WAC 222-34-040
Site preparation and rehabilitation. *(1)
Heavy equipment. Heavy equipment shall not be used in connection
with site preparation or rehabilitation work:
(a) When, because of soil moisture conditions or the type of
soils, undue compaction or unnecessary damage to soil
productivity would occur or erosion would result in damage to
water quality; or
(b) Within riparian management zones, Type A and B Wetlands,
wetland management zones, or within equipment limitation zones of
Type Np and Ns Waters on slopes of 30 percent or less. On slopes
greater than 30 percent heavy equipment shall not operate within
50 feet of Type S through Ns Waters unless a site specific plan
has been approved by the department.
*(2) Surface water drainage. Where site preparation or
rehabilitation involves contouring or terracing of slopes,
drainage ditches, or similar work:
(a) The gradient of ditches or other artificial water
courses in erodible soils shall not cause significant stream,
lake, pond, or wetland siltation.
(b) Ditches and other artificial water courses shall not
discharge onto any road, landing or fill.
(c) Ditches and other artificial water courses shall not be
constructed to discharge onto the property of other parties
without their consent.
*(3) Stream channel realignment. Where work involves
deepening, widening, straightening or relocating the channel; or
bulkheading, riprapping or otherwise stabilizing the banks of a
Type S or F Water, a hydraulic project approval is always
required, and the work shall be done only:
(a) After consultation with any party having an
appropriation permit or registered right to appropriate waters
from the affected stream segment in cases of streams used for
domestic water supplies.
(b) Where no significant adverse effects on either the peak
or minimum water levels or flows downstream can be expected.
(c) In a manner not expected to result in long-term damage
to public resources or to adjacent or downstream property.
(NOTE:
OTHER LAWS AND RULES AND/OR PERMIT REQUIREMENTS MAY APPLY. SEE CHAPTER 222-50 WAC.)