Page F-7.pdf
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- Attached to
- OR DOT CRGNSA 100(4), Historic Columbia River Highway State Trail, Mitchell Point Crossing
- Solicitation number
- 69056720B000024
About this file
This document outlines requirements for a federal construction contract. The solicitation is for the OR DOT CRGNSA 100(4) project to construct the Historic Columbia River Highway State Trail at Mitchell Point Crossing. Work includes excavating a tunnel according to Section 205 specifications as well as talus and loose rock in adjacent areas. Within the trail limits, the contractor must excavate talus and loose rock to the pavement depth indicated in the plans or overexcavate four inches if loose rock or talus remains, grouting voids and backfilling with compacted aggregate. Earth cuts require scarifying six inches below subgrade and compacting according to Subsection 204.11. The solicitation was issued by the Department of Transportation Federal Highway Administration.
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Text version
F-7 DIVISION 200
Section 204. — EXCAVATION AND EMBANKMENT
03/25/19 – FP-14
Construction Requirements
204.06 Roadway Excavation. Delete this Subsection and substitute the following:
Excavate as follows:
Dispose of unsuitable or excess excavation material according to Subsection 204.11. Replace shortage of suitable material caused by premature disposal of trail excavation.
204.11(c) Less than 50 percent retained on a No. 4 (4.75-millimeter) sieve. Delete the third paragraph and substitute the following:
Use compression-type or vibratory rollers. Compact each layer of material full width to at least 95 percent of the maximum density. Determine the in-place density and moisture content according to AASHTO T 310 or other approved test procedures.
204.14 Disposal of Unsuitable or Excess Material. Delete the text of the first paragraph and substitute the following:
Dispose of non-clean material according to Subsection 203.05(b).
Measurement
204.16 Delete paragraph (a)(2)(b) and substitute the following:
(b) Overbreakage during tunnel excavation;
Revised by Amendment A002
Special Contract Requirements Project: OR DOT CRGNSA 100(4), Historic Columbia River Highway State Trail, Mitchell Point Crossing
(a) Tunnel excavation. Excavate tunnel according to Section 205.
(b) Talus and loose rock excavation. Excavate talus and loose rock to the extents and depths indicated in the Plans for all required areas adjacent to the trail limits. Within the trail limits, excavate talus and loose rock as follows: when a firm and consistent subgrade is provided by the excavation, excavate to the depth of the base of the pavement Section provided in the Plans;
when the subgrade conditions consist of talus or loose rock upon reaching the design excavation depth, overexcavate to 4 inches (100 millimeters) below the subgrade, grout the voids in the loose rock or talus, and backfill with compacted roadway aggregate.
(c) Earth cuts. Scarify earth cuts to 6 inches (150 millimeters) below subgrade within the trail limits. Compact scarified material according to Subsection 204.11.
2020.11.17 18:47:51 -08'00'
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