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HomeMy WebLinkAboutWetland Delineation 08/06 989100031 I I I :1 I I I I I I I I I I I I I I I WESTECH COMPANY Environmental Consulting - Site Permitting lO lE (C; lE n 'W IE \ AUG 3 1 2006 --~ \: ill Jl:JrERSON COUNTY y"'.. \ OEPT. OF cmW,UNIT'Y (JE\I[LOPhit~~_J REVISED WETLAND DELINEATION AND MITIGATION REPORT ASSESSOR'S PARCEL #989100031 132 OLD FLAGLER ROAD JEFFERSON COUNTY, WASHINGTON August 2006 G. Bradford Shea, Ph.D. Kim Loafman Submitted to: JEFFERSON COUNTY DEPARTMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street Port Townsend, Washington 98368 Submitted by: WESTECH COMPANY P.O. Box 2876 Port Angeles, Washington 98362 P.O. Box 2876 - Port Angeles, Washington 98362 - Telephone: (360) 565-1333 - Fax: (360) 452-6708 email: bshea@tenforward.com I I I I I I I I I I I I I I I I I I II REVISED WETLAND DEL NEATION AND MITIGATION REPORT ASSESSO 's PARCEL #989100031 JEFFERSON COUNTY, WASHINGTON ugust 2006 G. Br dford Shea, Ph.D. im Loafman ubmitted to: JEFFERSON COUNTY DEPA TMENT OF COMMUNITY DEVELOPMENT 621 Sheridan Street Port Town end, Washington 98368 ubmitted by: WES ECH COMPANY .0. Box 2876 Port Ang les, Washington 98362 I I I I II I I I I I I I I I I I I I I CONTENTS CHAPTER/SECTION PAGE NO. 1.0 INTRODUCTION 1 2.0 METHODS 5 3.0 WETLAND DELINEATION RESULTS 7 3.1 Existing Conditions 7 3.2 Description of Wetlands 10 3.3 Land Uses and Habitat Values 11 3.4 Wetland Types and Buffers 11 4.0 MITIGATION PLAN 13 4.1 Regulatory Setting 13 4.2 Project Impacts 13 4.3 Plan Components 14 4.4 Detailed Mitigation Measures 14 4.5 Implementation and Timing 17 4.6 Mitigation Monitoring 17 4.7 Contingency Plan 19 5.0 PLANTING PLAN 20 6.0 CONCLUSIONS AND RECOMMENDATIONS 22 6.1 Conclusions 22 6.2 Recommendations 22 7.0 REFERENCES 23 TABLES Table 1. Upland and Wetland Vegetation 9 Table 2. Site Soils 12 Table 3. Ust of Native Plants for Wetland Mitigation and Enhancement 21 WW954REVOFWMP ,TOC/082206/xmk I I II I I I I I I I I I I I I I I I II CONTENTS CHAPTER/SECTION PAGE NO. FIGURES Figure 1. Location Map Figure 2. Vicinity Map Figure 3. Parcel Map Figure 4. Wetland Delineation Map Figure 5. Planting Areas Map Figure 6. Septic Location 2 3 4 8 16 18 APPENDICES Appendix A - Site Photographs Appendix 8 - Wetland Map and Data Forms A-1 8-1 WW954REVOFWMP.TOC/082206/xmk ii I II I I I I I I I I II :1 :1 I I I I I :1 I 1.0 INTRODUCTION The property described as Assessor's Parcel #989100031, located in Jefferson County, Washington is a 1.6 acre parcel of land owned by Harold Brown. The property (Site) is located at 132 South Old Flagler Road in Port Hadlock, Jefferson County, Washington. It lies in the southeast quarter of Section 1 of Township 29 North, Range 1 West, Willamette Meridian (W.M) (Figures 1, 2 and 3). Westech Company surveyed the Site for critical areas. A single wetland was found in the southwestern corner of the property. The landowner, Harold Brown, contracted with Westech to delineate this wetland, mark the buffer zone, and determine the wetland type. The owner wishes to define placement of a home-site which can be permitted under Jefferson County regulations for a single-family residence and on-site septic system. Chapter 3.0 of this report contains results of the delineation. The proposed home-site is within the forested eastern portion of the property. Access to the building site would be via extension of an existing unpaved road traversing through the buffer zone. A Mitigation Plan has been prepared to offset impacts which may result from further construction necessary for improvement of the access road into the property. That Mitigation Plan and associated Planting Plan are described in Chapters 4.0 and 5.0 of this report. Surveying has been recently conducted and property boundary lines marked with pink and white flagging. Flagging was readily evident in the field. Three perc test pits have been dug in the forested upland area on the east side of the parcel. County Assessor's parcel maps, aerial photographs, and U.S. Geological Survey maps were provided by the Jefferson County website and were utilized as base maps for wetland mapping. Initial field investigation of the wetland was conducted by Dr. G. Bradford Shea with assistance by Mrs. Kim Loafman, Mr. James McDougall, and Mr. Justin Rondeau on March 31, 2006. The wetland buffer was marked in the field on April 19, 2006 and additional research regarding mitigation on intrusion into the wetland buffer area to be potentially impacted was also collected at this time by Mrs. Loafman and Mr. McDougall. WW954REVOFWMP.RPT/082206/xmk 1 I I I I I I I I I I I I I I I I ~ .0. ~ ~ -.; .0. c ~ .12 ~ l; ~ ..c; ~ ~ ~ '" " '" ~ ~ 0 " 0 ",' c "8 0 '" " '" ." 0 "'6 " 2 ." 8 ..c "'6 .. 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('f) ~ ::J C) u: I I I I I I I I I I II I I I I I I I I 2.0 METHODS Wetlands were delineated in the field based on field methods recommended in the Washinaton State Wetlands Identification and Delineation Manual (DOE 1997). Wetland rating was accomplished according to the Guidelines of the Washinaton State Wetlands Ratina Svstem (Western Washington) (DOE 1993). Methods were essentially those recommended by the U.S. Army Corps of Engineers for Routine On-Site Field Method of Delineation of Wetlands (ACOE 1989). Guidelines and requirements of the Jefferson County Critical Areas Code were applied as applicable (Unified Development Code, Section 3, Land Use Districts 2001). Wetland plants were primarily identified in the field, with subsequent collection and keying when necessary. Plants were identified using the following sources: Cooke 1997 Guard 1995 Pojar and MacKinnon 1994 Hitchcock and Cronquist 1973 Lyons 1997 Taylor 1995 Keying of plants using magnifying lenses and dissecting microscope was used as