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Home My WebLink AboutSWP2703061_6e Wetland Delineation East Valley Road and Area South of SW I r Street Renton, Washington March 1997 SOUTHWEST 19TH & LIND PROJECT LPN Architecture & Planning, Inc, 1201 Fourth Avenue South, Suite 102 Seattle, Washington 98134 NRCNATURAL RESOURCE CONSULTING Assessment, Management and Regulatory Permitting 5125 NORTH DEFIANCE, P.O. BOX 7208 TACOMA, WASHINGTON 98407 (206) 756-0370 FAX: (206) 756-0155 H-1006-01 EXECUTIVE SUMMARY The findings and conclusions presented in this report are based on an interpretation of information currently available to Natural Resource Consulting. This summary is for introductory purposes and should be used only with the full text of this report. This wetland delineation was based on the On -Site Determination Method described in the Corps of Engineers Wetland Delineation Manual (1987). Based on the information derived through site reconnaissance and readily available documents, Palustrine forested, scrub -shrub, emergent, open water, seasonally flooded/permanently saturated wetland communities exist on the site. The wetland would be classified as a Very High Quality, Category 1 Wetland using the City of Renton Wetland Management Ordinance. The wetland would meet this classification because it is greater than ten acres in size and has three or more vegetation classes, one of which is open water. We understand that this property is not proposed to be developed but may be the receiving water for storm water discharges from the parcel north of this site when it is developed. New surface water discharges, to Category 1 wetlands, from detention facilities, pre -settlement ponds or other surface water management structures are allowed provided that the discharge meets the requirements of the City of Renton Storm and Surface Water Drainage Ordinances, and provided the discharge will not result in a significant change in water temperature or chemical characteristics of the wetland. The wetland generally has moderate to high functions and values due to its size (over 10 acres), and structural diversity. H-1006-01 TABLE OF CONTENTS Page EXECUTIVE SUMMARY .................................................... i 1.0 INTRODUCTION......................................................1 1.1 Scope of Services .................................................. 1.2 Site Location and Description .......................... . ............. 1 2.0 DOCUMENT REVIEW .................................................. 2 2.1 U.S. Fish and Wildlife Service National Wetland Inventory Map ............... 2 2.2 City of Renton Wetland Inventory ..................................... 2 2.3 Soil Conservation Service Soil Survey of the King County Area ............... 2 3.0 SITE RECONNAISSANCE ............................................... 2 3.1 Site Conditions During Site Visit ...................................... 2 3.2 Topography......................................................3 3.3 Fauna...........................................................3 3.4 Vegetation.......................................................3 3.5 Soils............................................................3 3.6 Hydrology.......................................................3 4.0 WETLAND AREA ...................................................... 4 5.0 WETLAND FUNCTIONS AND VALUES .................................... 4 5.1 Biologic Functions ................................................. 4 5.2 Hydrologic Functions ............................................... 5 6.0 WETLAND REGULATION ............................................... 5 7.0 CONCLUSIONS........................................................ 5 8.0 CLOSURE............................................................5 REFERENCES............................................................7 ii H-1006-01 iJ TABLE OF CONTENTS (continued) LIST OF TABLES Table No. 1 Vegetation Species Identified On the Site 2 Results of the Triple Parameter Approach for Each Data Point LIST OF FIGURES Figure No. 1 Vicinity Map 2 Site Map 3 Soil Conservation Service Map LIST OF APPENDICES APPENDIX A WETLAND DELINEATION METHODOLOGY APPENDIX B DEFINITION OF PLANT INDICATOR STATUS AND FIELD SHEETS APPENDIX C MODIFIED REPPERT WETLAND VALUES EVALUATION SHEET ui H-1006-01 WETLAND DELINEATION REPORT EAST VALLEY ROAD AND SW 19 `" STREET PROJECT RENTON, WASHINGTON 1.0 INTRODUCTION Natural Resource Consulting has completed a wetland delineation for the East Valley Road and SW 19`' Street Project located on the southwest corner of said intersection in Renton, Washington (Figure 1). This work was performed to assist in site planning related to the sites potential to receive storm water discharges from a parcel north of this site. 1.1 Scope of Services The scope of work for this study was limited to the following tasks: ► Review of federal and local regulations pertaining to the wetland identified on the subject site. The review was used to classify the on -site wetland. ► A visual assessment to observe existing site conditions and to identify and flag the wetland located on the site. This was accomplished using field procedures consistent with the Corps of Engineers Wetland Delineation Manual (1987) (Appendix A). ► A review of documents readily available, including local wetland inventory maps, U.S. Fish and Wildlife Service National Wetland Inventory Maps, and the Soil Conservation Service Soil Survey of the King County Area. ► Assessment of the identified wetland to help determine the overall functions and values of the wetland. ► A report documenting the process, findings, and conclusions for this project. 