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HomeMy WebLinkAboutApp G Fire Flow Road Design PRE15-00030 (2)Thomas L. Aumock Consulting Fire Code Inspector & Plans Examiner Jefferson County Department of Community Development 2303 Hendricks Street, Port Townsend, WA 98368 (360) 385-3938 Email: taamock@cablesceed.com Cell : (360)643-0272 PLAN REVIEW MEMORANDUM TO: Joel Petersen, Associate Planner, Jefferson County D.C.D. / FR: Thomas L. Aumock, Consulting Fire Code Inspector & Plans Examine DT: 23 October 2015 RE: PRE15-030: Delaware West Companies, LLC regarding a proposed Transient Cabin/Treehouse Rentals This consulting Fire Code Inspector and Plans Examiner to Jefferson County is in receipt of the Pre -App information for the above -referenced proposal from your office. It is understood that the project site is not within a formal Fire District. Preliminary fire flow availability review for this proposal is derived from the requirements of the Jefferson County Coordinated Water System Plan, and Jefferson County Department of Community Development policy and practice. It is understood that the existing water service for the area amounts to a well that pumps 36 gallons per minute. The Jefferson County Coordinated Water System Plan classifies this proposal as "Rural' and per W.A.C. 246-293-060 "Minimum Standards For Fire Flow", the rural classification does not require fire flow. However, for the purposes of examining a fire flow for this proposal, the use of the Insurance Services Organization [LS.O.] standards, and portions ofNFPA 1142 "Water Supplies for Suburban and Rural Fire Fighting" are used. The single largest structure [cabin] is approximately 500 square feet of "fire area" as defined by the 2012 International Fire Code. of Fire Area]" = Fire Flow in Gallons Pet Minute [g.p.m.] @ 20 psi residual 27[22.4]= 605 g.p.m. @ 20 psi residual The base calculated fire flow requirement = 391 g.p.m. after credit is includedfor low -hazard use, and] -hour construction upgrade, and a debit for proximity to other cabins and1or tree -houses. To assist in any planning for a water -storage reservoir for fire protection, the following is provided: NFPA 1142 Volumetric Fire Flow Reauirement for the single largest structure Fire area = 500 ft' with 250 R' attic = 750 fl [assumed 4:12 pitch] Wall Height = 9 ft height [assumed] Total volume = [8] [750] — 6000 ft The NFPA 1142 occupancy hazard classification number is 5 and the construction classification number is 1.5 resulting in the following calculations: 6 000 5 [ 1.5] = 1,800 gallons of water for the largest single structure proposed. The preliminary minimum calculated total water supply equals 1,800 gallons of water to extinguish a cabin fire and to supply exposure protection. This does not include any amount necessary for continuation of any domestic water supply for remaining structures being serviced by the well. If one factors the 36 gallon -per -minute recharge rate over one-hour flow duration normally required, this amounts to a recharge of 2,160 gallons to the reservoir. It is recommended that the proponent also consider a dry standpipe from the reservoir to provide a fire agency tender refill connection, if available from a suggested "mutual aid contract' with the nearest agency. Otherwise, pre -connected hose[s] could be considered to provide on-site fire protection. An automatic fire suppression system (sprinklers) can be analyzed for each structure by a licensed consultant to determine whether the existing well could support such a system, for the purpose of assisting in life and fire safety planning, and for fire insurance purposes. Road access shall meet or exceed the current Jefferson County Private Road Standards for the main access roads. [Copy attached] All units shall be provided automatic smoke detection appliance[s] and fire extinguishers. 1.0 hour of time was logged in the review, report preparation, and submittal, for this proposal • Building Permit Number • Proponent • Fire District & Tender Credit • Address • Parcel Number • Fire Area Calculation [A] I.S.O. FIRE FLOW CALCULATION WORKSHEET n�/i-0-10 �1AW.4tl w,&;r IJ.s -zel, _ Tender Credit GPM f}PN y/?273002 Base `5-00 Exterior Overhangs, Etc. /yc. • I.B.C. Construction Type • I.S.O. Construction Coetrrcient [C] /•'Jr • Total Fire Flow from ISO Formula: 18 C[A10.5=[F]W,H91 181 Z f I [ 10.5 = Base Fire Flow GPM IF] ri?