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HomeMy WebLinkAboutFinal_CE_TM Sewer to Davidson Homes_2021-10-05Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Page 2 After considering the diversion of flow from Main Street, west to the pump station, it was determined that the best feasible alternative would be to pump flow from the project site south along Gregory Circle to the Nutt Property which is currently being developed. From the Nutt property, flow would discharge to Pump Station SLS 8. See Appendix B for figures that depict the proposed and existing infrastructure necessary to achieve this modified option. 2.2.1 SLS 8 The capacity of the HRW SLS 8 is a critical component of the proposed service strategy. HRW confirmed the following data for SLS 8 to both Timmons Group (Engineer for Buies Creek Townhomes being developed on the Nutt property) and HIGHFILL. Table 2.1 – HRW SLS 8 Timmons Group reported a measured drawdown capacity at SLS 8 of 135.7 GPM and a paper flow for the Buies Creek Townhomes project of 30 GPM peak. Considering the flows provided by HRW, a peaking factor calculation adapted from the 10-State Standards population based peak factor chart using 100 gallons per day per capita unit flow was used to project the peak flow from the existing service area tributary to SLS 8. That calculation is as follows:  Peaking Factor (PF) = (18 + ((sqrt(Q))/316)) / (4 + ((sqrt(Q))/316)) o Q: Average Daily Flow in GPD = 8,000 GPD o PF = 4.27 The available capacity at SLS 8 is calculated as follows:  Available Capacity = 97.2 – 30 – (5.6 x 4.27) = 43.3 GPM As a result, adding the 30 GPM proposed from the Buies Creek Townhomes will leave 43.3 GPM available at SLS 8. (Considering the drawdown capacity of 135.7 GPM measured by Timmons Group, 81.8 GPM of available capacity potentially remains. Although this may require permitting with the NCDEQ to utilize.) Peak hourly flow calculated for the Davidson Home development of 153,000 GPD converts to 106.3 GPM (153,000 GPM / (24 hr/day) / (60 min/hr)). Neither SLS 8 firm capacity nor measured drawdown capacity are sufficient to receive the 106.3 GPM peak flow. 2.2.2 SLS 8 Upgrade An upgrade at SLS 8 is necessary to make the alternative feasible. Adding the calculated peak hourly flow from the Davidson Homes Development to the Buies Creek Townhomes peak and the current peak results in a targeted minimum capacity for SLS 8.  Target Capacity = 106.3 + 30 + (5.6 x 4.27) = 160.2 GPM o Round up to 165 GPM for future lift station design considerations Permitted Capacity (GPM) Average Day Flow (GPM) Max Day Flow (GPM) Force Main Dia. (IN) 97.2 5.6 24.3 4 Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Page 3 Capacity of the force main can limit the ultimate capacity of the lift station. The 4-inch force main capacity at minimum, intermediate and maximum velocities. Table 2.2 – 4-inch Force Main Capacity 165 GPM produces a velocity of 4.22 ft/sec in a 4-inch force main which is within the acceptable range of 2 – 8 ft/sec. Lidar contour data, GIS force main route and the target capacity were used to generate a system curve for SLS 8. Using 165 GPM as the future operating point, the TDH calculated reached approximately 115 ft. The existing pumping