1.2 Site Location and Description The square -shaped site contains approximately 11 acres. It is located on the southwest corner of the intersection of Southwest 19' Street and East Valley Road, Renton, Washington (Figure 1). The property is located in the southwestern quarter of Section 19, Township 23 North, Range 5 East. The site is bounded on the north by Southwest 19'h Street, on the east by East Valley Road, on the south by a storage facility and more wetlands, and on the west by fire station #14 currently under construction. H-1006-01 The site contains Palustrine forested, scrub -shrub, emergent, open water, seasonally flooded/permanently saturated wetland communities that would be classified as a Very High Quality, Category 1 Wetland using the City of Renton Wetland Management Ordinance (Figure 2). 2.0 DOCUMENT REVIEW 2.1 U.S. Fish and Wildlife Service National Wetland Inventory Map The U.S. Fish and Wildlife Service National Wetland Inventory Map of the Renton, Washington Quadrangle, 1:24,000 scale (1988), identifies a Palustrine forested, scrub -shrub, emergent, open water, seasonally flooded/permanently saturated wetland. 2.2 City of Renton Wetland Inventory The City of Renton Wetland Inventory (1992) identifies the on -site wetland as W-7, a Palustrine emergent/scrub-shrub wetland community located in the Valley Subbasin. Further comments in the inventory indicate that the wetland has "good structural diversity and structure, and is a good quality wetland". 2.3 Soil Conservation Service Soil Survey of the King County Area The U.S. Soil Conservation Service Soil Survey (SCS) of the King County Area, Washington (1973), was reviewed to determine the general nature of soils on the subject site. The site is mapped as containing Puget silty clay loam (Figure 3). The following soils information was taken from the SCS 1973 publication. The Puget series is a poorly drained soil found in depressions of river valleys. Typically, the soil is dominantly mottled dark grayish -brown and grayish brown silty clay to a depth of 45 inches. Often found in this unit is as much as 10 percent of Woodinville and Snohomish soils. The seasonal high water table is at or near the surface. Puget silty clay loam is listed by the Washington State and King County SCS as hydric (wetland) soil. 3.0 SITE RECONNAISSANCE 3.1 Site Conditions During Site Visit On February 20t', 1997, Ms. Theresa Henson with Natural Resource Consulting visited the subject site to delineate and evaluate the wetland. The site visit included a visual observation of the subject site and surrounding area. Vegetation, soils, and hydrologic conditions on the site appear to be fairly stable. The wetland appears to be a remnant of a historically larger wetland system. The edges of the wetland contain 2 H-1006-01 fill slopes with roads and parking areas near the tops of the slopes except in the southwest corner of the site where the wetland continues to the south and west off site. The on -site portion of the wetland is approximate is 10.8 acres in size and the total wetland system is approximately 14 acres in size. The functions and values on the wetland were evaluated using a Modified Reppert Wetland Values Evaluation for (Appendix D). 3.2 Topography Based on topographic data provided by Barghausen Consulting Engineers, Inc., and the Austin Company, topographic relief on the site ranges from approximately 16 feet near the boundaries of the site to 8 feet in the lower portions of the open water systems. 3.3 Fauna Several species of songbirds were observed on the site. Evidence of various animal species on the site was also noted. Rabbit pellets and coyote scat were observed on the ground just south of the wetland off -site, on an old dirt road. Mallards, and dowitchers were seen in the wetland. No plant or animal species, listed federally or by the state as threatened or endangered, were observed on or near the site. 3.4 Vegetation Four representative data plots were established to document plant species and dominance of vegetation on the subject property (Figure 2). The vegetative species composition varied from a black cottonwood forest along the north, south and west edges of the wetland to a mixture of emergent vegetation dominated by cattails, and sedges to a scrub -shrub system dominated