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Home My WebLink About20260171 110-114 Nelson Ave Site Plan Engineering Report Water and Sanitary Sewer Engineering Report Water and Sanitary Sewer For JW Hemmingway PUD NELSON AVENUE SARATOGA SPRINGS, NEW YORK Prepared For JW Hemmingway LLC 563 North Broadway Saratoga Springs, NY 12866 Contact: John Witt Prepared By The LA Group, P.C. 40 Long Alley Saratoga Springs, New York 12866 February 25, 2026 Engineering Report JW Hemmingway PUD 2021001 1 I. Introduction The proposed project involves the development of eight (8) single family residential homes and one (1) multifamily building located within the JW Hemmingway PUD at Nelson Avenue. The total bedroom count for the project is 48 bedrooms. The property is currently undeveloped. Municipal water exists within Frank Sullivan Place and Nelson Avenue. Municipal sewer exists in Nelson Avenue. Water will be supplied for domestic and fire protection through a new 6-inch branch lateral which will connect to the 6-inch main on Frank Sullivan Drive. This existing 6-inch main is owned by the City of Saratoga Springs. For sanitary sewer collection, new laterals will connect to the existing 8” sewer main in Nelson Avenue, owned by the City of Saratoga Springs. II. Project Description The JW Hemmingway PUD project proposes the construction of eight (8) single family residential homes and one (1) multifamily building. The total bedroom count is 48. III. Existing Water and Sanitary Sewer Utilities Municipal water service is currently provided by the City of Saratoga Springs. A 6” diameter water main located in Frank Sullivan Place and a 12” diameter water main in Nelson Avenue. The city of Saratoga Springs provided flow data for the 6” water main on Nelson Ave and Wright Street. The existing main has a static pressure of 73 pounds per square inch (psi). During the flow test, hydrants running at approximately 1,260 gallons per minute caused the residual pressure to drop to approximately 60 psi giving a theoretical available flow of approximately 2,691 gallons per minute at 20 pounds per square inch (psi). Additional flow tests will be completed prior to construction to confirm the existing pressure of the 6” municipal water main. Municipal sanitary sewer service is available from the City of Saratoga Springs via a 8” sewer line within Nelson Ave. Wastewater along Nelson Avenue is conveyed by gravity to the north and ultimately discharges to the Saratoga County Sewer District #1 wastewater treatment plant. Engineering Report JW Hemmingway PUD 2021001 2 IV. Projected Water and Wastewater Flows The tables below provide information on the anticipated wastewater flow rates for the project: Table 1 Description Use Rate Total Use (48) bedroom 110 gpd/unit1 5,280 gpd Total 5,280 gpd For the entire project, average daily flow for wastewater is estimated to be 4.9 gallons per minute (gpm) based on an 18-hour day. Estimated peak hourly flow is 20.9 gpm (4.27 x average).2 Average daily demand for water is estimated to be approximately equal to the wastewater flow or 4.9 gpm. The Total Instantaneous demand for the project is 225.0 gpm. Summary of Design Flows Water Consumption: Project ADF = 5,280 gal/day (gpd) Instantaneous Water Use = 225.0 gal/min (gpm) Sanitary Sewer Flows: Project ADF = 5,280 gal/day (gpd) Peak Hourly Flow (PHF) = 20.9 gal/min (gpm) For the purpose of input into the City of Saratoga Springs water model, we offer the following estimated water demands for the project: V. Proposed Water and Wastewater Utilities Proposed Water Utilities To service the project, the existing 6” ductile iron waterline on Frank Sullivan Place is proposed to be tapped and a new 8” ductile iron waterline extended north along Frank Sullivan Place. A new 6” ductile iron waterline will be extended on site with individual water service connections to the proposed structures. Building 7 is proposed to protected by automatic sprinklers. The two homes along Nelson Avenue will have individual ¾” services from the Nelson Ave water main. Engineering Report JW Hemmingway PUD 2021001 3 Needed Fire Flow (NFF) calculations using the ISO Guide for Determination of Needed Fire Flow are presented in Attachment B. The calculation shows a NFF of 1,000 gallons per minute. This calculation is for a non-sprinklered building. For a building protected by an automatic fire sprinkler system, the ISO states: “The NFF for residential occupancies (such as apartment buildings, lodgings and rooming houses, board and care facilities, hotels, motels and dormitories) protected by an automatic fire sprinkler system installed in accordance with the general criteria of NFPA 13R, Standard for the Installation of Sprinkler Systems in Residential Occupancies up to and including Four·Stories in Height, is the demand at the base of the automatic sprinkler riser”. “The minimum NFF is 1,000 gpm at 20 psi for a duration of 2 hours”. Using the minimum given by ISO, the NFF for building 7 is 1,000 gpm. For 1 and 2 family dwellings not exceeding 2 stories in height, ISO uses the following needed fire flows: Using the minimum given by ISO, the NFF for all the proposed single family buildings (Building 1-6, 8 & 9) is 1,500 gpm. Hydrant flow test data indicates 2,691 gpm available at 20 psi. Based on this information, there is adequate fire protection water supply available at the site. The water services proposed for the residential buildings are ¾” diameter. Building 7 is proposed to have a 6” diameter connection to supply the automatic fire sprinklers. Each building will be metered separately. Connections and appurtenances, including tapping sleeves and valves, mechanical joints, tees, isolation valves, fire hydrants, thrust blocks, trenching, bedding, service connections, as well as testing and disinfection will all be specified in accordance with City of Saratoga Springs standards. Proposed Wastewater Utilities Engineering Report JW Hemmingway PUD 2021001 4 Sanitary wastewater will be piped from each building via 6-inch PVC C-900 laterals installed at a minimum slope of 1.0%. The building laterals flow into one 6-inch PVC C-900 line that will be connected to the existing 8” sewer main on Nelson Ave. Sewer cleanouts have been located at each building lateral, as well as multiple sanitary manholes on site, for servicing. All sanitary sewer mains, laterals, manholes and manhole connections will be furnished, installed and tested in accordance with City of Saratoga Springs standards. Notes 1. From Table 1, Appendix 75-A Wastewater Treatment Standards - Residential Onsite Systems (110 gallons per day per bedroom) 2. From Figure 1, GLUMRB Recommended Standards for Wastewater Facilities Q = (18 + P ½) ÷ (4 + P ½) where P = population in thousands 3. From Table XXI, Community Water Systems Source Book, Ameen (1.4 gpm/residence). 4. From Table B-3, NYSDEC 2014 Design Standards for Wastewater Treatment Systems. Attachments Attachment A Sanitary Sewer Design Information: • Sewer Flow Calculations ATTACHMENT A SANITARY SEWER DESIGN INFORMATION JW Hemmingway PUD SARATOGA SPRINGS, NEW YORK DETERMINE DAILY AVERAGE AND PEAK HOURLY FLOWS ESTIMATE MAXIMUM DAILY USAGE: Residential Units NO. OF BEDROOMS 48 EA DESIGN FLOW =110 GPD/EA (NYSDEC) Qa =5,280 GPD MAX. DAILY FLOW, Q =5,280 GPD (Qa + Qb) AVG. DAILY FLOW, Qav =4.9 GPM (18 HOURS ) POPULATION 80 EA (10-STATE STDS. PAGE PEAKING FACTOR, Qp/Qav 4.27 10-5, FIG. 1, BASED ON 75 GPD/PERSON) PEAK HOURLY FLOW, Qp =20.9 GPM (4.27 x AVG ) CALCULATIONS FOR SANITARY SEWAGE CAPACITY JW Hemmingway PUD 1 ATTACHMENT B