Section 246-272B-06050. Horizontal setbacks.

(1) The design engineer shall design the LOSS and verify it is installed in compliance with the minimum horizontal setbacks shown in Table 3 of this section.

(2) The design engineer shall increase the separation distance between the LOSS and a public drinking water well, spring, or surface water supply if required by the water purveyor's source water protection program, prepared under chapter 246-290 WAC, Group A public water supplies.

(3) The department may require greater horizontal setbacks than the minimum values shown in Table 3 when needed to protect public health and the environment. Such areas include, but are not limited to, those with:

(a) Highly permeable soils;

(b) Unconfined aquifers;

(c) Locally identified and state-identified areas of concern such as critical aquifer recharge areas or shorelines;

(d) Shallow soils;

(e) Saturated soils; and

(f) Hand-dug or improperly abandoned wells.

(4) The department may approve a sewer line placed less than ten feet from a water line only:

(a) With the written approval of the owner of the water line; and

(b) When the water line is protected from leakage and contamination consistent with the department of ecology "Criteria for Sewage Works Design," August 2008, or the department of ecology and department of health publication "Pipeline Separation Design and Installation Reference Guide," July 2006.

Table 3: Minimum Horizontal Setbacks

[Statutory Authority: RCW 70.118B.020. WSR 11-12-035, § 246-272B-06050, filed 5/25/11, effective 7/1/11.]

RCW 70.118B.020. WSR 11-12-035, § 246-272B-06050, filed 5/25/11, effective 7/1/11.

Rules

246-290,