by willow, and red osier dogwood. The wetland plant communities are predominantly the shrub and emergent areas and the uplands are predominantly composed of the forested community. Data forms detailing observations for vegetation are included in Appendix B. 3.5 Soils During the site reconnaissance, soil conditions, including color, texture, and relative moisture content, were observed and recorded at two of the four data plots on the subject site. The indicators used to identify hydric soils can be found in Appendix A Soil types observed on the site ranged from silt loams to silty clay loams within the wetland and gravelly sandy loam fills in the uplands. Field sheets detailing observations for soils are included in Appendix B. 3.6 Hydrology Hydrologic conditions, including saturated soils, as well as indicators of wetland hydrology as defined by the 1987 Manual, were observed with two of the four data plots (Appendix A). H-1006-01 Generally the site contains saturated soils near the edges of the wetland and ponded water throughout the rest of the wetland. The southwest portion of the wetland contains a larger open water pond, several other smaller pond are also located throughout the wetland. A culvert located along the western property boundary empties into the wetland from the new fire station storm water ponds. A concrete culvert located along the northwestern property line near the northwestern corner of the site provides the only discharge from the wetland visually observed during the site visit. The culvert is not identified on the City of Renton Surface Water Drainage System Maps. It appears that the culvert connects to the drainage system in SW 191h Street and flows west towards Springbrook Creek and the P-1 Channel. Field reconnaissance of the site was conducted during the wet time of the year following a period of heavy rain. For this reason, the water table is not expected to rise much higher than the observed level unless a large flood event occurs. Areas in which the data points did not indicate wetland hydrology were classified as upland areas. 4.0 WETLAND AREA Based on the use of the triple -parameter approach defined within the 1987 Manual, one wetland was identified on the subject property. Vegetation species were identified and classified with a Wetland Indicator Status (WIS), soil conditions were identified and labeled, and observations of hydrologic conditions were made at 4 data points on the site. The wetland was classified as such because all three wetland parameters were present (Table 2). According to the classification system developed by the U.S. Fish and Wildlife Service (Cowardin et al., 1979), the wetland habitats on the site would be classified as Palustrine forested, scrub -shrub, emergent, open water, seasonally flooded/permanently saturated communities. Dominant vegetation within the wetland is comprised of willows, red osier dogwood, salmonberry, cattails, sedges, and reed canarygrass. The WIS for these species ranges from Facultative Wetland (FACW) to Obligate (OBL), which indicates plant species that have a high probability of being found in wetland areas, as such, they are considered wetland species (Appendix B). Soils were very dark in color and in many areas within the wetland had high organic content indicative of hydric (wetland) soil conditions. At least 50 to 60 percent of the wetland contained ponded water from one inch to six feet deep. The remainder of the wetland contained saturated soils at or near the ground surface. 5.0 WETLAND FUNCTIONS AND VALUES A Modified Reppert Wetland Values Evaluation form was completed for the project (Appendix D). The general biologic and hydrologic functions of the wetland are described below. 5.1 Biologic Functions The wetland in the project area provides generally high biologic functions. The general habitat contains diverse forested, shrub and emergent plant communities with downed logs, snags and low fill slope banks with vegetative cover. The wetland has some limitation due to its isolated 4 H-1006-01 condition. It is not directly connected to other habitat areas and is surrounded by either roads or developed areas. 5.2 Hydrologic Functions The wetland in the project area provides moderate to high hydrologic functions. In general the system is an isolated remnant of a historically larger wetland. Its only interconnection with other waters is through pipes in the City of Renton Storm water system. The system does retain surface water runoff during flood events. The system does receive runoff from non -point sources such as roads and storm water ponds, and the wetland structure does provide water purification functions. 