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Home My WebLink About20221065 500 Union Longfellows Site Plan Water Sewer Engineering Report Engineering Report Water and Sanitary Sewer For 500 Union Avenue Saratoga Springs, New York PB # 22.XXX Prepared For: 500 Union Ave, LLC Saratoga Springs, NY 12866 Prepared By: The LA Group, P.C. 40 Long Alley Saratoga Springs, New York 12866 November 18, 2022 500 Union Avenue 2021075 1 PROJECT DESCRIPTION The 500 Union Avenue project is located at the restaurant and hotel commonly known as Longfellow’s, at 500 Union Avenue, Saratoga Springs. There are two existing buildings on site that are part of the project; the main restaurant building, and the hotel wing (to the west). The project is proposing demolition of the restaurant portion of the main building, but to retain an existing block of hotel rooms on the north side of this building. A new building is proposed in the original restaurant building’s place that will connect to the existing block of hotel rooms, and a bridge will be constructed over the drive between the main building and the standalone hotel wing (to the west). Separate from the construction of the new building, there are proposed renovations inside the buildings, which will alter the uses on site. Table 1 below has been included below to summarize the current and proposed uses on site. In general, there is a planned shift away from restaurant dining as a primary use and shift towards more hotel rooms for patrons. Table 1. Current and Proposed Uses at the 500 Union Avenue Project Type of Use on Site Currently Proposed Main Restaurant Building Hotel Wing Main Restaurant Building Hotel Wing Hotel Rooms (no. of rooms) 18 32 54 34 Spa (max. no. of patrons) n/a 2 n/a 4 Restaurant (no. of seats) 214 0 91 0 Banquet Hall (no. of seats) 125 0 175 0 Meeting room (no. of seats) n/a 70 n/a 64 EXISTING CONDITIONS Water Distribution – A City of Saratoga Springs 12” watermain is recorded to be on the east side of Route 9P. An 8” water line services the site. The existing building is sprinklered. Sanitary Sewer – An 8” PVC sanitary main services the property on the south side of the property. This gravity collection system is maintained in cooperation with the neighboring HOA and ultimately wastewater is conveyed to the Saratoga County Sewer District No. 1. From there the wastewater is conveyed to the treatment plant in Mechanicville. SEWER AND WATER USAGE The table below provides information on the anticipated average potable water use and wastewater flow rates for the project. Water use and wastewater flow are estimated to be equal 500 Union Avenue 2021075 2 for this study. Table 2. Average Projected Daily Flows Type of Use1 Quantity Average Daily Flow (gpd) Hotel (110 gpd/room) 88 9,680 Restaurant (35 gpd/seat) 91 3,185 Banquet Hall (10 gpd/seat) 175 1.750 Spa (10 gpd/patron) 4 40 Meeting Room (5 gpd/each) 64 320 Total 14,975 Since there is an existing restaurant and hotel on site, this project was evaluated based on the proposed change in flows from the existing conditions. The existing condition flows were also evaluated, refer to Attachment A for calculations. The existing flows were estimated to be 14,610 gpd, therefore, the project is estimated to increase flows by 365 gpd. Summary of Design Flows Average daily increase in flow for wastewater is estimated to be 0.3 gallons per minute (gpm) based on an 18-hour day. Estimated increase in peak hourly flow is 0.7 gpm (2.25 x average).2 Average daily increase in demand for water is estimated to be approximately equal to the wastewater flow or 0.3 gpm. For the purposes of input into the City of Saratoga Springs water model, we offer the following estimated increase in water demands for the project:  Average Day Demand is 0.3 gallons per minute (GPM) over the 18-hour period.  Max Day Demand is 0.6 gallons per minute (GPM) based on twice the average.  Peak Hourly Flow is 0.7 gallons per minute (GPM) based on 4.20 times the average.  