HomeMy WebLinkAboutMP-21-02A - Supplemental - 3070 Williston Road (6)Wastewater System and Potable Water Supply Flow ReportProject: BETA Technologies, Inc.BETA BTV Campus, Master PlanCalculated By: Bernard Gagnon, P.E.Date: December 22, 2021Checked BY: Jack Myers, P.E.Date: December 23, 2021Project Location:Valley Road, South Burlington, VT 05403Purpose:Project Description:Estimated Average Daily Flow Wastewater/Water CalculationsFuture Flows:355,000 gsf Assembly Building (Building 3): 25,824 GPD (Previous Allocation Request)15,600 gsf Day Care Center (Building 12): 75 children and 16 employees at 16 gpd/(child,employee) = 91 x 16 = 1,456 gpdTotal Average Daily Flow (ADF) = 28,506 GPD Therefore, Use 29,000 GPD for allocation purposes.Note: Design Flows are from Table 8‐3 of the Wastewater Systems and Potable Water Supply Rules, Effecitve April 12, 2019BETA is proposing to redevelop approximately 37.6 acres of underutilized property, located at the southern end of the Burlington International Airport, into an environmentally sustainable state‐of‐the‐art campus that will include an assembly facility, general aviation hangar, training and cultural center, mixed office/retail building, and a childcare facility.As part of master plan application MP‐21‐02 related to the BETA BTV Campus, staff requested an estimate for wastewater and water demand for the projects proposed. These calculations are to be reviewed by South Burlington Water and Water Quality departments. 18,900 sf Commercial Building (Building 13): 18,900 gsf retail, 18,900 gsf office. Use 4 gpd/100 sf: 18,900 x 2 x 4/100 = 1,512 gpd25,000 gsf General Aviation Hangar with Training and Cultural Center (Building 11): 40 employees plus 60 visitors at 20 gpd/employee and 4 gpd/visitor = 100 x 12 = 1,040 gpdRemove 26,500 gsf Commercial Building (3060 Williston Road): Use current allocation (WW-4-0112-2) = -1,126 gpdRemove 6,000 gsf Storage Building (120 Valley Road): Use current allocation (WW-4-0112) = -60 gpdRemove 2,000 gsf Commercial Building (3062 Williston Road): Use 4 gpd/100 gsf: -2000/100 x 4 = -80 gpdRemove 2,700 gsf Car Repair Garage (3090 Williston Road): Assume 4 employees at 15 gpd = -60 gpd\\us0261‐ppfss01\workgroup\1794\active\179450350\transportation\permitting\City of South Burlington\master plan\Final ‐ BETA Manufacturing ‐ Wastewater‐Water Allocation Future Flows Calculation 12‐21‐2021.xlsxPage 1 of 1