significant tree inventory report spencer plat poulsbo, wa...american forest management inc. was...

11415 NE 128th St., Suite 110, Kirkland, WA 98034 | Phone: 425.820.3420 | Fax: 425.820.3437 | americanforestmanagement.com

Significant Tree Inventory Report

Spencer Plat

Poulsbo, WA

February 19, 2019

Prepared by:

American Forest Management, Inc.

American Forest Management, Inc. 2/19/2019

Table of Contents

1. Introduction .............................................................................................................. 1 2. Description ............................................................................................................... 1 3. Methodology ............................................................................................................ 1 4. Observations ........................................................................................................... 1 4. Significant Tree Inventory ........................................................................................ 2 5. Tree Retention Summary ......................................................................................... 3

Supporting Information Tree Inventory Map Tree Inventory Map with Site Plan Backdrop

Spencer Plat – Significant Tree Inventory

Page 1 American Forest Management, Inc. 2/19/2019

1. Introduction American Forest Management Inc. was contacted by Timothy Witten with Team 4 Engineering and asked to conduct an inventory of significant trees on the proposed Spencer Plat in Poulsbo, WA. Our assignment is to perform an inventory of significant trees within the ownership and to report on the number of significant trees; and the general condition of the subject trees found therein. The purpose of the report is to estimate the number of significant trees to develop a baseline for tree retention calculations. Date of Field Examination: February 14, 2019

2. Description The study area encompasses approximately 20 acres. The area includes Kitsap County parcel 102601-2-004-2005, with a physical address of 21989 Urdahl Road. There is currently one house structure on the property with multiple outbuildings. The majority of the property was logged in the early 2000’s. Approximately 90% of the timber was harvested leaving scattered residual trees. There are groupings of older residual trees on the east portion of the property, totaling a few acres. For the purposes of this report, a significant tree is considered any tree greater than 10” DBH (diameter at breast height, 4 ½’ above ground).

3. Methodology The portion of the property that was logged over in the early 2000’s contains predominantly non-significant trees, or trees less than 10 inches in diameter. We used historical aerial imagery taken in 2003 to map the residual trees left after the timber harvest. This was done using a technique called heads-up digitizing. We then performed a thorough field reconnaissance to verify the accuracy of the mapping. The produced map is geo-referenced. We used the Avenza PDF Map application to verify the locations of residual significant trees. The initial mapping was fairly accurate, however a fair portion of the residual trees left after harvest have since died, mostly in the western portion of the property We made edits to the maps in the field and later corrected the significant tree locations using ArcInfo GIS. The residual groupings of trees located in the eastern portions of the property were counted, by area. Subject areas are shown on the attached map. These areas were delineated based on tree density and size of trees. We collected species and size information for significant trees. Dead trees were not counted.

4. Observations Much of the ownership, 16.23 GIS acres, was logged roughly 15 years ago (Area 7). Scattered trees and small groupings of trees were retained during that timber harvest. These include primarily smaller Douglas fir with a moderate component of Western red cedar and minor component of Western hemlock and Western white pine. Residual significant trees are small and mostly in the 10” to 15” diameter range. There is considerable non-significant natural regeneration of Douglas fir and red alder in the areas that were harvested. The Douglas fir is in fairly good condition. No indicators of root disease were identified on the property. The cedar is also in fairly good condition and of normal vigor. The hemlock is in poor condition overall. Lots of hemlock mortality was observed. The pine is in fair to poor condition. Much of the pine is infected with white pine blister rust. A large area of recently dead pine was observed in the northwest portion of the site. The mapped areas on the east portion of the property are primarily comprised of Douglas fir. These areas total 3.33 GIS Acres. Areas 1 and 2 have a moderate component of Western red cedar. Most areas have a minor component of Western hemlock, pacific madrone and Western white pine. There are a few scattered deciduous trees amongst the areas to include bigleaf maple, cottonwood and Scouler’s willow.



No concerning forest health conditions were observed in the residual treed areas. Trees are displaying normal vigor. Some of the hemlock is in decline, likely from past summer drought conditions.

4. Significant Tree Inventory The plot data is summarized in the tables below by Area. The areas are shown on the attached map.

