Gibb Wash SOW.pdf

Statement of Work Gibb Wash Bridge Replacement

Coronado National Forest

1.0 Scope of Work

Bridge replacement work consists of the removal of an existing 24’ long, single-lane timber bridge and the installation of a 28’-1” span, 9’-6” rise, and 28’ long steel structural plate arch with welded wire headwalls. Additional work includes embankment construction with mechanically stabilized earth (MSE) wall, realignment of 550 feet of approach road, installation of a 24” diameter CMP culvert, installation of guardrails, reconstruction of stream channel, and obliteration of the existing approach road.

2.0 Background

The Gibb Wash bridge is located approximately 20 miles northeast of Tucson Arizona, on National Forest System Road (NFSR) 38, also known as Control Road, on the Santa Catalina Ranger District, Coronado National Forest, Pinal County, AZ, Township 11S, Section 15, Range 16E. The estimated construction date of Gibb Wash Bridge is around 1950. Many modifications have occurred since the construction including a running board replacement in the early 1990s and the bridge deck and guardrail installed in 2000. Additional work including the installation of a concrete and steel center pier and wooden backwalls on the abutments.

3.0 Technical Requirements

3.1 Construction shall adhere to codes, regulations, standards, and guidelines from:

• Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects, U.S. Customary Units” publication FP-14, 2014 Edition. FP-14 is available on the internet at https://flh.fhwa.dot.gov/resources/specs/

• Gibb Wash Bridge Replacement - Forest Service Supplemental Specifications (FSSS)

• American Association of Highway and Transportation Officials (AASHTO) Load and

Resistance Factor Design (LRFD) Bridge Design Specifications

• American Concrete Institute (ACI) - Manual 318

• American Society for Testing and Materials (ASTM)

• Standardized Specifications for Paints and Coatings (SSPC)

• American National Standards Institute (ANSI)

• Occupational Health and Safety Administration (OSHA)

• Manual of Uniform Traffic Control Devices (MUTCD)

3.2 Traffic Control

The project is divided into four consecutive phases, each requiring different traffic control measures. The phases and associated traffic control measures are detailed on Sheet C-03 of the Gibb Wash Bridge Replacement Plans. Full road closure will only be permitted for four consecutive days. The COR must be notified 10 days in advance of the road closure period.

All traffic control measures must adhere to MUTCD guidance.

3.3 Staging Area

The contractor shall store equipment and stockpiled materials within the designated staging area, see Page 4. This area will also be flagged by the COR.

3.4 Road Surfacing Aggregate

The Gibb Wash Bridge Replacement Plans call for Grade G surfacing aggregate, see Table 703-3 of the FSSS. Aggregate of this gradation may be considered a specialty or blended product and may not be readily available through commercial sources. The contractor shall have the option of producing Grade G surfacing aggregate using material available at an undeveloped aggregate pit two miles from the project site, see Page 5 for a map of the pit location relative to the project site. Aggregate obtained from the USFS aggregate pit will require testing to ensure that it meets the Grade G specifications.

4.0 Government Furnished

• Gibb Wash Bridge Replacement Plans. June 2021.

• Gibb Wash Bridge Replacement Forest Service Supplemental Specifications. June 2021.

• Four surveyed control points, see Sheet C-04 of the Gibb Wash Bridge Replacement Plans.

5.0 Deliverables / Schedule:

A pre-construction meeting is required. A schedule for all work must be submitted to and approved by the Government prior to construction beginning. In stream work shall be limited to between October 1st and June 15th. Allow 10 days for the review of deliverables. The required submittals shall include, but are not limited to, the following:

Item No. Deliverable Reference

1 Schedule FAR: 52.236.15 2 As-Built Plans FP-14: 104.03(c) 3 Contractor Weed-Free Material Sources Certification FSSS: 105.02(c) 4 Material Certifications FP-14: 106.04 -.06 5 Permits and Agreements FP-14: 107.01 6 (SPCC) Plan or Hazardous Spill Plan FP-14: 107.10(b)

Item No. Deliverable Reference

7 Certified Delivery Records of Items Weighed for Payment FP-14: 109.04 8 As-Staked Data and Corrections FP-14: 152.04 9 Contractor’s Quality Control Qualifications FP-14: 153.02 10 Contractor Quality Control Plan FP-14: 153.03 11 Traffic Control Plan & Temporary Closure Notice FSSS: 156.03 & .05 12 Soil Erosion & Sediment Control Measures Plan FSSS: 157.04 13 Erosion and Sediment Control Measure Inspections FP-14: 157.14 14 Sampling, Testing, & Compaction Results FP-14: 204.15 15 Slope, Cofferdam Design FP-14: 208.03 16 Dewatering Plans FP-14: 208.07 17 Sampling, Testing, & Compaction Results FP-14: 209.10 18 Installation Drawings FP-14: 255.03 19 Material Certifications FP-14: 255.06 20 Aggregate Surface Material FSSS: 301.02 21 Written Request for Roadbed Approval FSSS: 301.06 22 Testing Results FP-14 301.06 23 Mix Design FP-14 552.03 24 Plans as Required FP-14 552.1 25 Order Lists and Bending Diagrams FP-14 554.03 26 Production Certification FP-14: 554.1 27 Design Drawings, Details and Calculations FP-14: 603.03 28 Assembly Instructions FP-14: 603.04 29 Weed-Free & Approved Seed Mix Certification FSSS: 625.07

6.0 Travel:

Directions from downtown Tucson: Head north on State Route 77 for approximately 40 miles, exit onto South Veterans Memorial Boulevard and head southeast for approximately 9 miles.

Turn right on Black Hills Mine Road and head southeast for approximately 2 miles. Veer right and head southwest on NFSR 4450 (Black Hills Mine Road) for 13 miles. Turn right on NFSR 38 (Mount Lemmon Road) and head north 0.75 miles to Gibbs Wash Bridge. NFSR 38 is single-lane native surface road maintained for highway legal traffic.

Staging Area Map q

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Gibb Wash Bridge

Control Road

Gibb Wash Bridge

Gibb Wash Bridge - Control Road Pit q

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Control Road Pit

Control Road Pit

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