Specifications include, but are not limited to: A.Simple Spacing ThinningWhen thinning on a spacing basis, Contractor will select and leave uncut the largest live conifer trees of goodform and vigor that will maintain the average spacing designated in the Unit Description Table. To maintainaverage spacing, Contractor may not need to cut as many trees immediately adjacent to gaps. However, Washington State Department of Natural Resources ▪ Silviculture Contract #1798 Page 12 of 16 Template Revised: 6/28/2018clumps or patches should not be left unthinned to make up gaps in the stand. If the Compliance Forester determines that narrower spacing is appropriate for portions of a Unit, 12' x 12' spacing will be used. Spacing is the average distance between trees that will result in the correct number of tree left per acre. The number of trees left per acre will be measured by DNR to determine compliance with the Per Acre Zone of Acceptance as described in Clause C-02. B.Diameter Limit ThinningWhen thinning on a diameter limit basis, Contractor shall cut trees smaller than the diameter limit, specifiedin the Unit Description, and will leave uncut the largest live conifer trees of good form and vigor that willmaintain the spacing designated in the Unit Description. Contractor will only cut trees larger than thediameter limit when individual trees are clearly diseased, damaged, or deformed. As a general rule, smalltrees growing into the canopy of the larger trees will be cut. Spacing will be determined by the averagenumber of trees left uncut per acre, including trees both above and below the diameter limit. Contractor shallnot damage the stand by cutting trees that will create undesirable gaps in the stand. The number of trees leftper acre will be measured by DNR to determine compliance with the Per Acre Zone of Acceptance asdescribed in Clause C-02, except when desirable trees exceeding the diameter limit comprise a majority of thetotal tree count. In that case, the Per Acre Zone of Acceptance will be increased by the number of trees abovethe diameter limit exceeding a simple majority.B- 06 Order of Selection of Leave TreesThe order of selection of leave or crop trees will be as follows: A.Leave dominant and necessary co-dominant trees.B.Maintain specified average number of trees per acre.C.Maintain specified average spacing.D.Select crop tree by species in the following order unless otherwise specified in the Unit Description: See UnitDescription