Fire Flow Demand is 1,000 gallons per minute (GPM) per ISO guidelines. PROPOSED CONDITIONS Water Distribution – To service the project, the existing 8-inch water service to the site will continue to be utilized. The minimum needed fire flow (NFF) is 1,000 gallons per minute at 20 psi for a duration of two hours according to the Insurance Services Office Guide for Determination of Needed Fire Flow 500 Union Avenue 2021075 3 for residential occupancies protected by an automatic fire sprinkler system. The existing building is sprinklered and the proposed building will also be sprinklered. The building height is planned to remain unchanged and the sprinklers should continue to operate as designed. Connections and appurtenances, including tapping sleeves, mechanical joints, tees, isolation valves, thrust blocks, trenching, bedding, as well as testing and disinfection will all be specified in accordance with City of Saratoga Springs standards. Sanitary Sewer – Existing sanitary sewer services will be reused for the project. The project is proposing the replacement of existing grease trap on site. The project is proposing the use of a Schier Model GB-250 grease trap to manage fats, oil and grease on site. Sizing criteria is provided in Attachment A to this report. All sanitary sewer mains, laterals, manholes and manhole connections will be furnished, installed and tested according to Saratoga County Sewer District standards. 1. From Table B-3, NYSDEC Design Standards for Intermediate Sized Wastewater Treatment Systems, dated March 5, 2014 2. Civil Engineering Reference Manual, 15th Edition, Table 28.1 "Typical Variations in Wastewater Flows" ATTACHMENT A WATER AND SEWER DESIGN CALCULATIONS 500 Union Avenue SARATOGA SPRINGS, NEW YORK DETERMINE DAILY AVERAGE AND PEAK HOURLY FLOWS MAIN RESTAURANT BUILDING ESTIMATE MAXIMUM DAILY USAGE: HOTEL ROOMS EXISTING PROPOSED NO. OF BEDROOMS 18 EA 54 EA DESIGN FLOW =110 GPD/EA 110 GPD/EA Qa = 1,980 GPD 5,940 GPD RESTAURANT PER SEAT 214 EA 91 EA DESIGN FLOW =35 GPD/EA 35 GPD/EA Qb = 7,490 GPD 3,185 GPD BANQUET HALL PER SEAT 125 175 EA DESIGN FLOW =10 GPD/EA 10 GPD/EA Qc = 1,250 GPD 1,750 GPD Total (QT)10,720 GPD 10,875 GPD CALCULATIONS FOR SANITARY SEWAGE CAPACITY All usages calcuations based off of NYSDEC, Design Standards for Intermediate Sized Wastewater Treatment Systems, Typical Per-Unit Hydraulic Loading Rates 1 ATTACHMENT B SARATOGA HOTEL SPA SARATOGA SPRINGS, NEW YORK HOTEL WING ESTIMATE MAXIMUM DAILY USAGE: HOTEL ROOMS EXISTING PROPOSED NO. OF BEDROOMS 32 EA 34 EA DESIGN FLOW =110 GPD/EA 110 GPD/EA Qa' = 3,520 GPD 3,740 GPD SPA PER PATRON*2 4 EA DESIGN FLOW =10 GPD/EA 10 GPD/EA Qb' = 20 GPD 40 GPD *SPA DESIGN FLOW BASED ON BATHHOUSE MEETING ROOM PER SEAT (ASSEMBLY HALL) 70 EA 64 EA DESIGN FLOW =5 GPD/EA 5 GPD/EA Qc' = 350 GPD 320 GPD Total (QT')3,890 GPD 4,100 GPD CHANGE IN FLOW MAIN RESTAURANT BUILDING 155 GPD HOTEL WING 210 GPD TOTAL INCREASE IN FLOW 365 GPD MAX. DAILY FLOW, Q =365 GPD (CHANGE IN QT + QT') AVG. DAILY FLOW, Qav =0.3 GPM PEAKING FACTOR, Qp/Qav 2.25 ** PEAK HOURLY FLOW, Qp =0.7 GPM **Civil Engineering Reference Manual, 15th Edition, Table 28.1 "Typical Variations in Wastewater Flows" 2 ATTACHMENT B GREASE INTERCEPTOR CALCULATIONS Reference No. N/A Project Name: Ballpark Sizing Step 1: Flow rate to grease interceptor Fixture flow rate: (cu in / 231) = gal x 0.75 / min = min flow rate Flow rate used to size interceptor (less of fixture or pipe size) Pipe size (6 in): Pipe Size flow rate per Manning's Formula 200 GPM Step 2: Grease Production Number of Seats x 4 turns per seat x Grease Production Value x Days between pump-out = Grease output Number of seats in facility: 70 Grease production value: 0.0455 lbs per serving (Family Restaurant: High / Flatware) Days between pump-outs: 90 days 70 x 4 x 0.0455 x 90 = 1146.6 lbs of FOG SCHIER MODEL GB-250 Description: Polyethylene Grease Interceptor Dimensions: Length: 87", Width: 33", Height: 44" Flow Rates/Grease Capacities: 200 GPM / 1196.0 lbs Liquid Capacity: 275 gal Buyer beware: Ballpark Sizing is intended to provide a reasonably accurate recommendation when complete restaurant information is not available. For a more accurate sizing recommendation, complete a Pinpoint Sizing by logging into Grease Monkey.