§ 13.48.060. Perforated pipe—Support and filter bed.


Latest version.
  • A.

    Perforated pipe shall be supported by grade stakes or equivalent on at least five-foot centers.

    B.

    Crushed stone, gravel, or similar filter materials acceptable to the administrative authority and having adequate voids, varying in size from three-quarters to one and one-half inches in size, shall be placed in the trench to the depth and grade required in this section. Perforated piping shall be completely encased in filter material. Untreated building paper, filter fabric, or similar material shall then be placed over the filter bed to prevent closure of voids with earth backfill.

    C.

    The connecting pipe between a septic tank and a leaching line, or between leaching lines, shall be laid with approved watertight joints on natural ground.

    D.

    Depths of gravel under the perforated pipe in the leaching trench may be not less than twelve nor more than forty-eight inches, as determined by the administrative authority.

(Ord. 1121 § 3, 1997; Ord. 1109 § 1 (part), 1996: prior code § 5591)