800 b Contingencies $ 217,000 c Legal and Administrative $ 15,000 d Property Acquisition ( 38 Acres) $ 123,500 e Engineering Design $ 160,000 f Construction Administration and Observation Services $ 100,000 K TOTAL ESTIMATED PROJECT COSTS $ 2,780,300 + r . tiasea on current Mr.O usung wumn Yancey i,oumy tacc nppcuuu vt NOTE: Unit bid pricing is bated on recent certified bid tabulations or comparative costs for projects similar in nature and completed within the State of North Carolina r 41 Phase 2 of the project would involve the upgrade of the WWTP constructed in Phase 1, and the upgrade of the drip irrigation system to a capacity of 400,000 GPD. The costs associated with Phase 2 of this alternative involve treatment facility costs as described in Alternative No. 5 ($824,000) excluding mobilization ($24,000) and disinfection costs. Based on discussions with package treatment plant manufacturers, the cost of disinfection facilities in this size of a facility is approximately $22,000. Table III-10 provides an estimate of the capital cost associated with Phase 2 of Alternative No. 6. TABLE III-10 ESTIMATED CAPITAL COST FOR ALTERNATIVE No. 6 - PHASE 2 .r WWTP AND DRIP IRRIGATION SYSTEM 0 am I Mobilization (3a/a) 1 LS $ 83,300.00 $ 83,300 2 250,000 GPD WWTP (Total Construction Costs) 1 LS $ 778,000.00 $ 778,000 3 5 Day Storage Lagoon 1 LS $ 350,000.00 $ 350,000 4 Drip Irrigation Pump Station 2 EA $ 100,000.00 $ 200,000 5 Drip Irrigation Piping 15000 1 LF $ 30.00 $ 450,000 6 Drip Irrigation Systems 100000 1 LF S 10.00 S 1,00U00 a TOTAL ESTIMATED CONSTRUCTION COSTS S 2,861,300 b Contingencies S 286,100 c Legal and Administrative $ 55,000 d Property Acquisition (106 Acres) $ 344,500 e Engineering Design $ 200,000 j Construction Administration and Observation Services $ 120,000 g TOTAL ESTIMATED PROJECT COSTS $ 3,826,900 tiasea on current rvu.a usung wamu 141y NOTE: Unit bid pricing is based on recent certified bid tabulations or comparative costs for projects similar in nature and completed within the State of North Carolina. The annual O&M costs for Phase 1 and Phase 2 of this alternative would consist of the O&M costs as described in Alternative No. 5 for the WWTP (excluding 42 disinfection), plus additional O&M costs for the drip irrigation system. Table III-11 am includes an estimate of the annual O&M costs for Alternative No. 6. TABLE III-11 No ANNUAL O&M COST ESTIMATE FOR ALTERNATIVE No. 6 WWTP AND DRIP IRRIGATION SYSTEM no a" do M MR 0" am Item Phase 1(0.15 MGD) Annual Cost Phase 2 (0.40 MGD) Annual Cost WWTP O&M . $67,000 $160,000 Drip Irrigation System $15,000 $30,000 Total $829000 $1909000 Based on Phase 2 of the project being constructed two (2) years after Phase 1, the twenty-year present worth cost of Alternative No. 6, using a discount rate of 5.625% (per current NCDENR Construction Grants and Loans guidelines) is calculated below: PW = $227803,300 + $82,000 x (P/A, 5.625%, 2 yr.) + $3,826,900 x (P/F, 5.625%, 2 yr.) + $190,000 x (P/A, 5.625%, 18 yr.) x (P/F, 5.625%, 2 yr.) PW = $22,7802300 + ($82,000 x 1.84) + ($3,826,900 x 0.9) + ($190,000 x 11.17 x 0.9) PRESENT WORTH = $8,285,460 ON 43 Im Or ALTERNATIVE NO.7 — SPRAY IRRIGATION 0, am Alternative No. 7 involves the construction of the proposed wastewater treatment facility (WWTP) described in Alternative No. 5 without the inclusion of tertiary filtration units. Instead of discharging the effluent flow into the South Toe River, the treated o., effluent will be land applied through a spray irrigation system. on Per State guidelines, a detailed soil analysis report was performed for the proposed wastewater disposal site. A copy of the soils report that was completed by Toney C. Jacobs & Associates of Mooresville, North Carolina is included in Appendix B at the back of this report. Based on information included in the soils analysis report, an on -site spray irrigation system is not recommended for the disposal of flows anticipated by the District. w Soil conditions are reportedly suitable at the disposal site, but due to the large area requirements necessary for a treatment system of the intended capacity, spray irrigation is not considered a viable option. According to the report, the recommended loading rate for the treated effluent in this area is 0.6 in/hour for a ground covered site or up to 1.0 inch of treated wastewater per week. Using the maximum recommended amount of 1.0 inch per week equates to a total volume of 0.09 gallons per day per square foot (GPD/SF). Utilizing this loading rate, approximately 38 acres of effective area will be required for the 150,000 GPD of treated effluent in Phase 1, and approximately 102 acres „m 44 PER .R will be required for the 400,000 GPD in Phase 2. The County currently owns approximately eleven (11) acres of land north of US Highway 19 E off of Wyatt Town Road on the banks of the South Toe River. It is estimated that the construction of the WWTP will consume approximately five (5) acres of this tract of land. Therefore, for the purposes of this study, it will be assumed that six (6) acres remain that could possibly be used for spray irrigation. M" According to State regulations, spray irrigation systems require 150-foot setbacks from property lines. When applying the 150-foot setback requirement and the applicable soil loading rate, a total of 58 acres is necessary, requiring approximately 52 acres of additional property to be acquired during Phase. Phase 2 would require a total area of approximately 133 acres and the purchase of an