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HomeMy WebLinkAboutSpecial Report (039) Harlan Bauman ,~~~ RevegetationPlan ~!~:~:¢;~.i,'~:~i~:~,..~:~,~o~~~1 / ~ 701 ~005 Parcel April 2004 Prepared for: Harlan Bamnan 35 Blue Mountain Road Chimacum, WA 98325 3.60 385.6432 dixie ~c able speed, com Harlan Bauman Buffer Reduction And Revegetation Plan Parcel # 701 025 005 April 2004 Contents Introduction Description of Site Applied Methodology Washington State Wetland Identification and Delineation Manual Streams and Streamside Wetland Definitions Jefferson County Unified Development Code Wetland Buffer Definition Standard Buffer Requirements Reducing Buffer Widths Findings Buffer Reduction Re~egetation Plan Buffer Protection Stormwater Control Summary References Sheet # 1 Sheet #2 Sheet # 3 Location Map Existing Conditions Buffer Revegetation Plan Appendix Table #1 Plant List and Landscape Specifications Table #2 Re-seeding Recommendations and Quantities Installation Specifications and Recommendations Harlan Bauman Buffer Reduction And Revegetation Plan Parcel # 701 025 005 April 2004 MLA#A04-00099 Introduction The Department of Community Development is reviewing the proposed 24' X 24' garage by Harlan Bauman for Jeannie R. Klingensmith. Olympic Wetland Resources, Inc. was contacted to review the site since a portion of the structure falls within a 100-foot buffer assigned to a Type 3 Stream. A site assessment was conducted on March 22, 2004. The purpose of the assessment was to locate the mapped stream, assess construction impacts, and evaluate possible buffer reduction possibilities. Ail streams within Jefferson County are subject to requirements outlined in the Jefferson County Unified Development Code (UDC) dated January 1,2001. Land use restrictions will apply to all future developments associated with this parcel. Description of Site Legal Description: Parcel # 701 025 005 Location: 93 Lone Star Road, off Dabob Road (Appendix Sheet #1: Location Map) Soils' AmD Alderwood gravelly loam (Appendix Sheet #1' Soil map) Slopes' 15% to 30% slopes (60% slopes along ravine) A new home has been installed at 93 Lone Star Road. To accommodate an attached garage additional land has been cleared of all vegetation to within 10 feet of the edge a steep ravine. A documented Type 3 Stream, located at the bottom of the ravine has an assigned 100-foot buffer. This impacted area lies within that buffer and measures approximately 35 X 85 feet, (2,800 square feet). During the March assessment water was present in the stream at depths of 3 to 5 inches. The stream has associated wetlands that are confined to within the 9 to 12 feet wide stream bank. The side slopes of the ravine are very steep (30 degree, 60% slope) yet are densely vegetated with native trees, shrubs, and ground cover and no erosion was observed. Applied Methodology The following resources were consulted for this project: Jefferson County Critical Areas Map (Stream and Wetlands) Aerial Photographs Jefferson County Unified Development Code (January 1,2001) Soil Survey of Jefferson County (U.S. Soil Conservation Service 1975) Bauman Stream Buffer Reduction Plan Report File Number 2004-4523 Olympic Wetland Resources, Inc. 4/04 National Wetland Inventory Map Washington State Wetland Identification and Delineation Manual · National List of Plant Species That Occur in Wetlands' Northwest (Region 9) Washington State Wetland Identification and Delineation Manual Fieldwork to determine the presence of wetland boundaries was conducted according to the methodology outlined in the Washington State Wetland Identification and Delineation Manual (Department of Ecology #96-94). Chapter 173-22 of the Washington Administrative Code requires that all wetlands within the State of Washington be delineated using this manual. The methodology outlined in the Washington State Wetland Identification and Delineation Manual requires examination of the three parameters for a positive wetland determination: hydric soils, hydrophytic vegetation, and hydrology. For an area to qualify as a jurisdictional wetland it must have a positive indicator from all three parameters. All wetlands identified using this methodology may be federally regulated, regardless of size. Streams and Streamside Wetland Definitions According to the DOE Washington State Wetland Rating System, Western Washington (Second Edition DOE Manual), a stream channel is defined as "a seasonal flow of water that is predominately in one direction and there is a defined bank or series of banks containing the water." Oftentimes, stream and streamside wetlands are intermingled. If a stream has wetland