Loading...
HomeMy WebLinkAboutCritical Area Assessment 960300021CouNTY DCCT Introduction Olympic Wetland Resources, Inc. Dixie Llewellin, Principal Biologist 856 50th Street Port Townsend, WA 98368 360 385-6432 dixie@cablespeed.com Walker Revegetation Plan No Net Loss Critical Area Assessment Parcel #960 300 021 May 2018 As requested by Simon Little, studio STL a final planting plan and landscape specification are outlined in this report. This report follows the Walker Remodel No Net Loss Critical Area Assessment (December 2013 and the Revision March 2014) by Olympic Wetland Resources. The original plan (December 2013) was to remodel an older 1,595 sqft home built in 1958 and increase the impervious surface by 725 sqft. The new construction was within the shoreline designated Fish and Wildlife Habitat Conservation Areas (FWCHs) that measures 150 feet from the shoreline of the Ordinary High Water Mark (OHWM) of Oak Bay. Part of the mitigation included the removal of existing asphalt and revegetating additional impervious surfaces with native vegetation. The area between the original house and shoreline, consisting of mowed lawn has little habitat diversity and is the focus of the mitigation. The No Net Loss Critical Area Assessment was revised March 2014 when the building plan for the Walker residence was enlarged. The home was planned to increase by 2,033 sqft with a design extending 3 directions and including a deck on the waterward side of the house. This change required a larger mitigation area. The final area to be mitigated is calculated at over 913 sqft. The original building permit was issued in 2014 prior to updating of the Shoreline Master Program and will be vested under the previous codes. No Net Loss Goals and Objectives The goals and objectives for this project include: • No Net Loss of ecological shoreline functions once construction is complete; • to mitigate construction impacts from the remodel of a single-family residence within the FWCHs buffer of Oak Bay (greater than 913 sqft,); • to re -vegetate an area greater than the impacted area with 3 native trees and 24 native shrubs, 30 small woody/herbaceous plants and grass plugs I; • to submit an AS BUILT report to Jefferson County DCD after final construction and plants are installed. Trees calculated at 100 sqft cover, shrubs at 20 to 25 sqft cover and woody/herbaceous grasses and herbs at I sqft cover. Walker Revegetation Plan May 2018 Mitigation Area The mitigation sites for the Walker remodel has been chosen to enhance shoreline species diversity, enhance buffers, and improve areas degraded area during construction. Revegetation locations are indicated in the Revegetation Plan (Sheet 1). The landscape design can be altered by the Walkers to coincide with future paths or additional design features. Additional species can be added to include flowers including columbine and camas but are not part of this mitigation. Methodology Mitigation requirements have been prepared to meet the standards described in the Department of Ecology, Guidance on Wetland Mitigation in the State of Washington State (March 2006 #06-06-11 A) and in accordance with prescribed requirements outlined by Jefferson County Unified Development Code, Critical Areas, Article IX 18.22.270 (FWHA). Revegetation Prior to planting the native trees and shrubs the compacted soils must be amended. It is recommended that topsoil and compost be incorporated into the soils to at least a 10" deep and top mulch be added to the plants. Deer grazing on young plants may be a problem and simple fencing can help solve this problem until the plants become established. Appropriate native trees and shrubs have been chosen according suggestions by the Walkers and past recommendations. Most species are chosen to tolerate salt spray and coastal site conditions. Over time planted species will function as additional habitat layers for wildlife and define shoreline buffers. Landscape Specifications Landscape Plan For Walker Remodel Scientific Name Common Name Size Spacing Quantity —sgft Type Location Acer circinatum Vine maple 2 gal 8' 4 100 Shrub Arctostaphylos uva-ursi Kinnikinnick 4" pot 6" 20 20 Shrub* —Upland Berberis aquifolium Shiny Oregon grape 1 gal 3' 5 100 Shrub —Upland Coastal Frageria chiloensis Coastal strawberry 4" pot 6" 30 30 Herb Coastal Leymus mollis Dune grass plug 10" 100 100 Grass Coastal Pinus contorta Shore pine 2 gal 6 to 8' 3 300 Tree Coastal Rhododendron macrophyllum Pacific rhododendron 1 gal 4 to 6' 5 100 Shrub Upland Ribes sanquineum Red -flowering currant 1 gal 3 to 5' 7 150 Shrub Upland Rosa nutkaensis Nutka Rose 1 gal 4' S 1 100 1 ShrubJ Coastal 1000 * Woody small plant Small Shrubs are calculated at 20 sqft per plant, larger shrubs at 25 sgft per plant. Fourth Corner Nurseries, 3057 E. Bakerview Road Bellingham WA (360) 734-0079 Sound Native Plants, P.O. Box 7505, Olympia, WA 98507 (360) 943-7026 Woodbrook Nursery, 1620 59th Ave. Gig Harbor WA 98335 (206) 265-6271 Upland plants are less tolerant to salt spray. 