equipment is not expected to be capable of achieving this operating condition. Coordination with the Gorman Rupp sales representative resulted in a future pump selection that the station could be retrofitted with to increase performance to the necessary condition. Proposed pump data is included in Appendix C. 2.2.3 Downstream Sewer Capacity The SLS 8 force main discharges to an 8-inch gravity sewer main on the west side of the Campbell University campus. This main conveys flow west along Judge Taylor Road to Leslie Campbell Avenue then south across Highway 421. On the south side of Highway 421, the 8-inch main connects to a 12-inch gravity main that ultimately discharges into the HRW SLS 10B. A total distance of approximately 2,200 linear feet of 8-inch gravity sewer exists between the force main discharge location and the 12-inch gravity main. Per HRW GIS records, some segments of the 8-inch gravity are installed at the minimum allowable pipe slope of 0.40%. HRW requires that calculated peaks flow not exceed pipe capacity at 2/3 full. For an 8-inch pipe installed at minimum grade using Mannings friction factor of n=0.013, this is calculated to be 328,300 GPD. A roof top survey was completed to evaluate the potential flow from existing services that are tributary to the 8-inch gravity mains. It appears that portions of the drainage area include University buildings. Determining paper flow for these facilities can be challenging as their capacity and uses are not always easily determined. A preliminary tally of the structures within the drainage area results in an expected paper flow of 166,250 GPD peak. With the future peak flow from SLS 8 at 165 GPM, or 237,600 GPD and 166,250 GPD peak flow calculated from the service area tributary to the existing 8-inch gravity sewer, the 2/3 pipe full capacity limitation is exceeded by 75,550 GPD. The anticipated peak flow however, is well below the calculated full pipe capacity of 490,000 GPD. Appendix D includes a schematic of the service area of the 8-inch gravity sewer downstream of SLS 8 along with a table of the flows projected in the paper flow analysis. The 8-inch gravity discharges to a 12-inch gravity main on the south side of Hwy 421. If installed at a minimum slope of 0.22% a nominal 12-inch diameter gravity main has a capacity of 864,000 GPD flowing 2/3 full. Projected peak flow from the properties tributary to the 12-inch main, based on GIS data, reaches approximately 166,250 GPD. Considering this along with the current (166,250 GPD) and future Velocity (ft/sec) 2.0 5.0 8.0 Capacity (GPM) 78 195 313 Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Page 4 (237,600 GPD) flows upstream, the 12-inch gravity has ample capacity to receive flow from the Davidson Homes project without exceeding the HRW 2/3 pipe full limitation. Appendix D includes a table of the flows projected for the existing services tributary to the 12-inch gravity main. 2.2.4 Gravity from SLS 8 Currently, the Buies Creek Townhomes project is planning 8-inch gravity sewer from SLS 8 to their site. Deeded easements will be provided to give HRW access for operation and maintenance of the mains on the property. This gravity system is proposed to receive flow from the future Davidson