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HomeMy WebLinkAboutHaggerty Lane SP1 Civil_LA NarrativeSITE PLAN REVIEW Haggerty Lane Location: Bozeman, MT Legal Description: Lot 2A1, Section 08, Township 02S, Range 06E, 0.468 Acres, Rearr Elks Club Property, Gallatin County Project Narrative Existing Land Use The project site is approximately 0.47-acres and is an undeveloped lot. A variety of adjacent uses surround the project site to the northwest, southwest, and southeast. To the northwest and southeast are existing commercial buildings. To the southwest is a City of Bozeman property with softball fields immediately adjacent that are managed Parks and Recreation uses. To the northeast is Haggerty Lane, which is within the City of Bozeman right of way and bordering this right of way is Montana Department of Transportation right of way for Interstate 90. The parcel is zone B-2M. Existing Infrastructure Transportation The project site is serviced by Haggerty Lane (Minor Arterial). There is a gravel trail within the City of Bozeman property to the southwest for the public to access the park system from the property. A new 6-foot-wide concrete sidewalk is proposed along the property frontage on Haggerty Lane. Public Utilities WATER An 8-inch ductile iron water main runs along the southwest property boundary within the City of Bozeman parcel. There is one existing fire hydrant located near the southwest property boundary. See Civil Sheet C2.1 for more details. SANITARY SEWER The sewer main servicing the project area is an 8-inch PVC line running northeast from the City of Bozeman Park parcel along the east property boundary. There is a separate 10-inch PVC sewer main, connected to the 8-inch sewer main, which travels northwest near the north property boundary. This sewer main currently collects flow from the City of Bozeman Park and the existing commercial building to the southeast. See Civil Sheet C2.1 for more details. STORMWATER There is no existing storm water system for the subject property. Haggerty Lane has an existing inlet located near the north property frontage which collects drainage from Haggerty Lane and discharges the stormwater to the surface on the north side of the street via a 15-inch RCP storm drain. See Civil Sheet C2.1 for more details. Proposed Improvements Site Improvements Landscape & Irrigation Landscape improvements are proposed at building entries and along the building perimeter to enhance the pedestrian experience and support overall site design. Plantings will consist of ornamental trees, shrubs, groundcovers, perennials, and ornamental grasses to provide seasonal interest and texture throughout the site. On the adjacent property to the southeast, large canopy trees and a new shrub planting bed are proposed to establish a visual buffer between the existing parking lot and the new buildings. Areas disturbed by grading with receive restorative seeding to repair existing landscape areas. An approximately 1,500 square foot amenity space is located at the southwest corner of the property and is designed as a shared gathering area for tenants. This space includes integrated seat walls, site furnishings, an artificial turf lawn for flexible use, and a fire pit feature to encourage year-round use. The amenity area is buffered from the adjacent trail corridor with shrub plantings to provide visual screening and create a comfortable environment. All proposed landscaping will comply with all requirements listed in the Bozeman Municipal Code and the City of Bozeman Landscape and Irrigation Performance and Design Standards. Proposed landscaping will compliment proposed architecture and will enhance the experience of site users, as well as views from adjacent properties. Mechanical equipment and the trash enclosure will be screened using landscape screening methods. Due to existing utilities and clear vision triangle requirements, street trees cannot be accommodated within the street frontage landscaping. However, groundcovers and ornamental grasses are proposed to provide an attractive streetscape treatment. The proposed irrigation system improvements will consist of three zones, including one drip zone for planting beds, one dedicated tree drip zone, and one spray zone for seeded areas. The system will connect to a single 1-inch point of connection located within unit 5-W, served by a 1-inch mainline. All irrigation improvements will be designed in accordance with the City of Bozeman Landscape and Irrigation Performance and Design Standards. The system will be designed to promote efficient water use, minimize overspray, and provide adequate coverage for all proposed landscaped areas. See landscape sheets L1.1 – L4.2 for more details about the proposed landscape and irrigation improvements. Utility Improvements WATER Two-inch water services are proposed to serve the domestic and irrigation demand of each building. There are no water main improvements proposed, and the buildings are not equipped with a fire sprinkler system. SEWER We are proposing to remove the existing 10-inch PVC sewer main within the property and relocate the existing 8-inch PVC sewer main approximately 5-feet to the southeast to create enough of a buffer from proposed buildings. The proposed 8-inch sewer main will then cross Haggerty Lane to the north and connect to the existing 18- inch sewer main with a new manhole connection. The existing 30-foot sewer easement for the 8-inch sewer main is proposed to be reduced to 25-feet and the existing easement for the 10-inch sewer main will be removed. The proposed buildings will connect to the proposed 8-inch and 10—inch sewer mains via separate 4-inch sewer services. STORMWATER A permeable paver and subsurface gravel storage system with an underdrain will be added within the new paved drive-aisle to capture drainage from the proposed structures and new hardscape improvements. The subsurface system will be connected to the existing inlet in Haggerty Lane and overflow to the north as it has historically. The subsurface system is designed to limit the stormwater discharge to the pre-development peak flow via an overflow structure and orifice. See Civil Sheet C5.1 for more details about the proposed new stormwater facilities. Water Rights Information All irrigation water use is expected to come from the City of Bozeman water distribution network; therefore, cash-in-lieu be necessary. See Irrigation Sheet L3.1 for more details about the irrigation system demand calculations.