6.0 WETLAND REGULATION The wetland would be classified as a Very High Quality, Category 1 Wetland using the City of Renton Wetland Management Ordinance. The wetland would meet this classification because it is greater than ten acres in size and has three or more vegetation classes, one of which is open water. We understand that this property is not proposed to be developed but may be the receiving water for storm water discharges from the parcel north of this site when it is developed. New surface water discharges, to Category 1 wetlands, from detention facilities, pre -settlement ponds or other surface water management structures are allowed provided that the discharge meets the requirements of the City of Renton Storm and Surface Water Drainage Ordinances, and provided the discharge will not result in a significant change in water temperature or chemical characteristics of the wetland. The U.S. Army Corps of Engineers (Corps) does regulate flooding of wetland systems under Section 404 of the Clean Water Act. The Corps should be notified if storm water discharges will alter water levels within the wetland system or if construction of new storm water outfall structures are proposed in the wetland. 7.0 CONCLUSIONS Based on the Corps' 1987 Manual, vegetation, soils, and hydrologic conditions necessary for an area to be considered wetland were found throughout a majority of the site. The on -site wetland generally has moderate to high functions and values due to its size (over 10 acres), and structural diversity. The wetland habitats on the site would be classified as Palustrine forested, scrub -shrub, emergent, open water, seasonally flooded/permanently saturated communities, and would be classified as a Very High Quality, Category 1 Wetland using the City of Renton Wetland Management Ordinance. 8.0 CLOSURE The findings and conclusions documented in this report have been prepared for specific H-1006-01 application to this project. They have been developed in a manner consistent with that level of care and skill normally exercised by members of the environmental science profession currently practicing under similar conditions in the area. Our work was also performed in accordance with the terms and conditions set forth in our proposal dated February 13', 1997. The conclusions and recommendations presented in this report are professional opinions based on an interpretation of information currently available to us and are made within the operation scope, budget, and schedule of this project. No warranty, expressed or implied, is made. Wetland boundaries identified by Natural Resource Consulting are considered preliminary until the flagged wetland boundaries are validated by the Corps and/or the local jurisdictional agency. Validation of the wetland boundaries by the regulating agency(s) provides a certification, usually written, that the wetland boundaries verified are the boundaries that will be regulated by the agency(s) until a specific date or until the regulation are modified. Only the regulating agency(s) can provide this certification. Since wetlands are dynamic communities affected by both natural and human activities, changes in wetland boundaries may be expected; therefore, wetland delineations cannot remain valid for an indefinite period of time. The Corps typically recognizes the validity of wetland delineations for a period of five years after completion. Development activities on a site five years after the completion of this wetland delineation report may require revision of the wetland delineation. In addition, changes in government codes, regulations, or laws may occur. Because of such changes, our observations and conclusions applicable to this site may need to be revised wholly or in part. NATURAL RESOURCE CONSULTING L�'- &4A— T eresa R. Henson Natural Resource Ecologist H1006.01.RPT 6 H-1006-01 REFERENCES Cowardin, L.M., V. Carter, F.C.Golet, and E.T. LaRoe, 1979, Classification of Wetlands and Deepwater Habitats of the United States, U.S. Fish and Wildlife Service Publication FSW/OSB-79/31. Environmental Laboratory, 1987, Corps of Engineers Wetlands Delineation Manual Technical Report Y-87-1, U.S. Army Waterways Experiment Station, Vicksburg, Mississippi. Muncell Soil Color Chart, 1994, Rev. ed.: Baltimore, Maryland, Kollmorgen Instruments Corporation. Reed, P.B., Jr., 1988, National List of Plant Species that Occur in Wetlands: Northwest (Region 9), U.S. Fish and Wildlife Service Biological Report 88 (26.9). Renton, 1992, Ordinance No. 4346, Chapter 32 Wetland Management, Renton, Washington. Reppert, R.T., W. Sigleo, E. Stakhiv, L. Messman, and C. Beyers, 1979, Wetland Values Concepts and Methods for Wetland Evaluations: U.S. Army Corps of Engineers, Institute for Water Resources, Fort Belvoir, Virginia. U.S. Department of Agriculture, Soil Conservation Service, 1973, Soil Survey of the King County Area, Washington, U.S. Fish and Wildlife Service, 1988, National Wetland Inventory Map, Renton, Quadrangle, Washington. 