additional 75 acres. The actual amount of acreage to be acquired may vary depending on the soil, hydrological, and physical P" characteristics of the tract of land. Appendix D contains a summary of the estimated average land cost per acre within Yancey County ($3,250/acre), based on the MLS ,.4 property listings in the area. no In addition to the land requirements outlined above, the State regulations require a storage pond capable of holding the effluent during wet or freezing weather for a minimum of 5-days when using a spray irrigation system. Therefore, a 750,000 gallon aerated storage pond will be required for Phase 1, and a 2 million gallon holding pond will be required for the future flows in Phase 2. no IM 45 The capital costs associated with Phase I of this alternative involve treatment M, facility costs described in Alternative No. 5 excluding tertiary treatment costs, disinfection costs and the costs associated with an effluent outfall line. Based on discussions with manufacturers of package treatment plants, the costs of tertiary treatment and disinfection during Phase 1 of this alternative is approximately $103,000. Table III-12 provides an estimate of the capital costs associated with Phase 1 of ., Alternative No. 7. The total cost of the package plant is estimated at $562,500, and =, includes all items included in the capital cost estimate for Phase 1 in Alternative No. 5 ($690,100) minus tertiary treatment and disinfection ($103,000), the outfall line to the river ($4,500), and mobilization ($20,100). Note that a 3% mobilization charge has been added to the entire project in Table III-12. TABLE III-12 ESTIMATED CAPITAL COST FOR ALTERNATIVE No. 7 - PHASE I .. WWTP AND SPRAY IRRIGATION SYSTEM M, 0 r� M MI Item'. No. Description Qly Unit Unit [rice Extension 1 Mobilization (3%) 1 LS $ 62,000.00 S 62,000 2 150,000 GPD WWTP, Secondary Treatment w/out Tertiary Filters 1 LS $ 562,500.00 $ 562,500 3 5 Day Storage Lagoon 1 LS $ 200,000.00 $ 200,0W 4 Spray Irrigation Pump Station 2 'EA $ 100,000.00 $ 200,000 5 Spray Irrigation Force Main to Site 10000 LF $ 30.00 $ 300,000 6 Spray Irrigation Distribution Pipe 50000 LF $ 15.00 $ 750,000 7 Spray Irrigation Spray Guns 30 EA $ 1,000.00 S 30,000 a TOTAL ESTIMATED CONSTRUCTION COSTS S ,2,104,500 6 Contingencies S 210,000 c Legal and Administrative $ 15,000 d *Property Acquisition (52 Acres x $3,250/Acre) $ 169,000 e Engineering Design $ 150,000 f Constntction Administration and Observation Services $ 101,000 g TOTAL ESTIMATED PROJECT COSTS $ 2,749,500 ' tsaseo on current mts usung wunm r ancey wuary tacc nppcuwn v) NOTE: Unit bid pricing is based on recent certified bid tabulations or comparative costs for projects similar in nature and completed within the State of North Carolina. 46 r Phase 2 of the project would involve the upgrade of the WWTP, and the upgrade of the spray irrigation system to a capacity of 400,000 GPD. The costs associated with .. Phase 2 of this alternative involve treatment facility costs as shown in Alternative No. 5 ($824,000) excluding tertiary treatment and disinfection costs. Based on discussions with .. package treatment plant manufacturers, the cost of tertiary treatment facilities and r disinfection facilities in Phase 2 is approximately $172,000. The $24,000 mobilization estimate that is included in the Alternative No. 5 estimate has also been removed, and a 3% mobilization fee has been added to the entire project in Alternative No. 7 (see below). Table III-13 provides an estimate of the capital cost associated with Phase 2 of M Alternative No. 7. r r r TABLE III-13 ESTIMATED CAPITAL COST FOR ALTERNATIVE No. 7 - PHASE 2 WWTP AND SPRAY IRRIGATION SYSTEM Item bescrtption Qty Unit '• Unit Price Extension. 1 Mobilization (3%) I LS S 81,800.00 S 81,800 2 250,000 GPD WWTP, Secondary Treatment Wout Tertiary Filters 1 LS $ 628,000.00 $ 628,000 3 5 Day Storage Lagoon 1 LS $ 350,000.00 $ 350,000 4 Spray Irrigation Pump Station 2 EA $ 100,000.00 $ 200,000 5 Spray Irrigation Force Main to Site I5000 LF $ 30.00 $ 450,000 6 Spray Irrigation Distribution Pipe 70000 LF $ 15.00 $ 1,050,000 7 Spray Irrigation Spray Guns 50 EA $ 1,000.00 $ 50,000 a TOTAL ESTIMATED CONSTRUCTION COSTS S 2,809,800 y Contingencies $ 281,000 a Legal and Administrative $ 15,000 d *Property Acquisition (127 Acres x $3,250/Acre) $ 412,750 f Engineering Design $ 198,000 S Construction Administration and Observation Services S 150,000 h TOTAL ESTIMATED PROJECT COSTS S 3,866,550 tsasca on current rvu.n usuag .VILLLLII ,.ally ILy , « „,"111...,A NOTE: Unit bid pricing is based on recent certilied bid tabulations or comparative costs for projects similar in nature and completed within the State of North Carolina. .. 