HomeMy WebLinkAbout20230996 395 Broadway Site Plan Water Sewer Report
October 2, 2023
Mr. Mark Torpey, Planning Board Chairman
City of Saratoga Springs
City Hall
474 Broadway
Saratoga Springs, NY 12866
RE: Water/Sewer Letter Report – 395 Broadway Sketch Plan
Dear Mr. Torpey:
The 395 Broadway Sketch Plan project proposes the renovation of the existing 2-story commercial building
previously occupied by Fingerpaint. The renovation includes modifications to the existing 2-story structure
to convert the structure into an office building. The project also includes the addition of two (2) stories with
new office uses creating a new 4-story commercial office building. The existing parking area will be modified,
and the existing electrical utilities will be underground. The parking area will also be modified to include an
electric sliding entry gate. This letter/report will describe the water use and wastewater generation for the
proposed development. Public water service is proposed to be provided by the City of Saratoga Springs
Department of Public Works.
WASTEWATER DEMANDS
The wastewater generated by the existing Fingerpaint facility and proposed development has been
calculated for cumulative uses in the building. The total new wastewater demands have been calculated
based on the 10 State Standards of 0.1 gallons per day per square foot (gpd/sf) for commercial use. The
Average Daily Wastewater Flow and Peak Hour Wastewater Flow generated for the existing development is
3,485 gpd and 10.89 gpm, respectively. A detailed outline of the wastewater flow calculations is included
within Appendix A of this letter/report.
Following the renovation of the existing facility, the Average Daily Wastewater Flow and Peak Hour
Wastewater Flow generated for the proposed development is 6,970 gpd and 21.78 gpm, respectively.
Therefore, the proposed building modifications include an increase in the Average Daily Wastewater Flow
and Peak Hour Wastewater Flow of 3,485 gpd and 10.89 gpm, respectively for the 395 Broadway Sketch Plan
facility.
The wastewater from the proposed development will be conveyed to the existing public sewer main along
Broadway via the exiting 6” sanitary sewer service.
WATER DEMANDS
The water usage by the existing Fingerpaint facility and proposed development has been calculated for
cumulative uses in the building based on the 10 State Standards of 0.1 gallons per day per square foot
(gpd/sf) for commercial use. The Average Day, Max Day, and Max Hour water usage rates for the existing
site have been calculated to be 2.4 gpm, 4.0 gpm, and 10.9 gpm, respectively. A detailed outline of the
water demand calculations is included within Appendix A of this report.
Following the renovation of the existing facility, the Average Day, Max Day, and Max Hour water usage rate
for the proposed development is 4.8 gpm, 8.0 gpm, and 21.8 gpm, respectively. Therefore, the proposed
Page 2
building modifications include an increase in the Average Day, Max Day, and Peak Hour water usage rates of
2.4 gpm, 4.0 gpm, and 10.9 gpm, respectively.
The water service for the proposed development will be provided by the existing water main location along
Broadway via the existing water service connection.
The estimated increase in water usage and wastewater flows for the 395 Broadway Sketch Plan are
relatively insignificant in comparison with the water and wastewater capacity in the area. Therefore, it is
expected that the increase in water and sanitary sewer demands will not have an adverse impact on the
existing utilities.
Please review this letter/report and pending your approval please provide an approval letter for this
connection. Please contact me at 899-5243 ext. 104 if you have any questions or require any additional
information. Thank you.
