This document is the Oregon - Arc 18 Chamber Installation Guide. Product description, installation instructions and configurations explained.

The Arc 18 chamber is an economical, easy-to-install alternative to conventional on site leachfield systems. In a conventional on-site leachfield system, 4-inch pipe and gravel are used to fill in the excavation. The Arc chamber units eliminate the need for gravel, thereby reducing many of the problems inherent in gravel systems, including compaction, loss of storage, and fines. The open bottom design of the Arc chamber maximizes infiltrative surface area, while its structural design ensures long-term trench integrity. The Oregon Department of Environmental Quality has authorized the use of chambers either in gravity-fed or pressure dosed applications, as a replacement for the traditional 18-24-inch wide gravel trench.

This specification describes the trench installation guidelines for the Arc 18 system. 11 steps describe the process with accompanying photographs and sizing chart.

Installation configurations show equal gravity distribution trench cross section and plan view, same-end (drop box) serial distribution trench cross section and plan view, drop box cross section view, alternating end inlet serial distribution trench cross section and plan view, pressure distribution trench cross section and plan view and the value box or irrigation box side view. Diagrams for each are included.