-1 r 2z,v I_ (0O5 SF SF Square Ft. Total 5"CU [Type A factored as 1 -hour below] Base Fire Flow GPM FG24 Debits or Credits [H] • I.S.O. Occupancy Hazard [ 15�f Low [-25%] ❑ High [+25%] Adj. GPM 40��g • I.S.O. Exposures Debit or Credit o/stancelrype Debitforcredal % <30'add 20% Nord? One -Hour Construction V GWS 31-60' add 15% South Jw 61400 add 10% East Factored 0 SFDist.Foe Flow Capacity X Equals Maximum Fire Area Separation Allowed 101-150add5% West Largest Proposed Area Separation in SF Pe -F-1 >150'subbad25% Other Actuated Base Debit, or Credit �Af % Fire Flow GPM ri ZZ • Sprinklers Credit ❑ deducto.75% IMoh,1ybyo.251 Adj. GPM • One -Hour Construction Credit IRdetluct0.25% [MUMplybya751 Adj. GPM 39/ • Required Total Fire Flow Requrement [But not less than 500 GPM] Required GPM • Design Change Credits Type Adjustment Change in Exposure Rating ❑ SprinMers❑ One -Hour Construction V GWS Area Separation Calculation❑ Largest Sbucture Fire Area: Adjusted Base Fire Flow - Factored 0 SFDist.Foe Flow Capacity X Equals Maximum Fire Area Separation Allowed Square Feet Max. Largest Proposed Area Separation in SF Pe -F-1 Other❑ r Plans Examiner Date Fall[] Adj. Required GPM Jefferson County Department of Community Development 621 Sheridan Street, Port Townsend, WA 98368 (360)379-4452 Fax: (360) 3794451 NON-PUBLIC ROAD/DRIVEWAY DESIGN AND CONSTRUCTION STANDARDS Dated: February 2015 Standards 2012 Edition of the International Fire Code [LF.C.], Chapter 5, Section 503 "Fire Apparatus Access Roads", and I.F.C. Appendix D. [Guideline only, not adopted as Code by the State] American Association of State Highway and Transportation Officials [AASHTO] Washington State Department of Transportations [W.S.D.O.T.] Less than 100 average daily traffic volume [A.D.T.] Purpose To assist property owners with responsible design and construction standards for their Fire and Sheriff Department's efficient delivery of emergency services to the subject property[s], as well as other services. Scope The scope of this policy is for emergency services access provision on private properties and privately constructed and maintained roadways in public rights of way to at least 150 feet of a significant structure as measured from the rear of that structure. This means a fire track can park, and deploy firefighters with 150 -foot length fire hose from each side of the structure, and meet in the back, but without obstructions. Standards A travel surface should be constructed and maintained according to these standards: • All materials should meet WSDOT standard specifications for road construction • Twenty [20] foot minimum unobstructed width with the following elements Minimum finished driving surface width of twelve [12] feet should be provided, and maintained. 0 Four [4] foot shoulder ---each side—is recommended in sloped landscapes, as shoulders provide lateral support of elevated roadway surfaces and provide an "operations zone" around parked emergency services vehicles on the roadway. 0 Brash should not impede the sides of the travel surface to a height of 14 feet Minimum 6 -inch ballast or gravel base, which may need to be increased depending upon the suitability of native material, with 2- inch minimum depth of compacted crushed surfacing top course 2 percent crown slope at the centerline Compaction of the material to a load capacity of 75,000 pounds Cut and fill slopes, including ditches, should be designed to provide 2:1 slope gradient Q\Users\jcelpWppDau\LacaM1icrosoa\Window \Temporary Internet Fi1es\Con1ent0utlook\7KELKB0Veff Co Private Road Design SI .doe 10/23115 • Any curvature and departures in the roadway should have a minimum 28-foot radius (internal measurement). Apron radii may be located within the existing public way provided the public paved surface width accommodates same • Maximum grade is 12%, with greater than 12% requiring Fire District approval and/or shall be paved • Gradient change/transitions should be limited to seven [7] percent or less, to accommodate the wheelbase of the fire trucks and the body frame beyond the rear axle • Driveway approach to any constructed roadway should meet and approved 75 degree to 105 degree approach angle, to include brush clearance for line of sight at any "stop and yield' controlled intersection with a constructed public road, and include an approved paved apron • Brush and landscaping clear width should be fourteen [14] horizontally and vertically • An approved address sign with minimum 5-inch numbers should be posted where the driveway intersects with public roadway • Gates and fences on the roadway are obstacles to efficient emergency services delivery, and create width constrictions. Any such assemblies shall be eleven [I 1] feet in opening width, and should not be locked unless an approved lock-box system is installed • Driveway turnarounds for roadways over 250 feet in length should be provided, and should he designed consistent with the standards from the 2012 International Fire Code, Appendix D • Where private roadways are greater than 1,000 feet, owners should provide intermediate tumout[s], and should provide a formal off-highway turnaround at the road entrance to allow vehicles to turnaround without having to back-out onto the public right of way A recorded document should be executed in cases