Area 1 - 0.87 AcresDiameter (inches) Total by

Species 10-11 12-13 14-15 16-17 18-19 20-21 22-23 24-25 26-27 28-29 30-32 SpeciesDouglas-fir 25 15 14 16 4 2 1 2 1 80Western Red Cedar 6 3 5 3 2 1 1 1 1 23W. White Pine 1 2 1 1 5Bigleaf Maple 1 1Pacific madrone 1 2 3Scouler's willow 1 1Total by Diameter 32 21 21 21 7 4 1 2 0 3 1 113

Area 2 - 0.92 acresDiameter (inches) Total by

Species 10-11 12-13 14-15 16-17 18-19 20-21 22-23 24-25 26-27 28-29 30-32 SpeciesDouglas-fir 23 28 23 25 10 6 5 1 1 1 3 126Western Hemlock 1 2 1 1 5Western Red Cedar 8 2 4 1 3 18Pacific madrone 1 1 2Total by Diameter 32 31 29 27 11 7 5 4 1 1 3 151


Species 10-11 12-13 14-15 16-17 18-19 20-21 22-23 24-25 26-27 28-29 30-32 SpeciesDouglas-fir 17 17 14 15 9 5 3 2 3 85Western Hemlock 2 2 4Western Red Cedar 1 1 2Pacific madrone 1 1Total by Diameter 19 20 15 15 9 5 0 3 2 1 3 92


Species 10-11 12-13 14-15 16-17 18-19 20-21 22-23 24-25 26-27 28-29 30-32 SpeciesDouglas-fir 37 11 4 1 53Western Hemlock 2 2Western Red Cedar 1 1 2W. White Pine 1 1 2 4Total by Diameter 40 13 7 1 0 0 0 0 0 0 0 61


Species 10-11 12-13 14-15 16-17 18-19 20-21 22-23 24-25 26-27 28-29 30-32 SpeciesDouglas-fir 1 3 9 8 2 2 25Pacific madrone 1 1Cottonwood 1 1 2Total by Diameter 2 3 9 9 2 3 0 0 0 0 0 28


Species 10-11 12-13 14-15 16-17 18-19 20-21 22-23 24-25 26-27 28-29 30-32 SpeciesDouglas-fir 21 10 5 3 1 1 41Western Red Cedar 2 2 2 1 7W. White Pine 1 2 1 4Total by Diameter 24 14 6 5 1 2 0 0 0 0 0 52



Area 7 – 16.23 has an estimated total of 952 significant trees. Summary of Counted Areas 497 significant trees over 3.33 acres = 149 trees per acre

5. Tree Retention Summary Area 1 contains 113 significant trees. Area 2 contains 151 significant trees. Area 3 contains 92 significant trees. Area 4 contains 61 significant trees. Area 5 contains 28 significant trees. Area 6 contains 52 significant trees. Area 7 contains 952 significant trees. The total number of estimated significant trees over the entire property = 1,449 City Code requires the retention of 25% of significant trees. Trees required for retention = 363 Estimated Retention by Area West 25-foot Perimeter Buffer – Area 3 (0.18 acres) = 23 Trees West 25-foot Perimeter Buffer – Area 4 (0.17 acres) = 25 Trees West Perimeter Buffer – Area 6 (0.12 acres) = 17 Trees North 25-foot Perimeter Buffer – Area 7 - Estimate of 42 Trees East 25-foot Perimeter Buffer – Area 7 - Estimate of 16 Trees Tract A – 50-foot Perimeter Buffer = Estimate of 28 Trees Tract F – Estimate of 8 Trees

Total Estimated Sum of Retained Trees = 159 There are many non-significant size trees within the proposed retention area. Per the retention code below, B2, the review authority may allow these to count toward the retention requirement. These non-significant trees would satisfy the requirements as outlined in subsection A below. 18.180.030 Retention required. A. In applying the requirement for retention of trees, the review authority shall consider the preservation of trees in any of the following circumstances as priorities: 1. Trees located within healthy, vegetated groups and stands, rather than as isolated trees scattered throughout the site. 2. Trees that have a reasonable chance of survival once the site is developed. 3. Trees that can be incorporated into required landscaping and setback areas.



4. Trees adjacent to required critical area buffers. 5. Trees having a land stability function. 6. Trees that can be incorporated into a perimeter buffer or screen the site from adjacent properties. 7. Trees that can be incorporated into required open space and/or recreational amenity areas or tracts. 8. Trees that will not pose a threat to persons or properties. 9. Conifers which provide for superior ability to intercept stormwater during high rain events over deciduous trees. B. Tree Retention Requirement. 1. At least twenty-five percent of the existing trees which are ten inches in diameter or greater measured four feet six inches above grade, and meet the priorities in subsection A of this section, shall be retained. 2. The review authority may approve retention of trees which do not meet the size requirement above as a contribution toward the sum of the diameter inches required if a group of trees and its associated undergrowth can be preserved and falls within one of the priorities identified in subsection A of this section. (Ord. 2016-20 § 2 (Att. A (part)), 2016; Ord. 2013-04 § 2 (Exh. A (part)), 2013)

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77

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Spencer PlatSec 9 - T 26 N, R 1 E, Kitsap County

0 200 Feet1 inch = 200 feet Map date: 2/15/2019

TREE LOCATIONS

!. Tree (10" dia.)Cover type boundary

significant tree inventory report spencer plat poulsbo, wa...american forest management inc. was...

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