characteristics, no matter how small, then the entire system is rated as a wetland. Both streams and wetlands have associated buffers as defined by the Jefferson County Critical Areas Ordinance. The larger buffer is the one that is applied. Streams types in Jefferson County are determined using the criteria set forth in the Chapter 222-16-030 .... WAC. This system categorizes streams according to connectivity of larger bodies of water, fish bearing potential, use by humans, and whether the stream flow is seasonal or perennial. The ratings range from Type 1, the highest quality, to Type 5, a seasonal non fish-bearing stream. This stream has been rated as a Type 3 Stream. Jefferson County Unified Development Code (January 2001) Wetland Buffer Definition Section 3.6.9 (2): A designated area adjacent to a wetland that protects, and is integral to the wetland ecosystem. Buffers provide shading, input of organic debris, and coarse sediment, room for variation in the stream or wetland boundaries, habitat to wildlife, and protection from harmful intrusion necessary to protect the public from losses suffered when the functions and values of aquatic resources are degraded. Standard Buffer Requirements 3.6.9 (5 iii): Buffers shall remain naturally vegetated except where the vegetation has been disturbed, invaded by highly undesirable species, or would substantially benefit from the increased diversity of introduced (native) species. Where buffer disturbance has occurred during construction, replanting with native vegetation shall be required. Minor pruning of Bauman Stream Buffer Reduction Plan Report File Number 2004-4523 Olympic Wetland Resources, Inc. 4/04 vegetation to enhance views and removal of undesirable species (e.g. alders) may be permitted by the Director on a case-by-case basis. Reducing Buffer Widths 3.6.9 (6): The Administrator may reduce the standard wetland buffer width, when the project applicant demonstrates both of the following to the satisfaction of the Administrator: i. Standard wetland buffer width averaging as set forth in this section is unfeasible. ii. The project application includes a buffer enhancement plan using native vegetation, which substantiates that an enhanced buffer will improve the functional attributes of the buffer to provide additional protection for the functions and values. Findings The Type 3 Stream is inaccurately mapped (by the Jefferson County Critical Areas Map) and actually is located farther to the west of the site. This stream contains wetlands directly adjacent to the stream channel, which is 9 to 12 feet wide and at the bottom of the ravine. The steep side slopes (60% slopes) of the ravine are densely vegetated and do not appear to be at risk of erosion from the construction project since no vegetation was not removed within 10 feet of the top of the ravine. The buffers were measured perpendicular from the edge of the stream channel (Jefferson County Unified Development Code, Jan. 1, 2001, Section 3 Standard Streamside Buffers Table 3-2). The northern edge of the proposed 24' X 24' garage will fall within the 100-foot buffer. The distance to the proposed building site from the edge of the stream bank is approximately 90 feet. Approximately 2,800 square feet of land has been cleared within 100-foot buffer that should have been left in its natural state. The findings map show existing conditions, stream location (compared to location mapped by Jefferson County), impacted area, and proposed garage location (Appendix Sheet #2). Below is a partial list of vegetation identified on the site. Wetland Plants Scientific Name Common Name Status Layer ~lnus rubra Alder FAC Tree Athyriumfilix-femina Lady fern FAC Herb Blechnum spicant Deer fern FAC+ Fern , 'Lysichiton americanum Skunk cabbage, OBL Herb Rubus spectabilis Salmonberry FAC+ Shrub Thuja plicata Western red cedar FAC Tree .... ToImiea menzeisii Piggy-back plant FAC Herb Upland Plants Acer macro?hyllum Big-leaf maple FACU Tree .. Gaultheria shallon Salal FACU Shrub Polystichum munitum Sword fern FACU Herb Pseudotsuga menziesii Douglas- fir FACU Tree Bauman Stream Buffer Reduction Plan Report File Number 2004-4523 Olympic Wetland Resources, Inc. 4/04 Sambucus racemosa Elderberry FACU Shrub Tsuga heterophylla Hemlock FACU- Tree Vaccinium ovatum Evergreen huckleberry NI Shrub Vaccinium parvifolium Red huckleberry FACU Shrub UPL Upland Species, FACU Facultative Upland Species/Non Wetland, FAC Facultative Species, FACW Facultative Wetland Species, OBL Obligate Wetland Species, NI No Indicator Assigned The qualifier of + or- further defines the stares of the species. Plants classified according