Loading...
HomeMy WebLinkAboutPlanting and Mitigation Plan 602264017W C ~ z m�! .21 O W I G O �k �mG� gg O }t � Z 2 h 1.3 RZ 2 C� P Sd w o d 47g _0 6 eo OVOtI moot! 7►"3S r. E L da 1CLNno") NOS2i3_i:I:'S OZOZ 61 83A 0 +? Z 1.0 PROJECT LOCATION This project is located at 871 Seal Rock Road in the Brinnon area of Jefferson County, Washington. The Tax Parcel Number is 602264017 and it is situated in the SE 1/4 of Section 26, Township 26 N, Range 2 W. WM. The parcel lies across the end of Seal Rock Road immediately north of the Olympic National Forest, Seal Rock Campground. This report documents conditions and the proposed activities on the shoreline portion of the parcel, which lies east of Seal Rock Road. 2.0 SITE DESCRIPTION This parcel is currently developed with a waterfront cabin along the shoreline east of Seal Rock Road and garage and septic system on the upland east of the road (Photo 5). The cabin sits on sloping terrain that begins at the road and extends to the concrete bulkhead along the shoreline (Photos 2-6). There are two sections of bulkhead that are separated by the concrete boat ramp that leads from the basement boat shed to the beach (Photo 15 and 16). The southern bulkhead is squared off around the southeast corner of the cabin (Photos 10-12) and is perpendicular to the upland shoreline that begins about 8 feet south of the cabin (Photos 7- 9). The northern bulkhead lies perpendicular to the shoreline beginning at the boat ramp and lies parallel to the shoreline. This bulkhead, which also represents the ordinary high water mark, is about 18 feet from the cabin and extends to the boat ramp that lies adjacent to the home just off -site to the north (Photos 1 and 2). There is a lip at the top of the southern bulkhead that extends out over the shoreline and the lower portion extends beyond the lip across the shoreline (Photos 10-12). The northern bulkhead extends vertically from the shoreline and there is no lip at the top or excess concrete at the base of the bulkhead (Photo #13). The cabin sits across the south half of the waterfront portion of this parcel while a mowed lawn and deck are on the north half (Photos 1 and 2). A small fire pit is located just landward of the northern bulkhead and north of the house. Most of the area around the house and above the bulkhead is concrete including the slope under the existing deck (Photos 14- 17). The shoreline area is composed of rocky material with small rocks to a few larger rocks throughout (Photos 10, 12 and 13). There is no woody vegetation anywhere on the waterfront portion of this parcel except along the road where there is English ivy covering such native shrubs as salmonberry, Indian plum and salal (Photos 4 and 5). There is also some ivy growing in a strip along the transition between the lawn and concrete covered areas (Photos 2 and 3). The soil within the lawn area was not examined for existing conditions but it appears that it is currently heavily compacted due to long time usage. The soil material within the proposed enhancement area (along the shoreline) could not be examined because of the existing concrete patios. It is assumed that the soils beneath concrete are severely compacted due to the long time presence of the concrete. The ground is generally flat within 8 to 10 feet of the existing bulkheads to the footprint of the cabin with a gradual slope up to the west line. The 1 terrain is flat across Seal Rock Road and the western portion of this parcel slopes gradually up to the west. The slope is vertical from the top of the bulkheads to the shoreline community. The shoreline slope south of the house and outside the bulkheads is vertical and there is some danger of slides during heavy storm events due to the lack of vegetation (upper edge of Photo #10) but does not pose a danger to the existing home, Seal Rock Road or the existing bulkheads. 3.0 PROJECT DESCRIPTION The cabin is in a dilapidated condition and replacement is proposed. The replacement will involve utilizing much of the existing footprint and/or existing concrete covered areas by moving the cabin about 8 feet to the north where it will cover the northern portion of the existing deck and all but 8 feet of the existing cabin footprint (see Figure 1 for site plan prepared by David Vandervort Architects, August 2008). The cabin will also go up vertically to create a loft area above the main floor. The required shoreline setback is 30 feet and because the cabin currently exists within the required setback, averaging using the properties adjacent to the project site is proposed as a means to determine a suitable setback