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HomeMy WebLinkAboutENGINES & ENERGY CONVERSION LAB - BDR - BDR120006 - SUBMITTAL DOCUMENTS - ROUND 2 - ALTERNATIVE COMPLIANCE REQUESTII y .. I F Y SITE LIGHTING CALCULATION PLAN Al" —r e9 0' i 5 30 60' O29' 7��m ms�o® ©S7��F�+Ylii�tliiYOO ©a®00 SITE LIGHTING CALCULATION BASIC DEVELOPMENT REVIEW ENGINES AND ENERGY CONVERSION LAB FORT COLLINS, COLORALI0 ...«....� ........,a- • . 5 M E E T 1 OF t $EPTEMBER S. �012 inability to adequately light people's faces resulting in poor recognition. Ia o /±-I i BfChISINCtIOPe www.nomtan.com In closing, the light fixtures we have selected are chosen for their simplicity and their ability to blend into the character of the project while still providing the light levels for safety. Thank you for your consideration into this matter. Sincerely, H. Robert Hosanna Project Architect The Neenan Company 2620 E. Prospect Road, Site 100 1 Fort Collins, CO 80525 1 970.493.8747 1 Fax: 970.493.5869 September 7, 2012 Karen McWilliams Preservation Planner City of Fort Collins Fort Collins, Colorado, 80521 Z ' archistructlon• A WWW.Oomn.com j l-� 1 ,i Subject: Alternative Compliance for Site Lighting @ Engines & Energy Conversion ; Laboratory. ++ Dear Karen: As you are aware, our project design team has resubmitted the Entitlement Package for the Engines & Energy Conversion Laboratory (EECL). This submittal is our second (and hopefully our final) round for review and approval. As part of this submittal we have included a request for an Alternative Compliance to Sec. 3.2.4(C)-Site Lighting Levels of the Fort Collins Land Use Code. I would like to present to you the reasons I am suggesting this solution for the EECL project. Our design team typically would select fixtures and calculate placement of light poles on the recommendations outlined in the Land Use Code but in this unique case we are suggesting a reduction in the light levels by approximately half based on the guidelines established by the Illuminating Engineering Society of North America (IESNA). These guidelines are widely accepted throughout cities in the U.S. The reason for our request is two -fold: 1'. The first concern is for the safety of the patrons who will use this site. Due to the close proximity to the river corridor, the bike path, and the possibility of unknown people crossing this site we strongly recommend to the City of Fort Collins, as the property owner, that the parking lot be lighted to this acceptable level at a minimum. c 2. Second, our design team is interested in reducing the impact of light poles and artificial light to the site as we discussed during our meetings with the Landmark Preservation Commission. The reduction of the overall light level allows the design to use shorter and fewer light poles thus p having less of an impact visually to the site and building. The team has as considered using short light bollards in place of taller poles but bollards J44* are not recommended for general parking lot lighting due to their �a �c r� 2620 E. Prospect Road, Suite 100 1 Fort Oollins, CO 80525 1 970.493,8747 1 Fax: 970,493.5869 CSU ENGINES AND ENERGY CONSERVATION LABORATORY Luminaire T e Luminaire Lumens XP1A 5,701 XP1C 2,880 XP4 2,880 XR1 450 XR3 653 XS5 346 XW1 1,298 XW1A 1,248 XW2 870 LUMINAIRE LUMENS 09/06/2012 Clanton & Associates, Inc. 4699 Nautilus Court South, #102 Boulder, CO 80301 light and glare control. All of the requirements in Section 3.2.4 Site Lighting (D) Design Standards are provided for with no variations. Specifically, the site lighting addresses each of the Design Standards as follows: • 3.2.4(D)(1) — Minimal site lighting has been provided for basic function and safety. No decorative lighting has been provided that could be confused with warning, emergency or traffic signals. • 3.2.4(D)(2) — All spaces have been designed to minimize obtrusive light across the property boundaries. Type 'XW1' wall mounted luminaires near the southern property line have a IES Type II distribution that directs light to the sides, with very little forward directed light to keep the light confined as much as possible to the driveway on the EECL site. Type 'XP1' pole mounted luminaires illuminate the parking lot with low wattage LEDs mounted on 16' poles. The pole height was reduced from typical parking lot lighting height of 25' to 16' to reduce the visual impact of lighting both off site and on the Historic Power Plant building. • 3.2.4(D)(3) —All light sources are fully shielded with low glare, spill -light control and mounted with non-adjustable brackets. • 3.2.4(D)(4) —The style of the light standards and fixtures are simple with little to no decorative feature. The basic forms, such as a shallow dome pole light and a wedge shaped wall mounted luminaire, blend into the surrounds without drawing attention to the lighting equipment, allowing the architecture to be the prominent feature. • 3.2.4(D)(5) — Low wattage LED luminaires