47 M ow ,no am am The annual O&M costs for Phase 1 and Phase 2 of this alternative would be similar to the O&M costs described in Alternative No. 5 for the WWTP (minus the tertiary treatment and disinfection facilities), plus additional O&M costs for the spray irrigation system. Table III-14 includes an estimate of the annual O&M costs for Alternative No. 7. TABLE III-14 ANNUAL O&M COST ESTIMATE FOR ALTERNATIVE No. 7 WWTP AND SPRAY IRRIGATION SYSTEM Item Phase 1 (0.15 MGD) Annual Cost Phase 2 (0.40 MGD) Annual Cost WWTP O&M (Alt. No.5) $60,000 $150,000 Spray Irrigation System $102000 $20,000 Total $709000 $1709000 Based on Phase 2 of the project being constructed two (2) years after Phase 1, the twenty-year present worth cost of Alternative No. 7, using a discount rate of 5.625% (per current NCDENR Construction Grants and Loans guidelines) is calculated below: PW = $2,749,500 + $70,000 x (P/A, 5.625%, 2 yr.) + $3,866,550 x (P/F, 5.625%, 2 yr.) + $170,000 x (P/A, 5.625%, 18 yr.) x (P/F, 5.625%, 2 yr.) PW = $2,74%500 + ($70,000 x 1.84) + ($3,866,550 x 0.9) + ($170,000 x 11.17 x 0.9) PRESENT WORTH = $8,067,205 am 48 0 �r ALTERNATIVE NO.8 — REUSE This alternative involves reusing all or a portion of the wastewater generated at the WWTP to minimize or eliminate the need for a surface water discharge. Potential reuse options include drip or spray irrigation, industrial process or cooling water, the use of reclaimed water for toilet flushing, etc. Drip irrigation and spray irrigation systems were previously analyzed in this P„ report as Alternatives No. 6 and No. 7. These options do not appear to be economically feasible when compared to other disposal methods, based on a twenty-year present value analysis. M Using reclaimed water for other types of land applications or for industrial or so residential use at local facilities would involve the construction of the WWTP as outlined *y Ow in Alternative No. 5. The option of plumbing all local facilities to use treatment facility effluent is not an economically feasible alternative, nor is there sufficient demand in the area to utilize the required effluent flow. At this time, there are no known industries that are planning to locate a facility to the area that could reuse the WWTP effluent as either a process or cooling water. Therefore, the option of reusing treated wastewater from the East Yancey Water and Sewer District WWTP is not considered feasible and will not be discussed further. 49 M o. 0 MR wo MR MR "M MR PW Im am fm MR 0" David GcindBtaff 'Town Of Burnsville CouncJors• Mayor Ruth L. Banks OUR N Charle8 Gillespie Jeanne Martin Heather Hockaday Tows Clerk Doyce G. McClure "T f4ry.w e�� October 29, 2003 Mr. Jeremy Cadeau, EI McGill Associates, PA 55 Broad Street Asheville, North Carolina 28801 McGILLASSOC. • FILE COPY RECEIVED NOV 0 3 2003 Project # File RE: Wastewater Treatment Availability East Yancey Water & Sewer District Mr. Cadeau, The Town of Burnsville would like to address the possibility of providing treatment services for the East Yancey County Water and Sewer District. Based on your correspondence it is my understanding that you are researching treatment alternatives for the flows generated by the District and that one of the alternatives is to connect to the Town of Burnsville system. The Town has already agreed to support the District both financially and managerially and has agreed to .accept sludge generated with the proposed construction of a new wastewater treatment plant (WWTP). However, the Town is concerned about the alternative to pump, collect, and treat the District's flows at the Burnsville WWTP due to the current condition and capacity of the Town's sewer collection and treatment system. It is my understanding that the acceptance of District flows into the Town of Burnsville system would require District flows to be pumped to the eastern edge of Burnsville Town limits to the existing OMC pump station. This pump station currently handles roughly half of the Town's flow and feeds directly into the Town's main interceptor line which then enters the treatment plant. The pump station and the interceptor line to the treatment plant do not have the capacity to handle the expected flows. During recent infiltration and inflow studies of the sewer system, the Town's main interceptor was identified as having significant infiltration and inflow. Based on field inspections, the main 10-inch interceptor is already flowing half full and is not expected to handle the increased District flows especially during days when rainfall occurs. If this alternative were considered further, funding would be needed immediately to aid the Town of Burnsville in the replacement of approximately 11,000 feet of the 10- inch interceptor line and the construction of a larger OMC Pump Station, The Town does no P.O. Box 97 • Burnsville, North Carolina 28714 • Phone (828) 682-2420 e FAX (828) 682-7757 OEM not currently have the funding to undertake the replacement of the 10-inch interceptor line but understands it will need to be addressed in the future. Capacity at the existing WWTP should also be reviewed with the alternative to connect to the Town of Burnsville system. The WWTP operates at an average daily flow rate of 0.45 million gallons a day and it would appear that excess capacity is available to handle the expected flows. However, in order to preserve the current situation of excess capacity for the Town of Burnsville citizens, a significant impact fee will be required to help the Town regain the lost capacity that will be committed to the Sewer District if connected. This will allow the Town to expand the capacity of their -treatment plant when it does reach capacity without penalizing those citizens who had previously paid for the capacity reserved by the District. Furthermore, the District will be required to negotiate a bulk user.contract with the Town and pay monthly usage charges for the flow actually delivered. The Town understands the need to research various treatment alternatives for the District flows but it appears that the current capacity and condition of the sewer collection and treatment system is not capable of accepting the expected District flows. In addition, the Town would like to address the operation and maintenance of any such alternatives at a later date, should this alternative be considered. X" If I can be of further assistance please let me know. M no 0" M" IM No no Sincerely, TOWN OF BURNSVILLE Mr. Tom Storie Director of Public Works no R" M0 OR P" im MR am I" no No am David Grindstaff Mayor Jeanne Martin Towa Clerk April 14, 2004 Mr. Mike Apke McGill Associates, P.A. 55 Broad Street Asheville, North Carolina 28801 Dear Mr. Apke: Town of Burn8v& COU17 `IMS.