for the cabin. The existing home on the adjacent north parcel is 6 feet from the shoreline and the adjacent south parcel is currently undeveloped so it requires a 30 foot setback. The setback for this parcel is therefore 18 feet when the two off -site setbacks are averaged. The existing cabin is currently 18 feet from the northern bulkhead and is 8 feet from the southern bulkhead. Moving the cabin an additional 8 feet to the north will give the replacement cabin a setback of 16 feet from the southern bulkhead and because it is being moved perpendicular to the northern bulkhead, it will remain at least 18 feet from the shoreline. The second story loft is proposed outside the 18 foot shoreline setback. As part of the project proposal, the concrete patios that exist landward of the bulkheads will be removed so that topsoil can be spread and native trees and shrubs installed just landward of the bulkhead. The bulkheads will remain in place because they are currently providing much needed protection for the house and altering their location could have severe impact on the current and future cabin. The boat ramp will also remain in its present location and in its present condition, which will allow its continued use once the new cabin has been constructed. The doors to the basement boat shed will remain in the current location but will be at the south end of the cabin rather than roughly in the center. A walking path is proposed in the shoreline setback to provide access to the shoreline and for cabin and vegetation maintenance. 4.0 CRITICAL AREAS MAPPING 4.1 Department of Natural Resources, Water Type Inventory. The Department of Natural Resources, Water Type Inventory, Forest Practices Activities Resource Services designates the shoreline portion of this site as a Type S water. A stream system is mapped off -site to the north that is a Non -Fish Habitat OA stream that is greater than 300 feet from the project site. There are no other water types in the area of this project site. See Figure 2 for site located on the Water Type Inventory Map. 4.2 National Wetlands Inventory The US Fish and Wildlife Service, National Wetlands Inventory as viewed through the Wetlands Mapper indicates the shoreline portion of this site as Estuarine, Intertidal, Aquatic Bed/Unconsolidated Shoreline, Regularly flooded (E2AB/USN), which is not considered wetland. There are no freshwater or estuarine wetlands mapped within 300 feet of the project boundaries. See Figure 3 for site located on the National Wetlands Inventory. 4.3 Jefferson County Critical Area and Habitat Mapping The Jefferson County Critical Area and Habitat Maps viewed through the on-line mapping server indicate the presence of wildlife habitat in the Seal Rock Road area that includes this site, which is located near the center of the mapping. The mapping also includes Seal Rock Campground off -site to the south and a portion of the shoreline community. The mapping does not indicate the presence of wetlands or other critical habitats within 300 feet of the project site and it does not indicate species specific habitat. See Figure 4 for site located on the Jefferson County Critical Area and Habitat Map. 4.4 Critical Areas Identification, On -Site Review Since the project involves replacement of the shoreline cabin, only the shoreline portion of this property was examined for the presence of wetlands and streams. No freshwater wetlands were identified on the property as there were no areas where wetland hydrology was present or hydrophytic vegetation was dominant. The shoreline community is composed of tidally influenced rocky shore that is composed of cobble sized rocks and a few larger rocks (Photos 10, 12 and 13). There are no vegetated or un-vegetated mudflat areas on this or the adjacent properties with the upland community to the south dominated by a coniferous forest. There is a large pipe extending onto the shoreline area from under Seal Rock Road that appears to convey runoff from Highway 101, which lies several hundred feet to the west of the site (Photo #9). There is no evidence to indicate a historic stream drainage or critical habitat in this area. 5.0 POTENTIAL IMPACTS OF PROPOSED DEVELOPMENT The project as currently proposed will not have any adverse impacts to the shoreline environment of Hood Canal because it proposes replacement of the existing cabin within the existing footprint of the cabin and the north deck. Concrete covers the slope below the existing deck so placing the home over the deck will not result in new impervious surface that could affect the water quality within Hood Canal. No new