B09_A3_22R0003_At10_QAs3_0003.pdf
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- Attached to
- GAOA GRUB DAM REHABILITATION
- Solicitation number
- 140L0622R0003
About this file
This document contains questions and answers regarding a federal solicitation for the Grub Dam Rehabilitation project. The solicitation is being conducted by the Bureau of Land Management National Office to rehabilitate the Grub Dam. Additional details provided in the questions and answers include specifications for grouted riprap such as grout mix design requirements, rock placement procedures, and grout thickness. A map showing boring and test pit locations is also attached.
The related federal contract opportunity is solicitation number 140L0622R0003 for the GAOA Grub Dam Rehabilitation project. The solicitation is being conducted by the Department of Interior Bureau of Land Management National Office. No further details are provided regarding response dates, award dates, pricing or other solicitation requirements.
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United States Department of the Interior
BUREAU OF LAND MANAGEMENT
National Operations Center Building 50, Denver Federal Center
P.O. Box 2547 https://www.blm.gov
140L0622R0003 Grub Dam Rehab
Questions and Answers #3
1)Q: Can you provide details and thicknesses for the grouted riprap shown on sheet 9, specifically strength of the grout and gout design limitations, or if there is a standard specification to follow, can the government provide it?
A: The grout mix design requirements are included in specification paragraph 03300-2.10B. Add the following to the end of specification Section 02275:
3.03 DOWNSTREAM CHANNEL ROCK TO BE GROUTED
A. Prior to placing rock in the downstream channel, ensure rock is free of fines or soil which would affect the grout bond. Rocks shall be placed so that they are in contact with each other and the spaces between adjacent boulders are as small as the character of the rock will permit, but will allow full penetration of the grout between all rocks and down to the bedrock subgrade.
B. Total grout thickness is to be six inches less than the rock thickness that is being grouted.
The top six inches of the rock is to be left exposed and not grouted.
C. Any loose material between rocks shall be removed to ensure complete grout penetration down to subgrade and in all voids between rocks. All rock placed shall be approved by the Government at least 24 hours in advance of the scheduled time for grouting to avoid any unnecessary delays in the grouting operation. Rock surfaces shall be moist at the time of grout placement, but shall not contain free water. Vibrators shall be used to make sure all voids are filled between and under rock. The intent is to fill all voids with grout from the subgrade level through the rock layer. In all cases, grout must penetrate to subgrade.
D. At construction joints between grouting, the grout shall be held down 6-inches minimum below the tops of the rock in order to allow grout placed for the next layer to penetrate down and around the tops of the core rocks.
E. Immediately after placement of the grout, protect the grout from premature drying and excessive hot or cold temperatures in accordance with Section 03300.
2)Q: The boring logs were included but not a map or a location of the bores. Due to the depth of the excavations, this is critical information to determine the type of materials to be excavated. Can you provide the document referenced as “figure 2” in the boring logs?
A: The labeled boring and test pit locations are shown on Sheets C1, C2, and C3. Unlabeled boring locations are also shown on Sheets C4, C5, OW1, and OW2. Also, see attached “figure 2.”
https://www.blm.gov/
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