Sincerely,
LANSING ENGINEERING, PC
Yates Scott Lansing, PE, CPESC, CPSWQ
Cc:
Page 3
Appendix A
Water System & Sewer System Demand Calculations
Hydraulic Capacity Calculations
Project:Gravity:Yes
Date:10/2/2023 Forcemain: No
gpd = Gallons Per Day 100 gpd
Residential Flow = Units x Residents per Unit x Per Capita Flow 0.1 gpd
Comercial Flow = Square Feet x Flow per Square Feet 35 gpd
Restaurant Flow = Number of Seats x Flow Per Seat 0
Project Area Type Residents/Unit Units Square Feet Seats Flow
1 Commercial 34,848 3,485 gpd
2 0 gpd
3 0 gpd
4 0 gpd
5 0 gpd
3,485 gpd
gpd = Gallons Per Day 100 gpd
Residential Flow = Units x Residents per Unit x Per Capita Flow 0.1 gpd
Comercial Flow = Square Feet x Flow per Square Feet 35 gpd
Restaurant Flow = Number of Seats x Flow Per Seat 0
Contributing Area Type Residents/Unit Units Square Feet Seats Flow
1 0 gpd
2 0 gpd
3 0 gpd
4 0 gpd
5 0 gpd
0 gpd
gpm = Galons Per Minute PHF = Peak Hour Factor
gpm = gpd / 1,440 (Minutes Per Day)P = Population in Thousands
3,485 gpd PHF = (18 + P1/2)
2.42 gpm (4+ P1/2)
0 PHF =4.50
0
Cumulative Peak Hour Wastewater Flow = Total Design Average Daily Flow x Peak Hour Factor
15,682 gpd
10.89 gpm
Project Design Average Wastewater Flow
Per Capita Flow
Flow Per Sq Ft
Per Capita Flow
395 Broadway Existing (Fingerpaint)
Flow Per Seat
Total Population
Project Wastewater System Capacity Design
Peak Hour Factor
Cumulative Peak Hour Wastewater Flow
Total Design Average Daily Wastewater Flow =
Total Design Average Daily Wastewater Flow =
Total Population in Thousands (P)=
Total Design Average Daily Wastewater Flow (gpm) =
Total Population =
Total Design Average Daily Wastewater Flow =
Flow Per Sq Ft
Flow Per Seat
Total Population
Contributing Area Design Average Wastewater Flow
Cumulative Peak Hour Wastewater Flow =
Cumulative Peak Hour Wastewater Flow =
LANSING ENGINEERING, PC
Hydraulic Capacity Calculations
gpm = Galons Per Minute PHF = Peak Hour Factor
gpm = gpd / 1,440 (Minutes Per Day)P = Population in Thousands
3,485 gpd
2.42 gpm
0.0 PHF =
0
Cumulative Peak Hour Wastewater Flow = Total Design Average Daily Flow x Peak Hour Factor
15,682 gpd
10.89 gpm
6 in
0.013 Provided Required
0.005 ft/ft 178.54 >10.89
1.49
0.196 sf
0.125 ft
2.03 fps
0.40 cfs
178.54 gpm
in
1.49 Provided Min Required
0.000 sf 0.00 <10.89
2.00 fps Provided Max Required
6.00 fps 0.00 <10.89
0.00 cfs
0.00 cfs
0.00 gpm
0.00 gpm
Full Capacity (min) =
Full Capacity (max) =
Full Velocity (min) =
Full Capacity (Qfmin) =
Full Capacity (Qfmax) =
Full Velocity (max)=
Based on Mannings Equation Qf= (k/n)AR2/3S1/2 and 2fps Cleansing Velocity
Trial Pipe Size =
k =
Flow Area (A) =
Full Capacity (Qf) =
Full Capacity =
Forcemain Not Proposed
Flow Area (A) =
Hydraulic Radius (R)=
Slope (S) =
Full Velocity =
Trial Pipe Size =
Based on Mannings Equation Qf= (k/n)AR2/3S1/2
Mannings Number (n) =
k =
Peak Hour Factor
Total Design Average Daily Wastewater Flow =PHF = (18 + P1/2)
Total Design Average Daily Wastewater Flow (gpm) =(4+ P1/2)
OK, Use Pipe Size Chosen
Adjust Pipe Size
Gravity Pipe Size Required
Total Population =4.50
Total Population in Thousands (P)=
Cumulative Peak Hour Wastewater Flow
Cumulative Peak Hour Wastewater Flow =
Cumulative Peak Hour Wastewater Flow =
Project + Contributing Area Wastewater System Capacity Design
LANSING ENGINEERING, PC
Hydraulic Capacity Calculations
178.54 gpm
10.89 gpm Provided Required
