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WQ0008659_Application_20200624
EST. 1842 Union County Public Works 500 North Main Street Suite 400 Monroe, NC 28112 T. 704-296-4210 www.unioncountync.gov Transmittal To: NC Department of Environmental Quality Division of Water Resources - Mooresville Regional Office 610 East Center Avenue Mooresville, N.C. 28115 RECEIVEDiNCDENR/DWF JUN 0 if, 2020 WQROS MOORESVILLE REGIONAL OFFICE Attention: Date: May 29, 2020 Regarding: Sanitary Sewer serving Stevens Mill Subdivision (Permit #WQ0008659) Pump Station #1 Decommissioning We are sending you: ❑ Copy of letter ❑ Prints © Other ❑ Plans ❑ Shop Drawings Copies Date No. Description 1 4/27/2020 Cover Letter 1 5/27/2020 Fast Track Application 1 5/27/2020 Copy of Fast Track Application 1 USGS Topo Map 1 Street Level Map 1 5/27/2020 Flow Tracking Form 1 12/15/1993 Existing Sewer Permit #WQ0008659 1 4/29/2020 2758 $480.00 Check (Application Fee) These are transmitted and checked below: z For approval ❑ Remarks: Signed: 184211 Received by: h' C pA "ECERt6'l CQOi�'�WDWR JON 0 '1 2ja; () 77��qq�� WQROS YARBROUGH—WILLIAMS & HOULE, 1'1` V9SVILLEREGIONALOFFICE Planning • Surveying • Engineering NCBELS C-0475 SC COA332 April 27, 2020 NCDEQ/ DWR Water Quality Section Mooresville Regional Office 610 E. Center Avenue Mooresville, North Carolina 28115 Re: Stevens Mill Subdivision (Permit No. WQ0008659) Wastewater Collection System Extension Union County Public Works Union County, North Carolina Dear Sirs: The enclosed submittal package for the referenced project consists of modifying the existing permit to decommission Pump Station #1 and construct a proposed 8" gravity sanitary sewer main to serve existing and future residential communities. The collection system will be a public system owned and operated by Union County Public Works. 0 flow is to be allocated with this project. The package contains the following items: ➢ Application (FTA 04-16) -1 original, 1 copy ➢ Cover Letter ➢ Application Fee $ 480.00 ➢ Form FTSE 10-18 ➢ Site Maps If you should have any questions or need additional information, feel free to give me a call. Sincere , i I Vincent G. Keene, PE President 730 Windsor Oak Court, Charlotte, NC 28273 • P.O. Box 1198, Pineville, NC 28134 + 704.556.1990 • fax 704.556.0505 CD c .� O 7 U) .E E O U 0 � U) n � @ c 3 » c � State of North Carolina DWR Department of Environmental Quality Division of Water Resources 15A NCAC 02T .0300 — FAST TRACK SEWER SYSTEM EXTENSION APPLICATION Division of Water Resources FTA 04-16 & SUPPORTING DOCUMENTATION Application Number: VW �`n—�J tR o be completed by MR) JUN G- 1 2720 All items must be completed or the application will be returned WQROS 1. APPLICANT INFORMATION: MOORESVILLE REGIONAL OFFIC5_ 1. Applicant's name: Union County Public Works (company, municipality, HOA, utility, etc.) 2. Applicant type: ❑ Individual ❑ Corporation ❑ General Partnership ❑ Privately -Owned Public Utility ❑ Federal ® State/County ❑ Municipal ❑ Other 3. Signature authority's name: Crustal Panico per 15A NCAC 02T .0106(b) Title: New Development Program Manage- 4. Applicant's mailing address: 500 N Main Street, Suite 408A City: Monroe State: NC Zip: 28112- 5. Applicant's contact information: Phone number: (704) 296-4239 Email Address: crystal.panico cr,unioncoun , nc. og_v II. PROJECT INFORMATION: I. Project name: STEVENS MILL SUBDIVISION GRAVITY SEWER AND PUMP STATIONS 2. Application/Project status: ❑ Proposed (New Permit) ® Existing Permit/Project If a modification, provide the existing permit number: WQ0008659 and issued date: 12/15/93 If new construction but part of a master plan, provide the existing permit number: WQ00 3. County where project is located: Union 4. Approximate Coordinates (Decimal Degrees): Latitude: 35.0822.8° Longitude:-80.3707.3° 5. Parcel ID (if applicable): 08324003 (or Parcel ID to closest downstream sewer) Ill. CONSULTANT INFORMATION: l . Professional Engineer: Vincent G. Keene License Number: 17637 Firm: Yarbrough -Williams & Houle, Inc. Mailing address: P.O. Box 1198 City: Pineville State: NC Zip: 28134- Phone number: (704) 556-1990 Email Address: VinceK@y-wh.com IV. WASTEWATER TREATMENT FACILITY (WWTF) INFORMATION: 1. Facility Name: 12 MILE CREEK W WTP Permit Number: NCO085359 Owner Name: UNION COUNTY PUBLIC WORKS V. RECEIVING DOWNSTREAM SEWER INFORMATION (if different than WWTF): 1. Permit Number(s): WQ0037718 Downstream (Receiving) Sewer Size: 8 inch System Wide Collection System Permit Number(s) (if applicable): WQCS_._ Owner Name(s): UNION COUNTY PUBLIC WORKS FORM: FTA 04-16 Pagel of5 VI. GENERAL REQUIREMENTS 1. If the Applicant is a Privately -Owned Public Utility, has a Certificate of Public Convenience and Necessity been attached? ❑ Yes ❑No ®N/A 2. If the Applicant is a Developer of lots to be sold, has a Developer's Operational Agreement (FORM: DEV) been attached? ❑ Yes ❑No ®N/A 3. If the Applicant is a Home/Property Owners' Association has an Operational Agreement (FORM: HOA) been attached? ❑ Yes ❑No ®N/A 4. Origin of wastewater: (check all that apply): ® Residential Owned ❑ Retail (stores, centers, malls) ❑ Car Wash ❑ Residential Leased ❑ Retail with food preparation/service ❑ Hotel and/or Motels ❑ School / preschool / day care ❑ Medical / dental / veterinary facilities ® Swimming Pool /Clubhouse ❑ Food and drink facilities ❑ Church ❑ Swimming Pool/Filter Backwash ❑ Businesses / offices / factories ❑ Nursing Home ❑ Other (Explain in Attachment) 