2.3.1 Conventional Beds and Trench Systems
2.3.1.1 Seepage Beds (Title 25. Environmental Protection, Chapter 73,
Section 73.53)
 In-Ground Seepage Bed |
System Highlights (General Highlight of Characteristics Required for this System- It is critical that
you review the PADEP regulations and any local agency regulations regarding the siting and use of
this system.
1. Where the depth to the top of the limiting zone is 60 inches or greater, the system shall be installed
so the bottom of the aggregate is 4 feet above the limiting zone.
2.Maximum Slope of undisturbed soil is 8%.
3.Individual beds of a single on-lot system shall be separated by a minimum distance of 5 feet.
4.Lateral shall be equally spaced or a maximum of 6 feet on center.
5.The bed shall contain a minimum of two lateral or two opposing sets of laterals when pressure
distribution is used.
2.3.1.2 Standard Trench (Title 25. Environmental Protection, Chapter 73, Section 73.52)
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System Highlights (General Highlight of Characteristics Required for this System- It is critical that
you review the PADEP regulations and any local agency regulations regarding the
siting and use of
this system.
1. Where the depth to the top of the limiting zone is 60 inches or greater, the system shall be installed
so the bottom of the aggregate is 4 feet above the limiting zone.
2.Maximum slope of undisturbed soil is 25 %, but for slopes between 15 to 25 % detailed design information
is required.
3.There shall be a minimum of two trenches per field.
4.Trenchs shall approximately follow the ground surface contours so that variations in trench depth shall
be minimized.
5.There shall be at least 6 feet of soil between the treatment tank or dosing tank and the nearest trench.
6.The width of the bottom of the individual trench shall be 12 to 72 inches.
7.The depth to the bottom of the absorption area shall be 12 to 36 inches.
8.The minimum depth of aggregate material under the lateral shall be 6 inches and minimum depth over
lateral is 2 inches.
9.Aggregate depth should be uniform.
10.The top of the aggregate material shall be covered with geotextile fabic, untreated building paper, or
2 inch layer of hay, straw, or similar materials to prevent the backfill material from setting into
the aggregate.
11.The minimum depth of the earth cover over the aggregate in all installation shall be 12 inches.
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