3.8 Public Infrastructure, Sanitation Services, and Utilities 3.8 Public Infrastructure, Sanitation Services, and Utilities 3.8.1 Water Supply 3.8.1.1. Existing Municipal Water System Capacity One hundred percent (100%) of the water delivered by the City of White Plains is purchased from the New York City Department of Environmental Protection (NYCDEP) through Westchester County Water District No. 1. The raw water purchased from NYCDEP is drawn from the Kensico Reservoir, which is an unfiltered surface water source. Kensico Reservoir delivers high quality water and has sufficient capacity to supply the City. The City’s three wells, which supply a total of approximately 150,000 to 200,000 gallons per day, were removed from service in 2009. The Federal EPA had previously enacted the Surface Water Treatment Rule (SWTR), which required the City to conduct a study to determine if these wells were under the influence of nearby surface water and that was found to be the case with the City’s wells. Although the water quality from these wells has been consistently high for many decades, the new regulations (stated under NYSDOH PWS 43 Technical Reference) require the City to filter this water. As the City had already begun the process of rehabilitating its reservoir filtration plant, the unit is being redesigned to also incorporate the well supply. This will enable the City to meet the latest Federal and New York State Regulations pertaining to both the City’s alternate water supplies (Reservoirs and Wells) using a single filtration plant. The City plans to resume using both the reservoirs and the wells in 2014, as they are currently out of service. The City has an emergency interconnection to the Delaware Aqueduct (Shaft 22). This connection is located in Yonkers and water is distributed to the City of White Plains via the Kensico- Bronx Pipeline. This emergency connection can supply 100% of the City’s total requirements. During 2012 the City of White Plains system did not experience any restriction of the water source. The public water supply system of the City of White Plains serves the entire city, an area of approximately 9.8 square miles. The water is distributed through approximately 160 miles of water mains to provide service to more than 10,000 metered accounts. The total water produced in year 2012 was 2,895 million gallons. The daily average of water treated and pumped into the distribution system is 7.91 million gallons per day. Through discussions with the City of White Plains Department of Public Works on September 24, 2013, it has been determined that Westchester County Water District No. 1 has capacity to provide the proposed development with water. 3.8.1.2 Existing Water Consumption A copy of the water bills are provided in Appendix D-A. During the service period between 06/28/12 and 10/11/12, an average of 11,355 gallons per day (gpd) was consumed. During the service period between 10/11/12 and 12/19/12, an average of 12,141 gpd was consumed. During the service period between 12/19/12 and 04/02/13, an average of 6,869 gpd was consumed. During the service period between 60 SOUTH BROADWAY REZONING DGEIS 3.8-1 July 2014 3.8 Public Infrastructure, Sanitation Services, and Utilities 04/02/13 and 06/26/13, an average of 5,262 gpd was consumed. Over this 363-day period, an overall average of 8,907 gallons per day was consumed. 3.8.1.3 On-site Infrastructure and Connections to Public Water Mains A map of the City of White Plains water main grid in the vicinity of the Project Site can be seen in Appendix D-C. The base map was provided by the City of White Plains Department of Public Works. This was provided by the City of White Plains Department of Public Works. 12” water mains are located within South Broadway and Maple Avenue. These mains run along the southern and western sides of the project parcel, respectively. There is also a 6” water main located within Hale Avenue running along the eastern side of the project parcel. This 6” main begins at the intersection of Hale Avenue and Maple Avenue, extending along Hale Avenue to Hiram Street. Within Hiram Street is located what is believed to be an 8” water main, as per City of White Plains Department of Public Works. The map then shows a 6” water main located within Paulding Street between Hiram Street and Westchester Avenue. Although not depicted on the map, representatives from the City of White Plains Department of Public Works believe this line was upgraded to either an 8” or 12” water main. The map also shows at least three locations of service connections to the public water mains for the existing building. One of these connections is located on South Broadway, approximately three hundred feet north of the Maple Avenue intersection. The second connection point is located on Hale Avenue, approximately one hundred fifty feet north of the Maple Avenue intersection. Each of these locations appears to contain two service connections; one for domestic water and the other for fire protection. A third service connection is located on South Broadway, on the project side of the intersection with Post Road. This is a single service connection serving either the domestic or fire protection. 