E. Retaining Structures
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*Are select materials specified for wall backfill with gradation and compaction requirements covered in the specification?
(Yes / No / Unknown or N/A)
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Are limits of required select backfill zones clearly detailed on the plans?
(Yes / No / Unknown or N/A)
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Are excavation requirements specified, e.g., safe slopes for excavations, need for sheeting, etc.?
(Yes / No / Unknown or N/A)
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*Where alternative wall types will be allowed, are fully detailed plans included for all alternatives?
(Yes / No / Unknown or N/A)
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Were designs prepared by the wall supplier?
(Yes / No / Unknown or N/A)
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Were wall supplier's design calculations and specifications reviewed and approved by the structural and geotechnical engineers?
(Yes / No / Unknown or N/A)
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*Where proprietary retaining walls are bid as alternates, does bid schedule require bidders to designate which alternate their bid is for, to prevent bid shopping after contract award?
(Yes / No / Unknown or N/A)
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Have FHWA guidelines for experimental designations for certain proprietary wall types been followed?
(Yes / No / Unknown or N/A)
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Is ROW limit or easements shown on plans and mentioned in specifications where anchors are to be installed?
(Yes / No / Unknown or N/A)
Top-down Construction Type Walls
(See "Manual for Design & Construction Monitoring of Soil Nail Walls", FHWA SA-96-069R and "Ground Anchors and Anchored Systems", FHWA IF-99-015)
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*For soil nail and anchor walls are the following included in the provisions:
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Construction tolerances?
(Yes / No / Unknown or N/A)
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Minimum drill-hole size?
(Yes / No / Unknown or N/A)
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Material requirements?
(Yes / No / Unknown or N/A)
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Load testing procedures and acceptance criteria?
(Yes / No / Unknown or N/A)
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Construction monitoring requirements?
(Yes / No / Unknown or N/A)
*A response other than (yes) or (N/A) for any of these checklist questions is cause to contact the appropriate geotechnical engineer for a clarification and/or to discuss the project.
