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HomeMy WebLinkAbout015_Bronken Snow Storage Analysismemo Page 1 TO: Matt Ekstrom, PE FROM: Rosie Nickelson, EI DATE: August 30, 2021 JOB NO.: 2200.048 RE: Snow Storage – Bronken Warehouse CC: Urgent For Review Please Comment Please Reply For Your Use This memo presents technical data for the snow storage plan at the Home 2 Hotel. 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. • 61,675 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 (4) proposed snow storage piles will have an area of 9,017 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 – Bronken Warehouse Page 2 Using a snow depth of 2 feet across the asphalt area, it is anticipated that 123,350 cubic feet of snow will need to be removed. Using the aforementioned compaction factor of 60%, this volume reduces to 49,340 cubic feet (required snow storage volume). Table 1 below summarizes how this volume of removed snow will easily be stored in the (4) trapezoidal-shaped snow storage piles that can be seen on attached Figure 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 28 4832 33134 2 25 1941 13044 3 18 1122 6981 4 18 1122 6981 Totals 9017 60140 *Volume calculation based on trapezoidal shape Table 1: Snow Storage Volume Calculation As shown in Table 1, the available snow storage volume of 60,140 cubic feet is adequate to accommodate the required storage volume of 49,340 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 – Bronken Warehouse 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 1-6 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. S89°52'46"E 222.49'S89°52'46"E 230.88'N0°01'20"E 497.68'N87°59'02"W 222.63'N87°59'02"W 213.19'S2°00'58"W 512.38'S2°00'58"WN2°00'58"E45.02' N89°52'46"W 155.00'342.68'F F TV TV TV TV EEDYH DYH I I P P P WV WVWV WVWV WV WVWV BP BP BP BP BP BP BP BP BP NG NG NG NG NG NG NGS FIGURE NUMBER © PROJECT NO.DRAWN BY: DSGN. BY: APPR. BY: DATE: COPYRIGHT MORRISON-MAIERLE, INC.,2021 N:\2200\048 - Stella Fria Site Plan\ACAD\Exhibits\SNOW STORAGE.dwg Plotted by rosie nickelson on Aug/30/2021 engineers surveyors planners scientists MorrisonMaierle 2880 Technology Blvd West Bozeman, MT 59718 406.587.0721 www.m-m.net 2200.048  FIG. 1 RSN BOZEMAN MONTANA SNOW STORAGE EXHIBIT MEE BRONKEN WAREHOUSE MEE 08/30/2021 30 600 SCALE IN FEET SNOW STORAGE PROPOSED SNOW STORAGE PILES AREA CONSIDERED FOR SNOW STORAGE 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. PILE 1 PILE 2 PILE 3 PILE 4 NELSON RDPRINCE LANE