- Ruth L. Bank$ BU1gN Charles Gillespie Of pruNry ` • s Heather Hockaday, 3C1 ��` Doyce G. McClure o +s� '" \0 y CAR°i� RE: Engineering Alternatives Analysis East Yancey Water and Sewer District Based on our recent conversation, it is my understanding that McGill Associates is in the process of completing an Engineering Alternatives Analysis (EAA) for the East Yancey Water and Sewer District to obtain a wastewater treatment plant discharge permit from the North Carolina Division of Water Quality. I understand that completion of the EAA requires an evaluation of all wastewater disposal options, including the connection of the new collection system to the Town of Burnsville's existing wastewater collection system. Connection to the Town's existing system would reduce the excess capacity that the Town currently has invested at our wastewater treatment plant: The Town of Burnsville would therefore require a capacity depletion fee of $3.00 per gallon of capacity to be paid by the District to the Town. This fee would preserve the current situation of excess capacity, and allow the Town to expand the capacity of the plant in the future without penalizing the citizens who have previously ' paid for the capacity at the plant. The District would also be required to pay monthly usage charges to the Town for the flow actually discharged into the system. The Town's current sewer rates for users outside the Town limits is $22.00 per 3,000 gallons. It is the Town's understanding that connection of the new system to our existing system is not a cost effective alternative, and is not the alternative that is recommended in the EAA. If you have any questions, please feel free to contact me at 828-682-2420. Sincerely, TOWN OF BURNSVILLE r/yvl Mr. Tom Storie, Director of Public Works P.O. Box 97 • Burnsville, North Carolina 28714 • Phone (828) 682-2420 • FAX (828) 682-7757 sw • INC. P.O. Box 180 - Micaville, NC 28755 - 828-675-4153 Fax 828-675-8602 ON October 31, 2003 Jeremy Cadeau, E.I. McGill Associates, P.A. 55 Broad Street Asheville, NC 28801 Mr. Cadeau, I understand your task of exploring all of the alternatives to construct a sewage treatment plant to serve the East Yancey County Water and Sewer District. Taylor Togs, Inc. owns and operates a small 10,000 GPD wastewater treatment facility and is not capable of or interested in accepting the expected 150,000 GPD flows from the East Yancey Water and Sewer District. Sincerely, Sam Cook Maintenance Manager am MW 4W No JDec•28. 2002 12:46PM No-5000 P. 2 TOE RIVER HEALTH DISTRICT 889 Greenwood Road Spruce Pine, NC 28777 Phone; 828-765.2238 Fax: 828-785-9082 Thomas E. Singleton, Health Director r December 27, 2002 Three have been numerous times in the past few years when individual located along 19B between Burnsville and Micuffle have been denied improvement permits or repair permits due to restrictive soils or space limitations. Sites in this area that have been unsuitable for subsudke discharge by this department are: Sites at Rocky Springs Heights Catalano Ford Kevin''s Country Carpet Ths area between old 19E and 19B Burnsville Elementary School Mt. View Motel Some sites at Windom Cove development Slagle's Office Complex Comihercial properties along 19E owned by Farrel %ghes, Bill Young, Pied Peterson, Allan Boone, Edd Cassida, Dennis Buchanan, A Jr. McIrtWe and Keith Presnell New Church in IV1.tcaville FM Mobile home park on BM Allen Branch Expansion of Hickory Springs On -going problems with aging sewage systems in Bill Young's mobile home park Mobile home park Old housing developments and mobile home parks in this area New housing developments and mobile home parks in this area Could more effectively use available land area i.e. more homes per acre This list is not intended to be inclusive of all problems encounter in the past but should be an indicator of ate, problems that may arise in the future. In previous years there have been approximmtely twelve alternative non -ground absorption treatment systems installed in the projected target area for this project. Including satellite pump syst=s, sand filter FM discharge and individual package plane. Therefore, there is no reason to believe that other problems will not arise in this area served by this project. Allan McCurry, ' Environmental Health specialists WEI AMIIa 0M Avery County Health Dept/ Home Coro Mitchell County Hieth Dept. Mitchell County Home Can Yancey County Health Dept Yancey County Homo Care • CAN DA A0. Box 326 Wand, NC 28557 W Forest 3ervioe Drive, Bulle A Bake*fle, NC 28708 130 Forest Servlca Drive, Suite D BekeisWle, NC 28706 10 avibs Avenue BumWlb, NC 28714 328 West Main 8(mal , Bumsvft(e, NC 28714 )aKh Dept, UB-733.6031 828.488.237i 628AB-3803 828-882.6118 ' Noma Caro 828-882-7825 name Care 82&733.1560 CAP/DA 82MB2.6370 No 12/27/2002 FRI 13:45 [TX/RX NO 68831 9 002 PROJECT: &w V,+,vcy-y j 79 PROJECT NO.: o/7e-3 ASSOCI EMcGATES RI DESCRIPTION: h(-7-. M-z - WmAe6i Dm,s-, * AA Engineering - Planning - Finance CALCULATED BY: 5�c, CHECKED BY: McGill Associates, P.A. P.O. Box 2259, Asheville, NC 28802 DATE: //c/o .3 SHEET NO. OF 55 Broad Street, Asheville, NC 28801 828-252-0575 Fax 828-2.52-2518 17 A* 4" LA r on Y i 60 • PROJECT: Vtm:.'Y WWT% � McGm PROJECT NO.: OJ%y3 0 it ASSOCIATES DESCRIPTION: T• ,. 