Precommerical Thinning Contract - Pacific Cascade Region

2026-11-03

The Washington State Department of Natural Resources , hereafter called “ Agency / DNR ”, is initiating this Solicitation for silvicultural land management services on state managed forestlands . SPECIFICATIONS FOR THE ACTIVITY Contractor shall perform precommercial thinning work as described below . B - 01 Precedence between Sections Section I - B covers the general standards that apply over the whole contract . If a change is required on a site by site basis those differences will be outlined on the Unit Description Form ( Section II - A ). The site specific details found on the Unit Description Form should take precedence over these general guidelines when they exist . If special requirements noted in the Unit Description conflict with requirements in this Section , the special requirements will prevail . B - 02 Boundaries The boundaries depicted on Unit Map ( Section II - B ) delineate the thinning area . Contractor is responsible for completing all Work to boundaries . The thinning boundaries will consist of easily identifiable features ( including but not limited to roads , streams , or abrupt changes in forest type or age ). Flagging will be used for areas where identifiable features are absent . Contractor is responsible for understanding the location of all boundaries . Failure to complete Work to boundaries in any Unit renders Work in that Unit incomplete , and no payment will be made to Contractor for any Work on that Unit . No payment will be provided for Unit ( s ) with Work that extends beyond Unit boundaries . Work extending beyond Unit boundaries will be considered breach of contract . See Clause A - 23 , above . B - 03 Contractor shall furnish : The Contractor shall provide all of the following at its own expense : A . A minimum crew size of 10 workers , and a maximum crew size of 14 workers , unless 2 foremen are present and otherwise approved by the Compliance Forester ; B . Adequate crew supervision , including at least one qualified non - thinning , English - speaking foreperson per crew , unless otherwise allowed by the Compliance Forester . The foreperson must have one season ( at least three ( 3 ) months ) of precommercial thinning experience . Documentation of a foreperson ’ s experience shall be provided to the DNR upon request ; C . All equipment and supplies for mechanical treatment , as well as any specific tool requirements that are detailed in the Unit Description ( Section II - A ); D . All safety equipment ; E . All costs of operation and maintenance not specifically furnished by the DNR ; B - 04 DNR shall furnish : A . Compliance Forester ( s ) to acquaint the Contractor with each unit to be worked and to conduct periodic field inspections . B . Boundary marking and access to the unit as reasonably necessary to complete the contract . B - 05 Thinning Methods Selection of leave trees or crop trees will be made by the Contractor according to the following specifications as well as those found in the Unit Description table ( Section II - A ). Two contrasting thinning procedures are recognized . The particular method to be used is designated for each unit on the Unit Description Table . These are Simple Spacing Thinning and Combination of Spacing , Height , and Diameter Limit Thinning A . Simple Spacing Thinning When thinning on a spacing basis , Contractor will select and leave uncut the largest live conifer trees of good form and vigor that will maintain the average spacing designated in the Unit Description Table . To maintain average spacing , Contractor may not need to cut as many trees immediately adjacent to gaps . However , clumps 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 , 6 ' x 6 ' 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 . Combination of Spacing , Height , and Diameter Thinning When thinning is based on a combination of spacing , height and diameter . The crop trees ( leave trees ) will be based on the size , height , and defect of a particular species . Follow the crop tree leave order in the unit description . For example , if the most desirable crop tree is Douglas - fir ( not counting red cedar ) for a unit , thinning may be done on a 13 ’ x 13 ’ basis or as stated in the unit description , while selecting the largest diameter , tallest , and free of defect crop trees on site . It is more important to retain the healthiest and best crop trees on a 1 / 50th acre plot while also considering spacing than to meet the general spacing requirement ( See clause C - 02 ). However , general spacing guidelines should rarely fall below 8 ’ ( feet ) between crop trees . 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 - 06 Order of Selection of Leave Trees The 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 Unit Description for crop tree order .

Washington

2026-05-01