Oregon Administrative Rules
Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY
Division 73 - CONSTRUCTION STANDARDS
Section 340-073-0041 - Filter Fabric
Universal Citation: OR Admin Rules 340-073-0041
Current through Register Vol. 63, No. 3, March 1, 2024
Except as otherwise allowed by the department, filter fabric used as a barrier between the lower lens of drain media and the medium sand in a conventional sand filter system must meet the following specifications:
(1) Material synthetic fabric, either spunbonded or woven.
(2) Burst strength not less than 25 psi.
(3) Air permeability not less than 500 cfm per sq. ft.
(4) Water flow rate not less than 500 gpm per sq. ft. at 3 inches of head.
(5) Hydrophilic surface reaction to water.
(6) Equivalent opening size of 70 to 100 sieve.
(7) Chemical properties:
(a) Nonbiodegradable.
(b) Resistant to acids and alkalies within a
pH range of 4 to 10.
(c) Resistant
to common solvents.
Stat. Auth.: ORS 454.625 & 468.020
Stats. Implemented: ORS 454.615
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