7-SLCC-Taylorsville-Retaining Wall-Site Report.pdf
PDF 16 MB Posted
- Attached to
- SLCC South Retaining Wall Replacement State and local contract opportunity
- Solicitation number
- SLCC2026-W1027
- Issued by
- Salt Lake County, Salt Lake City, Utah
About this file
This is a site report for Salt Lake Community College's South Retaining Wall Replacement project in Taylorsville, Utah, documenting a site visit conducted on November 27, 2024. The report identifies a critical structural failure of a short retaining wall adjacent to a roadway that is leaning at multiple locations along its entire length, with the most severe lean measuring approximately one foot from the base at the worst point. The owner has requested a comprehensive repair solution for the entire wall structure. The site analysis indicates the retaining wall measures approximately 10 feet in length with a maximum height of 3.5 to 4 feet and requires verification of pier depth, drainage systems, geogrid reinforcement, and keystone compact fiberglass pin placement at joints. The report also requires analysis of the repair's impact on an adjacent 15-foot-on-center sound wall system located in close proximity to the failing structure.
The report includes technical specifications and design charts from Keystone Retaining Wall Systems, referencing Keystone Compac and Standard unit configurations with depths ranging from 12 to 21 inches and weights between 69 and 118 pounds. Design guidance notes that wall height calculations assume 120 pounds per cubic foot soil unit weight and minimum 95 percent standard proctor density compaction for backfill materials, with non-critical structure factors of safety greater than 1.5 using Coulomb earth pressure analysis methodology. A qualified engineer is required to perform final design and analysis, with subsurface soil evaluation and positive drainage provisions mandated as part of the scope. The document emphasizes that preliminary design information is provided for planning purposes, and Keystone accepts no liability for the application of these specifications without professional engineering consultation.
View the file
Other files for this state and local contract opportunity
| File | Type | Posted |
|---|---|---|
| 3-Contractors-Agreement (1).docx | DOCX document | |
| 5-Invitation for Bid - SLCC Retaining Wall Replacement .docx | DOCX document | |
| 1-SALT LAKE COMMUNITY COLLEGE GENERAL BID PROVISIONS.pdf | ||
| 2-Certificate-of-Substantial-Completion (1).docx | DOCX document | |
| 4-Subcontractors+List (1).docx | DOCX document | |
| 6-Community BLVD Retaining Wall Bid Request.docx | DOCX document |
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Text version
SLCC Talyorsville- Retaining Wall-Repair -Site visit 11/27/2024 -Short retaining wall next to the road failing
- The retaining wall leaning at multiple location along the entire length of the wall
- At worst case the lean critical where the top is leaning about a foot from the base -Owner wants us to come up with a repair for the entire wall -Analyze the impact of the repair to the adjacent sound wall ft
M A
X
3.5ft MAX
A P
R O
X
0f t
VERIFY PIER
DEPTH
SOUND WALL POST
APROX 15ft OC
SOUND WALL
PANEL
VERIFY
DRAIN ?
HOLLOW
KEYSTONE
COMPAC
BLOCK WALL
VERIFY GEO
REINF?
KEY STONE
COMPAC
FIBERGLASS
PIN AT JOINT
WALL SET
BACK?
Keystone Construction Manual6
The information contained herein has been compiled by Keystone Retaining Wall Systems® LLC and to the best of our knowledge, accurately represents the Keystone product used in the applications which are illustrated.
Final determination of the suitability for the use contemplated and its manner of use are the sole responsibility of the user. Design and analysis shall be performed by a qualified engineer.
Keystone Standard Units
Tri-plane Straight Tri-plane Straight
Keystone Standard I Keystone Standard III
Keystone Compac Units
Tri-plane Straight Tri-plane Straight
Keystone Compac II Keystone Compac III
IN
TRO
D U
C
TIO
N
Keystone® Structural Walls
DESIGN AND BUILD WITH CONFIDENCE
Our Keystone structural products includes a comprehensive assortment of face styles to satisfy virtually any aesthetic requirement. Structural retaining walls are where Keystone began. Keystone’s retaining wall systems continue to be trusted by engineers, architects and contractors worldwide to provide the best site solutions for commercial, municipal, industrial, transportation/DOT and residential applications.
