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HomeMy WebLinkAboutAPPENDIX D_BuffaloRunSnowStorageReport_20211014memo Page 1 TO: Matt Ekstrom, PE FROM: Cody Bender DATE: January 21, 2022 JOB NO.: 6475.005 RE: Snow Storage – Buffalo Run Site Plan CC: Urgent For Review Please Comment Please Reply For Your Use This memo presents technical data for the snow storage plan at the Buffalo Run Site Plan. 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. 174,080 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 (9) proposed snow storage piles will have an area of 8,148 sq. ft. 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 – Buffalo Run Site Plan Page 2 Using a snow depth of 2 feet across the asphalt area, it is anticipated that 348,160 cubic feet of snow will need to be removed. Using the compaction factor of 60%, this volume reduces to 139,264 cubic feet (required snow storage volume). Table 1 – 3 below summarizes how this volume of removed snow will be stored in the (9) 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 Ave. Width (ft.) Area (sq. ft.) Available Volume (cubic ft.) 1 7 645 2,211 2 22 1,841 12,050 TOTAL 2,486 14,262 *Volume calculation based on trapezoidal shape Table 1: Northwest Parking Lot Snow Storage Volume Calculation Pile Number Ave. Width (ft.) Area (sq. ft.) Available Volume (cubic ft.) 1 14 780 4,457 2 9 249 1,107 3 12 327 1,744 TOTAL 1,356 7,308 *Volume calculation based on trapezoidal shape Table 2: Northeast Parking Lot Snow Storage Volume Calculation Snow Storage – Buffalo Run Site Plan Page 3 Pile Number Ave. Width (ft.) Area (sq. ft.) Available Volume (cubic ft.) 1 22 2,062 13,497 2 13 1,170 6,480 3 20 537 3,437 4 20 537 3,437 TOTAL 4,306 26,850 *Volume calculation based on trapezoidal shape Table 3: Southeast Parking Lot Snow Storage Volume Calculation As shown in Table 1 – 3, the available snow storage volume of 48,420 cubic feet is inadequate to accommodate the required storage volume of 139,264 cubic feet. In this scenario, regarding a snowfall depth of 2’ across the site, the plan to reconcile the difference between required and available snow storage is that the property owner will pay to haul off any excess snow that exists beyond the designated snow piling locations. 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. 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: Snow Storage – Buffalo Run Site Plan Page 4 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 into piles primarily with the pick-up front plow vehicles during mid-morning hours or 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. W 1 1 2 3 1 2 3 2 4 VERIFY SCALE! THESE PRINTS MAY BE REDUCED. LINE BELOW MEASURES ONE INCH ON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2022COPYRIGHT © MORRISON-MAIERLE, INC., SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\6475\005 - BUFFALO RUN - SITE PLAN\ACAD\SHEETS\EXHIBITS\6475.005 - BUFFALO RUN SNOW STORAGE EXHIBIT_1-20-22.DWG PLOTTED BY:CODY BENDER ON Jan/21/2022 REVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 2880 Technology Blvd West Bozeman, MT 59718 406.587.0721 www.m-m.net engineers surveyors planners scientists MorrisonMaierle BUFFALO RUN SITE PLAN BOZEMAN MONTANA SNOW STORAGE 6475.005 1 EX1 CAB CAB MEE 1/2022 BOZEMAN 50 10025500 SCALE IN FEET SNOW STORAGE PROPOSED SNOW STORAGE PILES (COLOR VARIES) AREA CONSIDERED FOR SNOW STORAGE (COLOR VARIES)