5. Nature of wastewater: 100 % Domestic/Commercial % Commercial % Industrial (See 15A NCAC 02T .0103(20)) *Is there a Pretreatment Program in effect? ❑ Yes ® No 6. Has a flow reduction been approved under 15A NCAC 02! .01140? ❑ Yes ® No ➢ if yes provide a copy of flow reduction approval letter 7. Summarize wastewater generated by project: Establishment Type (see 02T.0114(1)) Daily Design Flow',b No. of Units Flow gal/ GPD gal/ GPD gal/ GPD gaV GPD gal/ GPD gal/ GPD Tolal 0 GPD a See 15A NCAC 02T 0114(b) (d) (e)(1) and (e)(2) for caveats to wastewater design flow rates (i.e., minimum flow per dwelling; proposed unknown non-residential development uses; public access facilities located near high public use areas; and residential property located south or east of the Atlantic Intracoastal Waterway to be used as vacation rentals as defined in G.S. 42A-4). b Per 15A NCAC 02T .0114(c), design flow rates for establishments not identified [in table 15A NCAC 02T.0114] shall be determined using available flow data, water using fixtures, occupancy or operation patterns, and other measured data. 8. Wastewater generated by project: 0 GPD (per 15A NCAC 02T .0114) ➢ Do not include future flows or previously permitted allocations If permitted flow is zero, indicate why: ❑ Pump Station or Gravity Sewer where flow will be permitted in subsequent permits that connect to this line ❑ Flow has already been allocated in Pen -nit Number: ❑ Rehabilitation or replacement of existing sewer with no new flow expected ® Other (Explain): DECOMMISSIONING PUMP STATION FORM: FTA 04- l6 Page 2 of 5 VII. GRAVITY SEWER DESIGN CRITERIA (If Applicable) - 02T .0305 & MDC (Gravity Sewers): l . Summarize gravity sewer to be permitted: Size (inches)7 inches) Length (feet) Material 8" 1,997 PVC 8" 40 DIP ➢ Section II & III of the MDC for Pennitting of Gravity Sewers contains information related to design criteria ➢ Section III contains information related to minimum slopes for gravity sewer(s) ➢ Oversizing lines to meet minimum slope requirement is not allowed and a violation of the MDC VIII. PUMP STATION DESIGN CRITERIA (If Applicable) — 02T .0305 & MDC (Pump Stations/Force Mains): COMPLETE FOR EACH PUMP STATION INCLUDED IN THIS PROJECT 1. Pump station number or name: STEVENS MILL SUBDIVISION PS #1(TO BE REMOVED) 2. Approximate Coordinates (Decimal Degrees): Latitude: 35.0822.8° Longitude:-80.3707.3° 3. Design flow of the pump station: millions gallons per day (firm capacity) 4. Operational point(s) of the pump(s): gallons per minute at feet total dynamic head (TDH) 5. Summarize the force main to be permitted (for this Pump Station): Size (inches) Length (feet) Material 0 6. Power reliability in accordance with 15A NCAC 02T .0305(h)(1): ❑ Standby power source or pump with automatic activation and telemetry - 15A NCAC 02T .0305(h)(1)(B)_ ➢ Required for all pump stations with an average daily flow greater than or equal to 15,000 gallons per day ➢ Must be permanent to facility Or if the pump station has an average daily flow less than 15,000 gallons per day: ❑ Portable power source with manual activation, quick -connection receptacle and telemetry - 15A NCAC 02T .0305(h)(1)(C) or ❑ Portable pumping unit with plugged emergency pump connection and telemetry - 15A NCAC 02T .0305(h)(1)(C): ➢ It shall be demonstrated to the Division that the portable source is owned or contracted by the applicant (draft agreement) and is compatible with the station. ➢ If the portable power source or pump is dedicated to multiple pump stations, an evaluation of all the pump stations' storage capacities and the rotation schedule of the portable power source or pump, including travel timeframes, shall be provided in the case of a multiple station power outage. FORM: FTA 04-16 Page 3 of 5 IX. SETBACKS & SEPARATIONS - (02B .0200 & 15A NCAC 02T .0305(f)): [-]No Does the project comply with all separations found in 15A NCAC 021.0305(fl & (g) ® Yes ➢ 15A NCAC 02T.0305 contains minimum separations that shall be_provided for sewer s Setback Parameter* Se aration Re uired Storm sewers and other utilities not listed below vertical 24 inches Water mains vertical -water over sewer includingin benched trenches 18 inches 10 feet Water mains horizontal 18 inches Reclaimed water lines vertical - reclaimed over sewer 2 feet Reclaimed water lines horizontal - reclaimed over sewer **Any private or public water supply source, including any wells, WS-I waters of Class I or 100 feet Class II impounded reservoirs used as a source of drinking,water **Waters classified WS (except WS-I or WS-V), B, SA, ORW, HQW, or SB from normal 50 feet high water or tide elevation and wetlands see item IX.2 **Any other stream, lake, impoundment, or ground water lowering and surface drainage 10 feet ditches 5 feet Any building foundation 10 feet Any basement Top slope of embankment or cuts of 2 feet or more vertical height 10 feet 5 feet Drainage systems and interceptor drains 10 feet Any swimming pools 36 inches Final earth grade vertical where separations in 02T.0305 cannot be achieved. ➢ 15A NCAC 02T.0305(g) contains alternatives be identified using the Division's NC Surface Water Classifications webpage ➢ **Stream classifications can ➢ If noncompliance with 02T 0305(fl or (g). see Section X of this application 2. Does the project comply with separation requirements for wetlands? (50 feet of separation) ® Yes ❑ No ❑ N/A ➢ See the Division's draft separation requirements for situations