Homes force main. A short extension will bring the gravity sewer from the Townhomes site to within the public right of way along Gregory Circle. As described above, an 8-inch gravity main installed at 0.40% minimum slope can convey 340 GPM peak flow. Nearly 110 GPM from the Davidson Homes development and 30 GPM from the Buies Creek Town Homes leaves approximately 200 GPM available for additional development. Although SLS 8 would require further upgrade, this new 8-inch gravity sewer from SLS to Gregory Circle would support additional development. The table below depicts volumes of development potentially supported for an 8-inch as currently proposed and for 10-inch and 12-inch in the event HRW desires to upsize it in preparation for future growth opportunities. Table 2.3 – Future Development new Gravity Sewer from SLS 8 to Gregory Circle Approximately 200 acres of undeveloped property exists that will be tributary to the new gravity sewer main. This area could likely support additional development. Upsizing the gravity main at this time may be desired by HRW if continued development is anticipated. Appendix E includes a schematic of the service alternative with acreage of undeveloped properties upstream of Gregory Circle that may be identified for future development. Section 3 - Opinion of Probable Construction Cost (OPCC) A OPCC has been developed for serving the proposed development via SLS 10B and the western outfall to SLS 8. Collectively, about $1,430,000 is projected to make the minimum upgrades necessary. Appendix F includes detailed OPCCs for each segment of the sewer service alternative. Section 4 - Conclusion Development of the proposed project by Davidson Homes on the north side of Buies Creek is expected to add 153,000 GPD peak flow to the HRW wastewater collection system. Flow will be conveyed to the HRW collection system via a new pumping station located on the site. From the pump station and new force main will extend south along Gregory Circle and discharge into new gravity sewer being installed to serve Type of Development # Additional Units, 8-inch Gravity Sewer # Additional Units, 10-inch Gravity Sewer # Additional Units, 12-inch Gravity Sewer 3 bed residential 320 608 976 2 bed residential 480 912 1,464 Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Page 5 the Buies Creek Townhomes project located on the Nutt Property. This gravity sewer will discharge in to the existing HRW pump station SLS #8. SLS #8 will require an upgrade to the pumping equipment to increase pumping capacity from its current permitted capacity of 97.2 GPM to 165 GPM. The existing 4-inch force main is not expected to require any modifications. The SLS #8 force main discharges to existing 8-inch gravity sewer that has a capacity in accordance with HRW 2/3 pipe full capacity limitation of 328,300 GPD. The projected peak flow is expected to exceed this rated capacity by 23%, however, the pipe full capacity of 490,000 GPD is sufficient to convey the additional flows. From the 8-inch gravity sewer, flow discharges to a 12-inch gravity main which has sufficient capacity in accordance with HRW guidelines to convey the additional flows to HRW pump station SLS 10B. Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Appendix A Appendix A Highfill Memorandum, Sewer Analysis Summary Harnett County GIS, Harnett County Public Utilities Ha rn ett GIS L E G E N D Recycle Center Landfills Surrounding County Boundaries Federal Property City Limits Harnett County Boundary Airport MajorRoads Interstate NC US Roads Railroad Parcels CapeFearRiverNOT FOR LEGAL USE0 0.15 0.3 0.450.075 Miles 1 inch = 1,750 feet ² April 15, 2021GIS/E-911 Addressing 61,200 162,200 379,200 379,200 379,200 640,000 153,000 405,500 1,483,500 1,404,000 1,404,000 1,600,000 864,000 392,000 864,000 864,000 864,000 2,020,000 0 500000 1000000 1500000 2000000 Proposed Davidson Homes to Main St. 8- inch Sewer Main St. 8-inch Sewer to 12-inch Sewer at Traffic Circle Traffic Circle to Meter Site (215 Marshbanks St.) Meter Site Comparison (215 Marshbanks St.) Meter Site to SLS 10B SLS 10B Comparison Existing Conditon, Buies Creek Sewer Ex ADF (gpd) Ex MDF (gpd) Ex Max Day Capacity (gpd) 61,200 162,200 219,200 219,200 219,200 480,000 153,000 405,500 565,500 486,000 486,000 1,200,000 864,000 392,000 864,000 864,000 864,000 2,020,000 0 500000 1000000 1500000 2000000 Proposed Davidson Homes to Main St. 8- inch Sewer Main St. 8-inch Sewer to 12-inch Sewer at Traffic Circle Traffic Circle to Meter Site (215 Marshbanks St.) Meter Site Comparison (215 Marshbanks St.) Meter Site to SLS 10B SLS 10B Comparison SLS 4 Relocation, Buies Creek Ex ADF (gpd) Ex MDF (gpd) Ex Max Day Capacity (gpd) 61,200 162,200 162,200 162,200 162,200 480,000 153,000 405,500 405,500 486,000 486,000 1,200,000 864,000 392,000 864,000 864,000 864,000 2,020,000 0 500000 1000000 1500000 2000000 Proposed Davidson Homes to Main St. 8- inch Sewer Main St. 8-inch Sewer to 12-inch Sewer at Traffic Circle Traffic Circle to Meter Site (215 Marshbanks St.) Meter Site Comparison (215 Marshbanks St.) Meter Site to SLS 10B SLS 10B Comparison SLS 4 & SLS 7 Relocation, Buies Creek Ex ADF (gpd) Ex MDF (gpd) Ex Max Day Capacity (gpd) Harnett County GIS, Harnett County Public Utilities Ha r nett GI S Recycle Center Landfills Surrounding County Boundaries Federal Property City Limits Harnett County Boundary Airport MajorRoads Interstate NC US Roads Railroad Parcels CapeFearRiver 0 1,300 2,600650Feet 1 inch = 1,505 feet ² June 30, 2021NOT FOR LEGAL USE .GIS/E-911 Addressing Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Appendix B Appendix B Proposed and Existing Infrastructure to Achieve Modified Service Option Harnett County GIS, Harnett County Public Utilities Ha rn ett GIS L E G E N D Recycle Center Landfills Surrounding County Boundaries Federal Property City Limits Harnett County Boundary Airport MajorRoads Interstate NC US Roads Railroad Parcels CapeFearRiverNOT FOR LEGAL USE0 0.15 0.3 0.450.075 Miles 1 inch = 1,750 feet ² April 15, 2021GIS/E-911 Addressing Harnett County GIS, Harnett County Public Utilities Ha r nett GI S Recycle Center Landfills Surrounding County Boundaries Federal Property City Limits Harnett County Boundary Airport MajorRoads Interstate NC US Roads Railroad Parcels CapeFearRiver 0 1,300 2,600650Feet 1 inch = 1,505 feet ² June 30, 2021NOT FOR LEGAL USE .GIS/E-911 Addressing Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Appendix B Appendix C Potential Pump for SLS 8 Copyright Gorman‐Rupp Pumps 2020 PAGE 2525Specification Data PUMP SPECIFICATIONS Size: 4” x 3” (101,6 mm x 76,2 mm).