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Home My WebLink AboutWetland Delineation 501041038 (2) > ., .,Ju 1 28 05 Hr~4S.a The Bosworth Studio 206-545-8433 p.l. ..., :.-' - ~..... ... ~{(,EOS-- ODCJ 7-. 9 To: Jeff Davis (360) 876-1894 & Dave Molenarr (360) 664-0689 & Jeffree Stewart & Greg Ballatd (360) 379-4473 Date: ~ce.-\: ~~O, Ol{ (Ds8 July 28, 2005 ~~~ ~ ,\ . c h ~~~ .- &; 'I ~ ( 0-.010) From: Jill Slevin Bosworth Hoedemake.r t 206.545.8434 f. 206.545.8433 Subject: Driscoll Hoffman Pre-App Site Visit # Pages: 6 (including cover) Hello: Following is the Wetland Determina.tion Report by Ecological Land Services. Hopefully this will help determine who should a.ttend the Pre-App site visit. Please call or e-mail me with the times you are available on August 10th. Thanks, ~ Jill Slevin jill@bosworthhoedemaker.com RECEIVED JUl 2 8 2005 JUftRSDN CRUMlY OCt 1 /InS! 't..Tnt+h It ,th ~.........t ~....i+l.. U.l....h~...nt^.... OS! 1 n':l "lnt:: l::A" QIt ':III of' "lot:: 1;;11" S!A':I':I ~ i. L l l l \ I I J,u 1 2l,k. 05, J.:20l);....S45,-H433"" p.2 BOSI,\IOrt~'l' SturJi 0 INTRODUCTION Ecological Land Services, Inc. (ELS) was contracted by Bosworth-Hoedemaker Architects to delineate any wetlands in proximity to the house on the Driscoll-Hoffinan property, parcel number 501041038, located in a portion of the Southwest ~ of Section 4, TownShip 25 North, Range 1 West, WiIlamette Meridian on the Toandos Peninsula in Jefferson County, Washington (Figure 1). The owners of the property propose to demolish the existing house and build a new one in the same area SITE DESCRIPTION The subject site contains an existing house overlooking Hood Canal to the south. A one lane gravel driveway provides access to the house from both east and north. To the west of the house is a pond, delineated as a jurisdictional wetland, separated by a natural berm from Hood Canal. A concrete boat house is located adjacent to the pond. A driveway provides access to the boat house from the other driveway north of the house. There are low density single family residences to the north, and east of the site. Figure 2 attached~ shows the relative location of these teatures. The house is estimated to be approximately 30 feet higher in elevation than the pond. The pond and house, separated by a driveway and a vegetated slope, are more than 100 feet apart horizontally. The on-site wetland is an open water/emergent wetland that is dominated by burreed (Sparganium sp.) and cattail (Typha lat?folia). The wetland delineation focused on the eastern side of the wetland as it is the closest part of the wetland to the existing house. The edge of the wetland in this area is well-defined and abutted by a maintained mowed area and/or old road fill associated with the access driveway to the boat house and shoreline. METHODS The wetland delineation completed by ELS followed the Routine Determination Method according to the U.S. Army Corps of Engineers, Wetlands Delineation "'fanual (Environmental Laboratory 1987) and the Washington State Department of Ecology, Washington State Wetlands lden/~ficatiDn and Delineation Manual (1997). The Routine Determination Method examines three parameters - vegetation. hydrology. and soils - to determine if wetlands exist in a given area. Hydrology is critical in determining what is wetland. but it is often difficult to assess because hydrologic conditions can change periodically (hourly, daily, or seasonally). Consequently, it is necessary to determine jf hydrophytic vegetation and hydric soils exist. which would indicate that water is present for long enough duration to support a wetland plant community. By definition, wetlands are those areas that are inundated or saturated by surface or ground water at a frequency and duration sufficient to support, and that under nonnal circumstances do support. a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands are regulated as Bosworth Hoedemaker Driscoll- Hoffman Wetland Determination Report I Vl~~,pgical Land Services, Inc. 