to the Fish and Wildlife Service; 1988,1993 Update Buffer Reduction In order to accommodate a feasible site for the garage, this project will require the reduction of the standard 100-foot buffer. The Department of Community Development can authorize a buffer reduction (see 3.6.9 (6) above) on a case-by-case basis. The garage will be approximately 90 feet from the Type 3 Stream bank. The building area is not at risk from flooding due to the depth of the ravine; there is an elevation gain of approximately 30-feet from the stream to the proposed garage site. Likewise there should be no impacts to the stream from the building project due to the density of vegetation between the stream (within the ravine) and the building site. Reducing stream buffers should have no additional impact to any part of this riparian corridor. Due to the impacts of clearing within the 100-foot buffer a revegetation plan will be required as part of a buffer reduction. Revegetation Plan "- The primary goal of this revegetation plan is to minimize further buffer impacts by planting appropriate native trees and shrubs. Trees and shrubs that are currently found on site should be protected during the construction and revegetation process. Secondary goals include increasing species diversity, thereby increasing habitat value for wildlife. The impacted buffer is an area, approximately 85 feet by 35 feet that lies within a flat area at the top of the ravine. After the garage is built the remaining buffer (to the north and west side of the garage) will be planted in native trees and shrubs. The planting plan includes vine maple, shore pine, cedar, hazelnut, red-flowering currant, Oregon grape, and Indian plum (Appendix Sheet #3). Complete landscape specifications are listed including quantities, sizes, optimum locations, and spacing for each plant and all remaining bare areas should be re-seeded with the seed mix included in the (Appendix Table # 1 and Table #2). Plantings can be rearranged to suit landscape and aesthetic choices. Also includes in the Appendix is a directory of local nurseries that supply naive plants and Installation Specifications and Recommendations. It is critical for the success of any newly planted trees and shrubs to be maintained for the first two to three years. Maintenance includes watering and weeding and replacement of plant material that does not survive after the initial planting. Bauman Stream Buffer Reduction Plan Report File Number 2004-4523 Olympic Wetland Resources, Inc. 4/04 Buffer Protection No additional vegetation within the buffer between the garage and the stream will be removed; the preservation of all existing large trees and shrubs in the buffer is critical. Invasive species such as Himalayan blackberry, ivy, or Scot's broom will be controlled and removed from the newly planted buffer. Stormwater Control All storm water from the house and garage will be directed away from the ravine and stream. Sediment or runoff during the construction of the structure should be minimized with the use of straw bales or sediment fences. This will be required during the entire building process and will continue to be required until the vegetation becomes established and can act as a natural filter. A gravel base will be placed on driveways and parking areas. To verify compliance with this planting plan, the project will be approved during the final inspection. Summary A Buffer Reduction and Revegetation Plan are outlined in this report and have been prepared to meet the requirements of the setback approval outlined by the Jefferson County Community Development Department. A field assessment has shown that the proposed garage encroaches on a 100-foot buffer associated with a Type 3 Stream. The stream is located in a densely vegetated steep ravine with 30 degree (60%) slopes with an elevation drop of approximately 30 feet from the flat building site for the garage. The actual location of the structure will be 36 feet back from the top of the ravine and 90 feet from tho edge of the streambed. Buffers will need to be reduced from the assigned 100 feet to 90 feet to accommodate 'the construction of the 24 X 24 foot garage. This buffer reduction is reasonable and falls within the reductions permitted by- the Department. However, a larger area of the buffer has been impacted during the initial clearing for the home site and a revegetation plan is required to mitigate this degradation. No further impacts will result if the post-construction revegetation plan is completed, if best management practices are used during construction, and if stormwater from impervious surfaces is directed away from