Whenever seepage beds are employed, they shall meet the
requirements of §
73.52(b)(5), (6), (8) and
(10)-(16) (relating to standard trenches) in
addition to the following specifications:
(1) The maximum slope of the undisturbed soil
of a proposed absorption area where a seepage bed may be permitted is
8.0%.
(2) The required absorption
area may be provided by one or more seepage beds:
(i) The individual beds of a single onlot
system shall be separated by a minimum of 5 feet.
(ii) When elevated sand mound beds are used,
the distance between beds shall be measured from the toe of the sand of each
bed.
(3) The bed shall
contain a minimum of two laterals or two opposing sets of laterals when
pressure distribution is used.
(4)
Laterals shall be equally spaced a maximum of 6 feet on center, except as
provided in §
73.44(c)(8)
(relating to pressurized distribution design).
(5) Laterals shall be placed no further than
5 feet nor less than 2 feet from the sidewalls of the bed.
(6) Laterals shall be placed in the bed so
that the first and last discharge holes may be no more than 5 feet nor less
than 2 feet from the ends of the bed.
Notes
The
provisions of this § 73.53 adopted January 21, 1983, effective
1/22/1983, 13 Pa.B. 508; amended
November 7, 1997, effective 11/8/1997, 27 Pa.B.
5877.
The provisions of this § 73.53 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); 25 Pa. Code §
73.44 (relating to pressurized
distribution design); 25 Pa. Code §
73.54 (relating to subsurface sand
filters); and 25 Pa. Code §
73.55 (relating to elevated sand
mounds).