necessary. Determination of wetland indicator status utilized regional keys published by U.S. Fish and Wildlife Service (USFWS 1988). Soils were determined through field examination. Soils were dug or augured to depths of up to 18 inches using a wetland shovel, a 24" soil probe and a standard augur. Soil consistency was determined by feeling for grain size and texture. Soil moisture was determined at that time. In the event of saturated conditions in the hole, depth to standing water was noted. Soil color was determined through comparison of field samples with standard Munsell Color Charts (Munsell 1994). Soil was also examined for presence of mottles, gley, and other indicators of anaerobic soil oxidation. Hydrologic conditions were determined through examination of topographic relief and drainage patterns. Soil moistness was determined by hand as indicated above and in the event of standing water; depth to standing water was noted. Initial field surveys were carried out by Dr. Shea, Mrs. Loafman, Mr. McDougall, and Mr. Rondeau on March 31, 2006, with a follow-up field visit on April 19, 2006. These surveys included identification of plants, wetland habitats, soils, and hydrology. Wetlands were determined based on the Routine On-Site Field Method used by Washington Department of Ecology and the U.S. Army Corps of Engineers. Wetlands were determined by a combination of vegetation, soil, and hydrology indicators. Specific transect and quadrat points were sampled along apparent wetland edges. Various points were sampled for vegetation, soil, and hydrology in order to determine wetland WW954REVOFWMP.RPT/082206/xmk 5 I I I I I I I I I I I I I I I I I I I boundaries. Appendix B contains wetland maps and data forms for one typical sample point from each of the delineated wetlands. Wetland boundaries in forested areas were indicated by the use of pink "Wetland Delineation Boundary" flagging tape attached to trees or shrubs at appropriate points. Along road edges, the wetland boundaries were marked in the field with the use of 24 and 48 inch wooden stakes tied with the same flagging. All boundaries were staked and/or flagged every 20-25 feet. Wetland buffer zones were determined based on field measurements and regulatory requirements, and were staked in the field and marked with orange and black striped flagging every 20-30 feet. WW954REVOFWMP.RPT/082206/xmk 6 I I I I I I I I I I I I I I I I I I II 3.0 WETLAND DELINEATION RESULTS 3.1 Existing Conditions Jefferson County mapping shows that a large wetland covering an area over 1.0 mile long runs south of the Site from Oak Bay north to Port Townsend Bay. Mapping also shows the wetland as covering the western two-thirds of the property located at 132 South Old Flagler Road. Westech Company's field investigation found that the location of the wetland differed from that of the Jefferson County mapping (see Appendix B). The wetland was found to occur on the southwestern corner of the Site as shown in Figure 4. This wetland can be categorized as a Category II wetland according to the DOE classification system. This rating is based on the water quality, hydrologic, and habitat functions of the wetland. It is a depressional type wetland located at the base of a low hill. The eastern side of the property which is forested has an elevation of 62 feet above mean sea level (msl) and from there the terrain gently slopes down to the wetland along the paved road on the western edge to an elevation of 38 feet. This wetland does not have a stream or river running through it on-site which would provide water influx. It appears that this wetland is maintained by high groundwater in the area. It is ditched along the road but there is no obvious natural outlet. Vegetation, soils, and the hydrology of the wetland are described in more detail below. The results from data collected on these three factors at two locations are shown in Appendix B. Site photographs can be found in Appendix A. Veaetation The Site vegetation transitions from a forested wetland along the paved road on the . western boundary to a forested upland area on the eastern side of the property. Site vegetation is fairly diverse with over 30 tree, shrub, and plant species (see Table 1 for a complete listing of plants found aUhe Site). The forested upland area is dominated by several native tree species (Douglas fir, grand fir, big-leaf maple, pacific madrone, and western hemlock). Underneath these mature trees is a dense understory of red elderberry, red huckleberry, Indian plum, oceanspray, salal and sword fern. The wetland is also wooded but comprised primarily of red alder, though sapling-sized western red cedar and Sitka spruce can also found. Interspersed among the trees in the wetland are areas of salal and sword fern growing on mounds of soil and decomposing organic matter. Vegetation in the wetland also includes a variety of obligate (OBL) and facultative (FAC) plants such as skunk cabbage, water parsley, cattail, western coltsfoot, soft rush, and salmonberry. The upland area is roughly the eastern side of the property, while the wetland occupies the southwestern corner. A 100 foot buffer area has been defined adjacent to the wetland boundary as per the wetland rating and County regulations. WW954REVOFWMP.RPT/082206/xmk 7 il , I I I I I I I I I I I I I I I I I I co co 00 00 N N >- >- c: c: CO CO c.. c.. 