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ALLIED
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SERVICES,INC.
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MEMO
Project Name: Gallatin County Regional Park Maintenance Building
Project Number: AESI 22-002
Date: January 6,2023
Re: Sanitary Sewer&Domestic Water Demand
MEMO DETAILS:
The purpose of this memo is to outline the estimated average daily&peak hour sanitary sewer
demand as well as the maximum&average daily domestic water demand for the proposed site
development of Tract 3A-1 COS 2202B.The demand estimate is based on guidelines provided in the
Montana Department of Environmental Quality(MDEQ)Circular 4 and the City of Bozeman Design
Standards and Specifications.
The proposed improvements involve construction of a 1,280-sf park maintenance and storage building
at the Gallatin County Regional Park. Existing water and sanitary sewer mains(both 8"diameter)are
located in Vaquero Parkway.New water and sewer services will be provided to the structure via the
existing mains located in Vaquero Parkway.
Sanitary Sewer Demand
An average wastewater flow rate of 13 gallons per day per employee was assumed as outlined in
MDEQ-Circular 4 Table 3.1-1 "Typical Wastewater Flows from Commercial, Industrial, and Other
Nonresidential Sources". The peaking factor was calculated based on the formula provided in section
V.13.6 of the COB Design Standards and Specifications. Please see the attached calculations for
additional information.A summary is provided below.
• Assumed number of employees=3
• Average day demand=39 gpd
• Peaking factor(P=0.003)=4.453
• Peak hour demand=0.12 gpm
32 Discovery Drive ♦ Bozeman,MT 59718 ♦ (406)582-0221 ♦ Fax(406)582-5770
01/06/2023
Domestic Water Demand
An average daily water usage rate of 13 gal/day/employee was assumed for the proposed development
and is consistent with the average wastewater flow rate given by MDEQ-Circular 4.A maximum day
to average day ratio of 2.3:1 and a peak hour to average day ratio of 3:1 was used as outlined in
section V.A.4 of the COB Design Standards and Specifications.Please see the attached calculations
for additional information.A summary is provided below.
• Assumed number of employees=3
• Average daily demand=39 gpd
• Maximum daily demand=90 gpd
• Peak hour demand=0.08 gpm
Please contact Madeline Good and/or Rory Romey at 406-582-0221 or
mgood a.alliedengineerin�?.com;rromey c�alliedenQineering.com with any questions or if additional
information is required.
Sincerely,
Allied Engineering Services,Inc.
17" e7��
Rory Romey,PE
Civil Engineer
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RORY SCOTT
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Allied Engineering Services,Inc. Memo Page 2
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