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To view other documents please visit the WRDS Library online at: http://library.wrds.uwyo.edu Mailing Address: Water Resources Data System University of Wyoming, Dept 3943 1000 E University Avenue Laramie, WY 82071 Physical Address: Wyoming Hall, Room 249 University of Wyoming Laramie, WY 82071 Phone: (307) 766-6651 Fax: (307) 766-3785 Funding for WRDS and the creation of this electronic document was provided by the Wyoming Water Development Commission (http://wwdc.state.wy.us) III 111111111111111111111111111I11~llilllllllllllllllll 39092 05739124 7 lJt:--- PROPERTY OF n~~ Qj Water Resburces Data System Library ~ Wyo Hall 230 > ~ 'I -t: 307-766-6661 .~ i' ~ ~ t ~ (\:) ~ ~ I ~ = 1 I § ~ ~ ~ -=... 0 ~ ! ~ ~ ~ '--~ r~ "~ ~ f'I ·ff i~ ; J p"If rn "ACK NOBLITT & ASSOCIA YES 1920 Thomes Ave., Suite 620 Cheyenne. VWyo. 82001 (307) 634·9064 December 15, 1993 Mr. Michael K. Purcell, Director Wyoming Water Development Commission Herschler Building Cheyenne WY 82002 Dear Mr. Purcell, We are pleased to submit the report of the Level II Feasibility study for Water System Improvements at Laramie Regional Airport. The Feasibility Study was prepared in association with WRC Engineering, Inc., of Denver, Colorado. The Feasibility Study identified the fire flow requirements for the airport and developed several alternative means to provide the required flow. Based on an analysis of the costs and effectiveness of the alternatives, a preferred alternative was selected and a computer model of the performance of the system with the selected alternative was prepared. All work on this project by Jack Noblitt & Associates and by WRC Engineering, Inc., was performed by or under the immediate supervision of Professional Engineers licensed to practice in Wyoming. We wish to acknowledge the assistance provided by Mr. Evan Green, WWDC project Manager, as well as information and insights provided by the Laramie Regional Airport Board, Airport Manager Jack Skinner, Laramie city Engineer Bob Juve, Fire Chief Jim Noel, and Water Superintendent Wes Bressler. We appreciate the opportunity to have been able to provide this study. Please let us know if you need additional information on anything in this submittal. Sincerely, Jack L. Noblitt, P.E. Engineers. Planners Wyoming Water Development Commission LARAMIE REGIONAL AIRPORT WATER SYSTEM IMPROVEMENTS LEVEL II FEASIBILITY STUDY DECEMBER, 1993 Jack Noblitt & Associates, P.C. Cheyenne, Wyoming WRC Engineering, Inc. Denver, Colorado TABLE OF CONTENTS PAGE TABLE OF CONTENTS LIST OF TABLES ii LIST OF FIGURES iii I. INTRODUCTION 1 ll. EVALUATION OF FIRE FLOW REQUIREMENTS 2 m. EVALUATION OF EXISTING STORAGE, TRANSMISSION AND DISTRIBUTION SYSTEM 8 IV. EVALUATION OF ALTERNATIVES 10 v. CONCEPTUAL DESIGN 17 VI. ECONOMIC ANALYSIS/ABILITY TO PAY 18 VU. PERMITTING 20 vm. CONCLUSIONS AND RECOMMENDATIONS 21 APPENDIX A- COST ESTIMATES FOR ALTERNATIVES 1 THROUGH 8 10 pages APPENDIX B- LAYOlITS OF ALTERNATIVES 1 THROUGH 7 (FIGURES 3 THROUGH 9) 7 pages APPENDIX C- COMPUTER MODEL OUTPUf FOR THE SELECTED ALTERNATIVE 11 pages LIST OF TABLES PAGE TABLE -1 NEEDED FIRE FLOW CALCULATION 6 TABLE - 2 ALTERNATIVE COMPARISON MATRIX 12 TABLE - 3 ALTERNATIVE ANALYSIS - LOCATION OF MINIMUM PRESSURES 16 TABLE - 4 PONSOR'S ANNUAL PAYMENT OBLIGATION FOR VARIOUS COST SHARING FORMULAS AND INTEREST RATES 19 ii LIST OF FIGURES PAGE FIGURE -1 EXISTING BUILDINGS AT LARAMIE REGIONAL AIRPORT 3 FIGURE - 2 GENERALIZED COMPUTER MODEL OF EXISTING DISTRIBUTION SYSTEMS 11 FIGURE - 3 ALTERNATIVE NO.1 B.1 FIGURE - 4 ALTERNATIVE NO.2 B.2 FIGURE - S ALTERNATIVE NO.3 B.3 FIGURE - 6 ALTERNATIVE NO.4 B.4 FIGURE -7 ALTERNATIVE NO. S B.S FIGURE - 8 ALTERNATIVE NO.6 B.6 FIGURE - 9 ALTERNATIVE NO.7 B.7 FIGURE -10 WATER DISTRIBUTION SYSTEM MODEL (ALTERNATIVE 2) C.1 iii I. INTRODUCTION The Laramie Regional Airport is located approximately 4 miles west of Laramie. The airport obtains its water supply from the City's water distribution system. Water is transmitted to the airport through a 10-inch pipe. The capacity of the 100inch pipe is inadequate to supply water in sufficient quantity for fire fighting purposes. Further development at the airport has been restricted until adequate fire flows can be provided. In June, 1993, the Wyoming Water Development Commission contracted with Jack Noblitt and Associates, P.C. of Cheyenne, Wyoming, and its sub-consultant WRC Engineering, Inc. of Denver, Colorado to conduct to a Level II feasibility study of improving the water supply system serving the Laramie Regional Airport. The Scope of Services consisted of evaluating the fire flow requirements at the airport; evaluating the City's existing storage, transmission and distribution system to determine its capability to provide the recommended fire flow; evaluating alternatives and preparing alternative cost estimates; preparing an economic analysis and determining potential