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Home My WebLink About20191171 Skidmore Fitness and Tennis Center Engineering Report LQ The LA GROUP L•_r escape Architecture&Engineering P.C. People.Purpose.Place. 40 Long Alley Saratoga Springs NY 12866 p 518-587-8100 518-587-0180 Engineering Report www.thelagroup corn Water and Sanitary Sewer For SKIDMORE COLLEGE FITNESS AND TENNIS FACILITY SARATOGA SPRINGS, NEW YORK Planning Board #19.xxx Prepared For: Skidmore College 815 North Broadway Saratoga Springs, NY 12866 Contact: Dan Rodecker Prepared By: The LA Group, P.C. 40 Long Alley Saratoga Springs, New York 12866 n• ' u ) r ;u 4 November 26, 2019 Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 1. Project Description The project is to construct a new two-story Fitness and Tennis Facility for athletes and students/staff, four indoor tennis courts and relocate the existing tennis courts including state-of- the-art LED lighting, and related infrastructure relocations and improvements. The project is located at the main Skidmore College campus, 815 North Broadway in Saratoga Springs, New York. More specifically, the athletic buildings are in the area bounded by Clinton Street, State Street and the City Recreation Fields. 2. Existing Water and Sanitary Sewer Utilities Domestic and fire protection water is available from the Skidmore College private site distribution network. The private system has adequate flow and pressure to serve the new facility. There is an existing 6-inch water service that feeds the Dance and Sports Center buildings. This area of the campus is served by a gravity sanitary sewer collection system. From the proposed point of connection to the existing site collection system, a 6-inch gravity line flows south toward the intersection of Clement Avenue and State Street where it flows into the City of Saratoga Springs municipal collection system. At this point in the City system, the pipes are 6-inches in diameter. This section of sewer main is between the manhole at First Street and Woodlawn Avenue (SA-19) and the manhole at First Street and North Broadway. This pipe has a measured slope of 1.83%. 3. Projected Water and Wastewater Flows To estimate average daily water use for the new Fitness and Tennis Facility, use the estimated number of users (100) at 20 gallons per day plus visitors (1,000) at 5 gallons per day for a total of 7,000 gallons per day. To estimate sanitary sewer flow contributions to the municipal collection system, peak flows are determined using drainage fixture unit counts (DFU's). Table 1 below provides information on the anticipated peak wastewater flow rates for the project: Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 TABLE 1 Description Drainage Fixture Peak Flow2 Units(DFU's)' Existing Sports Center 390 120 gpm Existing Dance Center 90 65 gpm New Fitness and Tennis Facility 600 160 gpm Total 1,080 240 gpm3 1. Drainage Fixture Units from NYS Bldg. Code Table 709.1 2. Peak flow is estimated using the modified Hunter curve. 3. Peak flow is determined from the total DFU's of the 3 buildings together. For the new Fitness and Tennis Facility, average daily flow for wastewater is estimated to be 9.7 gallons per minute (gpm) based on a 12-hour day. Estimated peak hourly flow is 41.2 gpm (4.24 x average).' To estimate water demand from the municipal system, peak demands are determined using water supply fixture unit counts (WSFU's). Table 2 below provides information on the anticipated peak water demands for the project: TABLE 2 Description Water Supply Peak Demands Fixture Units (WSFU's)4 Existing Sports Center 750 177 gpm Existing Dance Center 180 86 gpm New Fitness and Tennis Facility 500 143 gpm Total 1,430 261 gpm6 4. Water Supply Fixture Units from NYS Bldg. Code Table E103.3(2) 5. Peak demand is estimated using NYS Bldg. Code Table E103.3(3) 6. Peak demand is determined from the total WSFU's of the 3 buildings together. Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 Average daily demand for water for the new Fitness and Tennis Facility is estimated to be approximately equal to the wastewater flow or 9.7 gpm. Instantaneous peak demand for the new Fitness and Tennis Facility is estimated to be 143 gpm8. For the purposes of input into the City of Saratoga Springs water model, we offer the following estimated water demands for the project: • Average Day Demand is 9.7 gallons per minute (GPM) over the 12-hour period. • Max Day Demand is 19.4 gallon per minute (GPM)based on twice the average. • Peak Hourly Demand is 41.2 gallons per minute (GPM)based on 4.24 times the average. • Fire Flow Demand is 1,000 gallons per minute (GPM)per ISO guidelines. IV. Proposed Water and Wastewater Utilities Proposed Water Utilities Domestic and fire protection water will be brought to the new facility from the private site distribution network. The new building water service will be taken from the existing 6-inch water service feeding the athletic complex. The existing service line will be wet-tapped, and a new 6-inch service brought into the new Fitness and Tennis Facility water room. A new fire hydrant will be installed at the end of this service lateral for fire protection and flushing purposes. Connections and appurtenances, including mechanical joints, tees, isolation valves, thrust blocks, trenching, bedding, service connections, as well as testing and disinfection will all be specified in accordance with City of Saratoga Springs and AWWA standards. Proposed Wastewater Utilities The existing sewer lateral serving the Sports Center and the Dance Center will be relocated to make room for the new Fitness and Tennis Facility. The new lateral will be the same diameter and slope as the existing pipe (6-inches at 0.90%). The estimated peak flow from the Sports Center and the Dance Center is 185 gallons per minute based on drainage fixture unit counts. The flow capacity of the 6-inch pipe at a slope of 0.90%is 239 gallons per minute based on Manning's Equation. The new Fitness and Tennis Facility sanitary waste will combine with the existing flows at the existing manhole located at the southeast corner of the new building. From this manhole, the existing sanitary sewer is a 6-inch pipe at a slope of 1.20%. The estimated peak flow from the Sports Center, Dance Center and the new Tennis and Fitness Center is 240 gallons per minute based on drainage fixture unit counts. The flow capacity of the 6-inch pipe at a slope of 1.20%is 275 gallons per minute based on Manning's Equation. Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 To check the receiving section of municipal sewer main between the manhole at First Street and Woodlawn Avenue (SA-19) and the manhole at First Street and North Broadway, total peak flow was estimated by adding projected flows from the contributing residences to the flows generated from the Skidmore buildings. Looking at aerial photos and comparing with City sewer maps, it appears that 12 homes contribute flows to this section of the system. Estimating a peak flow of 5 gallons per minute per residence, the total added flow is 60 gallons per minute (GPM). Added to the Skidmore contribution of 240 GPM gives a total peak flow of 300 GPM. This pipe has a measured slope of 1.83%. The flow capacity of the 6-inch pipe at a slope of 1.83%is 340 gallons per minute based on Manning's Equation. CO S tet). SA-76 SA.+029 'SA-1028 S ah-10 1 F °N0 o' er A. ;! CLEMENT AVE p�.._ SA-762 . a,1a' '-.. 7.74 "& . 6. ? Sa S1' -- F :1SL.36 ,o 3sz.s4 87' ----- d /F Sa.549 ,40 6..7.C: sass 1 . ' SA-1026 7 'u' c•/fin/ isi Figure 1—Partial City Sewer Map The projected peak flow of 300 GPM is a conservative estimate considering it assumes that four separate venues are operating at full capacity simultaneously. According to Skidmore, holding simultaneous events in the four separate venues (dance, swimming, basketball, and tennis) Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 stresses the infrastructure of lockers, parking, staffing and other logistical issues which is why Skidmore avoids such a peak situation in scheduling events. Notes 7. From Figure 1, GLUMRB Recommended Standards for Wastewater Facilities Q=(18+P'/2) ÷(4 +P'/2) where P=population in thousands 8. From the NYS Plumbing Code,Appendix E based on Water Supply Fixture Units.