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"SQ) 00> en~ IJ.. z ( II I I I I I I I I I I I I I I I I I I TABLE 1. UPLAND AND WETLAND VEGETATION Common Name Scientific Name Indicator * Wetland Water parsley Cattail Skunk cabbage Soft rush Creeping buttercup Hooker's willow Western coltsfoot Stinging nettle Salmonberry Swamp gooseberry Red alder Western red cedar Sitka spruce Common horsetail Himalayan blackberry Lady fern Oenanthe sarmentosa Typha latfolia Lysichiton americanum Juncus effusus Ranunculus repens Salix hookeriana Petasites frigidus Urtica dioica Rubus spectabilis Rives lacustre Alnus rubra Thuja plicata Picea sitchensis Equisetum arvense Rubus discolor Athyrium filix-femina OBL OBL OBL FACW+ FACW+ FACW- FACW- FAC+ FAC+ FAC+ FAC FAC FAC FAC FAC FAC Upland Red elderberry Trailing blackberry Grand fir Douglas fir Oregon grape Bigleaf maple Salal Sword fern Red huckleberry Western hemlock Indian plum Dandelion Bitter cherry Cleavers Western yew Oceanspray Pacific madrone Sambucus racemosa Rubus ursinus Abies grandis Pseudotsuga menziesii Mahonia nervosa Acer macrophyllum Gaultheria shallon Polystichum munitum Vaccinium parvifolium Tsuga heterophylla Oemleria cerasiformis Taraxacum officinale Prunus emarginata Galium aparine T axus brevifolia Holodiscus discolor Arbutus menziesii FACU FACU FACU FACU FACU FACU FACU FACU FACU FACU FACU FACU FACU FACU F ACU- UPL UPL *Indicators: UPL = Upland Plant, FACU = Facultative Upland Plant (more upland than wetland), FAC = Facultative (borderline wetland plant), FACW = Facultative Wetland Plant (prefers wetland conditions), OBL = Obligate (only found in wetlands). WW954REVOFWM P. RPT/082206/xmk 9 I I 'I il I I I I I I I I I I I I I I I Soils Soils on the Site are mapped as being of the Alderwood-Sinclair soil series (SCS 1975). These soils are generally moderately well-drained as they are found on strongly sloping to steep sites. These soils are gravelly and are underlain by compact glacial till. The specific soil types mapped by the Soil Conservation Service (SCS) for the Site are: 1) Belfast Silt Loam. Wet Variant (Bk). This nearly level soil is on flood plains. The upper nine inches of the soil is dominantly very dark brown or very dark greyish- brown, slightly acid or neutral silt loam. Below this, to a depth of 20 inches, is dark-grey or dark greyish-brown, slightly acid or neutral silt loam, fine sandy loam, or loam mottled with strong brown and dark yellowish brown. Gravel content ranges from two to 25 percent, increasing with depth. This soil is poorly drained. Permeability is moderately slow. The soil holds 10-12 inches of water available for plants. A seasonal water table is often found at a depth of 0.5-1.0 feet. 2) Cathcart Gravellv Silt Loam (CIC), 0 to 15 percent slopes. This nearly level to rolling soil is on glaciated uplands. Most slopes range from 5-10 percent. This soil is well drained. Permeability is moderate. Roots penetrate to the bedrock. This soil holds 3-6 inches of water available for plants. Runoff is slow to medium, and the hazard of water erosion is slight to moderate. The soil tests performed in the upland area confirm that these soils fall in the Cathcart gravelly silt loam association. Field investigation revealed, however, that the actual soils in the wetland area at the Site do not match the type mapped. Soil samples in the wetland area were dominated by muck mixed with varying amounts of clay. These wetland soils were dark brown to black. Soils were also saturated, as indicated by the standing water found in test pits at two inches below the ground's surface (Table 2). HydroloQY Hydrology of the Site is that of a low-lying depressional wetland. This wetland is not isolated as the wetland continues on to the property to the south (Assessor's Parcel # 901121001). The wetland is fed by precipitation and the high groundwater of the area. Inflow is non-existent due to the absence of a significant size stream passing through the wetland. There does not appear to be any natural outflow channel, based on a search for potential culverts along Old Flagler Road. 3.2 Description of Wetlands There is a single Category II wetland on-site which occupies the southwestern corner of the parcel. The western edge of the wetland runs from the southwest property corner north along South Old Flagler Road and ends at its closest point approximately 18 feet south of the center of the gravel access road. This wetland extends to the east, WW954REVOFWM P. RPT/082206/xmk 10 I I I I I I I I I I I I I I I I I I I remaining on the south side of the access road. This is a forested wetland with a canopy cover of primarily of red alder, a heavy understory of shrubs predominately of salmonberry and an herbaceous layer comprised of skunk cabbage, water parsley, and soft rush. Wetland soils were saturated mucky clay. Topography and the lack of drainage in this wetland have resulted in saturated surface soils. Hydrology is such that there are pools of standing water throughout the area. 3.3 Land Uses and Habitat Values The Site is currently an undeveloped property zoned for residential development. The Site contains a forested wetland and a forested upland area. Both contain a diversity of plant species (Table 1). These areas, combined with the rural nature of the surrounding neighborhood appear to provide reasonably good habitat for amphibians (both terrestrial and pond-breeders), reptiles, small mammals, and birds. Hummingbirds were seen visiting flowering shrubs such as salmonberry in the wetland. Larger mammals including carnivores such as coyote likely use the Site as evidenced by the scat found on the access road cleared of vegetation that leads into the forested area of the property. Skeletal remains of a black-tailed deer were also found. 