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2017.10.26 Appendix D-2 - Wetland Delineation Memo Environmental, Planning, and Engineering Consultants 34 South Broadway Suite 401 White Plains, NY 10601 tel: 914 949-7336 fax: 914 949-7559 www.akrf.com New York City ● Hudson Valley Region ● Long Island ● Baltimore / Washington Area ● New Jersey ● Philadelphia Memorandum To: Peter Duncan, 900 King Street Owner LLC From: Sarah Bray, AKRF, Inc. Date: September 21, 2017 Re: 900 King St.- Rye Brook, NY- Wetland Delineation Report- V2 cc: Peter Feroe INTRODUCTION At your direction, AKRF, Inc. investigated the approximately 17.77 acre parcel at 900 King Street for the presence of wetlands and waterbodies. The investigation was performed in furtherance of the proposed redevelopment of the Site, which would include the demolition of the existing approximately 200,000 square foot office building, and the development of an integrated age-restricted residential community that includes approximately 24 townhouses, approximately 160 units of independent living, and approximately 85 units of assisted living. This memo describes AKRF’s investigation, including the methodology that was followed and the results of the investigation. METHODOLOGY Prior to the on-Site wetlands investigation, the New York State Department of Environmental Conservation (NYSDEC) and United States Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI) maps were reviewed by AKRF to determine locations of state-mapped or NWI-mapped wetlands on and in the vicinity of the Project Site. The Natural Resources Conservation Service (NRCS) soils maps were also reviewed to determine soil types within the Project Site, particularly with respect to soil series identified as hydric soils. After review of this material, as well as aerial photographs of the Project Site, an AKRF wetland scientist conducted a wetland delineation of the Site using the United States Army Corps of Engineers (USACE) and Village of Rye Brook wetland delineation methodology on April 28, 2017, May 12, 2017, May 22-24, 2017, and September 12, 2017.1 The methodology used to identify wetlands, including the three USACE wetland indicators (i.e., hydrology, soils, and hydrophytic 1 Environmental Laboratory. 1987. “Corps of Engineers Wetlands Delineation Manual,” Technical Report Y-87-1, US Army Engineer Waterways Experiment Station, Vicksburg, Miss; U.S. Army Corps of Engineers. 2011. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Northcentral and Northeast Region (version 2.0), ed. J.S. Wakeley, R.W. Lichvar, C.V. Noble, and J.F. Berkowitz. ERDC/EL TR-12-1. Vicksburg, MS: U.S. Army Engineer Research and Development Center.; Village of Rye Brook Code – Chapter 245: Wetlands and Watercourses. P. Duncan 2 September 21, 2017 vegetation), is described below. In accordance with that methodology, photographs were taken of observed wetland areas. HYDROLOGY AND SOILS The hydrology of the Site was characterized using aerial photographs, site observations, a sharp-shooter spade, and an auger to determine soil saturation and/or a high water table. Soils were characterized with the use of a spade and an auger and a Munsell Soil Color Chart. During the wetlands investigation, both hydrology and soil observations were made during periods of both wet and dry weather. VEGETATION The USACE Northcentral and Northeast 2014 Regional Wetland Plant List was used to determine the wetland/upland status of the vegetation identified on the Project Site. Percent cover was documented in the tree, vine, shrub, and herbaceous strata. A 30-foot (ft) radius plot was established to document percent cover of the tree and vine strata. Within this 30-ft plot, a 15-ft radius plot was established for the measurement of shrubs and saplings. For species in the herbaceous stratum, five 3.28-ft by 3.28-ft square plots were sampled within the 30-ft tree and vine plot and averaged together. EXISTING CONDITIONS MAPPING National Wetlands Inventory-Mapped Wetlands There are no NWI-mapped wetlands within the 900 King St. Site (see Figure 1). The closest mapped resource is the Byram River, approximately 0.5 miles away. New York State Department of Environmental Conservation-Mapped Wetlands There are no NYSDEC-mapped freshwater wetlands or streams within the 900 King St. Site (see Figure 2). The closest NYSDEC-mapped resource is a class C stream, mapped approximately 0.32 miles away. Natural Resources Conservation Service -Mapped Soils Within the 900 King Site, soils are mapped as “ChB,- Charlton fine sandy sandy loam, 3 to 8 percent slopes; PnB- Paxton fine sandy loam, 3 to 8 percent slopes; PnC- Paxton fine sandy loam, 8 to 15 percent slopes; Uf- Urban land; UhB- Urban land-Charlton complex, 2 to 8 percent slopes; UhC- Urban land- Charlton complex, 8 to 15 percent slopes; WdB- Woodbridge loam, 3 to 8 percent slopes. All soils mapped for the Site are described as moderately well drained to well drained, with the large majority made up of soils typical to largely disturbed Urban land. There are not any hydric soils mapped on the Project Site. On-Site soils are shown in Figure 3. ONSITE DELINEATION Wetland investigations and delineations were conducted on April 28, 2017, May 12, 2017, May 22-24, 2017, and September 12, 2017. Five locations were identified that meet the three parameter requirement for the presence of wetlands (hydric soil, hydrophytic vegetation, and hydrology) of the US Army Corps of Engineers Methodology. The soils, hydrology, and hydrophytic vegetation of the wetlands were documented by sampling points, and are described below. Wetland locations are included in Figure 4. Photos of each delineated area are included in Figure 5. Wetland A and Stream A Wetland A, flagged A1 to A35, is located at the western side of the Site. The central portion of the woodland area at the western side of the Site contains saturated soils, due to its lower position in the landscape as well as