60 SOUTH BROADWAY REZONING DGEIS 3.8-2 July 2014 3.8 Public Infrastructure, Sanitation Services, and Utilities 3.8.1.4 Projected Water Demand The projected domestic water demands for the various development alternatives were established using the water supply fixture unit (WSFU) count method described in the 2010 Plumbing Code of New York State. The demand of WSFU was then converted to Gallons Per Minute (GPM). Due to the As this DGEIS has been prepared for the rezoning of the Westchester Pavilion, it is being submitted without building plans which would typically be used to develop fire demand. Without the benefit of said plans, no site specific fire demand can be calculated at this time. Therefore, only domestic demand has been calculated. The table below summarizes the demand in WSFU and GPM for each development scenario. Table 3.8.1-1: Projected Domestic Demand Demand Development (WSFU) Demand (GPM) Future No Action Scenario 1,698 297 Maximum Commercial Development Scenario 3,222 435 Maximum Residential Development Scenario 8,771 1,090 Maximum Mixed-Use Development Scenario 8,342 1,000 A copy of the projected water demand for the Future No Action, Maximum Commercial Development, Maximum Residential, and Maximum Mixed-Use Development Scenarios are presented in Appendix D-B. 3.8.1.5 Existing Water Pressures and Flows The Applicant retained S&S Fire Suppression Systems to perform four hydrant flow tests in the vicinity of the project area on November 11, 2013. The hydrants were located along South Broadway (2), Maple Avenue, and Hale Avenue. Hydrant testing was witnessed by Stan Johnson of the White Plains Department of Public Works. Table 3.8.1-2: Hydrant Flow Test Results Control Hydrant Flow Hydrant Static Residual Pitot Pressure Pressure Reading Flow Location (psi) (psi) Location (psi) (gpm) 3C-23 South Broadway 91 86 3C-31 South Broadway 71 1,410 3C-31 South Broadway 91 86 3C-23 South Broadway 72 1,415 Hale Avenue 110 102 3C-33 Hale Avenue 90 1,590 3C-36 Maple Avenue 93 86 3C-31 South Broadway 70 1,405 A copy of the results and locations are presented in Appendix D-C. 60 SOUTH BROADWAY REZONING DGEIS 3.8-3 July 2014 3.8 Public Infrastructure, Sanitation Services, and Utilities 3.8.1.6 Preliminary Hydraulic Analysis The projected domestic water demand for the Maximum Residential Development Scenario is 1,090 gpm. This scenario has the largest projected water demand of all four (4) scenarios considered, namely the Future No Action, Maximum Commercial Development, Maximum Residential Development, and Maximum Mixed-Use Development. Development will most likely consist of several buildings of different heights. Due to the age of the existing municipal water system, the existing cast iron water service lines will not be reused to serve the development and will be abandoned in place. As a result, we anticipate that the proposed development will necessitate the installation of eight (8) new water service connections to the existing municipal water distribution system on South Broadway, Hale Avenue and Maple Avenue. Four water service connections will be sized to supply the anticipated domestic demands and four will be sized to supply the anticipated fire flow demands. On November 11, 2013, hydrant flow tests were conducted on South Broadway and Hale Avenue. During those tests, the static water pressures in the municipal water mains on South Broadway and Hale Avenue were observed to be between 91 psi and 110 psi respectively. The noted difference in pressure readings is merely due to the difference in ground elevation between South Broadway and Hale Avenue. Indeed, South Broadway is situated at an elevation approximately 35 to 40 feet higher than Hale Avenue. It is anticipated that each domestic water and fire service connection will consist of a 6-inch minimum diameter ductile iron pipe from the municipal water main to the proposed building. The domestic riser pipe will carry water from the base of the building to all the occupied floors including the basement and parking garage(s). Assuming a static pressure of 91 psi on South Broadway and a minimum pressure of 20 psi at the most hydraulically remote plumbing fixture in the building, it is estimated that the municipal water system could provide adequate service to a building with a maximum height of 120 feet, equivalent to a 10 to 12-story building.