'e March 3, 2005 - I - " " N COUNTY >, )Ju 1 2tj' 05 1'0:45a" _...-:-:-- ;Tfll!,rabsw,.~rf.~h,' StiUi'(j i 0 ,'~ tJ t3':tS'4;S"i5 8 4 3 3: p .'$) . "Waters of the United States" by the U.S. Army Corps of Engineers, as "Waters of the State" by the Washington State Department of Ecology, and locally by Chapter 18.1j Jefftrson County Code (JCC) of Jefferson County, Washington. ELS evaluated the property on 25 January, 2005. An open water/emergent wetland was delineated in the southeast portion of the property, west of the existing house. The eastern side of the wetland was flagged with fluorescent..orange flagging and pin flags. Vegetation. hydrology, and soil data were collected from paired test plots to verify the wetland boundaries (see attached). VEGETATION Dominant vegetation found on-site is recorded on the attached routine wetland detennination data sheets. The indicator status, following the scientific names, indicates the likelihood of the species to be found in wetlands. Listed from most likely to least likely to be found in wetlands, the indicator status categories are: . OBL (obligate wetland) - occur almost always (estimated probability >99%) under natural conditions in wetlands. . FACW (facultative wetland) - usually occur in wetlands (estimated probability 670/0- 99%). but occasionally found in non-wetlands. . FAC (facultative) .. equally likely to occur in wetlands or non-wetlands (estimated probability 34%-66%). . FACU (facultative upland) - usually occur in non-wetlands (estimated probability 67%- 99%), but occasionally found in wetlands (estimated probability 10/0-33%). . UPL (obligate upland) - occur almost always (estimated probability >99%) under natural conditions in non-wetlands. . NI (no indicator) - insufficient data to assign to an indicator category. The on-site portion of the wetland is predomin~tely open water with some emergent vegetation present. The dominant vegetation species are burreed (Sparganium sp., GBL). common cattail (Typha latifolia, OBL) and spike rush (Scirpus atrocinctus, OBL). The uplands are dominated by an overstory canopy of Douglas fir (Pseudo/suga menziesii~ F ACU) and western red cedar (Thuja plicata. F AC), with a mid-understory layer of evergreen huckleberry (V accinium ova/um, F ACU). and with a mixed herbaceous layer of swordfem (Polys/ichum munirum. F ACU and salal (Gaultheria shallon. F ACU) in the low understory. RECEIVED Bosworth Hoedemaker Driscoll- Hoffman Wedand Oetennination Report JUl 2 8 JUftR~n~ tUU>>TI1lt1fgiCal Land~;;~Cu~j -2- ;;,t.Ju1?,(J.; 05:,1:0: 45'.1! Th e;.B';j,~ O)'i'(t h 1St ad i 0< ;\~.., 206"'5"4'5," .'~.,e,'4'.33',;':;;{ :".,'..,.~".,':,,;p,::{i.'4' RECEIVED l I 1 I I I l 1 I SOILS _0 The on-site soils of the delineated wetland area are mapped as Cassolary-Everett complex (ChD) J~30 % slopes, as referenced by the V.S.D.A. Soil Conservation Service for Jefferson County Area, Washington (1975) (Figure 3). . The Cassolary-Everett soils are about 60 percent Cassolary sandy loam and 40 percent Everett gravelly sandy loam. The Cassolary series consists of well-drained soils on upland terraces and were formed in reworked glacial and marine sediments. The State of Washington Hydric Soils List for Washington does not identify the Cassolary-Everett soils as hydric (Soil Conservation Service 1995). Mapped hydric soils do not necessarily mean that the area is a wetland; hydrology, wdland vegetation, and hydric soils must all be present to classify an area as a wetland. Conversely, wetlands may be found in areas where the soils are not mapped as hydric. The upland soil in Test Plot 1 exhibited a mixed clay loam and silt loam soil type. The