3.4 Wetland Types and Buffers The wetland on the Site was rated according to Washington Department of Ecology guidelines (DOE 2004) and qualifies as a Category II wetland (see Appendix B). The wetland size and location is shown in Figure 4. The wetland is above the regulatory threshold in size and would therefore be considered a regulatory wetland according to Section 3.6.9 of the Jefferson County Code. A 100 foot buffer is required for development of a single-family residence. Black and orange striped flagging indicating that size buffer zone has been placed along the on-site borders of this Class II wetland. The northernmost on-site buffer flag can be seen by walking 180 feet up the access road to where the buffer line crosses the road. The buffer flags have been tied to and hung from trees, and each is visible from the next. Beginning in the northwest corner of the property, an existing access road passes through a section of the buffer zone. The first section of the road has been culverted and gravel has been laid down. The remaining section has only been cleared of vegetation and is currently not suitable for vehicles. This road is to become the driveway accessing the building site in the upland eastern section of the parcel. The potential impacts on the wetland and buffer zone of the construction of the residence and future work to be done on the access road will be discussed in Chapter 4.0 where mitigation measures to offset the effects of the project will also be highlighted. WW954REVOFWM P. RPT/082206/xmk 11 I I I I I I I I I I I I I I I I I I I TABLE 2. SITE SOILS Location/Depth Tvpe Color Value/Chroma Plot # VSH-1 Wetland 0-6" Muck Black 2/1 (10YR) 6-12" Muck with clay Black 2/1 (10YR) 12"+ Muck with clay Dark brown 3/2 (10YR) Plot # VHS-2 Upland 0-6" Silty sandy loam Dark brown 3/3 (10YR) 6-12" Silty sand with cobble Brown 3/6 (10YR) 12"+ Sandy silt loam Light brown 4/6 (1 OYR) *Value/Chroma readings are from comparison of field samples with Munsell Soil Color Charts. WW954REVOFWMP.RPT/082206/xmk 12 II I I I I I I I I I I I I I I I I I I 4.0 MITIGATION PLAN 4.1 Regulatory Setting This Mitigation Plan is intended to support an application for a permit for a single-family residence and drainfield at 132 South Old Flagler Road under Jefferson County's Critical Area Code. The Plan is intended to meet the mitigation criteria for a variance to the Jefferson County Unified Development Code as specified in Section 3.6.9 (Jefferson County 2001). 4.2 Project Impacts The property owner has proposed that the home-site be located on the eastern side of the property within the upland forest. There appears to be adequate space at this location for a home-site. The only on-site access for this location, however, would require a driveway to pass through the wetland buffer. Jefferson County has mapped the property such that the existing driveway crosses through a portion of the wetland and the buffer zone. Ground-truthing of the field conditions indicate, however, that the existing access road does not go through the wetland and comes no closer than approximately 18 feet to the edge of the wetland. The access road does, however, pass through a portion of the buffer zone north of the wetland. The project involves increasing the length of the existing driveway to extend from the northwestern corner of the property to the proposed home-site in the east. The first 123 feet of the existing access road has been graded and gravel has been put down. The remaining length of the road is currently cleared of vegetation but remains undriveable. Construction would involve placement of additional fill material (gravel) within approximately 80 feet of the buffer zone associated with the Category II wetland. Potential impacts of the proposed project include the following: 1) Potential increases in erosion and sedimentation into the wetland due to removal of additional buffer zone vegetation and grading for the extension and improvement of the access road. 2) Additional disturbance to the buffer zone by resurfacing and increasing the quality of the current graveled portion of the driveway. 3) Potential changes in water quality from silt runoff due to construction of the proposed home. These impacts can be offset as described in the sections below which discuss the mitigation measures necessary to fully offset impacts from placement of the driveway within the buffer zone. WW954REVOFWMP,RPT/082206/xmk 13 I I I II I I I II I I I I I I I I I I I I I I 4.3 Plan Components The components of this Mitigation Plan are as follows: 1) Erosion control through project timing, emplacement of control measures, and revegetation and/or covering of graded areas. 2) Planting of new shrubs and trees to enhance the buffer zone and its value as habitat. 3) Placement of silt fences and other erosion control measures to prevent silt and sediment from entering the wetland. The access road was in place prior to Westech Company's preparation of this Wetland Delineation Report. Because of this, disturbance to the buffer zone had already occurred. The focus of this Mitigation Plan is to highlight ways to reduce any further adverse impact to the wetland or its buffer and to offset impacts which have occurred. A more detailed description of actual construction and mitigation measures is contained in the following section. 4.4 Detailed Mitigation Measures The detailed mitigation measures corresponding to the Plan components listed above are as follows: 1 a. Perform grading operations on the driveway extension during the dry season (April 1 to October 15). Graded areas should be covered with non- eroding materials such as gravel or be re-vegetated within seven days of construction during the dry season. Completion of gravelling of the access driveway in and near the buffer zone should be prior to November 1 or else it should be re-vegetated or covered with straw and/or jute netting to stabilize these graded areas during the wet season. 