Questions_and_Answers_0002.pdf
PDF 416 KB Posted
- Attached to
- TRENCHING EXCAVATION Federal contract opportunity
- Solicitation number
- 140G0325Q0037
About this file
This document contains questions and answers (Q&A) for a paleoseismic trenching excavation project for the USGS Earthquake Science Center in Seattle. The Q&A provides specific details about site preparation, tree removal, and excavation logistics. Key details include:
The project involves excavating two trench sites with a minimum of 4 and maximum of 10 trees to be removed, with trees and excavated soil to remain on-site. The total trench area will be approximately 750 square feet, with access via old skid roads. Site 1 is relatively flat, while Site 2 has a steeper (~30-degree) slope. Equipment can be trailered to within 200 yards of the trench sites. The trenches will remain open for approximately one month before being backfilled, and a USGS representative will be present during excavation to ensure clean trench walls.
View the file
Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Sol_140G0325Q0037_Amd_0002.pdf | ||
| Sol_140G0325Q0037_Amd_0001.pdf | ||
| Sol_140G0325Q0037.pdf | ||
| (2)_COMBINED_Construction_Attachments.pdf | ||
| SOW_and_Clauses.pdf |
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Text version
Q1. Can the contractor dispose of the lumber and soil within any area on the project site, or are we required to transport these materials offsite?
A1. All lumber and soils will remain on-site. Removed trees will be placed away from the working area. The excavated soil will be stored in a stockpile along one side of the trench, >5ft from the edge, and then used to refill ~ 1 month later. Please see photo below of example and of prior trench near these sites
Example and profile of paleoseismic trench
Prior trench (2002) near site 1
Q2. How many trees in total do they want removed?
A2. Minimum of 4, which are within the planed trench area, and a maximum of 10 that are proximal. This number depends on what operator needs, but goal is to minimize. Trees are currently marked with yellow flagging.
Q3. Do they want the trees to remain on site, or do they want them hauled away?
A3. Remain in site
Q4. Do they want the stumps from the trees excavated, removed and hauled away, or do they want them to stay in the ground?
A4. Stay in the ground if possible or leave at site
Q5. If any additional areas are to be logged or cleared of vegetation, what is the total square footage of each area.
A5. Total square footage of the trenches will be ~ 750 ft2. The pathways in from the Forest Service roads are old skid roads with small saplings.
Q6. I will need your company information and contact information for the quote.
A6. Please use: USGS, Earthquake Science Center, Seattle Field Office.
Some additional site information
- Equipment (excavator) can be trailered in to approximately ~200 yards of trench sites.
- Site 1 is relatively flat with old skid road with small tree saplings leading to within ~30 ft of site.
- Site 2 also has an old skid road with some saplings leading to it. Will have to mitigate relatively steep (~30-degree) slope following the skid road down to trench site.
- Trenches will remain open for ~1 month then backfilled.
- I will be there during excavation and work with operator to get nice clean walls.
- I also have a water pump to use if nessesary
Lidar slope shade map of trench sites (steeper slopes are dark and flat are light). Blue lines are old skid roads that lead to trench sites (yellow rectangles).
Similar scale map in SOW
File details come from the government source that posted it. Updated .