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Home My WebLink About005 Water and Sewer Report Velocity Car Wash - BOZEMAN WATER & SEWER IMPROVEMENTS UTILITY BASIS OF DESIGN REPORT February 2025 PREPARED BY: MMI #: 10554.001 Table of Contents INTRODUCTION ........................................................................................................................................................ 1 1 EXISTING WASTEWATER FACILITIES ...................................................................................................... 1 2 EXISTING WATER FACILITIES .................................................................................................................... 1 3 PROPOSED WASTEWATER FACILITIES .................................................................................................. 2 4 PROPOSED WATER FACILITIES ................................................................................................................ 2 APPENDICES Appendix A – Water and Sewer Demand Calculations Prepared By: Morrison Maierle, Inc 2880 Technology Blvd. W. Bozeman, Montana 59771 Phone: (406) 587-0721 Fax: (406) 922-6702 Written By: CMS Checked By: JZ Approved By: MEE PROJECT NO.: 10554.001 INTRODUCTION This design report provides the criteria used as a basis of design for the sewer line proposed to service the Velocity Car Wash. This report is submitted in conjunction with the completed plans and specifications to the City of Bozeman and is organized following the outline recommended in DEQ-2, Chapter 10. Section 11.1, Engineering Reports. The Velocity Carwash project site is located at 3100 West Main Street within the City of Bozeman, Montana. The legal description for the lot is Gallatin County, Section 11, Township 02 South, Range 05 East, Tract 2 AS DESIG ASSRS Plat being 150’ x 300’ less HWRY Buronepe Annexation. The existing project site is a developed lot where the Montana Woolen Shop used to be. See the vicinity map for location details. The proposed water and sewer services will be owned and maintained by Velocity Carwash. 1 EXISTING WASTEWATER FACILITIES There is an existing City of Bozeman 8-inch PVC sewer main located to the northeast of the existing site per the Infrastructure viewer. There are two sewer manholes adjacent to the site that are located on the west and east sides of the mall access road. The current design proposes tying a new service into the 8-inch main between these two manholes. An existing sewer cleanout was found during the site survey, but no additional information was found as to the existence and location of the sewer service for the existing building. The existing service, if found, will be capped at the main and abandoned per City of Bozeman standards. 2 EXISTING WATER FACILITIES There is an existing City of Bozeman 8-inch D.I. water main located just north of the northern property line per the Infrastructure viewer. The current design proposed tying a new water service into the existing 8-inch main. There is also an existing fire hydrant (#980) located across the mall access road that is approximately ~200-feet from the proposed building. No new fire hydrants are proposed to be installed with this project. 3 PROPOSED SEWER IMPROVEMENTS The Velocity Car Wash will be located on property zoned B-2 (Community business district) per the City of Bozeman’s zoning map. This project involves the installation of an 8-inch sewer service lateral that will tie into the existing 8-inch sewer main located to the northeast of the site. The sewer service lateral will include one line to service the proposed carwash building and restroom and another line that will service the recirculation tank. The sewer service laterals will maintain a slope of 2% from the building to the existing main tie-in. The laterals will be designed with cleanouts at any proposed bends and at the building entrance to provide maintenance and flushing access. Sewer facilities included in this project are designed with adequate capacity to handle flow of the maximum peak hour flow rate for the car wash. Per the City of Bozeman Design Standards and Specifications Section V and owner provided information, the building demands were estimated to be 31.4 GPM for average daily flow, and 129.5 GPM for peak hour sewer demand. Calculations are attached in the appendices. 4 PROPOSED WATER IMPROVEMENTS This project involves the installation of a potable 4-inch D.I. water service lateral that will tie into the existing 8-inch water main located north of the site. There is no fire service proposed for this building. Water facilities included in this project are designed with adequate capacity to handle flow of the maximum peak hour flow rate for the car wash. Per the City of Bozeman Design Standards and Specifications Section V and owner provided information, the building demands were estimated to be 37 GPM for average daily flow, and 151.6 GPM for peak hour water demand. Calculations are attached in the appendices. For the purposes of landscape management – the site will incorporate landscape irrigation to ensure the upkeep of its visual appeal. Outdoor design studios have calculated an average irrigation water demand of 16 GPM. This irrigation system is vital for sustaining the landscaping’s aesthetics and vitality, in line with the site’s water management goals. Wastewater Daily Flow Analysis Velocity Car Wash Average Daily Flow Daily Water Usage (Applicant Provided) 17,750 gpd Estimated Vehicle/Day 355 vehicles Estimated Water Usage/Vehicle 50 gallons/vehicle % of Loss due to drive-off/evaporation 15% See Note #1 below Est. Wastewater Discharge/Vehicle 42.5 gallons/vehicle Estimated Daily Wastewater Discharge 15,087.5 gallons/day Conversation to Residential Population 65 gallons/person/day Equivalent Population 232 people Peaking Factor = . ., P= Population/thousands = 232/1000 = 0.232 Peaking Factor = 4.12 Peak Hour Sewer Demand Average Daily Flow 15,087.5 gpd 1,886 gph 8-hour period 31.4gpm Peaking Factor 4.12 Pek Hour Sewer Demand 7,770.32 gph 129.5 gpm 1039cfh 17.31cfm 0.289cfs Notes: 1. Data provided from a report prepared by International Carwash Association Estimated Water Demand Analysis Velocity Car Wash Average Daily Flow Daily Water Usage (Applicant Provided) 17,750 gpd Estimated Vehicle/Day 355 vehicles Estimated Water Usage/Vehicle 50 gallons/vehicle Estimated Daily Wastewater Usage 17,750 gpd Conversation to Residential Population 65 gallons/person/day Equivalent Population 273 people Peaking Factor = . ., P= Population/thousands = 273/1000 = 0.273 Peaking Factor = 4.1 Peak Hour Sewer Demand Average Daily Flow 17,750 gpd 2,219 gph 8-hour period 37gpm Peaking Factor 4.1 Pek Hour Sewer Demand 9,098gph 151.6 gpm 1,216cfh 20.3cfm 0.34cfs Notes: 1. Data provided from a report prepared by International Carwash Association