funding sources; determining permitting requirements. The purpose of the project was to determine a cost effective method of providing adequate fire flow to the Laramie Regional Airport that was in reasonable compliance with the City of Laramie's Water Supply Master Plan. The recommended fire flow for the Laramie Regional Airport is 4000 gallons per minute for a 4 hour duration. The fire flow was determined using data obtained from field observations and the methodologies contained in the Insurance Service Organization Fire Suppression Rating Schedule and the Uniform Fire Code. The Laramie Regional Airport is located in Zone 1 of the City's system. The existing storage, transmission and distribution system in Zone 1 was evaluated to determine if there was capacity to meet the fire flow requirement. It was concluded that there was adequate storage. However the existing 100inch pipe serving the airport is inadequate. Eight alternatives were developed that could supply the recommended fire flow to the airport. For each alternative, cost estimates were prepared and computer models were created to determine the impacts on the existing system. Alternative No 2A was recommended and accepted by the project sponsor and participants as the preferred alternative. The estimated cost of Alternative No. 2A is $2,058,000. The proposed improvements include a 1.0 million gallon storage tank, 12-inch and 16-inch pipeline, a booster pump and a fire pump. 1 ll. EVALUATION OF FIRE FLOW REQUIREMENTS A. GENERAL An evaluation of the existing types of construction and building uses at the Laramie Regional Airport (LRA) was conducted to determine fire flow requirements. The evaluation included site observations to determine the type of construction and current uses of the existing buildings, research of the City of Laramie Fire Ordinance, Insurance Services Office (ISO) Fire Suppression Rating Schedule, Specific Commercial Property Evaluations, 1991 Uniform Fire Code and calculation of the Needed Fire Flow for each of the existing buildings. B. DESCRIPTION OF EXISTING BUILDINGS There are currently 16 buildings at LRA. The uses of the buildings and types of construction are varied. Figure-l presents the location of the existing buildings and corresponding building number for cross referencing the following descriptions. 1. Building 1 - University of Wyoming Hangar The University of Wyoming Hangar is a pre-engineered metal building with a floor area of approximately 14,000 square feet (st). The building is used for aircraft storage and maintenance, machine shop, vehicle maintenance and office space. The structural members of the building are not protected. Framed partition wails with drywall are present. 2. Building 2 - Hangar 1 Hangar 1 is a masonry building with steel roof trusses and wood roof deck. The floor area is approximately 4,900 sf. The building has no heat or electric power and is currently not being used. The west side of the building is lined with rooms that were used as machine shops and paint rooms. The ~ side of the building used to be lined with offices. The office area has wood floors and framed partition walls. There are no plans to occupy the building due to the improvements needed to upgrade the building and building systems to conform to the current building codes. 3. Building 3 - Hangar 2 Hangar 2 is approximately 11,700 sf. Approximately one-half of the building is constructed with masonry walls, timber roof trusses and wood roof deck. The other one-half of the building is a pre-fabricated metal building. The building has no heat or electric power. The north side of the building is lined with storage rooms. Approximately one-third of the rooms have framed walls and ceilings with drywall. The building is currently used to store aircraft. There are no plans to occupy the building due to the improvements needed to conform to current building codes. 4. Building 4 - Cowboy Aviation (fB0) This building is wood framed with a stucco exterior. The floor area is approximately 1,500 sf. The building is used for offices. 2 \\ / ,'l 250 125 0 250 500 I I dCALE:1 N =25d. I ~~9 C'-_____LA_R_A_M_IE_R_E_G_IO_N_A_L_A_IR_P_O_R_T ____ ---') E~ 5. Building 5 - Garage This is a wood framed building used to store motor vehicles and small equipment. The floor area is approximately 1,300 sf. 6. Building 6 - Mobile Home This building is a double wide trailer used to house airport personnel. The floor area is approximately 1,400 sf. 7. Building 7 - Terminal Building The terminal building is a frame building with stone and brick sides, timber columns and beams and framed interior partitions. The floor area is approximately 8,400 sf. The building uses includes offices, passenger loading, car rentals, flight and airport operations 8. Building 8 - Aircraft Rescue and Fire Fighting (ARFf) Building The ARFF building is a pre-engineered metal building, with approximately 2,000 sf of floor area.