** Casing: Gray Iron 30. Maximum Operating Pressure 127 psi (876 kPa).* Semi‐Open Type, Two Vane Impeller: Ductile Iron 65‐45‐12. Handles 2.50” (63,5 mm) Diameter Spherical Solids. Impeller Shaft: Alloy Steel 4150. Replaceable Eradicator Wear Plate: Carbon Steel ASTM A36. Removable Adjustable Cover Plate: Gray Iron 30. Removable Inspection Cover Plate: Gray Iron 30. Externally Removable Flap Valve: Neoprene w/Nylon and Steel Reinforcing. Suction Flange/Flap Valve Seat: Gray Iron 30. Bearing Housing: Gray Iron 30. Seal Plate: Gray Iron 30. Shaft Sleeve: Alloy Steel 4130. Radial and Thrust Bearings: Open Double Row Ball. Bearing and Seal Cavity Lubrication: SAE 30 Non‐Detergent Oil. Gaskets: Buna‐N, Compressed Synthetic Fibers, Vegetable Fiber, PTFE, Cork and Rubber. O‐Rings: Buna‐N. Hardware: Standard Plated Steel. Brass Pressure Relief Valve. Bearing and Seal Cavity Oil Level Sight Gauges. Optional Equipment: Automatic Air Release Valve. High Pump Temperature Shutdown Kit. Cartridge Seal w/Stainless Steel Sleeve. 120/240 Volt Casing Heater. **Optional Gray Iron 30 Flanges Available as Follows (See Price Sheets): 4” and 3” Female NPT Suction/Discharge Flange Kits. 4” and 3” ASA Suction/Discharge Spool Flange Kits. 200 mm and 150 mm DIN 2527 (PN 16) Suction/Discharge Spool Flange Kits. Sec. 55 Self Priming Centrifugal Pump Model V3C60SC‐B Size 4” x 3” SEAL DETAIL Cartridge Type, Mechanical, Oil‐Lubricated, Double Floating, Self‐Aligning. Silicon Carbide Rotating and Stationary Faces. Stainless Steel 316 Stationary Seat. Fluorocarbon Elastomers (DuPont Viton or Equivalent). Stainless Steel 18‐8 Cage and Spring. Maximum Temperature of Liquid Pumped, 160 F (71 C).* *Consult Factory for Applications Exceeding Maximum Pressure and/or Temperature In­ dicated.SEAL ASSEMBLY IMPELLER IMPELLER SHAFT DISCHARGE COVER PLATE SUCTION FLANGE/FLAP VALVE SEAT CASING FILL PORT PRESSURE RELIEF VALVE JULY 2020Ultra V Series Basic Pump VARIOUS PATENTS APPLY GORMAN‐RUPP PUMPS www.grpumps.com Specifications Subject to Change Without Notice Printed in U.S.A. ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎ ÎÎÎ ÎÎ ÎÎ ÎÎ ÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎ ÎÎ Î Î Î Î Î ÎÎ ÎÎ Î Î Î Î ÏÏÏ Ï Ï ÏÏ ÏÏÏÏ ÏÏ ÏÏÇ Ì Ì Ì ÌÇ ÇÇ ÇÇ Ç Ç Ç ÇÇÇ Ç ÇÇÇ Ç Ç Ç Ç Ç Ç ÇÇÇ ÇÇ Ç Ç ÇÇ ÇÇ ÇÇÇ ÇÇÇ Ç Î ÎÏ Ï Ç ÇÌ Ì Ì Ç Ç Ç Ï ÏÌ Ì ÏÏ ÏÏ ÏÏ ÏÏ ÏÏ ÌÌÌ ÌÌÌ ÌÌÌ ÌÌÌ ÌÌÌ Ï Ï Ï Ï ÎÎ ÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎ ÎÎÎ ÎÎ ÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ Ï Ï ÏÏÏ ÏÏÏ ÏÏÏ ÏÏÏÇ Ç Ç Î Î Î Ï Ï Ç Ç Ç Ì Ï Ï Ï Ï Ï Ï Ï Ï Ï Ì Ì Ì Ì Ì Ì Ì Ç Ç INSPECTION COVER BALL BEARINGS SEAL PLATE FLAP VALVE WEAR PLATE LIP SEALS Equipped With PHOTO NOT AVAILABLE AT TIME OF PUBLISHING Copyright Gorman‐Rupp Pumps 2020 Specification Data APPROXIMATE DIMENSIONS and WEIGHTS SECTION 55, PAGE 2525 NET WEIGHT: 650 LBS. (295 KG.)* SHIPPING WEIGHT: 700 LBS. (317 KG.)