7 H-1006-01 TABLE I VEGETATION SPECIES IDENTIFIED ON THE SITE TREES Black Cottonwood Populus trichocarpa Red Alder Alnus rubra Willow Spp. Salix spp. SHRUBS Himalayan Blackberry Rubus discolor Red Osier Dogwood Comas stolonifera Salmonberry Rubus spectabilis Scot's Broom Cytisus scoparuis HERBS Orchard Grass Dactylis glomerata Reed Canarygrass Phalaris arundinacea Rush Spp. Juncus spp. Sedge Spp. Carex spp. Stinging Nettle Urtica dioica Note: This listing represents the major plant species identified. There may be other species present on within the subject site that are not listed. H-1006-01 TABLE 2 RESULTS OF THE TRIPLE -PARAMETER APPROACH FOR EACH DATA POINT Data Point Wetland Vegetation Hydric Soils Wetland Hydrology Wetland Determination I YES YES YES WETLAND 2 YES NO NO UPLAND 3 YES YES YES WETLAND 4 YES NO NO UPLAND H-1006-01 Approximate Scale 1 inch to 4800 feet Note: Map adapted from The Thomas Guide, 1995. N East Valley Road and SW 19t" Street Project Renton, Washington _ A VICINITY MAP March 1997 H-1006-01 Natural Resource Consulting FIG. l Assessment, Maoagenxnt and RcSoWory Pemvttmg Approximate Scale 1 inch to 2,000 feet Note: Soil Conservation Service Map for the King County Area (1973). N East Valley Road and SW 19' Street Project ARenton. Washington SOEL CONSERVATION SERVICE MAP March 1997 H-1006-01 Natural Resource Consulting FIG. 3 Asa mmmt, Minaaemeat and Rcgu6ton Pcrmitting APPENDIX A WETLAND DELINEATION METHODOLOGY H-1006-01 APPENDIX A WETLAND DELINEATION METHODS The triple parameter approach of the Corps of Engineers Wetland Delineation Manual(1987) was used to delineate the extent of wetlands on the site. Under this methodology, vegetation, soils, and hydrology are each evaluated to determine the presence or absence of wetlands. Based on the use of this method, an area is considered to be a wetland if each of the following are met- (1) dominant hydrophytic vegetation is present in the area, (2) the soils in the area are hydric, and (3) the necessary hydrologic conditions within the area are met. The Routine On -Site Determination Method described in the Corps of Engineers Wetland Delineation Manual, were used for the evaluation of triple parameter criteria for this project. This methodology was selected because differences in vegetation types were easily observed, aiding in the identification of areas likely to meet the hydrology and soils criteria of the triple parameter approach. Wetland boundaries were determined by conducting a walking inspection of the property. As part of this inspection, species of vegetation, soil conditions, and hydrologic conditions were noted at several data plots to more accurately determine the boundaries of on -site wetlands. Wetland Vegetation Hydrophytic plants are plants specially adapted for saturated and/or anaerobic conditions. The U.S. Army Corps of Engineers and the U.S. Fish and Wildlife Service has assigned an indicator status to many plant species that is based upon the estimated probability of the species existing under wetland conditions. Plants are categorized as Obligate (OBL), Facultative Wetland (FACW), Facultative (FAC), Facultative Upland (FACU), and Upland (UPL). Species with an indicator status of OBL, FACW, or FAC are considered to be adapted to saturated and/or anaerobic (i.e., wetland) conditions and are referred to as hydrophytic vegetation (Appendix B). Trees and shrubs within a 30-foot radius and herbs within a 5-foot radius of each data plot were identified and noted. The approximate percentage of cover for each of the different plant species occurring within the tree, shrub, and herb strata was determined. Dominant plant species are considered to be those that, when cumulatively totaled in descending order of abundance, exceed 50 percent of the areal cover for each vegetative stratum. Any additional species individually representing 20 percent or greater of the total areal cover for each vegetative stratum are also considered dominant. A -1 H-1006-01 The indicator status of the dominant plant species within each of the vegetative strata are used to determine the presence of hydrophytic vegetation near each data plot. A data plot was considered to have hydrophytic vegetation if greater than 50 percent of the dominant plant species within the area had an indicator status of OBL, FACW, or FAC. Hydric Soils Hydric soils are defined as those soils which are saturated, flooded, or ponded long enough during the growing season to develop anaerobic conditions that favor the growth and regeneration of hydrophytic vegetation. As a result of anaerobic conditions, hydric soils exhibit characteristics directly observable in the field, including high organic matter content, greenish or bluish grey color (gley formation), accumulation of sulfidic material, spots of orange or yellow color (mottling), and dark soil colors (low chromas). Throughout a large portion of the area delineated as wetland, identification of hydric soils was aided through observation of surface hydrologic characteristics and indicators of wetland hydrology (i.e., drainage patterns). The areal extent of hydric soils was defined through direct soil observation within several data plots placed both inside and outside the wetland. Soil observations were completed within soil data