1 b. Install all erosion control measures prior to beginning grading or other ground disturbing construction activities. Silt fences should be placed between the access driveway and the buffer/wetland. Silt fences should be placed on the downhill edge of construction zones. Straw bales, jute netting, or other appropriate materials should be used to stabilize sloped areas following grading. WW954REVOFWMP,RPT/082206/xmk 14 I I I I I I I I I I I I I I I I I I I 1 c. Two culverts shall be placed under the proposed driveway extension as shown in Figure 5. A small seep occurs along the northern edge of the property, which drains into the wetland. Although the amount of water coming from the seep is not significant, if it is not allowed to flow naturally, the proposed road may provide a barrier for the water and accumulation may occur. There should be a six inch fall from one end of the culvert to the other, with the culverts angled toward the wetland. Through emplacement of culverts, natural drainage from the upland to the wetland will be maintained and possible road failure will be avoided. The culverts should match those recommended by Jefferson County (12 inch culverts should be adequate). 1d. The driveway width should be no greater than 12 feet, plus necessary sideslopes (sideslopes not to exceed a 2.0 foot footprint each). Total footprint of the driveway where sideslopes are necessary should thus be no more than 16 feet. Areas where no sideslope is necessary should have a footprint of 12 feet or less. In either case, the footprint should be staked in the field prior to construction and equipment operators should be instructed not to deposit materials or to operate machinery outside of this footprint within the buffer zone. The height of fill should be less than 18 inches above the current grade, although more may be required at culvert locations. Sideslopes should conform to standard engineering practices and Jefferson County Code requirements. 2a. New shrubs and trees will be planted within the buffer zone as per the planting plan described in Chapter 5.0. 2b. Planting success will be monitored and will conform to performance standards as described in Section 4.6. If performance standards are not met, additional plantings or other remedial actions will be taken to meet the standards. 3a. Silt fencing will be placed downslope of the construction site, and excessive clearing of the area around the home-site should be avoided to the extent possible. The vegetation that currently occurs between the proposed home- site and the wetland will also help to reduce the risk of silt pollution. 3b. Erosion control measures discussed above should be implemented as necessary. WW954REVOFWMP,RPT/082206/xmk 15 I I I I I I I I I I I I I I I I I I I ~ .00'09 ~ . ::I: '" . ~w .... .............. ......... .............. .... '. '. .............. e......... ........ .......... ..- ..... :~ ..~ . . . . . . . . : : : : ! ~ L..... Q) +-' "en I Q) E o I . \, """ ~ ". ..... ....... . . . . . . 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Q) m () en Q) +-' ctI E 'x e c.. c.. ~ I I I I I I I I I I I I I I I I I I I 4.5 Implementation and Timing Construction of the driveway extension, building of the home and placement of the septic system (see Figure 6) should be conducted between the period of April 1 through October 15, if feasible, in order to avoid carrying out ground disturbing activities during the rainy season (for minimization of erosion). Any construction work during the rainy season should have all erosion control measures in place prior to beginning work. Additional erosion control measures as necessary may be incorporated to prevent erosion of soils and sediments into the wetland. New plantings to be established in the buffer zone should be carried out during early fall if possible (September-October) to avoid the necessity of supplemental watering. Plantings can be placed during the winter or early spring if necessary. If plantings occur during summer months, supplemental watering with a drip irrigation system or equivalent method may be necessary. 4.6 Mitigation Monitoring Monitoring success of erosion control measures will be carried out daily during the construction period. Any evidence of significant erosion or sedimentation entering the buffer zone or wetland will result in immediate action to block erosion and sediments. Such siltation can best be blocked by additional silt fences, straw bales, or temporary berms. The two recommended culverts should be maintained annually to ensure that water flows freely from north to south across the property. This may require periodic removal of leaves, brush, or other material from the culverts. Maintenance of the driveway should be performed as needed. Maintenance gravels should be compacted to limit erosion into the wetland. Monitoring success of new plants will be carried out according to the following schedule: 1) Following construction, plant new plantings and check soil conditions. Holes should be of appropriate size, generally 2-3 times the size of the container, filled with topsoil. New plantings should be adequately watered immediately upon placement in the ground. Mulch should be used as necessary. 2) Prepare an initial monitoring report at the end of the first growing season following plantings (within one year of the completion of construction). This report should address the success of the plantings. Any plant mortality should be noted and corrected if plant survival falls below 100 percent during the first year and below 85 percent during successive years. WW954REVOFWMP.RPT/082206/xmk 17 I I I I I I I I I I I I I I I I I I I .............. .............. t (I) > "3 ()rn c (I) 0 - .- CU- E ~ .- 0 ~....I .... a. a. <( .............. ....... ....... (I) c o N .... ~ ::J III (:) o ...... "0 cu o 0:: rn rn (I) o o <( "'C c: ~ ~ 0- (I) _ > tJ)tJ) >(1)0)- =c:~a: ~o"'C- t:.,'N - tJ) o ......~ 0) C)O)-~ 2 :s:: .~ - CtI ::J ~'o ()COOen Ii. $ co co 00 00 N N >.C: c..~ ~ ..... E co o "'C () 0 .s::. ..... () CtI 0) :::c - tJ) .. ~ ~ o en - c: cu 0- 0) :t::: en tJ) ~..... 0) c: :: o ~ 0) c.. e c.. ..... 0) c.. tJ) CtI -- c: o +:i CtI () o ...J () +:i c.. 0) en co ~ ::J C) i.i: - 0) ~ LO LO II .s::. o .