Table IX
Options and Methods to Address an OSS Failure
Options | Method |
A | Repair or replace the OSS, with a similar OSS, if the OSS provides comparable or better long-term sewage treatment and effluent dispersal outcomes where: 1. The effluent treatment and soil dispersal component to be repaired or replaced is not closer to any surface water, well, or spring than the minimum separation distance required in Table IV of WAC 246-272A-0210(1); 2. The soil dispersal component to be repaired or replaced complies with the treatment level and distribution method requirements in Table VI of WAC 246-272A-0230; 3. The local health officer has a permit or record of the OSS on file; and 4. The repair or replacement will not result in an OSS that meets the definition of failure. |
B | B Repair or replace the OSS with an OSS in compliance with new construction requirements under this chapter. |
C | Connect the residence or facility to a: 1. Publicly owned LOSS; 2. Privately owned LOSS where it is deemed economically feasible; or 3. Public sewer. |
D | Repair or replace the OSS in conformance with Table X of this section. |
E | Use a holding tank. |
F | Obtain a National Pollution Discharge Elimination System or state discharge permit from the Washington state department of ecology issued to a public entity or jointly to a public entity and the OSS owner only when the local health officer determines: 1. An OSS is not feasible; and 2. The only realistic method of final dispersal of treated effluent is discharge to the surface of the land or into surface water. |
Table X
Treatment Component Performance Levels for Repair of OSS Not Meeting Vertical and Horizontal Separations1
Vertical Separation (in inches) | Horizontal Separation2 | |||||||||||
[LESS THAN] 30 feet | [GREATER THAN EQUAL TOO] 30 [LESS THAN] 50 feet | [GREATER THAN EQUAL TOO] 50 [LESS THAN] 100 feet 3 | [GREATER THAN EQUAL TOO] 100 feet | |||||||||
Soil Type | Soil Type | Soil Type | Soil Type | |||||||||
1 | 2 | 3-6 | 1 | 2 | 3-6 | 1 | 2 | 3-6 | 1 | 2 | 3-6 | |
[LESS THAN] 12 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | B & BL2 | B & BL2 | B & BL2 |
[GREATER THAN EQUAL TOO] 12 [LESS THAN] 18 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | B & BL2 | B & BL2 | A & BL1 | B & BL2 | B & BL2 | Conforming OSS | ||
[GREATER THAN EQUAL TOO] 18 [LESS THAN] 24 | A & BL1 | A & BL1 | A & BL1 | A & BL1 | B & BL2 | B & BL2 | A & BL1 | B & BL2 | B & BL2 | |||
[GREATER THAN EQUAL TOO] 24 [LESS THAN] 36 | A & BL1 | B & BL2 | B & BL2 | B & BL2 | B & BL2 | B & BL2 | B & BL2 | B & BL2 | C & BL3 | |||
[GREATER THAN EQUAL TOO] 36 | A & BL1 | B & BL2 | B & BL2 | B & | C & BL3 | C & BL3 | B & BL2 | C & BL3 | C & BL3 |
1 The treatment component performance levels correspond with those established for treatment components under the product performance testing requirements in Table III in WAC 246-272A-0110.
2 The horizontal separation indicated in Table X of this section is the distance between the soil dispersal component and the surface water, well, or spring. If the soil dispersal component is up-gradient of a surface water, well, or spring to be used as a potable water source, or beach where shellfish are harvested, the next higher treatment level shall apply unless treatment level A and BL1 is already required.
3 On a site where there is a horizontal setback of 75-100 feet between an OSS dispersal component and an individual water well, individual spring, nonmarine surface water or surface water that is not a public water source and a vertical separation of greater than 12 inches, a conforming OSS that complies with WAC 246-272A-0210(4) shall be installed if feasible.
Wash. Admin. Code § 246-272A-0280
Statutory Authority: RCW 43.20.050. 05-15-119, § 246-272A-0280, filed 7/18/05, effective 7/1/07.