Alternative Face Textures (Compac only)
Left Score Straight Right Score
Regency System
Note: Unit weights, dimensions and availability vary by manufacturer. Please contact your local representative.
Isometric Elevation Plan
Height (in)
Width (in)
Depth (in)
Face Area
(SF)
Weight (lbs)
Volume of Voids to Tail (CF)
Keystone Compac - Series II 8" 18" 12" 1 81-91 0.35
Keystone Compac - Series III 8" 18" 12" 1 69-77 0.41
Keystone Standard - Series I 8" 18" 18" 1 92-113 0.70
Keystone Standard - Series I 8" 18" 21" 1 97-118 0.90
Keystone Standard - Series III 8" 18" 18" 1 80-93 0.81
Keystone Standard - Series III 8" 18" 21" 1 85-99 1.01
18" or 21"
18" 12"
Center Cores
Pin Receiving Core
Pin Core - 1-1/8"Setback
Pin Core - Near Vertical 1/8" Setback
8"
Hewnstone VictorianTri-plane STContemporary
Keystone Retaining Walls 23
The information contained herein has been compiled by Keystone Retaining Wall Systems® LLC and to the best of our knowledge, accurately represents the Keystone product used in the applications which are illustrated.
Final determination of the suitability for the use contemplated and its manner of use are the sole responsibility of the user. Design and analysis shall be performed by a qualified engineer.
SEC
TIO
N B: D
ESIG
N
C H
A
RTS
Gravity Wall Schematic
Slope
Total Height
Retained Soil Zone
SETBACK WALL
(1" (25mm) min. setback per unit)
B:1 - MAXIMUM HEIGHT GRAVITY WALL - KEYSTONE COMPAC®
NOTES:
• �Wall height (H) is the total height from top to bottom.
• �Minimum wall embedment should be 6-inches or one unit below grade, whichever is greater. (See page 11)
• �Subsurface soils must be capable of supporting wall system.
• �Unit drainage fill is ¾-inch clean crushed stone.
• �Leveling pad is crushed stone base material.
• �All backfill materials are compacted to minimum 95% standard proctor density or 92% modified proctor density.
• �Finished grade must provide positive drainage.
• ��Calculations assume a unit weight of 120 PCF (19kN/M2) for all soil types. Assumed angles for earth pressure calculations are: Sand/ Gravel=34°, Silty Sand=30° and Sandy Silt/Lean Clay=26°. Walls are non-critical structures with FS>1.5. Gravity wall charts are performed using Coulomb earth pressure analysis. (NCMA 3rd Edition). No surcharges, except slopes, were used in the analysis.
• ��Surcharges or special loading conditions will reduce maximum wall heights. Sliding calculations assume a 6-inch crushed stone leveling pad as compacted foundation material. The information provided is for preliminary design use only. A qualified professional should be consulted. Keystone accepts no liability for the use of these tables.
MAX HEIGHT BACKSLOPE
Soil Type Level 4H:1V 3H:1V 2H:1V
Sand/Gravel 3.00' 2.33' 2.33' 2.33'
Silty Sand 2.33' 2.33' 2.33' 1.67'
Silt/Lean Clay 2.33' 1.67' 1.67' <1.00'
MAX HGT. BACKSLOPE
Soil Type Level 4H:1V 3H:1V 2H:1V
Sand/Gravel 3.67' 3.00' 3.00' 3.00'
Silty Sand 3.00' 3.00' 2.33' 2.33'
Silt/Lean Clay 3.00' 2.33' 2.33' <1.00'
Near Vertical Setback 1⅛-inch Setback Setback Option
NEAR VERTICAL WALL
(⅛" setback per unit)
SETBACK WALL
(1⅛" setback per unit)
Slope
Total Height
Retained Soil Zone
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