~ ..-- 0) cu () en 2 CtI E 'x o ..... c.. c.. <( I I I I I I I I I I I I I I I I I I I 3) Prepare follow-up monitoring reports at the end of the next four years following construction and restoration. Monitoring needs to be conducted for a total of five years, with a monitoring report submitted annually to Jefferson County. Note any corrective actions ~hich are necessary, including additional supplemental planting to compensate for plant mortality and the apparent reasons for such mortality. 4.7 Contingency Plan A Contingency Plan should be prepared in the event that the mitigation measures appear to be unsuccessful, particularly in terms of erosion and sediment control. The Plan should also address any significant lack of success with new plantings, particularly failure to meet the performance standards of 100 percent survival during the first year and 85 percent survival during the second and subsequent years. The percent cover of non-native species in the buffer enhancement area should not exceed 10 percent. If monitoring indicates that more than 10 percent of the enhanced buffer area consists of non-native or invasive species, contingency measures must be implemented. The Contingency Plan should include actions which will be taken to correct any defects and accomplish the intended purposes of the Project. WW954REVOFWMP.RPT/082206/xmk 19 I I I I I I I I I I I I I I I I I I I 5.0 PLANTING PLAN Revegetation is to occur along both sides of the access road but only for the portion which passes through the buffer zone. The driveway itself and sideslopes will be made of compacted fill material and will thus not be suitable for revegetation. The existing forested upland, of which the buffer zone is comprised, appears to be very healthy. Revegetation and planting to mitigate for improvements to the existing drive and filling of the existing roadbed will not be excessive in an effort to avoid impacting the already healthy forest ecosystem. Accordingly, only shrubs and small trees which currently occur on the property will be planted. The likelihood of future road maintenance issues influenced the selection of the kinds of vegetation to be planted because of the. location of the planting areas adjacent to the driveway. Planting areas are shown on Figure 5. The number of small trees and shrubs planted should correlate directly with the amount of vegetation removed, destroyed, or harmed during the process of road construction, grading, and culvert installation as per Table 3. One-gallon pots of salal and sword fern with four foot centers, and three-gallon pots of salmonberry, oceanspray, and red elderberry with eight foot centers should be planted near the base of the sideslope, approximately ten feet from the road. The western hemlock trees can be planted along the southern edge of the buffer enhancement area, Placement of these plants should be staggered so that they are offset from one another to provide growing room. By alternating them in this semi-random fashion, it will give them a more natural appearing configuration. To increase the potential for the planted species to survive, four inches of mulch should be placed around the installed plants. Mulch should be held back two inches away from the stem of the plants. We recommend that a landscaping firm, arborist, or registered nursery person assist the landowner with the plantings in the buffer zone. Monitoring should be performed by use of these persons or a qualified biologist. WW954REVOFWMP,RPT/082206/xmk 20 I il I I I I I I I I I I I I I I I I I TABLE 3. LIST OF NATIVE PLANTS FOR WETLAND MITIGATION AND ENHANCEMENT Location: Both sides of access road along portion which passes through buffer zone. Species Scientific Name Number Size Salmonberry Rubus spectabilis 14 3 gallon Salal Gaultheria shallon 15 1 gallon Sword fern Polystichum munitum 15 1 gallon Oceanspray Ho/odiscus discolor 12 3 gallon Red elderberry Sambucus racemosa 10 3 gallon Western hemlock Tsuga heterophylla 8 3 gallon WW954REVOFWMP.RPT/082206/xmk 21 I I I I I I I I I I I I I I I I I I II 6.0 CONCLUSIONS AND RECOMMENDATIONS 6.1 Conclusions The wetland on the property is classified as a Category II wetland requiring a 100 foot buffer zone. The landowner proposes to build a home in the forested upland area of the property. Without an easement from an off~site owner, this eastern portion of the Site cannot be developed without access through the buffer zone. Prior to this Wetland Delineation and Mitigation Plan, an access road existed on-site. Improvement of this driveway within the buffer zone, in conformance to the requirements of Chapters 4.0 and 5.0 of this report, will result in an adequately mitigated disturbance to assure no significant net impact on the wetland. Mitigation measures as outlined above have been formulated to offset impacts to the buffer zone. These include installing culverts under the road bed to maintain natural drainage flow and prevent road failure, and planting additional vegetation in certain areas of the buffer zone. Additionally, erosion control measures are to be carried out to prevent sedimentation in the wetland. 