provide low glare and control of unobtrusive light. • 3.2.4(D)(6) — Minimal lighting for basic security is provided for essential areas. All areas on the North and East sides of the building are illuminated only from fully shielded, wall mounted LED luminaires to minimize light spillage into the Poudre River Natural Resource Buffer. The parking lot and pathways on the West side of the building are illuminated with the fewest poles possible that still meet basic security requirements recommended by the IESNA. • 3.2.4(D)(7) — The maximum light level on the site does not exceed 10 footcandles. The maximum illuminance is 5.1 footcandles under the building entry canopies. • 3.2.4(D)(8) — Light levels along the South property line near the BNSF right-of-way falls to 0.1 footcandle at the property line. Along the North and East driveways, the lighting levels fall to 0.1 footcandle or lower at the edge of the driveways. • 3.2.4(D)(9) — There are no display lots for vehicle sales on this property. • 3.2.4(D)(10) — All LED luminaires are fully shielded with optics designed to distribute light precisely where it is needed. No exposed LEDs are used. 4699 Nautilus Court South, Suite 102, Boulder, CO 80301 Tel 303-530-7229 Fax 303-530-7227 IArea/Activity* Foot-candle Parking areas 1.0 Playgrounds 5.0 Under -canopy area (average maintained maximum) I 20.0 I Under -canopy area (initial installation maximum) 26.0 Description of need for Alternative Compliance Request The EECL project has a unique site location with multiple entities that must approve the site and exterior lighting. The City of Fort Collins and Colorado State University have lighting requirements that seek to provide a safe and secure facility while the Landmark Preservation Commission, and Natural Resources are most interested in preserving the historic and natural context of the site and its surrounds. The requirements and preferences of these different entities are in conflict. According to the City of Fort Collins Land Use Code Section 3.2.4 Site Lighting, a minimum of 1.0 footcandle is required for parking lots and building surrounds. Meanwhile, the Landmark Preservation Commission would prefer to see no light poles in the parking lot, and Natural Resources is seeking to minimize lighting equipment and light trespass in the Poudre River Natural Resource Buffer. To address both the concerns of safety and preservation, the EECL is requesting an alternative compliance for the Fort Collins Land Use Code Section 3.2.4 Site Lighting (C) Lighting Levels for Parking Lots and Building Surrounds minimum of 1.0 footcandle. As an alternative compliance the EECL project proposes that the lighting levels meet the following standards from the Illuminating Engineering Society of North America (IESNA). IESNA RP-20-98 Lighting for Parking Facilities Applies to - Parking Lots, Driveways Minimum Point Illuminance - 0.2 footcandles Maximum: Minimum Uniformity - 20:1 (basic security level) IESNA RP-33-99 Lighting for Exterior Environments Applies to - Pedestrian Areas, Pathways Average Illuminance - 0.5 —1.0 footcandles Maximum: Minimum Uniformity - 10:1 IESNA Lighting Handbook Ninth Edition Applies to - Building Entry Canopies Average Illuminance - 5.0 footcandles These proposed standards meet the intent of the Land Use Code to provide for safety and security while minimizing impact of light on neighboring properties and the natural environment. Visibility for safety and security is still maintained under lower light levels, and is improved by providing uniform 4699 Nautilus Court South, Suite 102, Boulder, CO 80301 Tel 303-530-7229 Fax 303-530-7227 CLANT t7C1ATES LIGHTING DESIGN AND ENGINEERING Request for Alternative Compliance for Section 3.2.4 (C) — Site Lighting Levels Engines and Energy Conservation Laboratory — Basic Development Review September 4, 2012 Concurrent with the Engines and Energy Conservation Laboratory (EECL) Expansion Basic Development Review, the project is requesting the following Alternative Compliance to the Fort Collins Land Use Code Section 3.2.4(C) concerning lighting levels for exterior site lighting. Current Standard 3.2.4(C) Lighting Levels. With the exception of lighting for public streets and private streets, all other project lighting used to illuminate buildings, parking lots, walkways, plazas or the landscape shall be evaluated during the development review process. The following chart gives minimum and, for under -canopy fueling areas, maximum lighting levels for outdoor facilities used at night. Area/Activity* Foot-candle Building surrounds (nonresidential) 1.0 Bikeways along roadside 0.9 Commercial areas i 0.6 I Intermediate areas 0.2 Residential areas Walkways along roadside 0.9 1 Commercial areas 0.6 Intermediate areas 0.5 Residential areas I Park walkways 0.5 Pedestrian stairways 0.3 Loading and unloading platforms 5.0 4699 Nautilus Court South, Suite 102, Boulder, CO 80301 Tel 303-530-7229 Fax 303-530-7227