plots dug with a shovel to a depth of at least 16 inches below the existing ground surface. Soil samples were examined for the presence of hydric indicators. Soil organic content was estimated visually and textually. The presence of sulfidic material was determined by the presence of sulfide gases (i.e., a "rotten egg" odor). Soil colors were recorded after being determined through use of the three aspects of color in the Munsell Soil Color Chart: hue, value and chroma (e.g., a soil designated as IOYR 6/2 has a hue of IOYR, a value of 6, a chroma of 2, and a soil color name of light brownish gray). A soil chroma of two in combination with soil mottling or a soil chroma of one without soil mottling typically indicates a hydric soil. Wetland Hydrology Hydrologic conditions identifying wetland characteristics occur during those periods when the soils are inundated permanently or periodically, or the soil is continuously saturated to the surface for sufficient duration to develop hydric soils and support vegetation typically adapted for life in periodically anaerobic conditions. Research has indicated that duration of soil saturation and inundation during the growing season is more influential on the plant community than the frequency of soil saturation and inundation during the growing season. For the purposes of this A -2 H-1006-01 wetland delineation, the wetland hydrology criterion was considered to be satisfied if it appeared that wetland hydrology was present for at least 5 to 12 percent (12 to 29 days) of the growing season. The growing season begins when the soil reaches a temperature of 41 degrees Fahrenheit in the zone of root penetration. The hydrology was evaluated by direct visual observation of surface inundation or soil saturation within 16 inches below the existing ground surface in data plots. According the 1987 Manual, "for soil saturation to impact vegetation, it must occur within a major portion of the root zone (usually within 12 inches of the surface) of the prevalent vegetation." Therefore, if saturated soils or indicators were observed within 12 inches of the surface, positive indicators of wetland hydrology were noted. The area near each data plot was also examined for indicators of wetland hydrology. These indicators include dried water marks, drift lines, sediment deposits, and drainage patterns. It was not possible to observe conditions during the entire growing season. Areas where positive indicators of hydrology were noted were assumed to contain wetland hydrology. A -3 H-1006-01 APPENDIX B DEFINITION OF PLANT INDICATOR STATUS AND FIELD DATA FORMS H-1006-01 APPENDIX B DEFINITION OF PLANT INDICATOR STATUS AND DATA FORMS Indicator Category Definitions OBL Obligate Wetland. Occurs almost always (estimated probability >99%) under natural conditions in wetlands. FACW Facultative Wetland. Usually occurs in wetlands (estimated probability 67-99%), but occasionally found in uplands. FAC Facultative. Equally likely to occur in wetlands or uplands (estimated probability 34-66%). FACU Facultative Upland. Usually occurs in uplands (estimated probability 67- 99%), but is occasionally found in wetlands (estimated probability 1- 33%). UPL Obligate Upland. Occurs in wetlands in other regions (as defined in the National List of Scientific Plant Names), but occurs almost always (estimated probability >99%) under natural conditions in uplands :in the region specified. NI No Indicator. These species have not been given an indicator status. They are assumed to be upland. Source: National List of Plants That Occur In Wetlandv: Northwest (Region 9). U. S. Fish and Wildlife Service Biological Report 88 (26.9). 89 pp. H-1006-01 Data Point: I of � DATA FORM ROUTINE WETLAND DETERMINATION Project/Site: F V lie y 4 5 W 19 5 t' • Date: 2- 2 0- 99 7 Applicant/Owner: L,PrI -4r�h . City: K e nil -on Investigator T' R 1+ Job # H - 1 v o G - 0 1 County %C; nt, State: W Have vegetation, soils, or hydrology been disturbed: Yes Is the area a potential Problem Area: Yes (If needed, explain on reverse.) VVCV7s"nN Dounnant Plant Species Stratm % Cover L Pha1Ar;s u► H go 2. T fiu. H -40 3. o0xX%^S -r 20 4. 5aa1'Y Sp T to 5, Ulg-t:ca. a;'0"C0. H Trwct 6. 7. 8. Percent of Dominant Species that are OBL, FACW or FAC (except FAC-). *-Dominant Cowardin Classification: Pa l k5 t'+' A Remarks: M a n 1J 5 A14. J S sjv-nx? 11 nV V Recorded Data (Describe in Remarks): _ Stream, Lake, or Tide Gage Aerial Photograph _ Other No Recorded Data Available Field Observations: Indicator Dominant Plant Species Stratum % Cover FAe-►J 1. 03 L 2. FA C 3. FIA c.4J 4. FAC} 5. 6. 7. 8. Depth of Surface Water: l (in.) Depth to Free Water in Pit: (in.) Depth to Saturated Soil: G (in.) Remarks: 100,2 Scr,&.