2 Walker Revegetation Plan May 2018 Installation and Maintenance All plant material should come from healthy plants grown in containers as specified; healthy bare root trees can also be used. It is desirable to obtain plants that are adapted to this region and propagated in local nurseries. The use of appropriate native species ensures that ongoing maintenance is minimized once the plants are established. All new plantings must become established to successfully out - compete non-native species. It is recommended to install new plants in the fall so roots can become established during the winter. Nursery specimens should be planted in dense groupings. In general, trees should be planted 8 to 10 feet apart and shrubs 3 to 5 feet apart. Native plant design encourages grouping of species in clusters to mimic the natural surroundings, rather than in rows or grids. Installing mulch circles (bark, wood chips, compost) to 3" deep and a minimum of 3 feet in diameter around each tree and shrub is recommended. Mulch circles help woody specimens become established by preserving moisture and reducing competition for nutrients from grasses. Success rates of a restoration project are greatly improved when commercial tree protectors are used on newly planted trees and shrubs. With this added protection mortality is reduced during weeding and deer grazing. Irrigation may be required for the success of planted species through the dry summer months. If the planted species appear to be stressed in the summer months they must be irrigated. Trees and shrubs require a minimum of 1 inch of water per week or 2 inches every two weeks from July through September. Irrigation systems are expensive and hand watering could be done to ensure that the new trees and shrubs get enough water until they are established. AS BUILT PLAN As required by No Net Loss revegetation projects, an AS BUILT PLAN will be submitted to Jefferson County after the remodel has been built and the revegetation project is complete. The report will include the final location of tree and shrub species. After the report is submitted, the site will be inspected by the wetland specialist of Jefferson County Department of Community Development. Optional Monitoring To ensure the success rate of this project annual monitoring is recommended. This will determine the survival rate of planted species over time and help determine survival rates. Recommended Performance Standards for a revegetation project are as follows: • Survivorship of installed tree and shrub species is expected to be 100% after the first growing season. All plants that do not survive the first year should be replanted. • Survivorship of installed tree and shrub species is expected to be 80% from year 2 through year 5. Species will be replanted until the monitoring period is complete. • This No Net Loss is considered successful if 80% or greater of desirable cover is achieved and the plants are healthy and vigorous during the fifth year of monitoring. Desirable species also include volunteer native trees and shrubs. • No more than 10% invasive species should be present at any time during the monitoring process. Non -desirable species include Scots' broom, English Ivy, and Himalayan blackberry. Walker Revegetation Plan May 2018 Summary This report represents the mitigation and Revegetation Plan for the Walker remodel at 71 Oak Road, Port Hadlock WA. The original design December 2013 and the revised plan March 2014 will require the mitigation of over 900 sqft for added impervious surface within the FWHCs buffer. The shoreline of Oak Bay will be enhanced after native species are planted and established. Over time they will increase structural and habitat diversity within an area that is currently mowed lawn. The back of the house facing Oak Bay will be re -vegetated with native species known to adapt to shoreline conditions. Native evergreen shore pines, native shrubs and dune grasses will enhance a site that is currently mowed lawn. The front of the house along Oak Road that was once asphalt will be planted in rhododendrons, vine maples and red -flowering currants. The original building permit was issued prior to the updating of the Shoreline Master Program; the project is vested under the previous codes. The No Net Loss and Critical Area Assessment project will require an AS BUILT report and inspection by the Jefferson County staff biologist. Optional ongoing monitoring will ensure the success of this project. If Performance Standards outlined in this report are met there will be no net loss of ecological functions. Limitations The final authority over the Walker Critical Area Assessment and No Net Loss Report will be Jefferson County Department of Community Development. Jurisdictional authority over shorelines rests with the local, state and federal agencies. All information in this report should be reviewed by the appropriate regulatory agencies prior to approval. If there are further questions or planning requirements, please do not hesitate to call. Respectfully s Dixie Llewellin dixie@cablespeed.com Principal Biologist, Olympic Wetland Resources, LLC Certified for Wetland Delineation, WTI Certified for Wetland Rating and Soil Analysis DOE, 2007, 2012, 2014 4 Walker Revegetation Plan May 2018 Olympic Wetland Resources, LLC 856 50th Street Port Townsend, WA 98368 360 385-6432 dixie@cablespeed.com Base Map by studio STL Vine Maple (4) J"O Kinnikinnick (20) Oregon Grape (5) Coastal Strawberry (30) Dune grass (100) Shore Pine (3) Pacific rhododendron (5) ' Red Flowering Currant (7) Nutka rose (5) Title: Revegetation Plan 71 Oak Road Port Hadlock,WA 98339 Client: Thomas and Katherine Walker 612 14th Street Kirkland,WA 98033 Scale: Sheet As Indicated Date: May 2018 # 1 Job #: 2014-0108 Parcel #960 300 021 1 (E) BuiLDN6 Jf POOTPTRINT `,, M) BUILPNc5 �.. I"NT s r 5Lr►B (N) PECK r ! �Y�fE f rr (N) [)ECK (N) BUILDN6 fiC30TPrlc 1 � r r-00TPr-ll Stu CI I OSTL studio-stl.com TRANSMITTAL & REQUEST PROJECT: Walker Residence BLD 0&f*0926F;-XA* 17 Z 95 71 Oak Road, Port Hadlock, WA 98339 DATE: 06/14/18 DOCUMENTS: Walker Revegetation Plan / No Net Loss Critical Area Assessment DESCRIPTION: This transmittal is accompanying the submission of a revised Revegetation Plan as part of a No Net Loss Critical Area Assessment for parcel #960300021. Items to note are the revised proposed planting areas that have taken the actual area of impact into consideration, also revised is the planting plan. REQUEST: The project is scheduled to be complete in July of 2018. The owners are requesting an extension on the requirement of implementing the planting plan until the fall planting season, October 2018. Thank you, Simon Little Page I 1