where separation cannot be meet ➢ No variance is required if the alternative design criteria specified is utilized in design and construction ➢ As built documents should reference the location of areas effected 3. Does the project comply with setbacks found in the river basin rules per 15A NCAC 02B .0200? ® Yes ❑ No ❑ N/A ➢ This would include Trout Buffered Streams per 15A NCAC 213.0202 4. Does the project require coverage/authorization under a 404 Nationwide or ® Yes $No individual permits or 401 Water Quality Certifications? ➢ Information can be obtained from the 401 & Buffer Permitting Branch 5. Does project comply with 15A NCAC 02T.0105(c)(6) (additional permits/certifications)? ®. Yes ❑ No Per 15A NCAC 02T 0105(c)(6), directly related environmental permits or certification applications are being prepared, have been applied for, or have been obtained. Issuance of this permit is contingent on issuance of dependent permits (erosion and sedimentation control plans, stormwater management plans, etc.). 6. Does this project include any sewer collection lines that are deemed "high -priority?" Per 15A NCAC 02T.0402, "high -priority sewer" means "any aerial sewer, sewer contacting surface waters, siphon, or sewer positioned parallel to streambanks that is subject to erosion that undermines or deteriorates the sewer. ❑ Yes ®No ❑ N/A ➢ If yes, include an attachment with details for each line, including type (aerial line, size, material, and location). High priority lines shall be inspected by the permittee or its representative at least once every six -months and inspections documented per 15A NCAC 02T.0403(a)(5) or the permitee's individual System -Wide Collection permit. Page 4 of 5 FORM: FTA 04-16 X. CERTIFICATIONS: 1. Does the submitted system comply with 15A NCAC 02T, the Minimum Design Criteria for the Permitting of Pump Stations and Force Mains (latest version), and the Gravity Sewer Minimum Design Criteria (latest version) as applicable? ® Yes ❑ No If No, complete and submit the Variance/Alternative Design Request application (VADC 10-14) and supporting documents for review. Approval of the request is required prior to submittal of the Fast Track Application and supporting documents. 2. Professional gineer's Certification: e e� attest that this application for I, (Professional Engineer's name from Application Item III.1.) has been reviewed by me and is accurate, complete and consistent with the information supplied in the plans, specifications, engineering calculations, and all other supporting documentation to the best of my knowledge. I further attest that to the best of my knowledge the proposed design has been prepared in accordance with the applicable regulations, Gravity Sewer Minimum Design Criteria for Gravity Sewers (latest version), and the Minimum Design Criteria for the Fast -Track Permitting of Pump Stations and Force Mains (latest version). Although other professionals may have developed certain portions of this submittal package, inclusion of these materials under my signature and seal signifies that I have reviewed this material and have judged it to be consistent with the proposed design. NOTE — In accordance with General Statutes 143-215.6A and 143-215.613, any person who knowingly makes any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor, which may include a fine not to exceed $10,000, as well as civil penalties up to $25,000 per violation. . North Carolina Professional Engineer's seal, signature, and date: �,�``� CA .Q tN' ..p.� OA���S�%'9: 17637 3. Applicant's Certification per 15A NCAC 02T .0106(b): O FAN I� �� N(l1 v�W'Pr91eNT i�tzo�I�M ` IC attest that this application for (Signature Authority s name & title from Application Item 1.3.) has been reviewed by me and is accurate and complete to the best of my knowledge. I understand that if all required parts of this application are not completed and that if all required supporting documentation and attachments are not included, this application package is subject to being returned as incomplete. I understand that any discharge of wastewater from this non - discharge system to surface waters or the land will result in an immediate enforcement action that may include civil penalties, injunctive relief, and/or criminal prosecution. I will make no claim against the Division of Water Resources should a condition of this permit be violated. I also understand that if all required parts of this application package are not completed and that if all required supporting information and attachments are not included, this application package will be returned to me as incomplete. NOTE — In accordance with General Statutes 143-215.6A and 143-215.6B, any person who knowingly makes any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor, which may include a fine not to exceed $10,000 as well as civil penalties up to $25,000 per violation. Date: 2,0 Signature: 5 /G 7 Zd Page 5 of 5 FORM: FTA 04-16 Tuvia, Ori A From: Vince Keene <vincek@y-wh.com> Sent: Wednesday, June 24, 2020 9:24 AM To: Tuvia, Ori A Cc: Todd Godfrey Subject: [External] RE: WQ00086S9 MOD, Stevens Mill Sorry Oril Approximately 960 feet of Forcemain will be decommissioned. Vincent G. Keene, P.E. President Yarbrough -Williams & Houle, Inc. 730 Windsor Oak Court (28273) Charlotte, North Carolina Mail to: P.O. Box 1198 Pineville, NC (28134) Mob (704) 685-0071 Phone (704)556-1990 Fax (704)556-0505 From: Tuvia, Ori A <ori.tuvia@ncdenr.gov> Sent: Tuesday, June 23, 2020 1:48 PM To: Vince Keene <vincek@y-wh.com> Subject: WQ0008659 MOD, Stevens Mill Good Afternoon Vinvent, I am following up on our phone conversation couple of weeks ago, I was asking for additional information about how many feet of line will be decommissioned and have not heard back. Sincerely, Ori -, 7--) i;� 7MINT HILL, NC MIDLAND NC,,' A r � 2019 �� 2019 , ` tj '� ff � 'r � `�..1 �,J 'yI1 ti '�••�,,�.,_,� 111 yi CD 1I � i.