where property is served over a roadway easement. Such document prescribes the necessary ingress/egress provisions required by these standards, and most importantly, should include a maintenance agreement This includes multiple-party use of an access. TLA C:\Usem\joelp\ ppData\Locel\Microsoft\Windows\Temporary Internet Files\Cont t.OWIook\9PCELKBOUeff Co Private Road Design St& doc lonan5 Jefferson County Department of Community Development 621 Sheridan Street, Port Townsend, WA 98368 (360)379-4452 Fax: (360) 379-4451 NON-PUBLIC ROAD/DRIVEWAY DESIGN AND CONSTRUCTION STANDARDS Dated: February 2015 Standards 2012 Edition of the International Fire Code [I.F.C.], Chapter 5, Section 503 "Fire Apparatus Access Roads", and I.F.C. Appendix D. [Guideline only, not adopted as Code by the State] American Association of State Highway and Transportation Officials [AASHTO] Washington State Department of Transportations [W.S.D.O.T.] Less than 100 average daily traffic volume [A.D.T.] Purpose To assist property owners with responsible design and construction standards for their Fire and Sheriff Department's efficient delivery of emergency services to the subject property[s], as well as other services. SCODe The scope of this policy is for emergency services access provision on private properties and privately constructed and maintained roadways in public rights of way to at least 150 feet of a significant structure as measured from the rear of that structure. This means a fire truck can park, and deploy firefighters with 150 -foot length fire hose from each side of the structure, and meet in the back, but without obstructions. Standards A travel surface should be constructed and maintained according to these standards: All materials should meet WSDOT standard specifications for road construction Twenty [20] foot minimum unobstructed width with the following elements / Minimum finished driving surface width of twelve [12] feet should be provided, and maintained. / Four [4] foot shoulder—each side—is recommended in sloped landscapes, as shoulders provide lateral support of elevated roadway surfaces and provide an `operations zone" around parked emergency services vehicles on the roadway. 1 Brush should not impede the sides of the travel surface to a height of 14 feet Minimum 6 -inch ballast or gravel base, which may need to be increased depending upon the suitability of native material, with 2- inch minimum depth of compacted crushed surfacing top course 2 percent crown slope at the centerline Compaction of the material to a load capacity of 75,000 pounds Cut and fill slopes, including ditches, should be designed to provide 2:1 slope gradient C:\Users\DcMWcum ts\Bwiness\County Contrast\P01icy & PublicarionsVeti Co. Private Road Design Stds. dos 1023115 • Any curvature and departures in the roadway should have a minimum 28-foot radius (internal measurement). Apron mdii may be located within the existing public way provided the public paved surface width accommodates same • Maximum grade is 12%, with greater than 12% requiring Fire District approval and/or shall be paved • Gradient change/transitions should be limited to seven [7] percent or less, to accommodate the wheelbase of the fire trucks and the body frame beyond the rear axle • Driveway approach to any constructed roadway should meet and approved 75 degree to 105 degree approach angle, to include brash clearance for line of sight at any "stop and yield" controlled intersection with a constructed public road, and include an approved paved apron • Bmsh and landscaping clear width should be fourteen [14] horizontally and vertically • An approved address sign with minimum 5-inch numbers should be posted where the driveway intersects with public roadway • Gates and fences on the roadway are obstacles to efficient emergency services delivery, and create width constrictions. Any such assemblies shall be eleven [11] feet in opening width, and should not be locked unless an approved lock-box system is installed • Driveway turnarounds for roadways over 250 feet in length should be provided, and should be designed consistent with the standards from the 2012 International Fire Code, Appendix D • Where private roadways are greater than 1,000 feet, owners should provide intermediate tumom[s], and should provide a formal off-highway turnaround at the road entrance to allow vehicles to turnaround without having to back-out onto the public right of way A recorded document should be executed in cases where property is served over a roadway easement. Such document prescribes the necessary ingress/egmss provisions required by these standards, and most importantly, should include a maintenance agreement This includes multiple-party use of an access. TLA c kuse,st uvtaeamentauiusi.ss Counry Coauwwali, a Publia tuansvetP. Ca. Private Road Design 5tds..doc 10/23/15