the steep slopes of the ravine. The primary goal of this plan is to increase overall functions and values of the buffer and to further protect the Type 3 Stream. Compliance with the plan will be verified through inspections during and after construction. The success of this project.will be dependent on ongoing 'maintenance. Final approval of this buffer reduction and revegetation plan falls under the jurisdiction of Jefferson County Depa~rtment of Community Development, Critical Areas Division. ._ Dixie Llewellin Principal Biologist, Olympic Wetland Resources, Inc. Certified for Wetland Delineation, 1987 Manual. Wetland Training Institute, June 1995. Bauman Stream Buffer Reduction Plan Report File Number 2004-4523 Olympic Wetland Resources, Inc. 4/04 References Buckingham, et al., 1995. Flora of the Olympic Peninsula. Northwest Interpretive Association and the Washington Native Plant Society, Seattle, Wash. Cooke, Sarah Spear, 1997. A Field Guide to the Common Wetland Plants of Western - Washington and Northwest Oregon. Seattle Audubon Society, Seattle, Wash. Cowardin, L.M.V. Carter, F.C.Goblet, and E.T. LaRoe, 1979. Classification of Wetland and Deep Water ltabitats of the U.S.U.S. Fish and Wildlife Service, Washington, D.C. Hitchcock and Conquest, 1973. Flora of the Pacific Northwest. Federal Interagency Committee for Wetland Delineation, 1987. Federal Manual for Identifying and Delineating Jurisdictional Wetlands. July 1994 update. U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, and U.S.D.A. Soil Conservation Service. Jefferson County Unified Development Code. January 2001. Leonard, William P., 1993. Amphibians of Washington and Oregon. Seattle Audubon Series. MacBeth, Div. of Kollmorgen Instruments Corp., 1992. Munsell Soil Color Charts. Mitsch and Gosselink, 1993. Wetlands. Pojar, Mackinnon, 1994. Plants of the Pacific Northwest Coast. Reed, Porter, 1988. National List of Plant Species That Occur in Wetlands, Region 9. 1993 update. Washington State Wetland Department of Ecology, March 1997. Washington State Wetland Identification and Delineation Manual, #96-94. U.S. Department of Agriculture, 1994. Keys to Soil Taxonomy. Pocahontas Press. U.S. Department of Agriculture, Soil Conservation Service, 1975. Soil Survey of Jefferson County. Appendix Sheet #1 Location Map Sheet/t2 Existing Conditions Sheet # 3 Buffer Revegetation Plan Table 1 Plant List and Landscape Specifications Table//2 Re-seeding Recommendations and Quantities Installation Specifications and Recommendations ~'~-~ ~;,~ OlympicWetlond Resources, Inc. PortTow, send, '? 360 385-6~ . .... '"ii.., d~ie@coblespeed.com CEnt: Location Map Parcel # 701 025 005 Harlan Bauman for Klingensmith 93 Lone Star Quilcene, WA 981 77 i i i ' '.,.[::: !!i ...... ' ;"'- .. As Indicated April 2004 Job #: 2004-4523 She~ #1 Subject Property WG$1]4 I22°34,000' W 122°5;1,000, W 122°4G.000' W I22o45.000' W 122042.000' W 0 ! 2 I ,3,! ,4~ I~..h..I. ,.t...l... I... I... h~.].., h..t ..... , :...:...J...~ .... 0 1 2 3 4 ~ 6 7lcm 122o39.000' W WGS84 122034.000' W ~"~:. 'i? ': Olympic Wetland Resources, inc. -,~.. ~? Po~tT0~se~l, WA 98368 .., lixie@coblespeed ..~.. .corn iiii Existing Conditons Parcel Cf 7 01 025 005 Harlan Bauman for Kiingensmith 93 Lone Star ©uilcene, WA 98177 As Indicated 1Sheet April 2004 Job #: 2004-4523 //2 Native Vegetation Impacted Area ---85' X 51' Ravine with Type 3 100' Buffer From Stream Stream As Mapped b~y Jefferson Coun 24X24 Proposed Garage 100' Buffer Top of Ravine Site Locatiod Lone~ i i '~ -'"~,,~ Olvmnic Wedand Resources, Inc. ~..., .. ~ ..~ ~ -..- /'"~:t~¢~: Port Townsend, WA 98368 iiii i i i Client: i i iii i i i Buffer Revegetation Plan Parcel #701 025 005 Hartan Bauman for Kiingenmdth 93 Lone Star Quiicene, WA 981 7 7 i i i i Stole: Sheet As Indicated April 2004 //3 Job #: 2004-4523 I $ Top of Ravine Proposed Garage SVine Maple (8) $ Shore Pines (6) Hazelnut (5) Indian Plum (5) Oregon C~.ape (5) t Cedar (6) t Red-floweringcurrant (5) 0 0 r- ! ~ ~..-~:~.--~..-..-~5 .... - ................. ~ ii::!!Jii?~!~!',¢i~:::ii!:;i ii~',!ii',~;!iii~'i,~iiii¢ ......................... ====================== .............. -:.:::.:-<::. ...... ............... ::i:i:i:-::~:-'.:~,i:.<:i:?. :.:.:.:....:_:.:.:+:.:.:.:.:.: E ~.E ~ =~'~' .......... .............. ......................... ............................... :.::============================= ......................... !:!:!:!!?!'?!:!?!! ........................... ....... .:::::::::: ::!!