areas of impervious surface are proposed and in fact, there will be less impervious surface as the concrete patios will be removed from above the bulkheads. A loft will be constructed as a partial second story 3 outside the averaged shoreline setback. Enhancement is proposed within 10 feet of the shoreline to include removal of the concrete patios and replacement with topsoil in which native vegetation will be planted. The bulkheads will remain in their existing locations and in their current condition so the plantings will mainly function to soften the shoreline edge and provide some noise and light screening of the cabin from the shoreline community. The lawn will remain largely unplanted so as to maintain some existing outdoor recreation areas to include the fire pit with only a few plants proposed immediately adjacent to the bulkhead. The parcel will continue to be used as a single family residence and no changes are proposed that will affect neighboring parcels with regard to usage of common areas on those adjacent parcels. 6.0 SHORELINE ENHANCEMENT PLAN 6.1 Goals of the Shoreline Setback Enhancement Typically, the goal of setback or buffer enhancement is to improve the vegetation community so that it provides a more protective buffer than current site conditions allow. In the case of this project, the vegetation is proposed mostly as a screen that will provide noise and light protection for the shoreline community from the existing cabin once it is remodeled. There will be no over -shore shading provided by the installed plants because they are proposed above the vertical bulkhead and the species selected will mostly grow vertically and not horizontally over the shoreline. Therefore, the goal of this enhancement is to improve the protective nature of the existing concrete patios by removing the concrete, spreading topsoil throughout and installing native plants that will provide noise and light screening for the adjacent critical area. To achieve this goal, four shrub and a single conifer species will be installed mostly between the walking path and bulkheads and they will be planted to provide a multilayer community. Evergreen species such as Oregon grape and shore pine will provide year round screening and while the deciduous shrubs die back during winter, the species selected have the tendency to form dense thickets and/or spread quickly. Low growing shrubs such as salal are proposed along the exposed bare slope just south of the home to help stabilize the soils and minimize erosion impacts. 6.2 Shoreline Setback Widths and Final Contours The required shoreline setback width is 30 feet and through the averaging process the setback can be reduced. Averaging is proposed between the house to the north, which has a 6 foot setback from the eastern concrete bulkhead, and the undeveloped park property to the south that has a 30 foot setback. When averaging these setbacks, the resulting setback width from the eastern bulkhead is 18 feet, which is currently proposed for the project. The setback is measured between the top of the bulkhead, which marks the ordinary high water of Hood Canal, and the footprint of the cabin. The cabin is currently 8 feet from the south bulkhead and because the cabin is being moved about 8 feet to the north, the setback will be increased to 16 feet. A walking path is proposed through the enhancement area to provide access to the shoreline and allow maintenance of the vegetation and the cabin. rd Grading is not proposed except to remove the concrete patios and the site will remain at the existing grade. It is not clear how thick the concrete patios are (the top of the patios are 1 to 3 inches below the top of the bulkheads) and the final depth of the topsoil will be determined once the concrete is removed. At least 6 inches of topsoil will be installed so that there is loose native soil within 2 inches of the top of the bulkhead. The topsoil may be rototilled with the soil beneath the patios to loosen it so that the installed plants can send down roots. 