�l �y.. �5 ; I, '} I. � � /J4 �} s ��„�r+^—•��,�1����t_ - - . r'•P � r f1 ti 'w..-.,mow; r �� 1 �"'' 1 '+r` ,,,,•! -,v-,i r` f-i1, 1 000, 1 of do L&�—j lzl-� 4/ r=1000, l VICINITY MAP Je M CO 0 Oteek I 4 McDonald's "�7110wbrOok Dr Harris Teeter 10 011 "Otis, to rl 524 Y Premier Renovations, Inc SITE Emerald Lake Golf C 104 Jar 1"=10001 1. State of North Carolina DWR Department of Environmental Quality Division of Water Resources Division °t Water Resources Flow Tracking for Sewer Extension Applications (FTSE 10-18) Entity Requesting Allocation: Union County Project Name for which flow is being requested: Stevens Mill Sewer & Pump Stations More than one FTSE may be required for a single project if the owner of the WWTP is not responsible for all pump stations along the route of the proposed wastewater flow. Complete this section only if you are the owner of the wastewater treatment plant. D/NGt71iNR/DWR a. WWTP Facility Name: Twelve Mile Creek WWTP b• WWTP Facility Permit #: NC0085359 JUN gyp; WQROS c. WWTP facility's permitted flow All flows are in J IILE REGIONAL OFFICE 7.5* Does not include 3 d. Estimated obligated flow not yet tributary to the WWTP 1 9840diversion to 6 Mile e. WWTP facility's actual avg. flow f. Total flow for this specific request 4.18 0. g. Total actual and obligated flows to the facility0 h. Percent of permitted flow used 6.164640 82.19 II. Complete this section for each pump station you are responsible for along the route of this proposed wastewater flow. List pump stations located between the project connection point and the WWTP: A Design (B) (C) (D)=(B+C) (E)=(A-D) Pump Pump Obligated, Station Station Average Approx. Not Yet Total Current (Name or Permit Capacity, Daily Flow** Current Tributary Flow Plus Avg. Daily Daily Flow, Obligated Available Number) No. MGD MGD Flow, MGD MGD Flow *** PoplinRd WQ019570 4.0092 Capacity 1.6037 0.9940 0.3790 1.3730 Hunley WQ022234 1.1920 0.2307 0.4768 0.4484 0.1079 0.5563 StevensM WQ008659 0.1377 -0.0795 0.0551 0.0170 0.000.0170 0.0381 * The Firm Capacity (design flow) of an y ump station is that can be achieved with the largest pump taken out of service. as the in pumped flow ** Design Average Daily Flow is the firm capacity of the pump station divided by a peaking factor (pf) not less than 2.5, per Section 2.02(A)(4)(c) of the Minimum Design Criteria. *** A Planning Assessment Addendum shall be attached for each pump station located between the project connection point and the WWTP where the Available Capacity is < 0. Downstream Facility Name (Sewer) Downstream Permit Number: Twelve Mile Creek WWTP WQ0040462 Page I of 6 FTSE 10-18 III. Certification Statement: I Crystal O. Panico, PE certify to the best of my knowledge that the addition of the volume of wastewater to be permitted in this project has been evaluated along the route to the receiving wastewater treatment facility and that the flow from this project is not anticipated to cause any capacity related sanitary sewer overflows or overburden any downstream pump station en route to the receiving treatment plant under normal circumstances, given the implementation of the planned improvements identified in the planning assessment where applicable. This analysis has been performed in accordance with local established policies and procedures using the best available data. This certification applies to those items listed above in Sections I and II plus all attached planning assessment addendurns for which I am the responsible party. Signature of this form certifies that the receiving collection system or treatment works has adequate capacity to transport and treat the proposed new wastewater. Signature New Development Program Manager Title of SignIng Official Date M Page 2 of 6 FTSE 10-18 SO[JTHSTONE PROJECT copy Hanley Creek Sewage Pump Station Upgrade Options Preliminary Design Report Union County, North Carolina T.AC-17000 DATE: APRIL 6, 2018 KENNETH P. KEEL, PE SR. PROJECT MANAGER, WATE ASTEWATER SEAL 21579 '., NTH P • � `1 "B �� 2905 MERIDIAN PARKWAY DURHAM, {NORTH CAROLINA 27713 NC Lzc. # C-0293 1.0 PROJECT DESCRIPTION The Southstone project in Union County is proposed to send its wastewater from 166 lots to the Hurley Creek Sewage Pump Station. The pump station currently has available capacity for approximately 32 lots at 285 gpd per lot. Capacity for an additional 134 lots is needed. The purpose of this preliminary design report is to outline the upgrades that will be necessary to increase pump station flow to serve the Southstone development. 