USEB132001_Mustang_Design Narrative.pdf

2018-08-21 Air National Guard Repair Water Mains and Roads 1

CIVIL ENGINEERING TYPE B-3 SERVICES SUBMITTAL

PROJECT # USEB132001

BASIS OF DESIGN

REPAIR WATER MAINS AND ROADS, MUSTANG LANE AND NORTH LOOP

SALT LAKE CITY, UTAH

DECEMBER 16, 2019

PROJECT DESCRIPTION

PROJECT TEAM

Owner Air National Guard Major Travis Johnson 801.245.2141

Civil Engineer Bowen Collins & Associates Kirk Bagley 801.495.2224

APPLICABLE CODES AND STANDARDS

Conform to the latest edition of the following codes and standards, or the requirements defined in this program, whichever is more restrictive:

• Air National Guard Design Policies, ANG ETL 15-01 & 15-01-01 thru 08

• Air National Guard Design Objectives and Procedures (Tab C)

• ANG ETL 11-12: Compliance with Handicapped Accessibility

• ANG ETL 12-05: Design and Construction Handbook

• ANG ETL 16-03: Design Meeting and Presentations

• ANG ETL 12-07: Preparation of Project Documentation Package

• ANGH 32-1084 ANG Standard Facility Requirements

• DoD Federal Facility Criteria

• AFI 32-1054 Corrosion Control

• UFC 1-200-01 DoD Building Code (General Building Requirements)

• UFC 3-600-01 Fire Protection Engineering for Facilities

• UFC 4-010-01 DoD Minimum Antiterrorism Standards for Buildings, with Change 1

• UFC 4-010-02 DoD Minimum Antiterrorism Standoff Distances for Buildings (FOUO)

• UFC 4-020-01 DoD Security Engineering Facilities Planning Manual

• UFC 4-211-01 Aircraft Maintenance Hangars

• UFC 3-230-01 Water Storage, Distribution, and Transmission, with Change 2

• UFC 3-230-02 O&M: Water Supply Systems

BACKGROUND

Since the 1950’s when the original cast iron (CI) water line was installed along Mustang Lane and the North Loop, there have been a number of water leaks requiring the lines to be repaired. In an effort to mitigate these untimely repairs the water line will be replaced with a new polyvinyl chloride (PVC) water main.

Undersized PVC lines will also be replaced and inadequate redundancy will be also be addressed.

The existing roadway is also in disrepair and will require replacement. Both asphalt and concrete pavement will be replaced, along with the associated sidewalks, curbs, gutters, and adjacent parking lots.

The intent for this project is to replace all CI water lines, roadways and appurtenances to improve the performance of the water system and roadways on the base.

This project is classified as ANG Category of Work, horizontal construction, with a sustainable design goal of ANG Meritable. The project will not be registered with the U.S. Green Building Council under the 2009 version (LEED v3) and will not obtain USGBC LEED recognition.

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WATER LINE IMPROVEMENTS

The water main will be replaced starting from the ownership transition point between Salt Lake City and Utah ANG and extend along Mustang Lane to an existing location where Utah ANG has previously installed PVC pipe. All cast iron laterals between the replaced water mains shall be replaced. Undersized and inadequate PVC lines will also be replaced. All existing cast iron lateral connections for services, and other water, sprinkler irrigation or fire lines will be replaced in such a way that the connection will be new at the main and spliced into the existing lines. New pipe connection sizes will match the existing pipe sizes, unless the hydraulic modeling indicates otherwise. A figure of the water mains and the anticipated laterals are shown on Attachment 4 (See Tab C) provided by Utah ANG.

All connection point locations to the existing main lines will be confirmed during design where possible. The extent of lateral line replacement will be confirmed during the design and if determined to be in poor condition, will be replaced up to the building. The water service laterals for Buildings 19 and 7 shall also be replaced, as well as the valve for Building 10. A sufficient number of gate valves have been provided in the design so that a combined total of 5 hydrants or laterals to no more than three separate buildings are out of service due to a single break.

New waterlines will be C900 DR-18 PVC, except in areas with contaminated soil/water. In contaminated areas designated on the design plans, new waterlines will be Class-52 ductile iron pipe with nitrite gaskets and wrapped in corrosion blankets and Denso tape.

A water model was developed to address domestic and fire flow demands for all facilities on the base and includes estimated future demands for future hangars north of Building 23 and the replacement of Building

150. Building 7 is a warehouse and requires fire sprinklers according to UFC 3-600-01. The model was calibrated with pressures for various flows provided by the Salt Lake Department of Public Utilities (SLDPU).

Recommendations for upgrading the water system are based upon model results.

After meeting with SLCDPU and based on the model results, we propose making two new connections with the City’s water main on 2200 West by installing a new 8-inch meter at the north end of the complex, and another new 8-inch meter placed just outside the gate on 700 North (as part of the Patriot Way project).