6.2 Recommendations Figure 4 shows the mapped location of the regulatory wetland found on the Site. The recommended 1 00 foot buffer zone which has been marked in the field is also shown on Figure 4. No structures, grading, excavating, filling, draining or other activities which may adversely affect the wetland may be carried out in the wetland or in the buffer zones as per Section 3.6.9 of the Unified Development Code. The proposed project is to improve the existing road through the buffer zone so as to access the eastern portion of the property where a future home-site is to be located. Westech Company recommends that a silt fence be placed between the road areas to be graded and the wetland area prior to initiating construction. Hay bales, jute netting, and other erosion control devices should be used as necessary for the duration of construction, grading, and culvert placement to keep silt and sediment out of the wetland. Following disturbance to the buffer zone, it should immediately be revegetated according to the planting plan outlined in Chapter 5.0 Enhancement to the current access road and further construction of the extension to it, if permitted by Jefferson County, should be carried out as per Chapter 4.0 of this report which details provisions for its construction, revegetation, and maintenance. WW954REVOFWM P. RPT/082206/xmk 22 I I I I I I :1 I I. I I I I I I I I I I I 7.0 REFERENCES Cooke, S.S. 1997. A Field Guide to the Common Wetland Plants of Western Washinaton and Northwestern Oreaon. Seattle Audubon Society. Seattle, Washington. Guard, J. 1995. Wetland Plants of Washinaton and Oreaon. Lone Pine Publishing. Renton, Washington. Hitchcock, C.L. and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washington Press. Seattle, Washington. Jefferson County. 2006. Online Map Database. Accessed March/April 2006. httpllmaps.co.jefferson.wa.uslWebsite/parcels/viewer. htm Jefferson Cou nty, Washington. Jefferson County. 2001. Jefferson County Unified Development Code. Section 3, Land Use Districts, Subsection 3.6 - Wetlands. Department of Community Development. Port Townsend, Washington. Lyons, C.P. 1997. Wildflowers of Washinaton. Lone Pine Publishing. Renton, Washington. Munsell Color. 1994. Munsell Soil Color Charts. Gretag Macbeth. New Windsor, New York. Pojar, J. and A. MacKinnon. 1994. Plants of the Pacific Northwest Coast. Lone Pine Publishing Company. Redmond, Washington. Taylor, R. 1995. Northwest Weeds. Mountain Press Publishing Company. Missoula Montana. U.S. Army Corps of Engineers (ACOE). 1989. Federal Manual for Identifvina and Delineatina Jurisdictional Wetlands. U.S. Government Printing Office. Washington, D.C. U.S. Fish and Wildlife Service (USFWS). 1988. National List of Species that Occur in Wetlands: Reaion 9 (and Supplement). Biological Report 88(26.9). Portland, Oregon. U.S. Geological Survey (USGS). 1953. Quadrangle Map of Nordland, Washington. 1:24,000 Scale. Published 1953, Photorevised 1973. Boulder, Colorado. U.S. Soil Conservation Service (SCS). 1975. Soil Survey of Jefferson County Area, Washinaton. U.S. Department of Agriculture. Washington, D.C. WW954REVOFWMP,RPT/082206/xmk 23 ,.. I I I I I I I I I I I I I I I I I I I Washington Department of Ecology (WDOE). 1997. Washinaton State Wetlands Identification and Delineation Manual. Publication #96-94. Olympia, Washington. Washington Department of Ecology (WDOE). 1993. WashinatonState Wetlands Ratina System: Western Washinaton. Second Edition. Publication # 93-74. Olympia, Washington. WW954REVOFWMP, RPT/082206/xmk 24 I I I I I I I I I I I I I I I I I I I APPENDIX A SITE PHOTOGRAPHS WW954REVOFWMP,APPAl082206/xmk A-1 I I I I I I I I I I I I I I I I I II I I 1) Access Road facing east. 2) Cleared road bed facing east. WW954REVOFWMP ,APPAi082206/xmk A-2 1 1 I I I I I I I I I I I I I I I I 'I 3) Category II wetland facing east. 4) Category II wetland facing east. WW954REVOFWMP.APPAl082206/xmk A-3 I I I I I I I I I I I I I I I I I I I 5) Proposed building site facing south. 6) Proposed building site. WW954REVOFWMP,APPAl082206/xmk A-4 ; I I I ! I 'I ,I I , I I I I II II I I I I I I I APPENDIX B WETLAND MAP AND DATA FORMS WW954REVOFWMP.APPB/082206/xmk B-1 I I I I I I I I I I I I I I I I I I I l?~.,.........'."..'."""" " n:;;;;r:;':, ,:0 ,,' -__\ ,~~:::,,;~'}- " ' , .,. . ' ' , >' , , , I at , ~ -...~\ 8 rl ~ M_ 1 ~ I I 3 ~ , ~j 'i! ('Ii I~,~,ii,! ,Iii ~ ... I QI I I I i ~ ! I " ,I, i! ( ... ' '1.1"'1,."" I ~ II I ~ I: il I . ~ !I i , I '~-'-~l i i i ~ i i- ~ i ~~I I r I I ~! I ~ liLii , ,,' , II { SI ---L.~.'mU.1 i i I I I I' i 'T~ ',1 i ! i ia"""",~, ! 8 '~i,AA~M~ ~-~ ,i ~L==- m"'__ -n"_,'__ m--'-_I I 1 i i.,. '. i/ at ,. I , i i ) ! l I ~--------.l I i -L~ ~ l ~, I '---1--: ! -'-'-"--1'~----: i j I ... I I i ~' ~ Ii i . I ) I i lJ j . 1 ~+--'nmI_-+ ::\\\ ~ \',\ I ! ~ i ~ ~ "'" i i i n j: ~~"" ,I -. ... '._, ~ ",..,<>-""" -,_J -, ~ >--~.I ~ ~~ 010:'::,;- ~" / i ~ \. '. ""'. " 8\\ ... \ \\, II/~\.\ """"""----j ", iP" ^. " J .', "", "), "\:~~" \~0---~~ -l!\X' " I "----- - '-', ... 'lI--~g 1I I \- i ~'((r'jj7U\.\-'T'li! I ' ~ ~ ~ i ~ r~~u~\I~-..;.i.~ ; · --' ,0 =-"r'l ~: ~ 0, -- ~ dUiji'.lI.U),I--li"il, I I · 'i ~ Ii, i \ ill " ~,- _" 8' · --"- ~"M3_--=--j i _~=L. -:.~h ~="=--' r "-..no;;,:"""'" ~,.- ,,~ " '---."... 0 "'''Th i' ~ .~ i I h, ~ I ~ S _.~ 8 ,,::\, a)..;<,,;, 0" i . i i r-~Tr. I. \. \ \, , g I ~ ',""~k\\ ~ "-" ~ Ii ----' " i i . ! ~ i ~ \:,_ J'i- \ _ ,~ ,.sa ~ .'i\)..' ~'/'\\' 8'/.8 ~., ',i... ~s-i' i r~!g .....~ i ..'I'.li. i SS- !.- ,r", \c .'.". '>'~" _) . i 'Ii", ~. 'L I 8: ~, '.., -,..-' '..'" ".... ~ . a QI,.. --, <D '" :i'. . ~. i. Sl i l6 i~. ~,.' '\: ~ S. ~.." '. . 'I "._..n. ' ,_ '~~)'/\\' j', h; [h . L'+,1...", _,,_ \..... '11;B/"fi.tlr1~ - "'1 r ~ i ~1.~~ ,~ t; I I I I I I I I I I I I I I I I I I I DATA FORM 1 Routine Wetland Determination (WA State Wetland Delineation Manual or 1987 Corps Wetland Delineation Manual) Projectl Site: Old Flagler Road Date: March 31, 2006 Applicant/owner: Harold Brown County: Jefferson State: Washington Investigator(s): Mr. G. Bradford Shea; Mrs. Kim loafman; SIT IR: 1/29N/1 W Mr. James McDouaall; and Mr. Justin Rondeau Do Normal Circumstances exist on the site? . no Community 10: Wetland s the site significantly disturbed (a typical situation)? yes I Transect 10: s the area a potential Problem Area? yes , Plot 10: VSH-1 VEGETATION Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator Water parsley H-35% OBl Cattail 5-15% OBl Oenanthe sarmentosa) I'TvDha latfolia) Salmonberry 5-20% FAC+ Red alder C-10% FAC Rubus sIJectabilis) Alnusrubra) Red elderberry Hooker's willow 5-10% FACU (Salix hookeriana) C-5% FACW- (Sambucus racemosa) Trailing blackberry H-5% FACU Rubus ursinus) HYDROPHYTIC VEGETATION INDICATORS: 10/0 of dominants OBL. FACW. & FAC: 85% ICheck all indicators that apply & explain below: Regional knowledge of plant communities _X_ Wetland plant list (Nat'1 or regional) ---X_ OTHER_ Physiological or reproductive adaptations Morphological adaptations - h"echnical Literature _X_ Wetland Plant Data Base - Hydrophytic vegetation present? II no Rationale for decision/Remarks: Wetland hydrology and vegetation present. IHvDROLOGY ~s it the growing season? .