6.3 Planting Plan The plants chosen to enhance the shoreline setback on this property are native and common to the shorelines of Hood Canal and Jefferson County. The plants as listed below and shown on the enhancement drawing (attached) shall be obtained from regional native plant nurseries and the shrubs will be planted about 5 feet apart and the trees will be scattered as shown. The shrub species include Nootka rose, ocean spray, snowberry and Oregon grape along the bulkhead with salal installed close together on the southern bank. Shore pine will be installed as shown on the enhancement drawing. The plants selected for this enhancement project include ocean spray and Nootka rose that grow to be 5 and 8 feet in height with ocean spray sometimes growing as tall as 12 feet. Lower shrubs (snowberry and Oregon grape - growing to 4 feet) are included to provide low layer so that a multilayer vegetation community is created to offer the greatest protection for the critical areas. The shore pines are proposed to provide visual interest and increase plant species diversity as well as to provide evergreen cover along with the Oregon grape. The planting plan has been designed to allow for a walking path that will allow the property owner to access the beach and all areas around the cabin for maintenance needs. SHORFLINF PLANT 1,T4T-1qnacFw. tPd �i7P('lPR Quantity Common Name Botanical Name Size Spacing 22 Nootka rose Rosa nutkana 1 gal 5' on center 23 Oceans ray Holodiscus discolor 1 gal 5' on center 16 Snowberr �S m horicar os albus 1 gal 5' on center 17 Tall Ore on ra e Mahonia a uifolium 1 gal 5' on center 14 Salal Gaultheria shallon 1 al 5' on center 15 Shore pine Pinus contorta contorta 1 gal Randomly as shown Once the plants have been installed, the ground should be covered with a rough woody or organic mulch to deter the growth of non-native plants and to retain moisture for optimal plant growth. Since the site is not currently subjected to significant non-native plant species coverage, no extraordinary measures are proposed to protect the installed plants. Work within the shoreline setback should occur during the dry period of the year to lessen the potential impact of the demolition work on the shoreline community. Because much of the enhancement work takes place landward of the bulkheads and there is a 1 to 3 inch lip above the patios, the removal of concrete, placement of topsoil and rototilling activities should have no water quality or other impacts to the shoreline community even if the work is conducted through a minor rain event. 5 The planting plan shows the location of the individual plant clumps as well as the location of each shore pine to be installed within the shoreline setback. The drawing is diagrammatic and while actual plant location may vary, on the ground installation will likely be as shown. Since the plants will be installed as potted individuals, they can be installed during the summer months although they must be watered on a regular basis. Plant installation can take place at any during the construction process but it is best to install the topsoil and plants after the home has been constructed and during the winter months (October 15th to March 151h) when the plants are dormant so that they are in the ground at the start of spring growing season. In general, the plants will be laid out by hand at the specified spacing or as shown on the enhancement drawing and not measured out by string line. The plants will be installed by digging a one to two foot diameter hole and placing the plug from the pot into the ground once the soil around the plug is loosened. The hole will then be backfilled with the dug out soil and loosely packed down around the plug. G Nrap Output Page 1 of 1 FOREST PRACTICE ACTIVITY MAP 4Ye 4,1 a, TOWNSHIP 0 NORTH HALF undefined, e RANGE G 0 (W.M. )HALF undefined, SECTION 0 Application #: NAD 83 '�� Contour Interval: 40 Feet loc4fon http://fortress.wa.gov/servlet/com.esri.esrimap.Esrimap?ServiceName=fparsactbw&ClientVersion... 12/ 1 /2008 4_4 F 00 41 0 cz 0-4 I >k -0 0 (n a. < VII co 0 2"D c 0 c (1) U> (1) :6- 0 _j (6 LO CD 0 �6 j LLI C) CL ul 0- a) =1 A LL ­2 Ak z 0 C) 0 CD U_ cc Ak ILL M to T 1 b c (/ C « m m Cl) m N Y w a m 2 w N a0 a 33 y w a K c c e y m a N � c V y y3 i]cn cNm Nm m „W av 0 W7 Or CQd7 CL d�7 lLN mA E « m O ao 00o E E o C7 v M$ N OVl O O 0 m o& o O O OO 0 OJW WLL LL LL JC JZZU, U) r-}� -t I 2 111 Z ZZZ ® r 0 ❑ ❑ 47-42-30 N 47-42-25 N 47-42-20 N 47-42-15 N 47-42-10 N is M N N N Z N am M Oj N N N N ti G1 C N C) CD m Q- M N m v m� u? m N N Old ` U O � _y f0 On c� m O CR NU) C N � E �m p— CN W N N ELL e p O N to f6 M VJ Q7w m CD c 1,v Qo0 1� J W U aO M N N �T F 0�Ta ❑ Qi Q W 1' A O � N 0£-Zb-Lb N 9Z-Zti-Lb N OZ-Zb-Lh N 96-Z4-Lb N M-Zb-Lt7 E y FIo fw N N 0 � ry .r Z W .1 I' C G ❑ C C ! 7 0...."— m it •jr i+}r���hJf f 0 ..0 4! v 7 W 70 C: ca 70 70 0 E a) 0 0 cu 0 U) CU (Ij c d) ID o V) E n E co CL (D _0 .2 q) Q 00 0 cu 1 a) U) 0 _0 > (n 0 o Co U 10 a)) (D Q c: 0 cm (1) Lo — CO 0 66 0 Lc) 41, ...... 0 O c:) uj a) 0 < 0 --1 ............... --------------- pb —41-415 z ...... C� C) < z C.) co CU 0 < 0.4 C: 0 0 LL y ZCZ 0 ......... . .... ........... 0 C: --nx LL (o co