We also recommend adding an 8-inch detector check valve just outside the gate on the south end of Mustang Lane. This would allow the elimination of all other existing meters on the base. The location of the water meter on the north side of the base and the detector check valve allows fire flows to come from both ends of the base and helps alleviate some problems of high fire flow velocities, as well as provide looping and redundancy to the system.

The existing 6-inch line along Mustang Lane will be upgraded to an 8-inch PVC pipe, as well as the laterals connecting between Mustang Lane and Sabre Street mains. The proposed water line sizes keep the fire flow velocities less than 10 feet per second. For a detailed report and figures of the water model analysis, see Tab F in the Appendix.

There are various locations where the new water line may not be directly in the road or passes under existing parking or other areas. In these locations, the existing landscaping or paving will be replaced to match the existing conditions.

As a general rule, existing fire hydrants connecting to existing water lines will be removed. New hydrants will be installed connecting to the new water main and located to best suit the base operations and to meet International Fire Code and UFC requirements. The water model of the base was coordinated with Salt Lake City to obtain existing pressures at the existing meters and calibrated to match Salt Lake City’s water model. Upon completion of the water main installation, the contractor will be required to obtain flow tests to be used to verify calibration of the water model.

A topographic survey of the waterlines has been performed after blue stakes was completed to locate all existing water lines and other utilities for use in the design of the new water main. All existing water lines

2018-08-21 Air National Guard Repair Water Mains and Roads 3 and other utilities encountered in the surveying of the site shall be used to update the ANG base AutoCAD and GIS Common Installation Picture (CIP) base maps.

A geotechnical investigation was performed to obtain soil borings for the purpose of recommending pipe bedding and backfill requirements, and provide testing results and analysis for the site. The report provides recommendations on cathodic protection requirements as noted in AFI 32-1054.

A unidirectional flushing plan for the entire base water system has been designed to maximize the flushing process by sequencing the opening and closing of valves to force the water through designated hydrants with sufficient scour velocity. Existing valve locations were verified prior to design. The flushing plan conforms to requirements detailed in UFC 3-230-02 7.3.2.2.

ROADWAY IMPROVEMENTS

With the installation of the waterline, the roadway will also be replaced as shown on Attachment 4 (See Tab C) provided by Utah ANG. The asphalt pavement and concrete pavement drive surfaces will be replaced in their entirety on roads adjacent to the water line alignments including sidewalks, curbs, gutters, and parking lots adjacent to the roads. Asphalt and concrete pavement thickness and base course thickness recommendations are provided in the geotechnical investigation report. All parking lots will be designed to meet the site security requirements and all adjacent areas re-graded with landscaping improvements. Grass strips will be removed in some areas and replaced with wider sidewalks, while other grass landscaped areas will be replaced with rock mulch.

All roadways and parking lots have been designed to meet current AT/FP requirements. More meaningful segregation between the flightline and non-flightline areas will be accomplished by modifying the parking lot in front of Building 10 to include a fence around the parking stalls to provide a barrier and separation from the flightline. In addition, the flight line fence between Hangars 3 and 40 shall be relocated from the west end of the buildings further east to the middle of Hangar 3. A fence will also be added between Buildings 40 and 19 with a gate at the west end of 800 North and a gate on the north end of the Mustang Lane/800 North intersection.

STORM DRAIN IMPROVEMENTS

Storm drain inlets will be replaced as part of the project. The roads, gutters and waterways will be graded to allow for better drainage on site. Several additional new catch basins were added as necessary to work with the design road grades. Additional site storm drain system improvements are not anticipated to be modified or updated with this project. In the event that storm water piping or facilities are impacted by the installation of new water lines, the storm water may be modified, with storm lines being replaced to match existing sizes.

CORROSION PROTECTION

Table 1 of the geotechnical report (see Appendix 6) presents laboratory results for corrosivity tests performed on the four boring samples. The resistivity ranged from 769 to 3,180 ohm-cm. AFI32-1054 Section 4.1.5 requires cathodic protection and protective coatings for buried utilities where soil resistivity is below 10,000 ohm-centimeters. As the proposed pipe is PVC, anodes will be placed at connections to existing metallic pipes or at ductile fittings and wrapped in protective coatings. Anodes will also be added to new fire hydrants and valve bodies. Buried pipe fittings will be equipped with stainless steel bolts.

PAVEMENT RECOMMENDATIONS

The soil conditions generally consisted of a topsoil, concrete pavement or asphalt pavement at the ground surface, with the pavement sections being underlain by 7-inches of aggregate base. Approximately 3 feet of fill material was observed at one location. Below the pavement and fill layers, soils consisted primarily of soft to medium stiff sandy clay to lean clay with sand with occasional loose to medium dense silty to

2018-08-21 Air National Guard Repair Water Mains and Roads 4 clayey sand layers ranging in thickness from 2 to 6 feet. Groundwater levels were detected between 7 and 10 feet below ground surface (bgs).

The report recommends an asphalt thickness of 4 inches and untreated base course thickness of 6 inches for asphalt pavement design. With regards to Portland cement concrete (PCC) design, the PCC pavement thickness should be 6 inches of unreinforced concrete for the assumed traffic loadings and 6 inches of untreated base course material.

