Installation Guide

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A
IG102 © ADS 2008
The recommendations presented here detail how to install a dependable subsurface drainage or groundwater control
system. Installation with proper backfill materials, compaction levels, and placement procedures are essential to
achieve long term system performance. These recommendations assume that the drainage designer used design
criteria available from ASTM F449 and ADS. The designer should discuss installations involving conditions not covered
by these documents (poor soils, high loads, or other factors that may affect the performance of the system) with an
ADS representative.
Backfill Selection
• Only native soil meeting class I, II, or III as described in Table 1, are acceptable backfill materials.
• Class I materials can be dumped around pipe. Lightly tamp or knife to ensure voids are eliminated.
• Non-cohesive sand, sand/gravel mixes and other Class II or III materials must be compacted to remove voids.
• For pipe with burial depths 8’ or less, compaction may not be necessary, provided the trench bottom is shaped in
accordance with Figure 2.
Table 1
Classes of Embedment & Backfill Materials
Soil Classification
Description
ASTM
D2321
ASTM
D2487
Min. Compaction
Required (Std.
Proctor Density
(%)
Graded or crushed stone
Crushed gravel
Class I - Dumped
Well-graded sand, gravels,
and gravel/sand mixtures;
Poorly graded sand,gravels
and gravel/sand mixtures;
little or no fines
Class II GW
GP
SW
SP
85%
Silty or clayey gravels,
Gravels/sand/silt or gravels
and/clay mixtures, silty or
clayey sands, sand/clay or
sand/silt mixtures
Class III GM
GC
SM
SC
90%
Inorganic silts and low
to medium plasticity clays;
gravelly, sandy, or silty
clays; some fine sands
Class
IVA
ML
CL
Material Not
Recommended
*Layer Heights should not exceed one-half the pipe diameter. Layer
heights may also need to be reduced to accommodate compaction
method.
INSTALLATION GUIDE
Sin
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IG 1.02
January 2008