2 ,. 21'r�+m.nay D!,S,qA Engineering - Planning • Finance CALCULATED BY: SpL CHECKED BY: MA McGill Associates, P.A. P.O. Box 2259, Asheville, NC 18802 q DATE: 55 Bad Street,Aslieville, NC28801828-252-057S Fax 818-252-2518 / �3 SHEET NO. 2- OF so Fkq I A I I I I I I I Flows to Waste Disposal Site Alt. No.2 Connection to Burnsville Using 85 GPD/capita Residential/Commercial, Recorded Industrial Flows, and Infiltration 0 Current Flow 1 2006 43,340 43,340 1.43% Growth Rate 108,350 2007 43,960 109,899 2 2008 0 44,588 111,471 2009 45,226 113,065 3 2010 6,300 52,173 130,432 2011 52,919 132,297 2012 53,676 134,189 2013 54,443 136,108 2014 55,222 138,054 4 2015 9,715 65,726 164,316 2016 66,666 166,665 2017 67,620 169,049 2018 68,586 171,466 2019 69,567 173,918 5 2020 6,980 77,542 193,855 2021 78,651 196,627 2022 79,776 199,439 2023 80,916 202,291 2024 82,074 205,184 6 2025 5,650 88,897 222,243 Rev. 19March04 Force Main From Waste Disposal Site to Burnsville Elementary Pump Station Pipe Diameter 6 (inches) _ Static Head 120 (feet) Length 20,000 (feet) Coefficient 140 Fittings Loss Coeff. Quanti Size in. Gate Valves 0.2 5 6 90 Bends 0.3 20 6 45 Bends 0.225 20 6 Tee Thru 0.2 1 6 Tee Branch 0.5 0 6 Check Valves 2.5 1 6 Outlet 1 1 6 Flow Increment 10 FLOW ( m) HEADLOSS (feet) ; MINOR LOSSES feet = TDH feet • Velocity Ft/sec PUMP DATA HP KW 60 7.13 0.11 127.24 0.68 3.06 2.281859 70 9.48 0.15 129.63 0.79 3.64 2.7122 80 12.13 0.19 132.33 0.91 4.24 3.164257 90 15.09 0.25 135.33 1.02 4.88 3.640649 100 18.34 0.30 138.64 1.13 5.56 4.143949 110 1 21.87 0.37 142.24 1 1.25 6.27 4.676686 120 25.69 0.44 146.13 1.36 7.03 5.241354 130 29.79 0.51 150.30 1.48 7.83 5.840413 140 34.17 0.60 154.76 1.59 8.68 6.476292 150 38.82 0.68 159.50 1.70 9.59 7.151396 160 43.74 0.78 164.52 1.82 10.55 7.868101 170 48.93 0.88 169.81 1.93 11.57 8.628762 180 54.39 0.98 175.38 2.04 12.65 9.435713 190 60.11 1.10 181.21 1 2.16 1 13.80 10.29126 200 66.10 1.22 187.31 2.27 15.02 11.19771 210 72.34 1.34 193.68 2.38 16.30 12.15734 220 78.84 1.47 200.32 2.50 17.66 13.17239 230 85.60 1.61 207.21 2.61 19.10 14.24512 240 92.61 1.75 214.36 2.72 20.62 15.37776 250 99.88 1.90 221.78 2.84 22.22 16.57252 260 107.40 2.05 229.45 2.95 23.91 17.83161 Pump Model: Speed: Discharge: Impeller: HP: Pump Calculation 2.1 Dana J. Bolden Revised 5/30/01 (based on work by J. McCracken) - . 0McGW ASSOCIATES Engineering • Planning • Finance McGill Associates, P.A. P.O. Box 2259, Asheville, NC 28802 55 Broad So eet, Asheville, NC28801 828-252.0575 Fax 828-252-2518 PROJECT: 6— U-%JTI::- PROJECTNO.: 0i74E DESCRIPTION: ELT, No • Z ProQIm iAn Dcd,3 A CALCULATED BY: SPL CHECKED BY: „M DATE: /Z/%/D3 - SHEET NO. S OF Flows to Burnsville Elementary Pump Station Alt. No.2 Connection to Burnsville Using 85 GPDlcapita Residential/Commercial, Recorded Industrial Flows, and Infiltration Phase New Flow (vim i otai mow jui-up i otai riow w► A.a reaK ractor 1-urLU 49848 Current Flow 1 2006 48,188 53,036 1.43% Growth Rate 132,590 2007 53,794 134,486 2 2008 15,360 69,924 174,809 2009 70,924 177,309 3 2010 6,300 78,238 195,594 2011 79,357 198,391 2012 80,491 201,228 2013 81,642 204,106 2014 82,810 207,025 4 2015 9,715 93,709 234,273 2016 95,049 237,623 2017 96,408 241,021 2018 97,787 244,467 2019 99,185 247,963 5 2020 6,980 107,584 268,959 2021 109,122 272,805 2022 110,683 276,706 2023 112,265 280,663 2024 113,871 284,677 6 2025 5,650 121,149 302,873 Rev. 19March04 Burnsville Elennentary PunnD Station and Force Main to OMC Pump Station Pipe Diameter 6 (inches) Static Head 80 (feet) Length 7,000 (feet) Coefficient 140 Fittings Loss Coeff. Quantity Size in. Gate Valves 0.2 3 6 90 Bends 0.3 10 6 45 Bends 0.225 10 6 Tee Thru 0.2 1 6 Tee Branch 0.5 0 6 Check Valves 2.5 1 6 Outlet 1 1 6 Flow Increment 10 tWP 1 Hr ADoa �IANOWLQ-S-S-- 'EsvpH&, 616 i, WPu 11 = , p 100 6.42 0.19 86.61 1.13 3.47 2.588736 110 7.65 0.23 87.89 1.25 3.88 2.889614 120 8.99 0.27 89.27 1.36 4.29 3.201834 130 10.43 0.32 90.75 1.48 4.73 3.526273 140 11.96 0.37 92.33 1.59 5.18 3.863796 150 1 13.59 0.43 94.02 1.70 5.65 4.21526 160 15.31 0.49 95.80 1.82 1 6.14 4.581512 170 17.13 0.55 97.68 1.93 1 6.66 4.963391 180 19.04 0.62 99.66 2.04 1 7.19 5.36173 190 21.04 0.69 101.73 2.16 7.75 5.777352 200 23.13 0.76 103.90 2.27 8.33 6.211076 210 25.32 0.84 106.16 2.38 8.94 6.663714 220 27.60 0.92 108.52 1 2.50 9.57 7.1360721 230 1 29.96 1.01 110.97 2.61 10.23 7.628951 240 32.42 1.10 113.51 2.72 10.92 8.143146 250 34.96 1.19 116.15 2.84 11.64 8.679448 260 37.59 1.29 118.88 2.95 12.39 9.238642 270 40.31 1.39 121.70 3.06 13.17 9.821511 280 43.11 1.50 124.61 3.18 13.99 10.42883 290 46.00 1 1�6l 12761 3.29 14.83 11 06137 300 48.98 i 7� +_I -_-- 30 70 130.70 - 1 340 15.72i 11.71991 Pump Model: Speed: Discharge: Impeller: HP: Pump Calculation 2.1 Dana J. Bolden Revised 5130101 (based on work by J. McCracken) PROJECT:�-PROJECT NO.: 0MCC� Y 3 DESCRIPTION: T /10 .Z , ' WNffi,ft" CdJo� ASSOCIATES ��,, Engineering • Planning • Finance CALCULATED BY: �O�— CHECKED BY: MA McGW Associates, PA. P.O. B=1259, AsheWfle, NC 28801 I0 55BroadStreet,Ash"ale,NC28801828.252-0575Fas828-252-2518 DATE: 1C-1 3 SHEET NO. OF .. Opf Yv�� ^STk7crl!7ry -. _.�„_ i._ ..... .....