Installation Guide

Figure 1

Typical Backll Structure

Alternate Back Fill Methods: Shaped Trench Bottoms

Shaped trench bottoms may be used in lieu of the standard trench detail shown in Figure 1, provided a free

owing pea gravel or small rock chips are used to ll in the resultant void areas. Pea gravel or small chips shall

be clean material passing a 3/8” (9.5mm) sieve meeting the class I, II, or III requirements of ASTM D 2321. This

applies only to those insitu soil conditions where the native soil can be cut to a stable shaped trench. Line and

grade may be affected due to the use of a modied trench bottom which may affect the pipe hydraulics.

Figure 2

Shape Trench Bottoms

2 (a)

“V” Groove

4”- 8”(100 mm - 200 mm)

2 (b)

Trapezoidal Bottom

8”- 24”(200 mm - 600 mm)

2 (c)

Circular Bottom

8”- 24”(200 mm -600 mm)

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