-s�r"/twsaret�r,i Wetland Hydrology Indicators Inundated x Saturated in Upper 12 Inches _ Water Marks Water Lines _ Sediment Deposits _ Drainage Patterns in Wetlands _ Oxidized Root Channels in Upper 12 Inches Water -Stained Leaves Local Soil Survey Data Other (Exbiam in Remarks) Indicator Data Point: J of y SOILS Map Unit Name: lea a5 ,* li w G l Drainage Class: Poot-I v ru; r►¢A Field Observations'' Taxonomy (Subgroup): Confirm Mapped Type? No Profile Descri ion Depth Matrix Color Mottle Colors Mottle Texture, Concretions, (inches) (Munsell Moist) (Munsell Moist) RhuospUres. etc. O - 10 10,49 9112 10 '1 R 51 L ►+� � 5 ��'� i oa w� — ►v - Hydric Soil Indicators: _ Histosol _ Concretions Histic Epipedon _ High Organic Content in Surface Laver _ Sul6dic Odor _ Organic Streaking Probable Agtnc Moisture Regime X Listed on Local Hydric Soils List �( Reducing Conditions X Listed on National Hydric Soils List _2C Gleyed or Low-Chroma Colors _ Other (Explain in Remarks) Remarks: WETLAND DETERMINATION Hydrophytic Vegetation Present? (:TFS) No Hydric Soils Present? ® No Is this Data Point Within a Wetland? �) No Weiland Hydrology Present? No Remarks: 2-97/DATA.FRiWCRH trh Data Point: .2 of `/ DATA FORM ROUTINE WETLAND DETERMINATION Project/Site: E. JIke r S LJ 1.9 S+ . Date 2-20- 9 7 Applicant/Ownev 4. P i9 +'c h . City: ernto ✓1 Investigator. Tot N Job #: H -1006 -0 1 County: k"Ij a_ Have vegetation, soils, or hydrology been disturbed: Yes State: w,A— Is the area a potential Problem Area: Yes (If needed, a lain on reverse.) VEGETATION Dominant Plant SMies Stratum % Cover Indicator Dominant Plant Species Stratum % Covtu Indicator 1.P6vl.�;s as.4nd, �� 5D PA ") 1. 2. Pop�IMs Tr�c4o, �_ 110 _f'r9t 2. 3, u.�; co. a�o�aw �_ 10 Pot+ 3. 4.D.te-I,I,sSlorhtr.L}oH 10 FA<kA. 4. 5. 5. 6, 6. 7. 7. 8. -- 8. Percent of Dominant Species that are OBL, FACW or FAC (except FAC-). *-Dominant species. 10 Oq Cowardin Classification: L)L Q (a►rr1 Remarks. 207a o e rl HYDROLOGY Recorded Data (Describe in Remarks): Wetland Hydrology Indicators N 0 ►1-0__ Stream, Lake, or Tide Gage _ Aerial Photograph Inundated _ Other Saturated in Upper 12 Inches _ No Recorded Data Available Water Marks Water Lines Sediment Deposits Drainage Patterns in Wetlands Field Observations: o 0(in.) Oxidized Root Channels in Upper Depth of Surface Water: 12 Inches Depth to Free Water in Pit: _� (in.) Water -Stained Leaves Depth to Saturated Soil: 0_ (in.) Local Soil Survey Data Other n in Remarks Remarks: Data Point. 2 of y SOILS Map Unit Name: I, We -it tf Drainage Class: i Aa d Field Observations Taxonomy (Subgroup) Confirm Mapped Type? No Profile Descrirnion: Depth Matrix Color Mottle Colors (inches) (Munsell Moist) Mottle Texture, Concretions, $eves. etc. a_2o goy R i13.. `�— , ar�a,T oellJ s�.nd�lo4,n� Hydric Soil Indicators: Histosol Concretions Histic Epipedon High Organic Content in Surface Layer Sulfidic Odor Organic Streaking Probable Aquic Moisture Regime Listed on Local Hydric Soils List Reducing Conditions Listed on National Hydric Soils List Gleyed or Low-Chroma Colors Other (Explain in Remarks) Remarks: WETLAND DETERMINATION Hydrophytic Vegetation Present? No Hydric Soils Present? es 6P is this Data Point Within a Wetland? Yes GD Weiland Hydrology Present? Yes Remarks: 2-97,DATA.FR.Tv T Htrh Data Point: 3 of DATA FORM ROUTINE WETLAND DETERMINATION Project/Site: Z. J 11 e i S W pi 5t Date: -'k -'Z 9- 9 7 Applicant/Owner. it P Id 'A 1 c k City: R e ri f o -i Investigator: T2 N Job #: H -Io o b - 0 ( County: 1[_ State. �} Have vegetation, soils, or hydrology been disturbed: Yes Is the area a potential Problem Area: Yes If needed, explain on reverse. VEGETATION Dominant Plant S=ies Stratum % Caver IIIdicatQr Dominant Plant Species SStar % Cove Indicator 1. 1?h"1ar.g a�yflci�N. 100 PAC U) 1. 2. 2. 3. 3, 4. 4. 5. 5. 6. 6. 7. 7. 8. 8. Percent of Dominant Species that are OBL. FACW or FAC (except FAC-). *-Dominant species. 1007a Cowardin Classification: PK ( u S 4 r.' a tvtt f r- n Remarks: -- uv"nnr ncv _ Recorded Data (Describe in Remarks): _ Stream, Lake, or Tide Gage _ Aerial Photograph _ Other No Recorded Data Available Field Observations: Depth of Surface Water: O (in.) Depth to Free Water in Pit: �6_ (in.) Depth to Saturated Soil: �i _ (in ) Remarks: Wetland Hydrology Indicators X Inundated Saturated in Upper 12 Inches Water Marks _ Water Lines _ Sediment Deposits _ Drainage Patterns in Wetlands Oxidized Root Channels in Upper 12 Inches _ Water -Stained Leaves Local Soil Survey Data Other (Explain in Remarks) Data Point: 3 of SOILS Map Unit Name: " a TP_ .IA`� S 1+C iv I0aLwl Drainage Class: Pyo r- 1., J roar ✓ J �T Field Observations Taxonomy (Subgroup): H L p la I u e pts Confirm Mapped Type? 19) No Profile Descriplion: Depth Matrix Color Mottle Colors Mottle Texture, Concretions, (inches) (MunselI Moist) (Munsell Moist) Rhizosnheres_ etc, o- y �.SY 3L-, �'_ 5i 1+ I r7 a.r►�t — y�8 D4R3 1 -- !la' oc;�'M Hvdnc Soil Indicators: _ Histosol _ Concretions _ Histic Epipedon _ High Organic Content in Surface Layer _ Sulfidic Odor _ Organic Streaking jL Probable Aquic Moisture Regime Listed on Local Hydric Soils List Reducing Conditions X Listed on National Hydric Soils List �C Gleyed or Low-Chroma Colors _ Other (Explain in Remarks) Remarks: h;, k D r q dkA, C S WETLAND DETERMINATION Hydrophytic Vegetation Present? Hydric Soils Present? Wetland HvdmloQv Present? Remarks: .