Bill Starks
State Researcher
http://apps.leg.wa.gov/documents/billdocs/2013-14/Pdf/Bills/Senate Bills/5048.pdf
(6) "Posting in a conspicuous manner" includes posting a sign or signs reasonably likely to come to the attention of intruders, indicating that entry is restricted or the placement of identifying fluorescent orange paint marks on trees or posts on property. Identifying fluorescent orange marks must bea) Vertical lines not less than eight inches in length and not less than one inch in width; (b) Placed so that the bottom of the mark is between three and five feet from the ground; and (c) Placed at locations that are readily visible to any person approaching the property and no more than one hundred feet apart on forest land, as defined in RCW 76.09.020, or one thousand feet apart on land other than forest land.
(6) "Posting in a conspicuous manner" includes posting a sign or signs reasonably likely to come to the attention of intruders, indicating that entry is restricted or the placement of identifying fluorescent orange paint marks on trees or posts on property. Identifying fluorescent orange marks must bea) Vertical lines not less than eight inches in length and not less than one inch in width; (b) Placed so that the bottom of the mark is between three and five feet from the ground; and (c) Placed at locations that are readily visible to any person approaching the property and no more than one hundred feet apart on forest land, as defined in RCW 76.09.020, or one thousand feet apart on land other than forest land.