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HomeMy WebLinkAbout004 Snow Storage Analysismemo Page 1 TO: Matt Ekstrom, PE FROM: Celine Saucier, PE DATE: February 17, 2025 JOB NO.: 10554.001 RE: Snow Storage – 3100 W Huffine CC: Urgent For Review Please Comment Please Reply For Your Use This memo presents technical data for the snow storage plan at 3100 W Huffine 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. · 25,344 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 (3) proposed snow storage pile will have an area of 3,183 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 to try and approximate the percent compaction the snow receives as plows remove it from its original state. On January 30, 2018, Bozeman, MT received several inches of new snow as temperatures dipped into the teens overnight. 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 also 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%. Snow Storage – 3100 W Huffine Page 2 Using a snow depth of 2 feet across the asphalt area, it is anticipated that 50,688 cubic feet of snow will need to be removed. Using the compaction factor of 60%, this volume reduces to 20,275 cubic feet (required snow storage volume). Table 1 below summarizes how this volume of removed snow will easily be stored in the (3) trapezoidal-shaped snow storage piles that can be seen on attached Exhibit 1. Storage piles are located clear of landscaping, public right-of-ways, and outside of vision triangles. Pile Number Avg. Width (ft) Area (sq. ft.) Available Volume* (cubic ft) 1 23 479 3,164 2 35 1,212 8,590 3 15 1,492 8,753 Totals 3,183 20,507 *Volume calculation based on trapezoidal shape Table 1: Snow Storage Volume Calculation As shown in Table 1, the available snow storage volume of 20,507 cubic feet is adequate to accommodate the required storage volume of 20,275 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 freezing and thawing cycles. During these cycles, storage piles will be reduced by percolation and evaporation. The required snow storage volume will also be affected due to vehicles in the parking area prohibiting the removal of all the snow. These factors were not taken into account in our required volume calculations. Snow Storage – 3100 W Huffine Page 3 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 1-3 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. 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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BY: DATE: COPYRIGHT MORRISON-MAIERLE,2025 Plotted by rosie nickelson on Feb/17/2025 engineers surveyors planners scientists MorrisonMaierle 2880 Technology Blvd West Bozeman, MT 59718 406.587.0721 www.m-m.net N:\10554\001 - 3100 W Huffine\ACAD\Exhibits\10554.001_SnowStorage.dwg10554.002  EX. 1 3100 W HUFFINE BOZEMAN MONTANA SNOW STORAGE EXHIBIT RSN RSN MEE 02/2025 20 4010200 SCALE IN FEET Know what's below. before you dig.Call R THIS SITE HAS BEEN DESIGNED TO BE ACCESSIBLE TO INDIVIDUALS WITH DISABILITIES IN ACCORDANCE WITH THE AMERICANS WITH DISABILITIES ACT. SNOW STORAGE PROPOSED SNOW STORAGE PILES AREA CONSIDERED FOR SNOW STORAGE PILE 1 PILE 2 PILE 3