~:~:.::~ ................. .: ............. ::::::::::::::::::::::::::::::: Installation Specifications and Recommendations All areas of exposed soil will be revegetated with species known to tolerate local soils and conditions. Individual plant species have been selected because they have a high habitat value, are consistent with surrounding vegetation, and are known to thrive in east Jefferson County. Fall Installation Planting should be installed between mid-September and mid-November, unless the new plantings can be watered throughout the summer. Plantings installed in the fall generally outperform those installed in the late winter or spring. Plants put in the ground in the fall have the advantage of an extended period for root growth before rapid top growth in the spring. In the fall, the soil is warmer and more aerated than in the spring and most plants experience active root growth during this time. The cool, cloudy days and frequent precipitation of fall and winter also provide ideal transplanting conditions. Until sufficient root systems develop, newly installed plants will undergo transplanting stress that can be exacerbated by hot sunny days. Fall and winter weather allows for reduced transpiration and provides ample moisture for the roots while the plant recovers from transplant shock. Root Disturbance Immediately before installation plants with broken, damaged, or twisted roots must be pruned. Matted or circling roots of containerized plantings must be pruned or straightened and the sides of the root ball must be roughened from top to bottom to a depth of approximately half an inch in two to four places. If circling roots are left, they may eventually girdle the plant as they grow and thicken in place. If the roots at the edge of the root ball are straightened and extended, they will have access to a greater volume of soil in the planting hole. Also, the roughened edges of the root ball will have better contact with the backfill soil. Disturbing and removing one-fourth to one-half of the roots in the outer inch of the root ball will damage only the most sensitive plants; most often, this treatment actually stimulates increased plant growth. Plant Depth The finished height of each plant's root ball will be slightly higher than that of the surrounding soil. The exception is for sandy soils, in which case the soil heights will be even. The top of the root ball will not be covered with back~ill soil. A watering basin will be formed around each planting by building a berm of soil at least 30 inches in diameter. When planting a container-grown plant, the top of the root ball should not be covered with any other soil. Coveting the root ball with soil, particularly if it has a finer texture than the potting or field-growing soil, will generally cause water to flow around the root ball instead of into it; root balls covered in this way may receive water only from below. To allow direct wetting of the root ball from above, install the plant so that the top of the nursery soil is slightly higher than the surrounding soil level. If the soil is sandy, or of a large particle size, then the nursery soil should be level with the surrounding soil. A watering basin made of mounded soil around each planting will further help to catch water from above--the berm should be at least 30 inches in diameter surrounding a plant. Mulch placed within the basin and on the berm will limit moisture loss from the root ball and surrounding soil, but take care that it does not come into contact with the stem of the plant as rodents or pathogens living in the mulch may attack the bark. Re-seeding After the completion of the construction and planting projects, a seed mix (included in Table 1.) will be evenly spread on all bare areas. An inspection by a wetland biologist or Critical Areas staff of Jefferson County Department of Community Development will be required after all planting is completed. Maintenance: Weeding and Irrigation The use of appropriate native species and careful planting ensures that the need for ongoing maintenance will be minimized. However, some maintenance is required to ensure that the young plants become established. It is recommended that weeding around new plants be conducted once or twice a year during the months of May and September for the first five years, and as often as needed after that. All Scot's broom, Himalayan blackberry, and thistle should be monitored and eliminated from the site. Irrigation may be required for upland species (vine maple, red-flowering currant, and pine) for the first three years or until plants are well established. Hand watering or irrigating with overhead sprinklers once a week should be adequate during the hot summer months. Wetland species that are planted near the creek corridor may require less watering.