This document is the Deep Burial Installation less than 25ft Nyloplast Detail. Backfill material, drain basins, bottom of structure and notes are discussed.

For backfill selection, only crushed stone or other granular material meeting the requirements of Class II material as defined by ASWTM D2321. Bedding and backfill for surface drainage inlets shall be placed and uniformly compacted to at least 90% standard density.

Drain basins shall be manufactured in riser sections no greater than 84” due to shipping restrictions.

The bottom of structure and adapters shall be encased in concrete. Actual dimensions of concrete must take into consideration local soil conditions and design factors. It shall extend no less than 12” in any direction.

Notes state to refer to detail 7001-110-144 for standard drain basin installation guidelines and traffic collar guidelines.