-97'DAT-vFRMTRH4zh No ��-_ No Is this Data Point Within a Wetland? �) No No Data Point: of DATA FORM ROUTINE WETLAND DETERMINATION Proje&Site: J �.��<.� S W IyA St. Date: -�a0-117 Applicant/Owner: ►-P 10Arc 6 . City: B e n_or_ Investigator: T- R N Job #; N -10 0 6 - o l County: k�_ Have vegetation, soils, or hydrology been disturbed. Yes No State. WIA Is the area a potential Problem Area: Yes If needed, explain on reverse.) VEGETATION Dominant Plant Species Stm= % Cover jndicato Dminant Plant Species Stratum % Coy 1 indicator I. C,4i;S►4S _'3 0 AJ 17 1. 2. P4slo►r,s wrynd, H —_ Q FffCtJ 2. 3. D1;S Ftie. tl 3. 4. 4. 5. 5. 6. 6. 7. 7. 8. 8. Percent of Dominant Species that are OBL, FACW or FAC (exceptFAC- . *-Dominant es. 3 Cowardin Classification: 0. Remarks:-•.2020 Co,'er Of srtcSS S�tc%cS HYDROLOGY Recorded Data (Describe in Remarks): _ Stream, Lake, or Tide Gage _ Aerial Photograph _ Other No Recorded Data Available Field Observations: N o TV, Depth of Surface Water: (in.) Depth to Free Water in Pit: (in.) Depth to Saturated Soil: (in.) Remarks: Wetland Hydrology Indicators P dA j Inundated Saturated in Upper 12 Inches Water Marks Water Lines Sediment Deposits Drainage Patterns in Wetlands Oxidized Root Channels in Upper 12 Inches Water -Stained Leaves Local Soil Survey Data Other (Explain in Remarks) Data Point i of SOILS Map Unit Name: F, Drainage Class: +�� Field Observations Taxonomy (Subgroup): Confirm Mapped Type? Y No Profile Deriotion: Depth Matrix Color Mottle Colors Mottle Texture, Concretions, (inches) (Mansell Moist) (Mansell Moist) Rhizosgheres_ etc. 0 -20 ail R 413 �— 3ra�rel(� send„ i oam Hydric Soil Indicators: 1J 0 AA— _ Histosol _ Concretions Histic Epipedon _ High Organic Content in Surface Layer Sulfidic Odor _ Organic Streaking Probable Aquic Moisture Regime _ Listed on Local Hydric Soils List — Reducing Conditions _ Listed on National Hydric Soils List _ Gleyed or Low-Chroma Colors _ Other (Explain in Remarks) Remarks: WF.TI.ANn nFTFRMMATION Hydrophytic Vegetation Present? Hydric Soils Present? Wetland Hvdrologv Present? Remarks: 2-9TDATAFRM'rRH-uh No Yes � Is this Data Point Within a Wetland? Yes Yes APPENDIX C MODIFIED REPPERT WETLAND VALUES EVALUATION SHEET H-1006-01 APPENDIX C MODIFIED REPPERT WETLAND VALUES EVALUATION Values Basis For Evaluation 1. Natural Biologic Function High A. Food Chain Support Moderate i. Net Primary Production high Marsh vegetation it. Mode of Transport low Isolated remnant of a former wetland iii. Food Chain Support moderate Moderate diversity of vertebrate animals B. General Habitat High Diverse plant communities, SS, EM, FO C. Special Habitat High Downed logs, snags, and low banks with cover 2. Aquatic Study Areas, Sanctuaries, Refuge Moderate Education facilities in the local area 3. Hydrologic Support Function Moderate A. Hydrologic Periodicity Low Isolated wetland remnant B. Elevation in Basin Moderate Flooded infrequently 4. Shoreline Protection N/A No shoreline 5. Storage of Storm and Flood Water High A. Flood Storage Factor High Total wetland is > 10 acres in size B. Flood Retardation Factor High > 30% of wetland vegetative cover is woody trees and shrubs 6. Natural Groundwater Recharge High Total wetland is > 10 acre in size with an open water component 7. Water Purification High A. Wetland Type Moderate i. Hydroperiod low Intermittently flooded system, not associated with a lake, river or estuary C -1 H-1006-01 ii. Vegetative Density moderate Wetland vegetative cover is > 801'/0 B. Areal & Waste Loading High Relationship i. Total Wetland moderate Total wetland is > 10 acres in size ii. Proportion of Water to high 40-60% of wetland is covered with Wetland water iii. Proportion of Runoff high >50% of surface water runoff is retained Retained in Wetland in the wetland for no more than a 2 year event C. Location Factor High i. Frost -free Days high >250 days ii. Location Related to moderate Wetland adjacent to non -point sources; Pollution Sources roads, surface water ponds S. Cultural Values (Economics, High Remnant wetland of a historically larger Aesthetics, Recreational, system Archeological Sites. C -2 H-1006-01 WETLANDS EXHIBIT t S 18TH STREET a FLAGGED WETLAND 4 LIUIIS y■ IN • � I u I 8 0 Cn a.ur a � } SCALE 1• 40' �, I ' d m ` 1) , }o Po: n+s (Added 61 N KC) I = D V LU t Z a /) a z C Z J NOTE: I ¢ I j LU ?� ' 2 THIS BOUNDARY WAS TAKEN FROM AN UNRECORDED I— ., . I SURVEY AND SUPPLEMENTED WITH INFORMATION I TAKEN FROM ASSESSOR'S MAP. FULL BOUNDARY RESEARCH SHOULD BE DONE PRIOR TO THE START C tL OF ANY DESIGN / PLANNING FUNCTIONS. a a I •r I I _ LDarSI•' • 3. s • 4 Y {.Zj • � � Zj 15 I East Valley Road and SW 19`h Street Project N a ._ ' IRenton Washington m Y N u A - r SITE MAP ■ R , March 1997 H-1006-01 J4 �. Natural Resource Consulting FIG. 2 ;dbs i Assessment, Management and Regulatory Permitting F tI -