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Home My WebLink About900 Hemlock Avenue WPCA '0*N SF4 w� 1540 SULLIVAN AVENUE • SOUTH WINDSOR, CT 06074 r�dsox.co TELEPHONE (860) 644-2511 January 25, 2018 VHB Attn. Mark Grocki, PE 100 Great Meadow Road, Suite 200 Wethersfield, CT 06109 Re: WPCA Approval—Evergreen Crossing Retirement Community P&Z Application#17-38P Dear Mr. Grocki: The South Windsor Water Pollution Control Authority, at its Special Meeting on January 9, 2018, gave approval for connection to the Town's sewerage system for proposed±183,682 sf senior independent living facility to be known as the Evergreen Crossing Retirement Community located at 900 Hemlock Avenue, South Windsor, CT, and as more specifically shown on plans entitled "Site Plans, Evergreen Crossing Retirement Community,900 Hemlock Avenue,South Windsor", prepared by VHB,Wethersfield,CT; Project No.:42263.00, dated 9/27/2017; Drawing Title "Utility Plan", Drawing No. C-04.0, Revisions Dates: 11/30/17. This approval is subject to the following conditions: 1. A copy of a 20' access easement from Hemlock Avenue to SMH 2 as depicted on the site utility plans; 2. The sewer lateral, pump station and force main will be maintained by property owner up to the point of discharge to the public sanitary sewer; 3. Generator backup for the private pump station; 4. Provide maintenance plans and contact information for pump station and oil/grease separator, 5. Wastewater pollutant levels shall conform to Town discharge limits; 6. Discharge flows shall not exceed 15,000 gpd without WPCA approval; 7. A connection charge of$3,845/buildable acre or applicable rate at time of connection; 8. A lateral charge of$1,167 or applicable rate at time of connection; 9. Technical approval of the Town of South Windsor Engineering Department; and 10. Final Authority approval and acceptance of the sanitary sewerage connection will be conditional upon the installed sewer line having been inspected by the Town staff, and upon the written verification of the Town staff that said sanitary sewer line was installed in substantial conformance with the design plans approved by the Authority, and meeting all regulations and appropriate technical specifications relating to sanitary sewer construction. This approval letter must be superimposed on the final approval plans. Very truly yours, 1 �� Richa d ries, Ch z!!�� Water P Ilution Control Authority RA: ead cc: Michael J. Gantick, Director of Public Works Jeff Doolittle, Town Engineer/Assistant Director of Public Works Michele Lipe, Director of Planning Chris Dougan, Chief Building Inspector TOWN OF SOUTH WINDSOR WATER POLLUTION CONTROL AUTHORITY APPLICATION FORM Application No.= Date Received Date Scheduled For Applicant Cameron General Contractors Address804O Eiger Drive, Lincoln, NE 68516 Telephone No.: (402)420-3149 Owner of Record on Land Records Evergreen Walk,LLC a Connecticut Limited Liability Company Owner's Address 1109 Rose Lane, Virginia Beach,VA 23451 Property Description: Assessor's Map# 27-15 Parcel# Vol. Page Project Title: Evergreen Crossing Retirement Community Inquiries to be Directed to: (Name,Address,Telephone No.) VHB-c%Mark Grocki, PE -100 Great Meadow Road,Suite 200, Wethersfield, CT 06109 Approvals Previously Received(Check) IWA X PB&Z X ZBA Purpose of Application: (Check all that apply) 1. Sewer Extension/Connection--Residential Use a. Subdivision b. Single Unit c. Other Explain d. Type of Approval: Concept Final 2. Sewer Extension/Connection--Industrial/Commercial User a. New Connection X b. Request to Increase Flow Rate c. Change in Nature of Waste Discharge d. Other Explain e. Type of Approval: Concept Final X 3. Appeal of Sewer User Charge _ a. Residential b. Industrial/Commercial 4. Sewer Assessment a. Establish Sewer Assessment b. Appeal of Sewer Assessment c. Change in Use of Property 5. Regulatory Appeal ,Explain 6. Other Explain 000;- 12/l t12017 ApplicaarlAA- e D eat 12/27/17 Owner' a Date {See Reverse Side for pplicAlon Submittal Procedures} 00 September 28, 2017 0 hbo Ref: 42263.00 Water Pollution Control Authority Town Hall 1540 Sullivan Avenue South Windsor, CT 06074 Re: Evergreen Crossing Retirement Community South Windsor, CT Preliminary Sanitary Design Flow Memorandum To Whom it May Concern, VHB is pleased to submit the design flow calculations for the sanitary sewer system for the Evergreen Crossing Retirement Community located at Hemlock Avenue and Buckland Road in South Windsor, Connecticut. The proposed development includes the construction of an approximate ±68,400 SF Senior Independent Living Facility building with three (3)floors (totaling ±183,682 SF), supplementary landscaping improvements, parking fields and garages, retaining walls, a stormwater management system, sewer pump