INSPECTION & ACCEPTANCE
MANHOLE ADJUSTMENT AND EXTENSION RINGS
***GENERAL REWRITE – PLEASE READ CAREFULLY.***
This memorandum covers Manhole Adjustment and Extension Rings for use on HMA resurfacing projects. The adjustment or extension ring for the manhole may be furnished either as a segmented ring or as a one-unit ring. When it is used, it will effectively raise the height of the manhole to accommodate for the HMA overlay thickness without a need to raise the entire frame from its original foundation.
Approved sources are listed in the Materials Approved Products Listing Enterprise (MAPLE).
Requests for source approval shall be made to the Office of Construction and Materials. Approval will be based on evaluation of the product information provided by the Fabricator.
Shipments to projects shall be accompanied by bill of lading and certificate of compliance with the following information:
1. Fabricator Name
2. Certification Statement
2. Signature of Authorized Person
3. County, Project Number and Contract Number
4. Ring Risers shall conform to the shape, weight, and dimensions of the fabricator approved shop drawings.
“It is hereby certified that the Manhole Ring Riser listed was manufactured to meet the applicable requirements of the Iowa Department of Transportation and the requirements of the ASTM. We also certify that any steel or iron used to fabricate this material meets the requirement of IM 107 Group 2, Buy America..
Acceptance is based on Approved Sources listed in Appendix A of this IM and a certification statement.