plot did not confirm the mapped soil type however the test pit waS dug in an area from which the existing road was excavated out of the slope, therefore it may have been originally subsoil. Test Plot 2 within the wetland was inundated with water and therefore no soil test pit was dug. HYDROLOGY The delineated wetland \\-1lS inundated by water an estimated 0.5 to 2.5 feet deep. WETLAND INVENTORIES NATIONAL WETLANDS INVENTORY The National Wetlands Inventory (NWI) mapped the on-site wetland as a palustrine unconsolidated bottom permanently flooded wetland (PUBHH) (Figure 4). The ELS- delineated wetland concurs with the NWL As a cautionary note, NWI maps are typically used to gather information about a regional area and are somewhat limited in accuracy for smaller sites because of the large scale used with the maps. CONCLUSIONS ELS delineated the boundary of one emergent wetland located on-site west of the existing house. The wetland boundaries were based primarily on a change in vegetation, obviolls. hydrology and a break in topography. The wetland is dominated by obligate wetland (OBL) herbs. The soils were inundated with water and assumed hydric. The wetland is located in a depression that is lower in elevation than the surrounding uplands. The wetland is maintained by ground water and surface water from a small stream draining from the north. Bosworth Hoedemaker DriscoU- Hoffman Wetland Determination Report Ecological Land Services. Inc. March 8. 2005 -3- i',>)",'1""""':;;" .n 0 "',' . ,',", "0 "4 5 ',""," ,:' :,' ~'~,' ",;,-,-g,,~, ....'.'. - -~~ I I I I I I I I I ! ! L 1 11 to. I; to. t ... r 1: ... II. :{;he' Bbs'w"or~.h(;'S''t!ud io~\;;' ~_.. ' , "~' 20 6 :~5 4 5- 84'33/" i;.p",.'~:: The upland buffers adjoining the wetland are dominated by facultative upland (F ACU) and facultative (FAC) trees, shrubs, and herbs. The evaluated upland soils are well-drained and lacked hydric soil indicators. The existing buffer between the house and the wetland is already partially disturbed by on-going lawn mowing, an access road, a trail from the house to the shore, and a concrete boat shed. WETLAND CATEGORIZATION AND BUFFERS The on-site wetland was categorized as a Category II wetland accotding to the Wetland Rating Form for Western Washington (Washington Department of Ecology, 2004). Please see rating fonn attached. In accordance with Jefferson County Code 18.15.340, Table 3-4. Category II wetlands require a standard buffer width of 100 feet. The location of the buffer is depicted on the Site Map attached (Figure 2). Demolition and reconstruction of the existing house will not occur within the required buffer. Furthermore. the existing buffer has been interrupted by on-going and existing disturbances as documented above, therefore it does not function as a naturally undisturbed buffer. This report documents the standardized scientific investigation. best professional judgment, and conclusions of ELS and it is our opinion that it should agree with local. state, and federal regulatory agencies. , C~ r~J~U .~ J'Jt ," ,,\Wi \\t' ~\\\\,,~~\ t\\J ' Bosworth Hoedemaker OriscoU- Hoffman Wetland Determination Report Ecological Land Services., Inc. March 8. 2005 -4- ':;u,!la~,/n:=j:. 10;;,46'a.. · .:~he ffo'.swort'h.~S~i.l,'(ltd2<,: 2()S;.!545-8'4'33 Lp'~~ 6 I I I I I I I I I I I I I I I I Leaend: I. ...1 ~ TO> 1C~ f("" 1f~11 Jl'" ll2-J ~ / L,.. J. Wetland Driveway Existing Trail Test Plot o 100 200 I I II I I SCALE IN FEET SCALE IS APPROXIMATE " ...... " TP-1 . ~ I I DATE :l-7-05 DWN. .lIT APPR PROJ. # 1125.01 Figure 2 SITE MAP Driscoll - Hoffman Wetland Bosworth Hoedemaker Jefferson County, Washington Section 4 Townshi 25N Ran e 1W W.M. . ECOLOGICAL LAND SERVICES. INC. NAlURAL RESOURCE CONSULTING AND LAND PLANNING 1157 3rd Avenue Suite 220 langview, WA 98632 (360) 578-1371 Fax: (360) 414-9305