2.0 ASSUMPTIONS AND DESIGN BASIS I made the conservative assumption that the 285 gpd per lot capacity was an average day need. At a peaking factor of 2.5, a peak flow rate of 713 gpd per lot is needed, which is equivalent to 66 gpm of additional pump output. Additional information on the status of the existing pumps was provided by Union County Public Works Department on March 21, 2018, which completely changed the upgrade alternatives for the Hurley Creek Pump Station. In addition, when trying to reconcile the new information to the Previous calculations, an elevation reading error was discovered which changed the design and installed facilities. Parameters. This discovery made the calculations line up precisely to actual field measurements Using the current output of the weakest of the two pumps of 770 gpm (January 2018 pump down tests, on which station capacity is based), the upgraded pumps must handle at least 836 gpm, However, to make a conservative evaluation, using the strongest current pump output of 809 m gp as current capacity would require the upgraded pumps to produce a minimum of 875 gpm. 875 gpm is used for this preliminary design, to ensure that sufficient capacity is provided. Based on the information provided, the existing pumps were upgraded in 2015 with 12-inch impellers, which is the maximum size that the Fairbanks 4" 5433MV pumps can utilize. The existing 12-inch ductile iron force main is operating at a C factor of between 110 and 120. The pump station wet well was confirmed to be 10 feet in diameter, which gives the existing installation a minimum cycle time (theta) of 14 minutes. The available design depth (pump -off to lead -pump -on) is 5 feet. The current operational design depth could be less, depending on the actual settings in the wet well which were not confirmed. Reducing the design depth would result in a reduction of theta, which simply increases the pump cycle times. 3.0 RECOMMENDED UPGRADE Replacing the existing 4" 5433MV (12" impeller) pumps with 4" 5434MV (12.72" trimmed impeller) pumps will produce approximately 875 gpm, This proposed upgrade will provide Southstone with the additional flow needed. Unfortunately, the dimensions for the selected larger pumps do not match the existing pumps. Therefore, it appears likely that the interior piping and guiderails in the existing wet well will have to be adjusted or replaced for the new pumps to fit properly, Preliminary Design Report The John R. McAdams Company, Inc, Hunley Creek Sewage Pump Station Upgrade Options Southstone Project 4/6/2018 The electrical components will likewise have to be retrofitted. Many of the components may be usable, but the power feed wiring, starters, and circuit breakers will need to be replaced. The existing generator appears to be slightly oversized for the current pumps, so it is possible that it . An electrical engineer will could handle the additional load of increased horsepower puanps need to fully evaluate the existing components and the proposed upgrades tdetermine the extent of the upgrades required. The existing force main is sized to handle additional capacity. At the proposed flow of 875 gpm, the velocity in the pipe is only 3 £t/sec, which is well within an acceptable range. Keeping the pump design depth at 5 feet, pumps producing 875 gpm will have a station theta value of 13 minutes (4.6 cycles per hour). If we reduce the design depth to 4 feet, at 875 gpm theta would be 10.75 minutes (5.6 cycles per hour). NCDEQ requires between 2 and 8 cycles per hour, 4.0 OTHER. CONSIDERATIONS If Union County has a policy in place to share the cost of an upgrade with a developer when extra capacity is included, this upgrade would be an ideal candidate. Since the actual additional capacity needed for Southstone is relatively small, yet will be expensive to implement, it makes sense to design the new pumps with somewhat more capacity than Southstone needs. The cost difference for an additional 66 gprn (875 gpm total) vs. an additional 191 m (1,000 for example, is likely small relative to the total cost of complete pump replacement. This might be a reasonable consideration if both sides are amenable to partnering on the project. LIST OF ATTACHMENTS Calculations Spreadsheet — Existing Conditions & Proposed Upgrade System Head Curve — Existing Conditions & Proposed Upgrade Calculations Spreadsheet — Proposed Upgrade Only System Head Curve — Upgrade to 875 gpm Preliminary Design Report The John R. McAdams Company, Inc, Hunley Creels Sewage Pump Station Upgrade Options Southstone Project 4/6/2018 HUNLEY CREEK SEWAGEPUMP STA T/ON - EXISTING CONDITIONS AND PROPOSED UPGRADE UNION COUNTY PROJECT: HUNLEY CREEK SEWAGE PUMP STATION EVALUATION - UPGRADE-,4/6/18 FINAL DESIGNED BY: KPK CHECKED BY: REVISED: 4/8/2018 FLOW ANALYSIS: UNITS FLOW/UNIT FLOW FLOW-AVE FLOW -MAX (gpd) (gpm) FLOW -MIN 1557 285 443,745 308 WPM) (gpm) 770 134 Additional lots at 285 gpd for Southstone. Current peak capacity of 1,11088 MGD fully obligated (including 32 lots 03 at Southstone). ASSUMING that 285 gpd is average flow, with a peak flow needed of 713 gpd per lot, need 66 gpm additional pump station flow, which is 836 gpm minimum (875 qpm using stronger pump output), DESIGN FLOW; FLOW -MAX FLOW -DES PIPE DIA AREA sf VELOCITY fps (gpm) (gpm) 770 770 12.00 0.79 2.18 which is still more than the current design (in} PI*((D/12)^2)/4 Q/N7.48/60 Calculated flow based on current max output of weakest pump. Current design flow showed as output of weak pump, capacity of 736 gpm @ 132 ft(info provided 3/21/18, upgrade to max impeller). COMMENT: MINIMUM VELOCITY IS 2.0 FEET/SECOND. PEAK FLOW FACTOR OF 2.5 IS USED. MININUM PUMP CYCLE TIMES: FLOW -DES THETA VOLUME(gal) MAX REFILL (gpm) (min) V=O*Q/4 PUMP OUT MAX CYCLE TM 770 14.0 V/Qmin WQdes Qmin+Ades 2695 26 3.5 COMMENT: 30 TWO IDENTICAL PUMPS WILL ALTERNATE. CYCLE TIME (THETA) FOR ANY PUMP IS TWICE THETA. MINIMUM CYCLE TIME TYP 7.5-15. NCDWQ REQUIRES 2-8 CYCLES/HR (7.5-30). WETWELL SIZE: DIAMETER VOL/FT REQ VOLUME MIN DEPTH DES DEPTH (ft) (gal/ft) (gal) OFF -LEAD ALARM DPTH 10.0 587 2695 OFF LEAD LEAD -ALARM adjusted to 10 ft diameter, info provided on 2/9/18 4'59 5.00 1.00 MAX PUMP CYCLE TIMES: VOL-DES MAX REFILL PUMP OUT MAX CYCLE TM (gal 2937) (min) (min) (min) 28.6 4 32 COMMENT: THIS REPRESENTS MAXIMUM CYCLE TIMES AVAILABLE IN WET WELL. ACTUAL CYCLE TIME IS ADJUSTIBLE IN FIELD AS REQUIRED. M CADAMS WaterlWastewater Division Page 1 PrcJecls KPKIUnionCoPS_UPgradelHunleyCreek-PSupgrade rev040618_FfnalRev 4/6/2ol8, 1:09 PM HUNLEY CREEK SEWAGEPUMP STATION - EXISTING CONDITIONSAND PROPOSED UPGRADE UNION COUNTY HYDRAULIC ANALYSIS: ASSUMPTIONS: WET WELL max WET WELL min (EL ft) (EL ft) (WWmax) (WWmin) 579.50 574.50 FM ELEVATIONS CORRECTED 4/6/18. CONTOUR ELEVATIONS MISREAD ON EARLIER SPREADSHEETS, DISCHARGE DISTANCE ELEVATION MAX STATIC MIN STATIC (ft) (EL ft) (ft) (ft) (L) (E) (Smax) (Smin) HIGH POINT 1 40 589.0 14,5 9.5 HIGH POINT 2 7550 681.0 106.5 101.5 HIGH POINT 3 9575 673.0 98.5 93.5 DISCHARGE MH 10650 642.0 67.5 62.5 COMMENTS: STATIC = ELEV HIGH POINT/DISCHARGE - ELEV WET WELL. REFER TO TDH COMPUTATION TO DETERMINE WHICH DISCHARGE POINT CONTROLS DESIGN, FITTING LOSSES Qd(gpm)= 770 DIAMETER FITTING COEFFICIENT NUMBER VELOCITY FITTING LOSS D(in) CODE K N V(ft/sec) NKV^2/2g(ft) &0 B(90) 0.3 3 4,9 0.3 8.0 CKV 2.5 1 4.9 0.9 8.0 GV 0.2 1 4.9 0.1 8.0 TBL 1.0 1 4.9 0.4 12.0 B(45) 0.2 2 2.2 0.0 12.0 B(90) 0.3 2 2.2 0.0 12.0 EXI 1.0 1 2.2 0.1 TOTAL 1.9 LINE LOSSES Qd(gpm)= 770 LENGTH Hf(ft) Hf(ft) TDH(ft) TDH(ft) LOCATION (ft) C=100 C=120 MAX STATIC MIN STATIC MAX STATIC 40 0 0 16 11 HIGH POINT 1 7650 19 14 127 117 HIGH POINT 2 9575 24 17 125 113 HIGH POINT 3 10650 27 19 96 84 DISCHARGE MH COMMENT: PUMPING TO HIGH POINT 2 IS THE CONTROLLING CONDITION SINCE IT IS THE MAX TDH CONDITION FOR MAX STATIC. McADAMS ' Profecte KPK1UnlonCoP6 Upgrada HunleyCreek-PSupgrade_reV04061UinalRev Water/Wastewater Division Page 2 4/6/2018, 1:09 PM HUNLEY CREEK SEWAGE PUMP STA TION -EXISTING CONDITIONS AND PROPOSED UPGRADE UNION COUNTY Based on info provided 3121118, the existing 5433MV pumps have 12 inch impellers, which are the maximum available. SYSTEM HEAD vs. FLOW - MAX STATIC & C=100 Existing 5433MV, 40 HP 12 inch impeller FLOW LINE FITTING STATIC TDH PUMP HEAD (9pm) (ft) (ft) (ft) (ft) (ft) 770 27 1.9 107 135 0 0 0.0 107 107 172.0 400 8 0.5 107 115 147.0 600 17 1.1 107 125 138.0 800 29 2.0 107 137 129.0 875 34 2.4 107 143 125.0 1000 44 3.2 107 153 118.0 1200 61 4.6 107 172 103.0 1400 81 6.2 107 194 86.0 SYSTEM HEAD vs, FLOW - MAX STATIC & C=120 Based on current pump output, it appear that the current force main condition is btwn C=110 & C=120 FLOW LINE FITTING STATIC TDH PUMP HEAD (gpm) (ft) (ft) (ft) (ft) (ft) 770 19 1.9 107 128 0 0 0.0 107 107 172 400 6 0.6 107 113 147 600 12 1.1 107 120 138 800 21 2.0 107 129 129 875 24 2.4 107 133 125 1000 31 3.2 107 141 118 1200 44 4.6 107 155 103 1400 58 6.2 107 171 86 SYSTEM HEAD vs, FLOW - MIN STATIC & C=120 Based on current pump output, it appear that the current force main condition is btwn C=110 & C=120 FLOW LINE FITTING STATIC TDH PUMP HEAD (9pm) (ft) A (ft) (ft) (ft) 770 19 1.9 102 123 0 0 0.0 102 102 172 400 6 0.5 102 108 147 600 12 1.1 102 115 138 800 21 2.0 102 124 129 875 .24 2.4 102 128 125 1000 31 3.2 102 136 118 1200 44 4.6 102 150 103 1400 58 6.2 102 166 86 MCADAMS Projects.CPMUnionCoPS_Upgrade\Hun(eyCreek•PSupgrade1ev040616 FlnalRev WaterlWastewater Division Page 3 416l2018, 1:09 PM UNION COUNTY - HUNLEY CREEK SEWAGE PUMP STATION - EXISTING CONDITIONS & PROPOSED UPGRADF onn DESIGN SYSTEM HFAn Of I❑vc 11 1f 17 •16 15( F- w 14C LL z Q 13a W r 120 110 100 90 80 tuuu 1100 1200 1300 1400 -- ��� FLOW IN GPM ---MAX STATIC C=100 0 m'N STATIC C=120 -- MAX STATIC C=120 - PROPOSED UPGRADE, 12,72-IN IMP 5434MV SEX. PUMP 12-IN IMPELLER-5433MV Fairbanks Submersible pump Page 1 Existing: 4" 5433 MV, 4D hp, 12.00" Impeller, 1770 rpm Proposed; 4"5434MV, 75 hp, 12.72°Impeller, 1780 rpm °1Prcte�te�B neeringlHunleyCroek-PSuppretle re 9g08fe pinalRev 41=018, f:30 PM PROPOSED HUNLEY CREEK SEWAGEPUMP STAT/ON UPGRADE UNION COUNTY PROJECT: HUNLEY CREEK SEWAGE PUMP STATION EVALUATION-UPGRADE-875 GPM Design DESIGNED BY: KPK CHECKED BY: REVISED: 4/6/2018 FLOW ANALYSIS: UNITS FLOW/UNIT FLOW FLOW-AVE FLOW -MAX FLOW -MIN 1768 285 (9pd) 603,880 350 (gpm) (gp (gpm) 5 11 1567 currrent units plus an additional 134 lots for Southstone is a 1691 total units need, need. This pump upgrade to 875 gpm provides a peak flow equivalent to 1.205 MGD peak? of 1.26 MGD, equivalent to 1768 units (additional 211 units). DESIGN FLOW: FLOW -MAX FLOW -DES (gpm) PIPE DIA AREA sf VELOCITY fps (gpm) 875 875 (in) PI*((D/12)"2)/4 Q/AI7.48/60 12.00 0.79 2.48 COMMENT: MINIMUM VELOCITY IS 2.0 FEET/SECOND. PEAK. FLOW FACTOR OF 2.5 IS USED. MININUM PUMP CYCLE TIMES: FLOW -DES THETA VOLUME(gal) MAX REFILL PUMP OUT (gpm) (min) V=O*Q/4 MAX CYCLE TM V/Qmin 875 13.0 2844 24 WQdes Qmin+Ades 3.3 28 COMMENT: TWO IDENTICAL PUMPS WILL ALTERNATE. CYCLE TIME (THETA) FOR ANY PUMP IS TWICE THETA. MINIMUM CYCLE TIME TYP 7.5-15, NCDWQ REQUIRES 2-8 CYCLES/HR (7.5-30). WETWELL SIZE: DIAMETER (ft) 10.0 MAX PUMP CYCLE TIMES: VOUFT REQ VOLUME (gal/ft) (gal) 587 2844 VOL-DES MAX REFILL (gal) (min) 2937 26.2 MIN DEPTH DES DEPTH ALARM DPTH OFF -LEAD OFF -LEAD LEAD -ALARM 4.84 5.00 1.00 PUMP OUT MAX CYCLE TM (min) (min) 3 29 COMMENT: THIS REPRESENTS MAXIMUM CYCLE TIMES