station, and utility improvements to support the use.The building will be fitted with an emergency generator for the entire site (building &pump station) in case of an emergency. In addition, pump station will be armed with a dual alarm system in case of failure or in need of repair (see pump station detail found on 'Site Details 1'sheet C-06 of the planset dated September 26, 2017). Sanitary sewer effluent is proposed to exit the building through an 8-inch PVC pipe at a ±1% slope where it is conveyed to a sewage pump station and valve chamber located at the southern end of the proposed development. From the pump station, the effluent will be pumped though a 4-inch force main, approximately 330ft, from an invert elevation of 89.60,to an existing sanitary sewer manhole within Hemlock Avenue at an outflow elevation of 113.3, roughly a 24ft elevation difference. The sewer flows for the proposed development have been estimated based on three sources:TR-16: Guides for the Design of Wastewater Treatment Works (Source 1), Estimated sanitary flows from a similar Independent Senior Living Facility located in South Portland, ME (Source 2, attached for 100 Great Meadow Road Engineers I Scientists I Planners I Designers Wethersfield,Connecticut 06109 P 860.807.4300 \\vhb\proj\Wethersfield\42263.00\docs\VARIOUS\Utilities\Sewer\Preliminary Sanitary Design F 860.372.4570 Flow Meniorandum.doa Of Ref:42263.00 j,00 September 28, 2017 �� 0 Page 2 hb reference), and Connecticut Public Health Code (Source 3). Calculations for approximate total daily flow and estimated flow in cubic feet per second are included within the tables below: Total Estimated Flow for Senior Independent Housing Source 1: TR-16: Guides for the Design of Wastewater Treatment Works Flow Units Bedrooms (gpd/�) Total 64 1 70 4,480 62 2 70 8,680 4 3 70 840 Total 130 14,000 GPD Source 2: Flow's provided by Client for similar Senior Independent community in South Portland, Maine (see attached) Units Bedrooms Flow(gpd/ t itr Total 64 1 75 4,800 62 2 75 9,300 4 3 75 900 Total 130 15,000 1 GPD Source 3: Connecticut Public Health Code: Standards for Subsurface Sewage Disposal Systems (Hospital/Rest Home/Convalescent Home/Residential Motel-Hotel) Units Bedrooms Flow(gpd/bed) Total 64 1 150 9,600 62 2 150 18,600 4 3 150 1,800 Total 130 1 1 30,000 GDP \\vhb\proj\Wethersfield\42263.00\docs\VARIOUS\Utilities\Sewer\Preliminary Sanitary Design Flow Memorandum.docx `0# Ref:42263.00 September 28, 2017 Vhb Page 3 Peak Flo7for Senior Independent Housing Use:Assumed day of 16 hours(8 hours of sleep) Use: Peaking Factor of 5.6(TR-16 Fig 2-1 "Extreme Flow to Avg. Daily Flow") (0.1 MGD=5.6 Peaking Factor) Total Source GPD 16-Hr Day Peaking Factor Flow calculated Conversion (cfs) 1 14,000 2.343E-06 5.6 0.184 2 15,000 2.343E-06 5.6 0.197 R 3 30,000 2.343E-06 5.6 0.394 J We hope the information submitted is satisfactory and look forward to speaking further with the Water Pollution Control Authority regarding the design flow calculations. Please do not hesitate to contact me with any questions or concerns. Sincerely, Vanasse Hangen Brustlin, Inc. Mark Grocki, P.E. Senior Project Engineer mgrocki@vhb.com \\vhb\proj\Wethersfield\42263.00\dots\VARIOUS\Utilities\Sewer\Prelimi nary Sanitary Design Flow Memorandum.docx S- BAG O JOB RL Communities T E C H N II C 5 SHEET NO. 1 OF 2 75 John Roberts Road, Suite 1A CALCULATED BY RAM DATE 4/14/2015 South Portland, Maine 04106 CHECKED BY DATE (207) 200-2100 FAX(207) 856-2206 1 FOR REFERENCE ONLY Sanitary Sewer Flows Flows RL Communities look at: 1. Historical flows from other RL communities suggest a flow of 75 gal/unit. 2. Maine Subsurface Wastewater Disposal rules requires a design flow of 60 gpd/resident. 130 units x 75 gallons/day= 9750 gpd Peak Day= 1.5 x Average Daily Flow(ADF) = 14625 gpd Peak Hour=4.2 x ADF/ 1200 min/day (16 hour day) = 42.656 gpm 82 1 bedroom suites x 60 gallons/day= 4920 gpd 44 2 bedroom suites x 120 gallons/day= 5280 gpd 4 3 bedroom suites x 180 gallons/day= 720 gpd Total 10920 gpd Peak Day= 1.5 x Average Daily Flow(ADF) = 16380 gpd Peak Hour=4.2 x ADF/ 1200 min/day(16 hour day) = 47.775 gpm Historical Peak Monthly Flows obtained from Portland Water District for 2 year period (12/02-12104) Usage Days Hours Peak Hr Date (HCF) Days GPD /Day GPM Dead River(175 Running Hill Road) 5/27/03 344 34 7568 16 33.1 Dead River(82 Running Hill Road) 12/27/04 176 33 3989.3 12 23.3 Maine Crossing (200 Running Hill Road) 8/18/04 321 29 8279.6 12 48.3 Target (240 Running Hill Road) 8/18/04 140 29 3611 12 21.1 6" Force main (minimum flow gpm, 2.5 ft/s) 220.3 gpm 4" Force main (minimum flow gpm, 2.5 ft/s) 97.913 gpm Pump flow to be greater than 125 /o of minimum velocity flow 2" Force main (minimum flow gpm, 2.5 ft/s) 24.478 gpm and/or peak project flow