25 Pa. Code § 73.54 - Subsurface sand filter beds and trenches
(a)
General. Subsurface
sand filters without underdrains shall meet the following criteria:
(1) Subsurface sand filters may not be
utilized on soils where the limiting zone occurs at less than 6 feet below the
mineral soil surface.
(2) The
average percolation rate, as determined by §
73.15 (relating to percolation
tests), shall be greater than 90 minutes per inch.
(3) The average percolation rate at a depth
between 36 and 60 inches shall be within the range of 3-90 minutes per
inch.
(4) The average percolation
rate obtained from paragraph (3) shall be applied to §
73.16(c)
(relating to absorption area requirements) for determination of the absorption
area and other system requirements.
(b)
Construction. Subsurface
sand filters shall be constructed as follows:
(1) The maximum depth of the excavation shall
be 5 feet.
(2) Sand meeting the
specifications of §
73.55(c)
(relating to sand specifications) shall be placed in the entire bed or trench
to a minimum depth of 12 inches.
Notes
The provisions of this § 73.54 amended under section 9 of the Pennsylvania Sewage Facilities Act (35 P. S. § 750.9); The Clean Streams Law (35 P. S. §§ 691.1-691.1001); and section 1920-A of The Administrative Code of 1929 (71 P. S. § 510-20).
This section cited in 25 Pa. Code § 71.63 (relating to retaining tanks).
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