2.04 LEACHING CATCH BASINS
A. Leaching catch basins shall conform to the requirements for Products, Paragraph 2.1 herein.
B. _ Thestructure perforations shall be as detailed in the Contract Drawings.
C. Stone for backfill around the leaching catch basin shall conform to NHDOT Item 304.5, Crushed
Stone, Course. materials shall be top grade (100% solids, vulcanized) butyl rubber and shall meet
or exceed AASHTO M-198.
2.05 SEWER MANHOLE ACCESSORIES:
A. — Gasket materials shall be top grade (100% solids, vulcanized) butyl rubber and shall meet or
exceed AASHTO M-198.
B. Couplings at the manhole-pipe interface shall be made with a rubber seal system (with or without
stainless steel straps) meeting the requirements of ASTM C923 and recommended for this type of
connection.
C. Stubs installed as specified and indicated on the drawings shall be short pieces of the same class
pipe as that entering the manhole and shall have erther stoppers or end caps as shown on the
drawings. Stoppers or end caps shall be especially designed for that application.
2.06 CATCH BASIN ACCESSORIES:
A. — Anoil and debris trap shall be furnished and installed on outlet pipes in all catch basins. The trap
shall be The Eliminator® as manufactured by Groundwater Rescue, or approved equal.
2.07 PRECASTHEADWALLS
A. Precast headwalls shall conform to the details on the plans. Shea Concrete Products or equal.
PART 3 - EXECUTION
3.01 INSTALLATION:
A. PRECAST SECTIONS:
1. Precast bases shall be supported on a compacted level foundation of crushed stone, as
specified in Section 02300 EARTHWORK, at least 6-inches thick, but shall vary to the
depth necessary to reach sound undisturbed earth.
2022 Sewer Replacement Project Precast Manholes and Catch Basins
Nashua, NH 02631-5