* EXPORT CRATE: 13.5 CU. FT. (0,38 CU. M.) *WEIGHTS DO NOT INCLUDE OPTIONAL FLANGE KITS. DIMENSIONS: INCHES [MILLIMETERS] 18.00/[457.2] RECOMMENDED FOR REMOVAL OF BACK COVER PLATE 10.50/[266.7] REQUIRED FOR REMOVAL OF BACK COVER PLATE* .69/[17.5] DIA 4 HOLES .38/[9.6] X .19/[4.8] X 4.00/[101.6] LG USEABLE KEYWAY * OPTIONAL 3.00 NOMINAL ASA OR 80 MM DIN 2527 (PN16) DISCHARGE SPOOL FLANGES STANDARD SUCTION: 4.00-8 NPT OPTIONAL 4.00 NOMINAL ASA OR 100 MM DIN 2527 (PN16) SUCTION SPOOL FLANGES 20.00[ 508.0] .75[ 19.0] 9.25[235.0] 18.50[ 469.9] 19.88[ 504.8] 30.66[ 778.8]TO ASAFLANGE 9.38[238.1]1.50[ 38.1]DIA 4.93[ 125.1] 1.94[49.1] 1.00[25.4]10.75[ 273.0]12.64[ 321.1]APPROX 35.55[ 903.0]TO ASA FLANGE 30.71[ 780.0]TO STANDARDNPT SUCTION 35.40[ 899.3]TO DIN FLANGE 9.25[ 235.0] 24.62[ 625.5] 25.85[ 656.6]TO NPTFLANGE28.22[ 716.9]30.69[ 779.6]TO DINFLANGE 60 HERTZ PERFORMANCE BASED ON WATER GORMAN‐RUPP PUMPS www.grpumps.com Specifications Subject to Change Without Notice Printed in U.S.A. Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Appendix D Appendix D Existing Flow Evaluation, 8-inch Gravity Sewer Downstream of SLS 8 Preliminary Downstream Paper Flow Evaluation 9/24/2021, cde Property ID Description Acreage Flow Rate ADF 4579 Historic, JA Campbell House (assume 2 employees)1.33 25 gpd/employee 50 4695 1639 SF residence, Cambell University 360 gpd 360 25 2448 SF residence 0.67 360 gpd 360 4624 1767 SF residence 0.45 360 gpd 360 4644 1296 SF residence 0.44 360 gpd 360 4678 3005 SF residence 0.84 360 gpd 360 4744 1932 SF residence 0.74 360 gpd 360 4919 Exxon Gas Station, Hwy 421 (assume 5 fixtures)0.88 250 gal/fixture 1250 230 & 260 Luby Wood Hall (174 rooms)9.07 60 gpd (2T boarding school)10440 Bob Barker Hall (300 residents) 60 gpd (2T boarding school)18000 70 2211 SF residence 1.11 360 gpd 360 90 2152 SF greek house 0.62 360 gpd 360 141 & 159 1176 SF residence 0.67 360 gpd 360 181 2183 SF greek house 0.66 360 gpd 360 207 & 209 2421 SF Greek House 0.72 360 gpd 360 233 1816 SF residence 1.05 360 gpd 360 271 Church (assume 400 seats)2.52 5 gal/seat 2000 Child Care (100 children & employees assumed)25 gpd/person 2500 53 3528 SF residence 1.17 360 gpd 360 89 1276 SF residence 0.54 360 gpd 360 91 1720 SF residence 0.38 360 gpd 360 129 4596 SF John Pearson Infirmary (2 practitioners assumed)0.47 250 gpd/practitioner 500 220 1984 SF residence 0.24 360 gpd 360 188 984 SF residence 0.37 360 gpd 360 172 1326 SF residence 0.29 360 gpd 360 152 1550 SF residence 0.44 360 gpd 360 130 1960 SF greek house 0.39 360 gpd 360 77 2371 SF residence 1.08 360 gpd 360 99 1435 SF residence 1.1 360 gpd 360 Leland Circle Apts (43 units), Campbell University 5.77 240 gpd/unit 10320 197 1678 SF residence 0.53 360 gpd 360 Creekside Apts (9 units), Campbell University 1.04 240 gpd/unit 2160 Butler Chapel (approx 400 seats), Campbell University 5 gal/seat 2000 McLeod Admission & Financial Aid Center (50 employees assumed)25 gpd/employee 1250 Marshbanks Hall, Campbell University (10% of 6,500 enrollment assumed)10 gpd/student 6500 Day Hall, Campbell University (50 employees assumed)25 gpd/employee 1250 Subtotal ADF (GPD)66,500 Subtotal MDF (GPD, PF = 2.5)166,250 *Flow rates are projections based on roof top evaluation using aerial imagery only. Actual uses, sizes and resulting flow projections may vary. Preliminary Downstream Paper Flow Evaluation - Tributary to 12-inch Gravity 9/24/2021, cde Property ID Description Acreage Flow Rate ADF 36 Single Family Homes, Lynch Ave, Powell Ave, Burkot Rd, Pearson Rd (assume 3 bedrooms)360 gpd 12960 Stadium View Student Housing (85 parking spaces = 85 rooms) 60 gpd (2T boarding school)5100 Barker Lane Stadium (5,500 capacity)5 gpd/seat 27500 Stadium Field House (125' x 150')50 gpd/100 sqft 9375 Subtotal ADF (GPD)54,935 Subtotal MDF (GPD, PF = 2.5)137,338 *Flow rates are projections based on roof top evaluation using aerial imagery only. Actual uses, sizes and resulting flow projections may vary. Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Appendix E Appendix E Future Service Potential North of Gregory Circle Harnett County GIS, Harnett County Public Utilities Ha r nett GI S Recycle Center Landfills Surrounding County Boundaries Federal Property City Limits Harnett County Boundary Airport MajorRoads Interstate NC US Roads Railroad Parcels CapeFearRiver 0 1,300 2,600650Feet 1 inch = 1,505 feet ² June 30, 2021NOT FOR LEGAL USE .GIS/E-911 Addressing Technical Memorandum Sewer Capacity Analysis, Davidson Homes – Buies Creek, NC HIGHFILL | Appendix E Appendix F Detailed OPCCs OPINION OF PROBABLE CONSTRUCTION COST Jun-21 Buies Creek Sewer Capacity Increase by: CDE 7/1/2021 HIEPC PROJECT NO.: CUR2101 chk: Extended Item No Units Mat'l/Equip Lab Equip+Lab Total New PS & FM by Davidson Homes Pump Station (110 gpm) Misc. site work (clearing, grading, bollards, fill dirt, excavation, etc.)1 LS 25,000$ 25,000$ Fence 200 LF 50$ 10,000$ 16' Fence double seing gate 1 EA 5,000$ 5,000$ Wetwell, 6' dia concrete 1 LS 30,000$ 30,000$ Valve vault 1 LS 22,000$ 22,000$ Excavation 1 LS 12,000$ 12,000$ Concrete (pads, supports, etc.) 25 CY 500$ 12,500$ Duplex submersible pumps, guide rails, base elbows, controls, etc.1 LS 57,600$ 57,600$ Misc. piping, guages, spool pieces, fittings 1 LS 20,000$ 20,000$ 4-inch plug valve 2 EA 5,000$ 10,000$ 4-inch check valve 2 EA 5,000$ 10,000$ Yard hydrant, BFP & water meter 1 LS 7,500$ 7,500$ Gravel surface 65 TON 50$ 3,250$ Painting 1 LS 8,000$ 8,000$ Engine driven standby generator with ATS 1 LS 75,000$ 75,000$ SCADA 1 LS 12,000$ 12,000$ Electrical installation 1 LS 75,000$ 75,000$ Force Main 4-inch SSFM 8000 LF 35$ 280,000$ 12-inch casing by bore & jack 100 LF 300$ 30,000$ Air release valve 1 EA 7,500$ 7,500$ Misc driveway repairs 90 SY 40$ 3,600$ Stabilization stone 30 TON 50$ 1,500$ Select backfill 120 CY 50$ 6,000$ Erosion Control 1 LS 25,000$ 25,000$ Gravity Sewer 8-inch Gravity sewer 300 LF 80$ 24,000$ 4' Dia SSMH (SSFM discharge) 1 EA 7,500$ 7,500$ Mobilization/Bonds/Insurance 5% 38,998$ Sub-Total 819,000$ Contingency 20% 164,000$ Total Construction (2021 dollars) 983,000$ DRAFT CUR2101_DH PS FM OPCC_CE_2021-07-01 HIEPC Proj No. KHA0601 Printed: 9/8/2021 OPINION OF PROBABLE CONSTRUCTION COST Jun-21 Buies Creek Sewer Capacity Increase by: CDE 7/1/2021 HIEPC PROJECT NO.: CUR2101 chk: Extended Item No Units Mat'l/Equip Lab Equip+Lab Total SLS8 upgrade to 200 gpm Pump and Controls Upgrade 1 LS 250,000$ 250,000$ Standby Generator Upgrade 1 LS 60,000$ 60,000$ Electrical upgrades 1 LS 45,000$ 45,000$ Mobilization/Bonds/Insurance 5% 15,500$ Sub-Total 371,000$ Contingency 20% 74,000$ Total Construction (2021 dollars) 445,000$ DRAFT CUR2101_DH PS FM OPCC_CE_2021-07-01 HIEPC Proj No. KHA0601 Printed: 9/8/2021