AVAILABLE IN WET WELL. ACTUAL CYCLE TIME IS ADJUSTIBLE IN FIELD AS REQUIRED, MCADAMS Water/Wastewater Division Pr ojecls Page 1 _KPKIU"onCOPS_Upgra dekHunleyCre ek-PSupgra d e_rev040618_Final Rev_875gpm 4/612018, 12;58 PM PROPOSED HUNLEY CREEK SEWAGE PUMP STATION UPGRADE UNION COUNTY HYDRAULIC ANALYSIS: ASSUMPTIONS: WET WELL max WET WELL rein (EL ft) (EL ft) (WWmax) (WWmin) 579.50 574.60 DISCHARGE DISTANCE ELEVATION MAX STATIC MIN STATIC (ft) (EL ft) (ft) (ft) (L) (E) (Smax) (Smin) HIGH POINT 1 40 589.0 14.5 9.5 HIGH POINT 2 7550 681.0 106.5 101.5 HIGH POINT 3 9575 673.0 98.5 93.5 DISCHARGE MH 10650 642.0 67.5 62.5 COMMENTS: STATIC = ELEV HIGH POINT/DISCHARGE - ELEV WET WELL. REFER TO TDH COMPUTATION TO DETERMINE WHICH DISCHARGE POINT CONTROLS DESIGN. FITTING LOSSES Qd(gpm)= 875 DIAMETER FITTING COEFFICIENT NUMBER VELOCITY D(in) CODE K N V(fUsec) 8.0 B(90) 0.3 3 5,6 8.0 CKV 2.5 1 5.6 8.0 GV 0.2 1 5.6 8.0 TBL 1.0 1 5.6 12.0 B(45) 0.2 2 2.5 12.0 B(90) 0.3 2 2.5 12.0 EXT 1.0 1 2.5 TOTAL LINE LOSSES Qd(gpm)= 875 LENGTH Hf(ft) Hf(ft) TDH(ft) TDH(ft) (ft) C=100 C=120 MAX STATIC MIN STATIC 40 0 0 17 12 7550 24 17 133 121 9575 31 22 132 118 10650 34 24 104 89 COMMENT: PUMPING TO HIGH POINT 2 IS THE CONTROLLING CONDITION SINCE IT IS THE MAX TDH CONDITION FOR MAX STATIC, FITTING LOSS NKV^2/2g(ft) 0.4 1.2 0.1 0.5 0.0 0.1 0.1 2.4 LOCATION MAX STATIC HIGH POINT 1 HIGH POINT 2 HIGH POINT 3 DISCHARGE MH McADAMS Prdects_KPKIUnionCoPS UpgradelHunleyCmek-PSupgrade_rev040618_FinalRev_875gpm Water[Wastewater Division Page 402018, 12:58 PM PROPOSED HUNLEYOREEK SEWAGE PUMP STATION UPGRADE UNION COUNTY SYSTEM HEAD vs. FLOW - MAX STATIC & C=100 5434MV, 75 HP FLOW LINE FITTING STATIC TDH 12.72 in impeller PUMP HEAD (9pm) (ft) (ft) (ft) (ft) (ft) 875 34 2.4 107 143 0 0 0.0 400 8 0.5 107 107 187.0 600 17 1.1 107 107 115 125 166.0 156.0 800 29 2.0 107 137 146.0 875 34 2.4 1000 44 107 143 143.0 3.2 1200 61 4.6 107 107 153 172 136.0 1400 81 6.2 107 194 125.0 111.0 SYSTEM HEAD vs. FLOW - MAX STATIC & C=120 Based on current pump output, it appears that the current force main condition is btwn C=110 & C=120 FLOW LINE FITTING (9pm) STATIC TDH PUMP HEAD (ft) (ft) (ft) A (ft) 875 24 2.4 107 133 0 0 0.0 400 6 0.5 107 107 187 600 12 1.1 107 107 113 120 166 800 21 2.0 107 129 156 146 875 24 2.4 107 133 143 1000 31 3.2 107 141 136 1200 44 4.6 107 155 125 1400 58 6.2 107 171 111 SYSTEM HEAD vs. FLOW - MIN STATIC & C=120 Based on current pump output, it appears that the current force main condition is btwn C=110 & C=120 FLOW LINE FITTING (9pm) STATIC TDH PUMP HEAD (ft) (ft) (ft) (ft) (ft) 875 24 2.4 102 128 0 0 0.0 400 6 0.5 102 102 102 187 600 12 1.1 102 108 115 166 156 800 21 2.0 102 124 146 875 24 2.4 102 128 143 1000 31 3.2 102 136 136 1200 44 4.6 102 150 125 1400 58 6.2 102 168 111 McADAM5 WaterlWastewater Division Page elects_KPK1UnlonCoPS_UpgradelHunleyCreek-PSupgrade rev040618fInalRev_875gpm 4/6/2018, 12;58 PM UNION COUNTY - HUNLEY CREEK SEWAGE PUMP STATION - UPGRADE TO 875 GPM DESIGN SYSTEM HEAD CURVE zoo 190 180 170 160 150 w 140 LL z 130 T 120 110 100 90 80 0 100 200 300 400. 500 —e MAX STATIC C=100 —9 MIN STATIC C=120 600 700 800 900 1000 1100 1200 1300 1400 - FLOW IN GPM —1— MAX STATIC C=120 6 PROPOSED PUMP 12.72-IN IMPELLER-5434MV Fairbanks Submersible Pump r.�eroJecklangtnearinglHunleyCreek-PSuppnda revg4gBle FfnolRev_e75gpm Page 1 Proposed: 4" 5434MV, 75 hp, 12.72" Impeller, 1780 rpm 4r612018, 1:92 PM State of North Carolina Department of Environment, Health and Natural Resources Division of Environmental Management James B. Hunt, Jr., Governor Jonathan B. Howes, Secretary A. Preston Howard, Jr., P.E., Director Gregory F. Williams, President Fairview Developers 1801 Tower Industrial Drive Monroe, North Carolina 28110 Dear Mr. Williams: pr • • ;k C) December 15, 1993 R EGE I VEIWN+c t) F N R/bw R WOROS Mt No. ftM6g y L OFFICE Subject: Permit No. Fairview Developers Stevens Mill Subdivision Sewer Extension Union County In accordance with your application received November 4, 1993, we are forwarding herewith Permit No. WQ0008659, dated December 15, 1993, to Fairview Developers for the construction and operation of the subject wastewater collection extension. Please be advised of Condition No. 5 which states this permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Environmental Management accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. This permit shall be effective from the date of issuance until rescinded and shall be subject to the conditions and limitations as specified therein. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. One set of approved plans and specifications is being forwarded to you. If you need additional information concerning this matter, please contact Mr. Michael D. Allen at (919) 733-5083. Sincerely, A. Prest Howard, Jr., P.E. cc: Union County Health Department Mooresville Regional Office Robert D. Davis, Consulting Engineers P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone 919-733-5083 FAX 919-733-9919 An Equal Opportunity Affirmative Action EmNloyJr 50% recycled/ 10% post -consumer paper NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES RALEIGH WASTEWATER COLLECTION PERMIT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations 4 PERMISSION IS HEREBY GRANTED TO Fairview Developers Union County ,�� aj 4e, FOR THE construction and operation of approximately 8,576 linear feet of 8-inch gravity sewer, a 120 GPM pump station with duplex pumps, high