- - -row I N �1 a L-: h r TTT F lr,T C- 3;s < 71t' ✓�- 411 Flows to OMC Pump Station Alt. No.2 Connection to Burnsville Using 85 GPDlcapita Residential/Commercials Recorded Industrial Flows, and Infiltration Phase New Flow (GP) Total Flow (GP) Total Flow wl 2319000 Current Flow 3.6 Peak Factor (M D) 1 2006 43,340 274,340 1.43% Growth Rate 0.99 2007 278,263 1.00 2 2008 10,290 292,532 1.05 2009 296,715 1.07 3 2010 12,595 313,553 1.13 2011 318,037 1.14 2012 322,585 1.16 2013 327,198 1.18 2014 331,877 1.19 4 2015 9,715 346,338 1.25 2016 351,291 1.26 2017 356,314 1.28 2018 361,409 1.30 2019 366,577 1.32 5 2020 6,980 378,800 1.36 2021 384,216 1.38 2022 389,711 1.40 2023 395,284 1.42 2024 400,936 1.44 6 2025 5,650 412,319 1.48 Rev. 19March04 _ Existing Force Main From OMC to Gravity Alt. No.2 Connection to Town of Burnsville _ Pipe Diameter 8 (inches) Static Head 140 (feet) _ Length 6,000 (feet) Coefficient 140 Fittings Loss Coeff. Quantity Size in. Gate Valves 0.2 5 8 90 Bends 0.3 10 8 45 Bends 0.225 10 8 Tee Thru 0.2 1 8 Tee Branch 0.5 0 8 Check Valves 2.5 1 8 Outlet 1 1 8 Flow Increment 50 FLOW DLOSS MINOR LOSSES TDH VelocityPUMP HP KW m eet) feet (feet) (Ft/sec)DATA 680 7.06 2.91 189.97 4.34 51.78 38.61231 730 753.66 3.35 197.02 4.66 57.65 42.98861 780 0.66 3.83 204.49 4.98 63.93 47.67511 830 8.05 4.34 212.38 5.30 70.66 52.69001 880 5.82 4.87 220.70 5.62 77.85 58.05133 930 83.99 5.44 229.43 5.94 85.53 63.77696 980 92.53 6.05 238.58 6.26 93.72 69.88463 1030 101.45 6.68 248.13 6.57 102.44A97.68417 1080 110.75 7.34 258.09 6.89 111.73 1125 119.44 7.97 267.41 7.18 120.58 1175 129.45 8.69 278.14 7.50 131.001225 139.82 9.45 289.27 7.82 142.04 Pump Calculation 2.1 Dana J. Bolden - Revised 5/30/01 (based on work by J. McCracken) - McGill ASSOCIATES Engineering • Planning • Finance .� McGil(Associares, P.A. P.O. Box 2259, Asheville, NC 28802 55 Broad Sheet, Asheville, NC 28801 828-252-0575 Fax 828-252-2518 � � I PROJECT: d—• yynicay /jwTF PROJECT NO.: o/7y3 DESCRIPTION: &7' AV' Z CALCULATED BY: CHECKED BY: DATE: /ZI9/03 SHEET NO. OF I i 1 l 1 1 1 1 1 1 1 1 1 Flows to Burnsville 10-Inch Interceptor and WWTP Alt. No.2 Connection to Burnsville Using 85 GPD/capita Residential/Commercial, Recorded Industrial Flows, and Infiltration Phase New Flow (GPD) Total Flow (GPD) Total Flow w/ 3.6 Peak Factor (MQQj Current Flow 4509000 1 2006 43,340 493,340 1.43% Growth Rate 1.78 2007 500,395 1.80 2 2008 10,290 517,840 1.86 2009 525,246 1.89 3 2010 12,595 545,352 1.96 2011 553,150 1.99 2012 561,060 2.02 2013 569,083 2.05 2014 577,221 2.08 4 2015 9,715 595,190 2.14 2016 603,702 2.17 2017 612,335 2.20 2018 621,091 2.24 2019 629,973 2.27 5 2020 6,980 645,961 2.33 2021 655,198 2.36 2022 664,568 2.39 2023 674,071 2.43 2024 683,710 2.46 6 2025 5,650 699,137 2.52 At Min. Grade the following pipe capacities are as follows: 10 Pipe 1/2 Full Flow = 374,863 GPD 24" Pipe 1/2 Full Flow = 2.1 MGD 10" Pipe Full Flow = 937,086 GPD 24" Pipe Full Flow = 4.5 MGD 18" Pipe 1/2 Full Flow =1.2 MGD 18" Pipe Full Flow = 2.7 MGD Rev. 19March04 - McGill ASSOCIATES Engineering • Planning • Finance McGill Associates, P.A. P.O. Bm 2259, Asheville, NC 28802 55 BrwdStseet, Asheville, NC 28801 828-252-0575 F= 828-252-25I8 A an A m as am OR PROJECT: &r: �Y 6. PROJECT NO.: O/?Ys - DESCRIPTION: G06')79Z:- —%}LT, No, 5 CALCULATED BY: 'lc— CHECKED BY: MA 111IS1n3 Q&ISES DATE: �;:{dT SHEET NO. OF INFLUENT PUMP STATION (aD WWTP Pipe Diameter 6 (inches) Static Head 40 (feet) Length 200 (feet) Coefficient 120 Fittings Loss Coeff. Quantity Gate Valves 0.2 1 90 Bends 0.3 4 45 Bends 0.225 2 _ Tee Thru 0.2 Tee Branch 0.5 1 Check Valves 2.5 1 Outlet 1 1 Flow Increment 20 Size in. 6 6 6 6 6 6 6 FLOW s , 260 ;'HEADLOSS 1.43 MINOR LOSSES" feet, 0.79 TDH= feel 42.22 Velocity FtisecDAT%_ 2.95 PUMPS r HlR 4.40 K 3.281028 280 1.64 0.92 42.56 3.18 4.78 3.561553 300 1.86 1.05 42.91 3.40 5.16 3.848115 320 2.10 1.20 43.30 3.63 5.55 4.141106 340 2.35 1.35 43.70 3.86 5.96 4.440912 360 2.61 1.52 44.12 4.08 37 4.747922 380 2.88 1.69 44.57 4.31 79 5.062518 400 3.17 1.87 45.04 4.54 22 5.385084 420 3.47 2.06 45.53 4.77 67 5.716001 440 3.78 2.26 46.04 4.99 6.055641 460 4.10 2.47 46.58 5.22 59 112 6.404401 480 4.44 2.69 47.14 5.45 07 6.76264 500 4.79 2.92 47.71 5.67 56 7.130737 520 5.15 3.16 48.31 5.90 07 7.509067 540 5.52 3.41 48.93 6.13 59 7.898002560 5.91 3.67 49.57 6.35 13 8.297914 580 6.30 3.93 50.24 6.58 68 8.709173 600 6.71 4.21 50.92 6.81 12.25 9.112147 620 7.13 4.50 51.63 7.04 12.83 9.567206 640 7.56 4.79 52.35 7.26 13.43 10.01471 660 8.00 5.09 53.10 7.49 14.05 10.47504 Pump Model: Speed: Discharge: Impeller: HP: Pump Calculation 2.1 Dana J. Bolden Revised 5/30/01 (based on work by J. McCracken) INFLUENT PUMP STATION (W WWTP Pipe Diameter 8 (inches) Static Head 40 (feet) Length 200 (feet) Coefficient 120 Fittings Loss Coeff. Quantity Gate Valves 0.2 1 90 Bends 0.3 4 45 Bends 0.225 2 - Tee Thru 0.2 Tee Branch 0.5 1 Check Valves 2.5 1 Outlet 1 1 Flow Increment 20 Size in. 8 8 8 8 8 8 8 g. LQM4I ° 1.27 e.LeQSEPs 1.00 t _. Ef1se ? D(A1M !r' +8.81 520 42.27 3.32 6.57, 0109 540 1.36 1.08 42.44 3.45 9.19 6.850294 560 1.46 1.16 42.62 3.57 9.57 7.133503 580 1.55 124 4280 3.70 9.95 7.419838 600 1.33 42.99 3.83 10.34 7.709402 620 1.76 1.42 43.18 3.96 10.73 8.002299 640 1.87 1.52 43.38 4.08 11.13 8.298629 660 1.97 1.61 43.59 4.21 11.53 8.598495 680 2.09 1.71 43.80 4.34 11.94 8.902 700 2.20 1.81 44.01 4.47 12.35 9.209243 720 2.32 1.92 44.24 4.60 12.77 9.520327 740 2.44 2.03 44.47 4.72 13.19 9.835353 760 2.56 2.14 44.70 4.85 13.62 10.15442 780 2.69 2.25 44.94 F 4.98 14.05 10.47763 800 2.82 2.37 45.19 1 5.11 14.49 10.80509 820 2.95 2.49 45.44 5.23 14.93 11.13689 840 3.08 2.61 45.70 5.36 15.39 11.47314 860 3.22 2.74 45.96 5.49 15.84 11.81393 880 3.36 2.87 46.23 5.62 16.31 12.15936 900 3.50 3.00 46.50 5.74 16.78 12.50954 920 3.65 3.13 46.78 5.87 1 1 17.25 12.86457 Pump Model: Speed: Discharge: Impeller: HP: Pump Calculation 2.1 Dana J. Bolden Revised 5/30/01 (based on work by J. McCracken) c a- Influent Puma Station _ Phase 1 Phase 2 Qaverage 04 278 GPM Qpump 260.5 695 GPM Wet Well Diameter 10 am Using the formula Cycle Time = (Pump Run Time + Refill Time at Average Inflow) nL.