The URL can be used to link to this page

Home My WebLink About20221027 Skidmore Construction Wellness Center Engineering ReportEngineering Report Water and Sanitary Sewer For SKIDMORE COLLEGE HEALTH, WELLNESS, FITNESS & TENNIS FACILITY SARATOGA SPRINGS, NEW YORK Planning Board #22.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 November 4, 2022 The LA Group, P.C. 40 Long Alley aratoga Springs, New York 1286 November 4, 2022 Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 1. Project Description The project is to construct a new two-story Health, Wellness, 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 which accepts flow from the existing Sports and Dance Centers. 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 The daily water usage for the proposed facility is 12,322 gallons per day. This demand is based on building occupancy and was provided by the plumbing engineer. The existing Sports Center and Dance Center have a design flow based on total number of users. The design flows for the Sports Center and Dance Center are 14,500 gallons per day and 4,750 gallons per day respectively. For the new facility, average daily flow for wastewater is estimated to be 17.1 gallons per minute (gpm) based on a 12-hour day. Estimated peak hourly flow is 71.4 gpm (4.17 x average).1 Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 The existing Sports and Dance Centers have a combined average daily flow for wastewater is estimated to be 26.7 gallons per minute (gpm) based on a 12-hour day. Estimated peak hourly flow is 109.6 gpm (4.10 x average).1 For the purposes of input into the City of Saratoga Springs water model, we offer the following estimated combined water demands for the existing Sports Center, Dance Center and proposed Tennis and Fitness Center: x Average Day Demand is 43.8 gallons per minute (GPM) over the 12-hour period. x Max Day Demand is 87.6 gallon per minute (GPM) based on twice the average. x Peak Hourly Demand is 181.0 gallons per minute (GPM) based on 4.13 times the average. x 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 tapped, and a new 6-inch service brought into the new 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 facility. The new lateral will be the same diameter and slope as the existing pipe (6-inches and 0.90%). The estimated peak flow from the Sports Center and Dance Center is 109.6 gallons per minute. 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 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 Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 is a 6-inch pipe at a slope of 1.20%. The estimated peak flow from the Sports Center, Dance Center and the new facility is 181 gallons per minute. The flow capacity of the 6-inch pipe at a slope of 1.20% is 275 gallons per minute based on Manning’s Equation. 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 181 GPM gives a total peak flow of 241 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. Figure 1 – Partial City Sewer Map Engineering Report Skidmore Fitness and Tennis Saratoga Springs, New York 2016098.01 The projected peak flow of 241 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) stresses the infrastructure of lockers, parking, staffing and other logistical issues which is why Skidmore avoids such a peak situation in scheduling events. Notes 1. From Figure 1, GLUMRB Recommended Standards for Wastewater Facilities Q = (18 + P ½) ÷ (4 + P ½) where P = population in thousands