167.65 gpm 167.65 >0.10
241412 gpd
93.90 %
2516 LF
0.48 Miles
50
0.10 gpm
Length of Pipe for Local Network =
OK
Gallons/inch of Pipe Diameter/Mile/ Day)
Full Design Capacity =
Calculated Design Flow =
Excess Capacity =
Maximum Allowable Infiltration =
Inflow & Infiltration (Gravity Sewer)
Pipe Excess Capacity = Full Design Capacity - Calculated Design Flow
LANSING ENGINEERING, PC
Hydraulic Capacity Calculations
Project:Gravity:Yes
Date:10/2/2023 Forcemain: No
gpd = Gallons Per Day 100 gpd
Residential Flow = Units x Residents per Unit x Per Capita Flow 0.1 gpd
Comercial Flow = Square Feet x Flow per Square Feet 35 gpd
Restaurant Flow = Number of Seats x Flow Per Seat 0
Project Area Type Residents/Unit Units Square Feet Seats Flow
1 Commercial 69,696 6,970 gpd
2 0 gpd
3 0 gpd
4 0 gpd
5 0 gpd
6,970 gpd
gpd = Gallons Per Day 100 gpd
Residential Flow = Units x Residents per Unit x Per Capita Flow 0.1 gpd
Comercial Flow = Square Feet x Flow per Square Feet 35 gpd
Restaurant Flow = Number of Seats x Flow Per Seat 0
Contributing Area Type Residents/Unit Units Square Feet Seats Flow
1 0 gpd
2 0 gpd
3 0 gpd
4 0 gpd
5 0 gpd
0 gpd
gpm = Galons Per Minute PHF = Peak Hour Factor
gpm = gpd / 1,440 (Minutes Per Day)P = Population in Thousands
6,970 gpd PHF = (18 + P1/2)
4.84 gpm (4+ P1/2)
0 PHF =4.50
0
Cumulative Peak Hour Wastewater Flow = Total Design Average Daily Flow x Peak Hour Factor
31,363 gpd
21.78 gpm
Project Design Average Wastewater Flow
Per Capita Flow
Flow Per Sq Ft
Per Capita Flow
395 Broadway Proposed
Flow Per Seat
Total Population
Project Wastewater System Capacity Design
Peak Hour Factor
Cumulative Peak Hour Wastewater Flow
Total Design Average Daily Wastewater Flow =
Total Design Average Daily Wastewater Flow =
Total Population in Thousands (P)=
Total Design Average Daily Wastewater Flow (gpm) =
Total Population =
Total Design Average Daily Wastewater Flow =
Flow Per Sq Ft
Flow Per Seat
Total Population
Contributing Area Design Average Wastewater Flow
Cumulative Peak Hour Wastewater Flow =
Cumulative Peak Hour Wastewater Flow =
LANSING ENGINEERING, PC
Hydraulic Capacity Calculations
gpm = Galons Per Minute PHF = Peak Hour Factor
gpm = gpd / 1,440 (Minutes Per Day)P = Population in Thousands
6,970 gpd
4.84 gpm
0.0 PHF =
0
Cumulative Peak Hour Wastewater Flow = Total Design Average Daily Flow x Peak Hour Factor
31,363 gpd
21.78 gpm
6 in
0.013 Provided Required
0.005 ft/ft 178.54 >21.78
1.49
0.196 sf
0.125 ft
2.03 fps
0.40 cfs
178.54 gpm
in
1.49 Provided Min Required
0.000 sf 0.00 <21.78
2.00 fps Provided Max Required
6.00 fps 0.00 <21.78
0.00 cfs
0.00 cfs
0.00 gpm
0.00 gpm
Full Capacity (min) =
Full Capacity (max) =
Full Velocity (min) =
Full Capacity (Qfmin) =
Full Capacity (Qfmax) =
Full Velocity (max)=
Based on Mannings Equation Qf= (k/n)AR2/3S1/2 and 2fps Cleansing Velocity
Trial Pipe Size =
k =
Flow Area (A) =
Full Capacity (Qf) =
Full Capacity =
Forcemain Not Proposed
Flow Area (A) =
Hydraulic Radius (R)=
Slope (S) =
Full Velocity =
Trial Pipe Size =
Based on Mannings Equation Qf= (k/n)AR2/3S1/2
Mannings Number (n) =
k =
Peak Hour Factor
Total Design Average Daily Wastewater Flow =PHF = (18 + P1/2)
Total Design Average Daily Wastewater Flow (gpm) =(4+ P1/2)
OK, Use Pipe Size Chosen
Adjust Pipe Size
Gravity Pipe Size Required
Total Population =4.50
Total Population in Thousands (P)=
Cumulative Peak Hour Wastewater Flow
