USEB132009_Sabre Street_Design Narrative.pdf

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CIVIL ENGINEERING TYPE B-3 SERVICES SUBMITTAL

PROJECT # USEB 132009

BASIS OF DESIGN

REPAIR WATER MAINS AND ROADS, SABRE STREET

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

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

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

BACKGROUND

Since the 1950’s when the original cast iron (CI) water line was installed along Sabre Street, 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.

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, which is typically after the meter, and extend along Sabre Street near 860 North where Utah ANG has previously installed PVC pipe. All existing 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. New waterlines will be C900 DR-18 PVC. 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 within 5 feet of the building. 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. The one existing meter located in the scope of this project will be removed and replaced with a new meter which will be located, described and installed as part of the Patriot Way Waterline Project.

A water model was developed to address domestic and fire flow demands for all facilities on the base.

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. Due to velocities during fire flow conditions, all 6 inch water service mains and laterals will be upsized to 8 inch. 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.

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 requirements. Additional fire hydrants will also be installed if the spacing requirements require it. All new hydrants will meet the current standard requirements. The water model of the base was coordinated with Salt Lake City to obtain pressures at the existing meters and calibrate 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 was performed after blue stakes had been completed to locate all existing water lines and other utilities for use in the design of the new water main. All existing water lines 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. The purpose will be to provide an accurate mapping of the existing features georeferenced into the ANG existing mapping.

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

ROADWAY IMPROVEMENTS

With the installation of the waterline, the roadway will also be replaced as shown on Attachment 5 (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. The parking lot repairs 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. In one location south of Building 1522 and 218, the road will be replaced with turf sod and irrigation.

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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.

Street parking for building 220 is not expected to be replaced with the improvements to the road. It is our understanding that this building meets AT/FP requirements.

Asphalt and concrete pavement thickness and base course thickness recommendations are provided in the geotechnical investigation for the project.

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 of the site. 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.

The intersection between buildings 210 and 220 is a known area for poor storm water drainage. This area will be re-graded to provide positive drainage to the existing storm drain system. A new catch basin will also be installed at the northeast corner of this intersection.

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 1,370 to 3,140 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 or asphalt of 4 to 5 inches, underlain by approximately 8 inches of silty sand or sandy silt with gravel. Groundwater levels were detected between 8 and 10 feet below ground surface (bgs). Below the fill layer, soils consisted primarily of clayey sand or silty sand to approximately 4.5 feet bgs. Lean clay was encountered from approximately 4.5 bgs to 15 bgs where soils transitioned to well-graded sand.

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 5.5 inches 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 6 inches in pavement areas. The subgrade should be scarified and recompacted to a minimum depth of 8 inches.

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.

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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 300 ft of a hydrant. All buildings within the scope of this project meet these requirements. 9-3.5.8.4 also states that hydrants protecting warehouses must be spaced at 300 feet maximum intervals. A fire hydrant on the east 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.

Figure 1 illustrates these 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 a 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.

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.

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.

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A construction cost estimate has been 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 A2, B1, B2 and B3 services. All review comments from the B2 submission have been addressed and final design drawings will be provided to ANG in AutoCAD format.