With regards to subgrade preparation, the report recommends a stripping depth of 7 inches in pavement areas. The subgrade should be proofrolled using a loaded 2 water truck or 10-wheel dump truck to identify areas of instability. Areas identified as soft or yielding should be either re-worked and re-compacted to an unyielding condition, stabilized using chemical treatment, or over-excavated to a firm and unyielding subgrade. Over excavated areas should be replaced with stabilization fill and placed on reinforcement fabric such as Mirafi 500X.

UTILITY TRENCHING

Unshored utility trench excavations must be excavated at a 1.5H:1V slope or flatter. Pipe bedding material is expected to be import material and should conform to, be placed, and compacted according to the pipe manufacturer’s recommendations. Trench backfill is expected to be native material and should be placed and compacted using mechanical compaction methods.

FIRE SYSTEMS ANALYSIS

The fire flow analysis began by assigning fire flow demands to each building based upon International Fire Code (IFC) criteria. Buildings that were equipped with fire suppression systems require a much smaller fire flow demand than those without such systems. Estimated fire flow demands can be found in Table A4 of the water model report in Appendix 7.

UFC 3-600-01 Section 9-3.5.8.1 requires that no more than 1,250 gpm is allowed per fire hydrant. In addition, 9-3.5.8.2 states the entire exterior wall of each building must be within 350 ft of a hydrant. All the buildings along the waterlines being replaced in this project meet this requirement.

Section 9-3.5.8.4 states that hydrants protecting warehouses must be spaced at 300 feet maximum intervals. A fire hydrant on the west side of Building 7 was added to meet this requirement. 9-3.5.8.4 also states that at least one hydrant must be within 150 feet of the fire department connection. All buildings in this project meet this requirement.

UFC 4-211-01 Section 3-6.3.2 states that one hydrant must be located within at least 100 feet of each corner of the hangar. To meet this requirement, a new hydrant is proposed to be placed between Buildings 3 and 40 on the east side and west side. Two more hydrants will also be placed east and west of Building

19. To comply with 3-6.3.2, low profile, conventional hydrants no taller than 2.5 feet will installed where they are within 25 feet of airfield pavement. Figure 1 illustrates these hydrant distances.

Based upon the analysis of the model with the upgrades to the existing domestic water system, the fire flow demands of the base can be met without the need of water storage. Water storage for hangars and other high demand buildings may be eliminated.

SUSTAINABLE DESIGN SCORESHEET

The scope of work states that the project is categorized as horizontal construction with a sustainable design goal of ANG Meritable. ETL 15-01-01 Section 9.3.1 states that the minimum number of points for this type of construction is 9 points. Attachment 3 of the same ETL lists the elements typically used to achieve points for projects of this category. Of those elements the following are what are believed to be possible for this project and descriptions can be found in Appendix 5.

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LEED Credit Element Points SS Credit 1: Site Selection 1 WE Credit 1: Water Efficient Landscaping/Option 2 4 MR Credit 2:Construction Waste Management 1-2 MR Credit 4: Recycled Content 1-2 MR Credit 5: Regional Materials 1-2

SS Credit 1 and WE Credit 1 will both be achieve the points shown above as the project is currently designed. The remaining three items can achieve the points shown if appropriate requirements are written into the specifications directing the contractor to do the following: recycle demolished asphalt and concrete pavement, use asphalt concrete and base course containing recycled material, and use local materials. See Appendix 5 for specific requirements.

AT/FP ANALYSIS

In accordance with the most recent release of UFC 4-010-01 Section 3-2, parking lots and roadways adjacent to existing buildings within an installation perimeter are exempt from standoff distances. Therefore, the existing parking lots will be repaved and remain where they are currently located.

PERMITS

A permit will need to be obtained in order to construct the waterline canal crossing. The canal is called the City Drain West Branch and belongs to Salt Lake County and permitting will done through them.

OTHER REQUIREMENTS OF THE SOQ

Additional information regarding any environmental or other fact-finding investigations such as permitting (federal, state, and local requirements for air, water and waste), user requirements, economic feasibility study and value engineering proposals may be provided as necessary. Permitting of the water line will not be required by the State of Utah due to it being a replacement of an existing line. Coordination with Salt Lake City will be done to meet their requirements.

A construction cost estimate will be developed in accordance with ANGETL 10-03 Section1.3.2., showing subtotals for each division and a grand total for the project. A listing of ABIs or Options will also be included.

No information pertaining to the cost estimate will be disclosed except to the extent permitted by the Contracting Officer.

An ANG Sustainable Design and Energy Conservation Score Sheet accompanies this narrative along with any required preliminary energy modeling results as contained in the Energy Conservation section of the score sheet.

Technical specifications are provided in Word format on a CD for review by the ANG and to the contractor for construction. The submittal benchmarks include Type A1, A2, B1, B2 and B3 services.

The submittal benchmarks include Type A2, B1, B2 and B3 services. All review comments from the B2 submission have been addressed and design drawings will be provided to ANG in AutoCAD format.