~ no Water Marks: yes II sediment Deposits: yes 1m lBased on: visual confirmation of plants growing Drift Lines: ves r~ Drainage Patterns: ves-= Oxidized Root (live roots) f;jili::%r11: Local Soil Survey: Eno Ioepth of inundation: inches Channels < 12 in. yes IQ Ioepth to free water in pit: _2_inches Water-stained Depth to saturated soil: inches FAC Neutral: Wt;p:1 yes lllfll re!t'fj;i~ eaves: yes~ !Check all that apply & explain below: Istream, Lake or gage data: _ Other: lAerial ohotoQraohs: Other: Wetland Hydrology present? l~! no Rationale for decision/Remarks: Hydrology matches that of a wetland. I I , I I I I I I I II I I I I II I ;1 I I I SOILS Map Unit Name Alderwood-Sinclair Series & Phase) Taxonomy (Subgroup) _Belfast silt loam (wet variant)_ Drainage Class D Field observations confirm mapped type? yes II Profile Description Matrix color Drawing of soil Depth Horizon (Munsell Mottle colors Mottle abundance Texture, concretions, profile (inches) moist) (Munsell moist) size & contrast structure, etc. (match description) 0-6 A Black Muck 2/1 (10YR) I 0-6" I Black ~ r.... 6-12 B 2/1 (10 YR) I 6-12" I Muck with 12+ C Dark Brown """- Clay 3/2 (10YR) r--.. I 12-18" I Muck with ........ r--.. Even More Clay Hydric Soil Indicators: (check all that apply) Histosol Concretions Histic Epipedon High Organic Content in Surface Layer of Sandy Soils Sulfidic Odor Organic Streaking in Sandy Soils _X_ Aquic Moisture Regime _X_ Listed on Local Hydric Soils List Reducing Conditions Listed on National Hydric Soils List _X_ Gleved or Low-Chroma Colors Other (explain in remarks) Hydric soils present? ,,;,,""5\ ,,ell no Rationale for decision/Remarks: Soil has very low drainage qualities. Wetland Determination (circle) Hydrophytic vegetation present? I no Hydric soils present? no Is the sampling point fa no Wetland hydrology present? no within a wetland? ~ationale/Remarks: Drainage, soils, and vegetation are indicative of a wetland. I I I I I I I I I I I I I I I I I I DATA FORM 1 Routine Wetland Determination (WA State Wetland Delineation Manual or 1987 Corps Wetland Delineation Manual) Project/Site: Old Flagler Road Date: pplicant/ owner: Harold Brown County: nvestigator{s): Mr. G. Bradford Shea; Mrs. Kim Loafman; State: Mr. James McDougall; and Mr. Justin Rondeau SIT /R: o Normal Circumstances exist on the site? IE s the site significantly disturbed (a typical situation)? yes s the area a potential Problem Area? yes GETATION March 31, 2006 Jefferson Washington 1/29N/1 W no mmunity ID: Upland II ransect ID: II Plot ID: VSH-2 Dominant Plant Species Stratum Indicator Dominant Plant Species C-15% FACU C-15% FACU C-5% UPL Oregon grape (Mahonia nervosa) H-15% FACU Bigleaf maple (Acer macrophyllum) HYDROPHYnC VEGETATION INDICATORS: FACU Oceanspray Holodiscus discolor) C-5% Vo of dominants OBL FACW & FAC: 0% heck all indicators that apply & explain below: Regional knowledge of plant communities _X_ hysiological or reproductive adaptations echnical Literature _X_ Stratum Indicator 8-15% FACU 8-15% FACU 8-5% FACU C-5% FACU- 8-5% UPL Wetland plant list (Nat'l or regional) _X_ Morphological adaptations Wetland Plant Data Base OTHER_ ydrophytic vegetation present? Rationale for decision/Remarks: yes II No observed wetland plants at sample point. YDROLOGY yes .. lli;!'1f,s<m;r'): S It the growmg season? e.~ Based on: field observations and time of year no ater Marks: rift Lines: es xidized Root (live roots) hannels < 12 in. yes Depth of inundation: Depth to free water in pit: Depth to saturated soil: inches inches inches heck all that apply & explain below: tream, Lake or gage data: _ erial hoto ra hs: etland Hydrology present? Rationale for decision/Remarks: ther: Other: yes Sample point within an upland area. II ater-stained eaves: yes I ,I I I I I I I I I I I I I I I I I I Alderwood-Sinclair Drainage Class B OILS axonomy (Subgroup) _Cathcart gravelly silt loam_ Field observations confirm mapped type? III no Profile Description Matrix color Drawing of soil Depth Horizon (Munsell Mottle colors Mottle abundance Texture, concretions, profile (inches) moist) (Munsell moist) size & contrast structure, etc. (match description) Dark Brown Silty 0-6 A 3/3 (10YR) I I Sandy 0-6 " ~ Loam Brown ~ 6-12 B 3/6 (lOYR) Silty I 6-12" I Sand 12+ C Light Brown ........... with 4/6 (lOYR) ..... Cobbly Gravel I 12-18" I Sandy ....... ........ Silt Loam Hydric Soil Indicators: (check all that apply) Histosol Concretions Histic Epipedon High Organic Content in Surface Layer of Sandy Soils Sulfidic Odor Organic Streaking in Sandy Soils Aquic Moisture Regime Listed on Local Hydric Soils List Reducing Conditions Listed on National Hydric Soils List _X_ Gleyed or Low-Chroma Colors Other (explain in remarks) Hydric soils present? ~@-m yes D Rationale for decision/Remarks: Soil color, texture, and moisture regime are indicative of upland soils. Wetland Determination (circle) Hydrophytic vegetation present? lWiK'Th'& yes It!' I; Hydric soils present? yes r~& Is the sampling point yes Wetland hydrology present? yes D,~ within a wetland? Rationale/Remarks: Sample point was taken in an upland area.