Cumulative Peak Hour Wastewater Flow =
Cumulative Peak Hour Wastewater Flow =
Project + Contributing Area Wastewater System Capacity Design
LANSING ENGINEERING, PC
Hydraulic Capacity Calculations
178.54 gpm
21.78 gpm Provided Required
156.76 gpm 156.76 >0.10
225731 gpd
87.80 %
2516 LF
0.48 Miles
50
0.10 gpm
Length of Pipe for Local Network =
OK
Gallons/inch of Pipe Diameter/Mile/ Day)
Full Design Capacity =
Calculated Design Flow =
Excess Capacity =
Maximum Allowable Infiltration =
Inflow & Infiltration (Gravity Sewer)
Pipe Excess Capacity = Full Design Capacity - Calculated Design Flow
LANSING ENGINEERING, PC
Water System Demand Rates
Project:
Date:9/29/2023
gpd = Gallons Per Day gpd
Residential Flow = Units x Residents per Unit x Per Capita Flow gpd
Comercial Flow = Square Feet x Flow per Square Feet
Average Day = Average Per Capita Flow Percentage %
Max Day = Maximum Per Capita Flow Percentage %
Peak Day = Peak Per Capita Flow Percentage in One Hour %
Project Area Type Residents/Unit Units Square Feet
1 Commercial 34,848 3,485 gpd 2.42 gpm
2 0 gpd 0.00 gpm
3 0 gpd 0.00 gpm
4 0 gpd 0.00 gpm
5 0 gpd 0.00 gpm
3,484.8 gpd 2.4 gpm
3,484.8 gpd 2.4 gpm
5,749.9 gpd 4.0 gpm
15,681.6 gpd 10.9 gpm
gpm = Galons Per Minute SF = Square Feet
gpm = gpd / 1,440 (Minutes Per Day)
SF
gpm
hours
Fire Flow Demands
Compliant Automatic Sprinkler System:
Building Use:
Project Water Demand
Per Capita Flow
Flow Per Sq Ft
Total Water Demand for Service Area =
450
Total Average Day Water Demand for Service Area =
Total Max Day Water Demand for Service Area =
Total Peak Hour Water Demand for Service Area =
395 Broadway Existing (Fingerpaint)
Total Population
Flow
Average Day
Max Day
Peak Day
100
0.1
0
100
165
Total Fire-Flow Calculation Area (SF)=17,424
Building Construction Type:Type V-A In accordance with IBC
Minimum Fire-Flow (gpm) =
Flow Duration (hours) =
625
2.00
Other
NFPA 13 Sprinkler System
In accordance with IFC Appendix B
In accordance with IFC Section 903.3
LANSING ENGINEERING, PC
Water System Demand Rates
Project:
Date:10/2/2023
gpd = Gallons Per Day gpd
Residential Flow = Units x Residents per Unit x Per Capita Flow gpd
Comercial Flow = Square Feet x Flow per Square Feet
Average Day = Average Per Capita Flow Percentage %
Max Day = Maximum Per Capita Flow Percentage %
Peak Day = Peak Per Capita Flow Percentage in One Hour %
Project Area Type Residents/Unit Units Square Feet
1 Commercial 69,696 6,970 gpd 4.84 gpm
2 0 gpd 0.00 gpm
3 0 gpd 0.00 gpm
4 0 gpd 0.00 gpm
5 0 gpd 0.00 gpm
6,969.6 gpd 4.8 gpm
6,969.6 gpd 4.8 gpm
11,499.8 gpd 8.0 gpm
31,363.2 gpd 21.8 gpm
gpm = Galons Per Minute SF = Square Feet
gpm = gpd / 1,440 (Minutes Per Day)
SF
gpm
hours
Fire Flow Demands
Compliant Automatic Sprinkler System:
Building Use:
Project Water Demand
Per Capita Flow
Flow Per Sq Ft
Total Water Demand for Service Area =
450
Total Average Day Water Demand for Service Area =
Total Max Day Water Demand for Service Area =
Total Peak Hour Water Demand for Service Area =
395 Broadway Proposed
Total Population
Flow
Average Day
Max Day
Peak Day
100
0.1
0
100
165
Total Fire-Flow Calculation Area (SF)=17,424
Building Construction Type:Type V-A In accordance with IBC
Minimum Fire-Flow (gpm) =
Flow Duration (hours) =
625
2.00
Other
NFPA 13 Sprinkler System
In accordance with IFC Appendix B
In accordance with IFC Section 903.3
LANSING ENGINEERING, PC