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Home My WebLink About20210415 Driscoll Rd Site Plan Engineer's Report for Onsite Absorption Bed ENGINEER'S REPORT Onsite Absorption Bed FOR MIXED-USE BUII,DING Driscoll Road & Route 9 City of Saratoga Springs Saratoga County, New York Prepared for: Driscoll Road, LLC 2075 Western Avenue Guilderland, NY 12084 August 12, 2021 Revised Decembe�23, 2021 Proj ect No. 5190A Prepared by: Luigi A. Palleschi, P.E. ABD Engineers, LLP 411 Union Street Schenectady, NY 12305 (518) 377-0315 Engineer's Report Onsite Absorption Bed MIXED-USE BUILDING INTRODUCTION The proposed mixed-use building is located at the intersection of Driscoll Road and Route 9 in the City of Saratoga Springs, Saratoga County, New York The site is bordered on the east by Route 9, on the south by Driscoll Road, on the west by woods, and on the north by a greenhouse. PROJECTED WATER USES The total projected average daily wastewater flow is 1,851 gallons per day (gpd). There are seven (7) apartment units on the second floor totaling 11 bedrooms and three (3) commercial tenants on the first floor(including Just Cats). The design flows for each section of the mixed-use building are listed in the design calculations. The design flow for Just Cats is based on historical usage for the business at a separate location. The design flow for the residential apartments is based on a rate of 110 gallons per day per bedroom and the commercial tenants are based on a design flow of 0.075 gallons per day per gross floor area. SITE CONDITIONS According to the Saratoga County NRCS, the primary soil type is silt loam. Test pits were performed to verify the soil conditions throughout the site. The eastern portion of the site in the area of development consists of fine sand with no mottling or groundwater observed to a depth of 7-8 feet below grade. Soil conditions transition to a sandy/silty loam more to the west beyond the extents of the proposed project. These areas contained mottling which indicates the presence of high groundwater. Percolation tests resulted in average rates ranging from 5 minutes per inch on the east end to 48 minutes per inch on the west end. The site currently drains east ultimately to existing culverts under Driscoll Road. TREATMENT Wastewater from the building's gra�ity flows to two (2) septic tanks in series. Both septic tanks will be 2,000 gallon capacity and will then flow to a 2,000 gallon pump tank Flow output from the pump tank travels to a distribution box that serves the seven (7) absorption trenches. The treatment ABD Engineers,LLP 2 Mixed-Zlse B�ilding 5190A-Sanitary Report Driscoll Road&Route 9 system is designed to satisfy the minimum area and minimum length of trenches including a 25% reduction for infiltrator chambers. Based on the design percolation rate of 7 minutes per inch, the application rate for the system is 1.0 gal/day/square foot. The system provides seven laterals at 100 feet in length for a total of 700 linear feet. Layout is as shown on the site plans. The system will be privately owned and maintained. Operation and maintenance will be conducted per the manufacturer's recommended guidelines. The guidelines will be distributed to the Owner at the time of installation. The proposed plan is designed in accordance with NYSDOH standards, N.Y.S. Department of Environmental Conservation standards, and good engineering practice. J;`�'�5:.�'- ..h�l-'iij.:' : f' f�.,�`:�"`�F�t( '�,t,,,,t ,. �f-�°�J �. ��}�.��'1 ' ' �,.7 C i�S' - t �j- c @ .�-.�'. :,.i.'- � Cl �' ,�+5��.'! �Cl �C'u�t m-j�8 Z t5� `'T �Q 94676 �`� Aq�ss��y Luigi A. Palleschi, P.E. ABD Engineers,LLP 3 Mixed-Zlse B�ilding 5190A-Sanitary Report Driscoll Road&Route 9 DESIGN CALCULATIONS Desi�n Flow 2°`'Floor Apartments Required daily design rate = 110 gpd/bedroom (11) 1-bedroom Required design flow= 1,210 gpd Just Cats Required daily design rate = 195 gpd(per historical usage) Required design flow= 195 gpd Tenant 1 Required daily design rate = 0.075 gpd/gfa 3,082 sf Required design flow= 231 gpd Tenant 2 Required daily design rate = 0.075 gpd/gfa 2,862 sf Required design flow= 215 gpd Outlet Pipe Avg. Flow = 1.29 gpm Peak Flow= 5.16 gpm Size: 4" Diameter Material: PVC SCH40 Slope: 2% Length: 15 feet Capacity = 157 gpm > 5.16 gpm ABD Engineers,LLP 4 Mixed-Zlse B�ilding 5190A-Sanitary Report Driscoll Road&Route 9