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HomeMy WebLinkAbout008 - Roers Building A and B - Snow Storage Analysismemo Page 1 TO: Matt Ekstrom, PE FROM: Celine Saucier, PE DATE: April 8, 2025 JOB NO.: 10549.002 RE: Snow Storage: Roers – Bozeman Apartments CC: Urgent For Review Please Comment Please Reply For Your Use This memo presents technical data for the snow storage plan at Roers – Bozeman Apartments site. The following design parameters were used to develop a snow storage plan: · A snow depth of 2 feet across the asphalt parking area for a snow volume. · Snow storage piles may be stacked maximum 8 feet high, with 2:1 side slopes. · 87,346 sq. ft. of parking area (this is the total asphalt area, including drive aisles and parking stalls) that will require snow removal into storage piles. · The (14) proposed snow storage piles will have an area of 15,298 sq. ft. (Table 1). In addition to the City of Bozeman recommendations, an in-house analysis was conducted to arrive at a “compaction factor.” The compaction factor is the percentile approximation of compaction the snow undergoes during plowing or removal. On January 30, 2018, Bozeman, MT received several inches of new snow as overnight temperatures dipped into the teens. The following day, measurements were taken of the weight of loosely placed snow in an empty 6” x 12” cylinder. The weight of compacted snow was then recorded and done so by placing (3) lifts of loose snow and compacting each lift. It was observed by (3) separate trials that loose snow was approximately 40% the weight of the well-compacted snow in this controlled environment. Thus, it was concluded that loose snow compacts to about 40% of its original volume, or the compaction factor is approximately 60%. Using a snow depth of 2 feet across the asphalt area, it is anticipated that 174,692 cubic feet of snow will need to be removed. Using the compaction factor of 60%, this volume reduces to 69,877 cubic feet (required snow storage volume). Snow Storage: Roers – Bozeman Apartments Page 2 Table 1 below summarizes how this volume of removed snow will easily be stored in the (7) trapezoidal-shaped snow storage piles that can be seen on attached Figure 1. Storage piles are located clear of landscaping, public rights-of-way, and outside of vision triangles. Pile Number Avg. Width (ft) Area (sq. ft.) Available Volume (cubic ft.) 1 10 291 1,397 2 10 1,069 5,131 3 10 3,754 18,019 4 10 3,620 17,376 5 10 927 4,450 6 100 5,222 40,105 7 9 415 1,844 Totals 15,298 88,322 *Volume calculation based on trapezoidal shape Table 1: Snow Storage Volume Calculation As shown in Table 1, the available snow storage volume of 88,322 cubic feet is adequate to accommodate the required storage volume of 69,877 cubic feet. This design approach is a conservative estimate of how much snow storage volume is required because it does not implement other obvious factors that will affect snow storage volume. Storage piles will inevitably be subject to freeze-thaw cycles. During these cycles, storage piles will be reduced by percolation and evaporation. The required snow storage volume will also be affected by vehicles in the parking area prohibiting the removal of all the snow. These factors were not applied in our required volume calculations. Moving the snow to the designated pile locations will ultimately be up to the contractor hired, however, pile locations were designed with the following anticipated removal plan: The snow will be cleared using full size pick-up trucks to plow the drive aisles and with a Bobcat/Skid Steer type vehicle for moving/piling the snow to designated snow pile locations on-site. Snow will be plowed to Piles 1-7 primarily with the pick-up front plow vehicles during mid-morning hours when the parking lot will be mostly empty. If necessary, the Bobcat/Skid Steer will be utilized to pile snow in these locations up to the allowable 8-ft snow pile height. The Bobcat/Skid Steer model that will be utilized will likely be a New Holland L160, which has a bucket reach of 11’7” and will allow it to easily pile the snow to the 8-ft height. Snow Storage: Roers – Bozeman Apartments Page 3 The applicant will provide this snow storage plan to any third party providing snow removal services. Furthermore, the applicant pledges to keep drive aisles clear for emergency services and to keep all areas clear of snow as is reasonable. Finally, the applicant assumes responsibility for all maintenance of sidewalks and ramps utilized to move snow and the applicant agrees to haul snow off site to a property owned by a member of the development group for this project, if necessary, in order to maintain parking and emergency access. 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THESE PRINTS MAY BE REDUCED. LINE BELOW MEASURES ONE INCH ON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2025COPYRIGHT © MORRISON-MAIERLE, SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\10549\002 - ALTA AND CONCEPT PLAN\ACAD\EXHIBITS\10549.002 SNOW STORAGE EXHIBIT.DWGREVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 1 Engineering Place Helena, MT 59602 406.442.3050 www.m-m.net engineers surveyors planners scientists MorrisonMaierle PLOTTED BY:ROSIE NICKELSON ON Apr/17/2025 ROERS-BOZEMAN APARTMENTS BOZEMAN MONTANA SNOW STORAGE EXHIBIT 10549.002 1 EX 1 CMS MEE 4/10/24 40 8020400 SCALE IN FEET   BUILDING A BUILDING B HUFFINE LANE (MDT ROW) VALLEY COMMONS DRIVE LAUREL PARKWAYSNOW STORAGE PROPOSED SNOW STORAGE PILES AREA CONSIDERED FOR SNOW STORAGE PILE 3 PILE 4 PILE 5 PILE 6 PILE 7 PILE 1 PILE 2