MHCC parking lots R-U tree trenches v2 for bid docs.pdf
PDF 424 KB Posted
- Attached to
- Parking Lots Tree Trenches State and local contract opportunity
- Solicitation number
- S-P00400-00006484
- Issued by
- Multnomah County, Gladstone City, Oregon
About this file
This document is a set of construction plans and specifications for a parking lot tree trench retrofit project in Multnomah County, Oregon. The project involves removing existing asphalt, excavating underlying soil, and installing new soil and mulch to treat stormwater runoff from four parking lots near the Yoshida Sports Complex. Key details include the creation of tree trenches with 3-way soil blend, 5-foot walkways, concrete curb and gutters, and evenly-spaced storm drain inlets. The construction plans provide dimensions, quantities, and specifications for the various project elements.
The project will be procured through a formal Invitation to Bid (ITB) process, with the construction documents and specifications included as part of the bid package. No other details are provided regarding bidding requirements, deadlines, award dates, or contract term. Pricing terms, funding sources, and other commercial details are not included in the provided materials.
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Other files for this state and local contract opportunity
| File | Type | Posted |
|---|---|---|
| Bid tabulation~1.pdf | ||
| Walkthrough~2.pdf | ||
| Q-V_M1.pdf | ||
| 1.pdf | ||
| 2.pdf | ||
| Posted ITB 2023.pdf | ||
| Q-V_E1.pdf | ||
| Pre-proposal attendees.docx | DOCX document |
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Text version
312’ 293’ ’292
32 parking spaces /side (9’W spaces)
31 parking spaces /side (10’W spaces)
29 parking spaces /side (10’W spaces)
23 parking spaces /side (10’W spaces)
Lights 8’ x 8’
Create 5’ walkways
Create 5’ walkways
Figure 1: R, S, T and U Tree Trench Project overview
Existing asphalt Existing asphalt
3-way soil blend
4’ - 0”
New asphalt
New asphalt
4” AC
3” Base rock
9’ - 0” saw cut and asphalt removal
Mulch 3”
Figure 2: Tree Trench (cross sectional view)
Concrete curb and gutter (see GS-103)
NOTES:
1. Concrete curb and gutter shall follow GS-103 (figure 5), and inlets shall follow GS-104 (figure 6) and be spaced a maximum of every 25 feet
2. Fracture and loosen the native soil following initial excavation and before installing structural soil or 3-way soil blend
3. 3-way soil shall follow specifications in Appendix F of Gresham’s Stormwater Management Manual
6” bench, if needed for curb construction
Figure 3: Tree Trench (plan view)
Concrete base for existing light poles
(8’ x 8’)
3-way soil 4’ - 0”
Saw cut line
Create 5’ wide new walkway on west side of center light
Tree
Tree spacing Evenly spaced, but approx. 25’ O.C. from lights and other trees
New asphalt
Overflow notches (see note 2)
NOTES:
1. Inlets shall follow GS-104 (figure 6) and be spaced a maximum of every 25 feet. Space evenly and ensure that an inlet is located at the downstream (east end) of each reach of tree trench prior to any interruption (e.g. concrete bases for light poles)
2. Overflow notches shall be 4” wide and 6” deep (so that water can overflow to north side of tree trench). Space every 10 feet
3. 3-way blend soil shall follow specifications in Appendix F of Gresham’s Stormwater Management Manual
4. 5’ wide walkway to west of center light post. All other trenches shall end at the 8’ x 8’ light post bases
5. Replace electrical conduit and wire between light posts
Inlet spacing Evenly space. Maximum of 25’
Concrete curb inlet (see note 1)
Concrete curb and gutter
Overflow spacing 10’
312’ 293’ 232’292’
Notes:
1. Light poles are spaced about 100 feet apart
2. Inlets shall be evenly spaced; max of 25’ apart.
Figure 4: Curb inlet spacing
Walkways
Curb Inlets
Figure 5: Concrete Curb and Gutter (GS-103)
12”
NOTES:
1. Concrete shall be 3,300 PSI strength at 28 days.
2. Contraction joints shall be placed every 15’.
3. Finish all exposed concrete surfaces
4. Structural soil shall be compacted to at least 95% Proctor Density from a standard compaction curve AASHTO T 99 (ASTM D 698) prior to placement of base rock/asphalt and pouring concrete curb
Figure 6: Concrete Curb Inlet (GS-104)
12”
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