TAHOMA TERRA 4, 5 & 6 2025-03-31REAssoc
version: 5.1.22059.810
Project Information
Project: TAHOMA TERRA 4, 5 & 6
Location: YELM, WA
Owner:
Designer: rjr
Date: April 3, 2025
Facing & Geogrid
Facing Unit: GravityStone Edge (CAN)
Geogrid: Stratagrid
Geotechnical Information
Zone Phi coh gamma
Reinforced 36 20 120
Retained 36 20 120
Foundation 32 50 120
Leveling Pad 40 0 135
Summary
GravityStone Edge earth retaining walls are proposed for this site. The site soils are a silty sand material.
The backfill should a silty sand with less than 20% fines.
Along the retention pond the 2:1 slope below the wall caused some global stability concerns. The
bottom three layers of geogrid were lengthened to 24 ft with the upper layers left at 10ft and 12 ft.
Where the geogrid interferes with the foundations, the upper layer may be cut back as necessary.
7/9/22
Revised layouts on walls 11 and 13. Added walls 14 and 15.
7/28/23 Rev 3
Added wall 16 for Tract E to lot 55.
9/14/23 Rev 4
Walls 12 and 14 revised.
Rev 5 3/31/2025
Layout Revised
Quantities
Quantity Takeoff
Units Geogrid
Wall
count Wall Length CAP
(18") EDGE AREA
(sf)
SG200
(YDS)
SG550
(YDS)
Unit
Fill
Gravel
Fill
(cy)
Fill (cy)
17 LOTS 447-441 R5 361 190 1233 1770 374 22 64 174
18 LOTS 495-399 R5 845 455 3309 4715 1082 56 172 529
TOTALS 1206 645 4542 6485 1456 0 78 237 703
AREA 428.9 6056
TOTALS 6485
Design Fee $4,500
The quantities shown are “neat” counts, contingency values should be added for construction estimates.
The soil parameters used for this preliminary quantity estimate were assumed based on parameters
provided. Actual on-site conditions may differ from the assumed conditions and may cause the
estimated quantities to change.
This preliminary quantity estimates for GravityStone Edge and is meant to assist the contractor in
preparation of a bid package. It does not include additional materials that may or may not be required
to construct the wall(s) including but not limited to waste, filter fabric, drain tile or other materials to
address drop structures and other obstructions in the reinforced zone. It is the responsibility of the
contractor to verify these quantities provided through their own estimate. Race Engineering Assoc.
accepts no responsibility or any discrepancies between quantities provided in this estimate and
quantities required by the final approved design.