___ w n"Yo f±Dl1A we fm am A� fW FM P" ma Well Dia. (ft.) 10 Volume/ft. (ft3) 78.54 Operating Depth (ft.) 1 Volume a@D Operating Depth (Gal.) 587.56 Pump Run Time (min.) 3.75 Refill Time (min.) 5.65 Total Cycle Time (minutes) 9.40 Cycles per Hour 6.38 10 78.54 1.25 734.45 4.69 7.06 11.75 5.10 10 78.54 1.5 881.33 5.63 8.47 14.11 4.25 10 78.54 1.75 1028.22 6.57 9.89 16.46 3.65 10 78.54 2 1175.11 7.51 11.30 18.81 3.19 10 78.54 2.25 1322.00 8.45 12.71 21.16 2.84 10 78.54 2.5 1 1468.89 9.39 14.12 23.51 2.55 •+■ ■W■ Volume/ft. (ft3) 78.54 Operating Depth (ft.) 2.5 Volumed Operating Depth (Gal.) 1468.89 Pump Run Time (min.) 3.52 Refill Time (min.) 5.28 Total Cycle Time (minutes) 8.81 Cycles per Hour 6.81 Well Dia. (ft.) 10 10 78.54 3 1762.67 4.23 6.34 10.57 5.68 10 78.54 3.5 2056.45 4.93 7.40 12.33 4.87 10 78.54 4 2350.23 5.64 8.45 14.09 4.26 10 78.54 4.5 2644.00 6.34 9.51 15.85 3.79 10 78.54 5 2937.78 7.05 10.57 17.61 3.41 10 78.54 5.5 3231.56 7.75 11.62 1 19.37 3.10 ow t pm on — APPENDIX D omm DOCUMENTATION OF LAND COSTS No mm on pm mq ow FM fm pim am - } McGill ASSOCIATES Engineering • Planning • Finance McGill Associates, P.A. P.O. Box 1259, Asheville, NC 28802 55 Broad Saret, Asheville, NC28801 828-151-0575 Fax 828-252-1518 No m s L n 04 1 PROJECT: �� c=t% WW / f PROJECT NO.: 00,13 DESCRIPTION: CnST OF LAID Aga)uh71cl%J CALCULATED BY: WO L CHECKED BY: /AA DATE: IZ.-/Zr`JD'& SHEET NO. OF .Search%Results Page I of I Price Lot Size County Restrictions $ 299,000 95.800 acres Yancey N Schedule a Showing Send Me Mortgage Information for this listing Printer Friendly Version Click Here MLS# 228820 Location Subdivision In City zone Listing Agency Burnsville Jacks creek N Premier Mtn. Properties, Inc. Description Located in Burnsville, NC, this Acreage is 95.800 acres. Contact Me for More Info Type: Land Suitable Use: Farmland, Pasture/Grazing, Timber/Tree Farm _ Utilities: Electric Restrictions: None Water: Spring Sewer: Rd Frontage Access:State Highway, Road Maint: Gravel Road Improvements: Area: Yancey/Mitchell Coun Topo Features: Pasture/Gardens, Roiling, Partially Wooded, Long Range Mountain, Open Improvements: Elem School:Yancey Cnty High School: Yancey County ABRS 1Rw6*• Courtesy of Premier Mtn. Properties, Inc. and Asheville Multiple Listings Service, Inc. Information Is deemed reliable but not guaranteed and is updated daily. Copyright 2002, Asheville Multiple Listing Service, Inc. All rights reserved. Database last updated December 21 2003 04:07:14 PM .Search -Results , Page 1 of 1 Schedule a Showing Send Me Mortgage Information for this listing Printer Friendly Version Click Here Price Lot Size County Restrictions MLS# $ 119,000 34.000 acres Yancey N 228888 Location Subdivision In City Zone Listing Agency Burnsville Jacks creek N Premier Mtn. Properties, Inc. Description Located in Burnsville, NC, this Acreage is 34.000 acres. �. Contact Me for More Info Type: Land Suitable Use: Farmland, Pasture/Grazing Utilities: Electric Restrictions: None Water: Spring Sewer: None Rd Frontage Access: Private Road Road Maint: Improvements: Area: Yancey/Mitchell Coun Topo Features: Pasture/Gardens, Partially Wooded, Stream/Creek/River _ Improvements: Elem School: Yancey Cnty High School: Yancey County ABRSRK`«'1PLdKy� Courtesy of Premier Mtn. Properties, Inc. and Asheville Multiple Listings Service, Inc. Information is deemed reliable but not guaranteed and Is updated daily. Copyright 2002, Asheville Multiple Listing Service, Inc. All rights reserved. Database last updated December 21 2003 04:07:14 PM —Search Results Page I of I Schedule a Shova Send Me Mortgage Information for this listing Printer Friendly Version Click Here Price Lot Size County Restrictions MLS# $ 139,900 44.420 acres Yancey Y 237238 Location Subdivision In City Zone Listing Agency Burnsville Burnsville N Premier Mtn. Properties, Inc. Description Located in Burnsville, NC, this Acreage is 44.420 acres. Contact Me for More Info Type: Land Suitable Use: Residential, MultioFamily Utilities: None Restrictions: Call Listing Office _ Water: Spring Sewer: None Rd Frontage Access: Private Road, Gravel Road Road Plaint: Property Owners Asso Improvements: Area: Yancey/Mitchell Coun Topo Features: Partially Wooded, Partially Steep Improvements: Elem School: Yancey Cnty High School: Yancey County ABRSM4opLdlys, Courtesy of Premier Mtn. Properties, Inc. and Asheville Multiple Listings Service, Inc. Information is deemed reliable but not guaranteed and is updated daily. Copyright 2002, Asheville Multiple Listing Service, Inc. All rights reserved. Database last updated December 21 2003 04:07:14 PM Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality March 8, 2004 Jeremy Cadeau McGill Associates P.O. Box 2259 Asheville, NC 28802 Subject: Return No. 2210 NPDES Permit Application/NCO087891 East Yancy Water/Sewer District South Toe River WWTP Yancey County Dear Mr. Cadeau: The Division received your NPDES permit application package for the proposed subject facility on January 13, 2004. Following review of the Engineering Alternatives Analysis (EAA), the Division is returning the application as incomplete for the items listed below. Due to high workload and space constraints, it is standard policy to return applications that require additional information. The application fee will be retained if you resubmit a completed NPDES application within six months. Please include a copy of this letter with your future resubmission. 