B09_Amnd_0002_Att_01_Q_A_BRCA_310427_0002.pdf

140P2026R0065 Amnd 0002 Q&A

BRCA 310427 Contractor Questions

1. Existing utility locations and conflicts

Priority: High | Reference: Specification 01 11 00; site improvements and drainage sheets

Please provide available utility records and clarify responsibility for locating and potholing existing buried utilities within the proposed excavation, storm drain, shelter foundation, and pavement work areas. Please identify the procedure for addressing undocumented utilities and conflicts encountered during construction.

Available utility information is limited to the utility information shown in the Construction Drawings and the requirements in the specifications. The contractor is responsible for investigating and verifying the existence, horizontal location, depth, and points of connection of utilities that may affect the Work before beginning excavation.

Known utilities identified in the specifications include a potable water line along the west side of Bryce Canyon Road connecting the Visitor Center to the main Park system. The specifications also identify the potential presence of underground power, water, communication, and sanitary sewer lines.

The contractor shall:

1. Contact Underground Service Alert, “811,” at least two working days before excavation.

2. Notify the Contracting Officer and applicable utility service providers of proposed excavation locations and times.

3. Locate and pothole underground water, wastewater, electrical, and communication lines within the construction limits.

4. Specifically locate and pothole the potable water line along Bryce Canyon Road.

5. Pothole and locate utilities in all areas where excavation will extend below existing grade and at proposed culvert crossings.

6. Protect all existing utilities to remain and prevent disruptions to facilities outside the project limits.

7. Coordinate electrical service requirements with Garkane Energy Cooperative and water, wastewater, and communication requirements with the designated NPS Park representative identified in Specification 01 73 40.

If an undocumented utility or conflict is encountered, protect the utility, stop affected work, and notify the Contracting Officer. Submit an RFI with photos, field measurements, and a proposed resolution. Do not proceed until directed.

Damage to unknown utilities shall be repaired and is subject to equitable adjustment under Section 01 11 00.

The contractor is responsible for damage to known utilities or resulting from inadequate investigation.

For utility plans and please refer to:

Sheet G4 – SURVEY CONTROL PLAN, Page 5 of 61 (This plan identifies utilities)

Sheet G3 – SITE PLAN, Page 4 of 61 (This plan identifies utilities)

2. Culvert extensions and storm-drain tie-ins

Priority: High | Reference: Specification 33 41 01; civil drainage plans

Please confirm the material, diameter, invert elevations, and condition of each existing culvert at the proposed tie-ins. Where field conditions differ from the drawings, clarify whether the existing pipes are to be reused, extended, or replaced in full. Please provide connection details and identify any temporary drainage bypass requirements.

New storm-drain pipe shall be corrugated polymer-coated steel conforming to AASHTO M 245 and Section 33 41 01. Pipe, fittings, couplings, and flared end sections shall meet the Contract Drawings and specified bituminous-coating requirements.

Pipe diameters, inverts, slopes, lengths, cover, and tie-in locations shall be verified from the drawings and in the field before construction.

The contractor shall verify existing culvert locations, sizes, materials, inverts, and conditions before removal or connection and report discrepancies to the Contracting Officer. Existing culverts may be reused only if suitable, compliant with the specifications and drawings, and approved by the Contracting Officer.

Extensions shall use compatible connections, rubber gaskets, and required neoprene isolation where dissimilar metals contact.

If field conditions differ from the drawings, the contractor shall stop affected work and submit an RFI with survey data, measurements, photographs, and recommended corrective action. No reuse, extension, or replacement beyond the contract requirements shall proceed without written direction.

The contractor shall maintain drainage, keep excavations free of water, and comply with the SWPPP and UPDES permit. Any required temporary bypass or diversion shall be incorporated into the work plan and submitted for review before disrupting existing drainage. Permanent drainage design changes require written direction from the Contracting Officer.

For culvert plans and details please refer to:

Sheet G3 – SITE PLAN, Page 4 of 61 (This plan identifies all existing & proposed culverts as well as pipe sizes)

Sheet G4 – SURVEY CONTROL PLAN, Page 5 of 61 (This plan identifies all existing pipe inverts & diameters)

Sheet X1 – DEMOLITION PLAN, Page 10 of 61 (This plan identifies all piping that needs to be removed)

Sheet C7 – SEDIMENT CONTROL PLAN EAST, Page 17 of 61 (This plan identifies all proposed culverts and specifies detail sheets for each culvert)

Sheet C8 – SEDIMENT CONTROL PLAN WEST, Page 18 of 61 (This plan identifies all proposed culverts and specifies detail sheets for each culvert)

Sheet C9 – CULVERT PROFILE, Page 19 of 61 (This sheet contains an enlarged plan and section of a culvert)

Sheet C10 – CULVERT PROFILE, Page 20 of 61 (This sheet contains an enlarged plan and section of a culvert)

Sheet C11 – CULVERT PROFILE, Page 21 of 61 (This sheet contains an enlarged plan and section of a culvert)

Sheet C12 – CULVERT PROFILE, Page 22 of 61 (This sheet contains an enlarged plan and section of a culvert)

3. Retaining wall foundations and geotechnical conditions

Priority: High | Reference: Specifications 03 30 00 and 31 23 00; Appendix A geotechnical report; structural drawings

Please confirm the allowable bearing pressure, excavation limits, undercut and over-excavation criteria, and treatment of unsuitable material at the proposed cast-in-place retaining wall and shelter foundations. Please clarify whether rock excavation is anticipated and how unforeseen excavation will be addressed and compensated under the lump-sum CLIN.

The allowable bearing pressure is 1.8ksf (4ksf nominal* 0.45 resistance factor). See spec and table below.

Unsuitable material below the required foundation or subgrade elevation shall be excavated as directed by NPS and replaced with approved material. Geotextile may also be required. Section 31 23 00 identifies over-excavation, unsuitable material removal, and replacement as change-order work.

Rock was encountered in only one of five geotechnical borings, at approximately 10.5 feet below ground surface. Subsurface conditions may vary; therefore, rock excavation is possible but not confirmed at all foundation locations.

Blasting is prohibited. Approved rock excavation methods include pneumatic or hydraulic hammers, hydraulic rippers, heavy-duty rock-ripping buckets, or approved expansive demolition grout. Section 31 23 00 defines rock based on equipment limitations and specifies change-order compensation when no rock excavation bid item exists.

Although CLIN 1 is lump sum, Section 31 23 00 identifies classified rock removal, directed over-excavation, and unsuitable material replacement as change-order work. The contractor shall notify the Contracting Officer before proceeding and document locations, elevations, dimensions, material characteristics, equipment used, photographs, and quantities. Pricing and time-extension requests shall comply with Sections 01 26 01 and 01 32 16, including itemized pricing and a time-impact analysis when additional time is requested.

For retaining wall details please refer to:

Sheet C13 – RETAINING WALL DETAILS, Page 23 of 61 in the CD Set.