It is the city of Washougal's policy to recognize and protect important historic and cultural resources, including those listed on the national, state and local registers of historic places; cultural resources inventoried by the State Archaeologist; and as yet unrecorded sites, objects or structures. The city adopts by this reference the "City of Washougal Archaeological Predictive Model" and associated probability maps from Clark County (which may be periodically updated to reflect the best available information), and establishes the following matrix as a guideline for when an archaeological survey is required based upon: the probability as indicated by Clark County records, the described impact potential of land use applications, and the cited exceptions.
(Ord. 1477 § 1, 2004)
Predictive
Class
Designation
Probability Index
Potential for Impacts*
Low
Moderate
High
1
1% – 20%
(Low)
No
No
No
2
21% – 40%
(Low – Moderate)
No
No
Yes
3
41% – 60%
(Moderate)
No
Yes
Yes
4
61% – 80%
(Moderate – High)
No
Yes
Yes
5
81% – 100%
(High)
No
Yes
Yes
*Low potential impacts include those activities involving no ground disturbance, normal maintenance and repair of existing structures and facilities, lands that have been substantially disturbed to a depth of more than eight inches, and areas that have been adequately surveyed in the past with no discovery of resources.
*Moderate potential impacts include activities involving slight ground disturbance not otherwise characterized as having low or high impact potential.
*High potential impacts include activities involving disturbance of ore than 12 inches below the ground surface and more than 10,000 square feet of area.
(Ord. 1477 § 1, 2004)
(1) 
A survey should be required for any high potential impact project located within one-quarter mile of a recorded site, regardless of the probability designation.
(2) 
A survey shall be required for any moderate through high potential impact project within 500 feet of a known unrecorded site, regardless of the probability designation.
(3) 
A survey shall be required upon discovery of an archaeological site during development of any permitted project, regardless of the probability designation.
(4) 
A site walkover shall be an adequate survey for properties in the Predictive Class 1 through 3 unless a significant archaeological site has been discovered or indicated. Any more intensive investigation shall be determined by site-specific conditions, which indicate the need for subsurface analysis.
(Ord. 1477 § 1, 2004)
In any case where the preceding criteria calls for an archaeological survey, the project proponent shall provide an archaeological predetermination report by an archaeologist in order to determine whether the likely presence of resources necessitates a survey.
(Ord. 1477 § 1, 2004)
An archaeological survey shall result in a report addressing the significance of cultural resources present on the site and recommending appropriate mitigation measures.
(Ord. 1477 § 1, 2004)