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HomeMy WebLinkAboutDraft For Review 02-23-2007`t HUGHES ASSOCIATES, INC. FIRE SCIENCE & ENGINEERING DRAFT FOR REVIEW February 23, 2007 Todd Johnston The Weitz Company One Willow Bridge Road 141 E Meadow Drive Suite B 171 -B Vail, CO 81657 RE: One Willow Bridge Road Garage Level Staging Criteria During TCO Dear Todd: 2 Garden Center, Suite 204, Broomfield, CO 80020 USA Phone 303 - 439 -0485 ■ FAX 303 - 439 -7160 ■ www.nainre.com At your request, Hughes Associates, Inc. (HAI) has evaluated the Garage Level of One Willow Bridge Road (OWBR) to determine acceptable staging configuration that is consistent with the hazard classification of the sprinkler system. This letter provides our findings and recommended limitations for construction storage for the building. Construction storage in the garage consists of the following: • Non - combustible materials (stone, tile, mortar, etc) • Easily ignited combustible materials (cardboard boxes) Ordinary combustible materials (wood) ■ Limited amount of plastic material It is understood that the wood storage is limited. However, during site delivery the amount of wood materials will increase temporarily until the material is distributed to the appropriate areas of the building. This temporary storage will not result in exceeding the design criteria of the sprinkler system as long as this increase in storage is consistent with the criteria addressed below. HAI also understands that a draft curtain will be provided between the construction staging area and other areas of the Garage. Based on the shop drawings from Frontier Fire Protection for OWBR, the sprinkler system is a dry system with a hydraulic design of 0.02 gpm/ft2 over 1950 square feet. Since a dry system requires a 30% increase in the design area, the comparative design is 0.02 gpm/ft2 over 1500 square feet. A sprinkler density of 0.02 gpm/ft2 provides an Ordinary Hazard group 2 designation. Based on NFPA 13 Section 5.3.2, Ordinary Hazard Group 2 occupancies are designed for occupancies where quantities and combustibility of contents are moderate to high, stockpiles do not exceed 12 feet, and fires with moderate to high rates of heat release are expected. Based on the existing sprinkler appropriate at the requested �s HAI believes that the following storag erstrictions are o ensureha sprinkle� tem is not overcome by a fire in the area. 1. Storage is to be in areas limited to 1500 square feet. It is understood that storage within these areas will be a mixture of combustible and non - combustible materials. 2. A 10 feet aisle is to be provided to separate the maximum 1500 square feet storage areas. 3. Storage is not to exceed 8 feet in height. Baltimore/Washington / Anchorage / Chicago I Cincinnati V Dallas / Denver I Minneapolis I New York a Oakdale I Orlando Philadelphia 1 Princeton I Providence g Sacramento g Sacramento I San Ramon / Scottsdale I West Lafayette Milan § Singapore § Seoul I Taipei Todd Johnston One Willow Bridge Road - Garage Level Staging Criteria During TCO page 2 of 2 February 23, 2007 4. Good housekeeping practices are to be implemented to minimize refuge, including empty cardboard boxes, throughout the area. Please contact me at 303 - 439 -0485 if you have any questions or comment. Thank you. Sincerely: Hughes Associates, Inc. Scott A. Craig, PE HUGHES ASSOCIATES, INC.