25 Pa. Code § 73.54. Subsurface sand filter beds and trenches.

§ 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.
   (5)  System design shall meet the requirements of §  73.52 (relating to standard trenches) or §  73.53 (relating to seepage beds) except as modified by subsection (b).
(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.

Authority

   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).

Source

   The provisions of this §  73.54 adopted January 21, 1983, effective January 22, 1983, 13 Pa.B. 508; amended November 7, 1997, effective November 8, 1997, 27 Pa.B. 5877. Immediately preceding text appears at serial pages (217334) to (217335).

Cross References

   This section cited in 25 Pa. Code §  71.63 (relating to retaining tanks).

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