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Environmental
Scientists, Hydrogeologists, Soil Scientist, and Environmental Education
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2.3.2 Subsurface Sand Filter Beds and Trenches (Title 25. Environmental Protection, Chapter 73, Section 73.54)
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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. The subsurface sand filter system without an underdrain
system is considered a conventional on-lot wastewater disposal system in
Pennsylvania. In general, these systems have found application on areas of
disturbed or compacted lands, such as mine spoils, overburden stock piles, and
compacted surface soils. These systems can be used when:
1. The depth to the limiting zone occurs at less 6 feet below the mineral soil
surface.
2.Maximum Slope of undisturbed soil is ?%.
3.The average percolation rate, as determined, by conventional test, see Section
73.15, yields a percolation rate of > 90 min/inch
4.The average percolation rate at a depth between 36 and 60 inches shall be
within 3 to 90 minutes/inch.
5.Maximum slope for trench systems is 25 %, but at slopes between 15 and 25 % a
detailed design is required. For bed systems, the maximum slope is 8 %.
6.Regarding construction, the system design will meet Section 73.52 (trench) or Section 73.53 (beds) except:
Maximum installation depth is 5 feet.
Minimum depth of approved sand is 12 inch (Section 73.55 (c))
and the sand will meet meet the specifications in Section 73.55(c).
For more details, see Chapter 73, Section 73.54.
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