1. Page 5. The EAA states that connection to the proposed treatment system is not expected to be mandatory unless required to connect by the County Health Department, and estimates that 50% of the customers will actually connect. What is the basis for a 50% connection rate? Has the County Health Department provided any data on the current number of failing septic systems in the district? 2. Page 6. The EAA incorporates a residential wastewater flow rate of 86 gpcd, based on water consumption data for the Town of Burnsville. Does this value account for consumptive loss? For comparison, the Construction Grants and Loans Program recommends that current residential flows based on water billing records subtract out 10% for consumptive loss, and uses a 70 gpcd residential flow rate for future residential population growth. 3. Page 19. The EAA must reference the basis for the Unit Prices presented in Table III-1 (e.g., past bids, manufacturer quotes, Means Construction, etc.). 4. Pa a 20. The cost estimate for Alternative 2 (Connection to POTW) incorporates a sewer use/capacity depletion charge of $3/ 1000 gallons. It is unclear how this charge was derived, since the letter from the Town of Burnsville did not include such information. 5. Page 24. Alternative 4 (Individual/Communitty Subsurface Systems) was considered technically infeasible and not costed out, due to unsuitable soils and currently failing septic systems in the project area. Please provide supporting documentation from the County Health Department regarding this determination. The soils report within the EAA states that soils on the 11-acre project site are deep, well -drained, and permeable, but there is no discussion as to whether this good soil is an anomaly within the district boundaries. If community systems are technically feasible, they will need to be costed out and compared to the cost for a direct discharge alternative. 6. Page 27. The EAA must reference the basis for the Unit Prices presented in Table III-3 (e.g., past bids, manufacturer quotes, Means Construction, etc.). 7. Page 29. The EAA must reference the basis for the Unit Prices presented in Table III-4 (e.g., past bids, manufacturer quotes, Means Construction, etc.). 8. Page 25. Alternative 5 (NPDES Surface Water Discharge) states that the project will be constructed in two phases- Phase 1 for a design capacity of 0.15 MGD and Phase 2 for an ultimate design flow of 0.4 MGD. It is unclear how the Phase 1 flow request for 0.15 MGD coincides with the six phase buildout scenario summarized previously in Table II-3 (Page 13). Table II-3 projects total wastewater flows of 0.048 MGD (in 2006), 0.049 MGD (in 2007), then increasing to 0.28 MGD (in 2008) after the Town of Burnsville diverts their existing OMC pump station flow to the proposed plant. Thus, a phased flow F N. C. Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 (919) 733-7015 ?YeCustomer Service 1�7 � 1 800 623-7748 N MENR NC4087891 East Yancey Water and Sewer District ,Page 2 limit of 0.15 MGD does not appear to be justified by the planned buildout scenario. Please explain the rationale for this phased flow request of 0.15 MGD. 9. Pa a 25. It is unclear whether the 7Q 10 and 30Q2 flow values were provided by the USGS or calculated by the consultant. If USGS provided the flow data, please append this data. Otherwise, please present the flow calculations. 10. Pa a 33. The EAA must reference the basis for the Unit Prices presented in Table II1-6 (e.g., past bids, manufacturer quotes, Means Construction, etc.). It is unclear why the cost for a tertiary 0.15 MGD WWTP is priced at $690,100 in Table III-6 (Phase 1, Drip Irrigation), but only $400,000 in Table III-3 (Phase I, Direct Discharge). Similarly, it is unclear why the cost for a tertiary 025 MGD WWTP is priced at $824,000 gpd in Table I1I-6 (Phase 2, Drip Irrigation), but only $650,000 in Table III-4 (Phase 2, Direct Discharge). 11. Page 34. The EAA must reference the basis for the Unit Prices presented in Table 11I-7 (e.g., past bids, manufacturer quotes, Means Construction, etc.). 12. Page 38. The EAA must reference the basis for the Unit Prices presented in Table 1I1-9 (e.g., past bids, manufacturer quotes, Means Construction, etc.). It is unclear why the cost for a secondary 0.15 MGD WWTP is priced at $483,000 in Table III-9 (Phase 1, Spray Irrigation), but only $400,000 for a tertiary 0.15 MGD WWTP in Table 111-3 (Phase 1, Direct Discharge). 13. Page 39. The EAA must reference the basis for the Unit Prices presented in Table 11I-10 (e.g., past bids, manufacturer quotes, Means Construction, etc.). If you have any questions about the contents of this letter or the NPDES permitting process, please call me at 919-733-5083, ext 543. Si erely 4,U om Belnick NPDES Unit cc: Ms. Michele Lawhern, District Manager, East Yancey Water and Sewer District, County Court House, Room 11. Burnsville, NC 28714 Ms. Julie Halgler, Dir. Water/Sewer Grants, NC Rural Economic Development Center. 4021 Carya Drive, Raleigh, NC 27610 Asheville Regional Office, Water Quality NPDES File