water alarms, telemetry system and approximately 980 linear feet of fl- inch force main and a 120 GPM pump station with duplex pumps, high water alarms, telemetry system and approximately 1,660 linear feet of 4-inch force main to serve seventy-six (76) 2-bedroom homes and seventy-five (75) 3-bedroom homes in Stevens Mill Subdivision, and the discharge of 45,240 GPD of collected domestic wastewater into the Fairview Developers' existing sewerage system, pursuant to the application received November 4, 1993, and in conformity with the project plan, specifications, and other supporting data subsequently filed and approved by the Department of Environment, Health and Natural Resources and considered a pan of this permit. This permit shall be effective from the date of issuance until rescinded and shall be subject to the following specified conditions and limitations: This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 2. This permit is effective only with respect to the nature and volume of wastes described in the application and other supporting data. 3. The facilities must be properly maintained and operated at all times. 4. The sewage and wastewater collected by this system shall be treated in the Fairview Development Group Inc.'s Hunley Creek Wastewater Treatment Facility prior to being discharged into the receiving stream. 5. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Environmental Management accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. 6. Construction of the sewers, pump station(s) and force main shall be scheduled so as not to interrupt service by the existing utilities nor result in an overflow or bypass discharge of wastewater to the surface waters of the State. 7. Upon completion of construction and prior to operation of this permitted facility, a certification must be received from a professional engineer certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting materials. Mail the Certification to the Water Quality Permits and Engineering Unit, P.O. Box 29535, Raleigh, NC 27626-0535. 8. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of five years from the date of the completion of construction. 9. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to an enforcement action by the Division of Environmental Management, in accordance with North Carolina General Statute 143-215.6(a) to 143-215.6(c). 10. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have Jurisdiction. 11. The Permittee shall provide for the pump station and force main the following items: a. Pump on/off elevations located so that 2-8 pumping cycles may be achieved per hour in the pump station, b. An air relief valve located at all high points along the force main, c. A screened vent for the wet well, d. Fillets located in the wet well at the intersection of the flooring and sidewalls, e. Three feet of cover (minimum) over the force main or the use of ferrous material where three feet cannot be maintained, f. Sufficient devices which will protect the pump station from vandals, and g. Flood protection if the pump station is located below the 100-year flood elevation. 12. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement wastewater collection facilities. 13. NONCOMPLIANCE NOTIFICATION: The Permittee shall report by telephone to the Mooresville Regional Office, telephone number (704) 663-1699 as soon as possible, but in no case more than 24 hours or on the next working day following the occurrence or first knowledge of the occurrence of either of the following: a. Any process unit failure, due to known or unknown reasons, that renders the facility incapable of adequate wastewater transport, such as mechanical or electrical failures of pumps, line blockage or breakage, etc.; or b. Any failure of a pumping station or sewer line resulting in a by-pass directly to receiving waters without treatment of all or any portion of the influent to such station or facility. N Persons reporting such occurrences by telephone shall also file a written report in letter form within 15 days following first knowledge of the occurrence. This report must outline the actions taken or proposed to be taken to ensure that the problem does not recur. 14. The Operational Agreement between the Permittee and the Environmental Management Commission is incorporated herein by reference and is a condition of this Permit. Noncompliance with the terms of the Operational Agreement shall subject the Permittee to all sanctions provided by North Carolina General Statute 1143-215.6(a) to 143-215.6(c) for violation of or failure to act in accordance with the terms and conditions of this Permit. Permit issued this the 15th day of December, 1993 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION A. Presto, oward, Jr., P.E., Director / Division of Environmental Management By Authority of the Environmental Management Commission Permit Number WQ0008659 3 Permit No. WQ0008659 December 15, 1993 ENGINEER'S CERTIFICATION I, , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically, weekly, full time) the construction of the project, for the Project Name Location Permittee hereby state that, to the best of my abilities, due care and diligence was used in the observation of the construction such that the construction was observed to be built within substantial compliance and intent of this permit, the approved plans and specifications, and other supporting materials. Signature Registration No. Date a �r 4