Section 246-272A-0140 - Proprietary distribution products-Certification requirements(1) Proprietary distribution products, including gravelless distribution products and subsurface dripline products, must be registered with the department before permitting, sale, and use. To be eligible for registration as described in WAC 246-272A-0145, products must first be certified as described in this section.(2) To be certified, proprietary gravelless distribution products must:(a) Be constructed or manufactured from materials that are nonde-caying and nondeteriorating and do not leach chemicals when exposed to sewage and the subsurface soil environment;(b) Provide liquid storage volume at least equal to the storage volume provided within the 30 percent void space in a 12-inch layer of drainrock in a drainrock-filled distribution system. This storage volume must be established by the gravelless distribution products, OSS design and installation and must be maintained for the life of the OSS. This requirement may be met on a lineal-foot, or on an overall system design basis;(c) Provide effluent distribution to the infiltrative surface at the soil interface; and(d) Maintain the integrity of the trench or bed. The material used, by its nature and its manufacturer-prescribed installation procedure, must withstand the physical forces of the soil sidewalls, soil backfill, and the weight of equipment used in the backfilling.(3) Proprietary subsurface dripline products shall: (a) Be warranted by the manufacturer for use with sewage and for resistance to root intrusion;(b) Incorporate emitters with a maximum nominal rated discharge of 1.3 gallons per hour. Emitter discharge rate may be controlled either by use of pressure-compensating emitters or with a pressure regulator; and(c) Be color-coded purple to identify that the pipe contains non-potable water from a sewage source.(4) To be certified by the department, the manufacturer must submit: (a) A signed and dated statement by the manufacturer's agent specifically including the following statement, "I certify that I represent (INSERT MANUFACTURING COMPANY NAME) and I am authorized to prepare or direct the preparation of this application for product registration. I attest, under penalty of law, that this document and all attachments, are true, accurate, and complete."(b) A signed and dated statement from the licensed professional engineer including the statement, "I certify that I represent (INSERT PROFESSIONAL ENGINEERING FIRM NAME), that I am authorized to certify the performance characteristics for the proprietary distribution product presented in this application. I attest, under penalty of law, that the technology report is true, accurate, and complete."Wash. Admin. Code § 246-272A-0140
Amended by WSR 24-06-046, Filed 3/1/2024, effective 4/1/2024Statutory Authority: RCW 43.20.050. 05-15-119, § 246-272A-0140, filed 7/18/05, effective 9/15/05.