from the fact that it is surrounded by development. Wetland A is a forested wetland that begins upslope in the northern portion of the Site at a low spot, dominated by American sycamore (Platanus occidentalis) and poison ivy (Toxicodendron radicans). The wetland flows south with the descending contours through the woodland, opens out to an herbaceous section dominated by jewelweed P. Duncan 3 September 21, 2017 (Impatiens capensis) and sedges (Carex spp.), before it is channelized into a narrow stream, “Stream A,” which runs through lawn and is eventually conveyed to a culvert that crosses Arbor Drive. Primary hydrology indicators met include “A1 Surface Water” up to ½ in in depth, “A2 High Water Table”, located at 6 inches, “A3 Saturation” to the surface (0in), and “B3 Drift Deposits”; secondary indicators include “B16 Moss Trim Lines” and “D2 Geomorphic Position”. Soils of this wetland meet the criteria of “A3 Depleted Matrix” (See Data Form Wetland A-1). Wetland B Wetland B was flagged B1 to B7 and is located primarily off-Site to the north at the northwestern portion of the site. Wetland B is a common reed (Phragmites australis) dominated herbaceous wetland depression with a woodland fringe, located north of the existing on-Site parking lot. It is hydrologically supplied by runoff from a culvert passing under the Hutchinson River Parkway, which then outlets into a rock-lined depression to the north of the Project Site, within the right-of-way for the Hutchinson River Parkway. A rock dam is situated at the edge of the emergent/depressional area; however wetland soils, vegetation, and hydrology are evident beyond (south) of this barrier within the wooded area, which is dominated by silver maple (Acer saccharinum) and poison ivy. Thus the delineated wetland area includes both emergent and wooded areas. Primary hydrology indicators met include “A2 High Water Table,” located at 5in, “A3 Saturation” to the surface (0in), and “B9 Water Stained Leaves”. Secondary hydrology indicator D2 “Geomorphic position” is also met. Soils meet the criteria of “A3 Depleted Matrix” (See Data Form Wetland B-1). Wetland C Wetland C was flagged C1 to C7 and is located at the northern portion of the Site. Wetland C is a small forested (PFO) wetland situated to the north of the parking lot, east of Wetland B, in a flat area dominated by silver maple and green ash (Fraxinus pennsylvanica), poison ivy, and bishop’s goutweed (Aegopodium podagraria). The northern portion of Wetland C is located within the right-of-way of the Hutchinson River Parkway. Much of the forest floor is unvegetated and contains water-stained leaves, meeting primary hydrology indicators “B9 Water-Stained Leaves” and “B8- Sparsely Vegetated Concave Surface”. Other primary hydrology indicators met include “B3 Drift Deposits” and the secondary hydrology indicator of “D2 Geomorphic Position,” since the wetland is located at the toe of a slope. Run-off from the Hutchinson Parkway is likely the source of hydrology. Soils of this wetland meet the criteria of “A11 Depleted Below Dark Surface.” (See Data Form Wetland C-1) Wetland D and Stream S Wetland D was flagged D1 to D16 and is located at the eastern side of the Site. Likely created as a stormwater basin, this emergent wetland, dominated by common reed, is located to the east of the parking lot. Soils of this wetland meet the criteria of “A11 Depleted Below Dark Surface”. The primary hydrology indicators are “A1 Surface Water”, which was present up to a depth of 1 inch, “A3 Saturation”, which occurs at a depth of 5 inches, “C3 Oxidized Rhizospheres on Living Roots”, and secondary hydrology indicator of “D2 Geomorphic Position,” since the elevation of the wetland was in a depression compared to the surrounding area (see Data Form Wetland D-1). Two culvert inlets on the north side of the wetland convey water from off-Site (from the east) and on-Site from the parking lot. Three culvert outlets on the south side, including an overflow structure, discharge surface water from this wetland to “Stream S” delineated to the south, which flows through a short corridor dominated by American basswood (Tilia Americana) and tulip poplar (Liriodendron tulipifera). Wetland E Wetland E was flagged E1 to E6 and is located primarily off-Site to the northeast of the Project Site. Wetland E is a small, forested wetland in an area that demonstrates a high level of disturbance and fill. P. Duncan 4 September 21, 2017 Dominant vegetation in the canopy layer includes green ash and silver maple; tatarian honeysuckle (Lonicera tatarica) and European privet (Ligustrum vulgare) dominate the shrub layer; and, poison ivy dominates the herbaceous layer. Honeysuckle, though not listed as wetland species is noted in the Northcentral and Northeast 2014 Regional Wetland Plant List as a non-native, invasive species that can occur in wetlands. The primary hydrology indicator identified is “C3 Oxidized Rhizospheres on Living Roots”; secondary hydrology indicators are “B6 Surface Soil Cracks”, “B10 Drainage patterns”, and “D2 Geomorphic Position,” (see Data Form Wetland E). A drainage pipe that leads to an adjacent residential property appears to supply some of the hydrology. Upland The upland areas on-Site include herbaceous areas, forested areas, and paved areas. Herbaceous areas can be described as large areas of mowed lawn with ornamental trees. Forested areas consist of woodlands ranging from deciduous hardwood oak-maple located in the southeast corner of the property, to American basswood dominated forest located north of the parking lot. The vegetation, soils, and hydrology of these areas do not meet the USACE criteria for a wetland. For these reasons, these areas were documented as upland (see Data Forms A-2, B-2, C-2, and D-2). SUMMARY As described above, five freshwater wetlands were identified on and adjacent to the Project Site using the USACE and Village of Rye Brook wetland delineation methodology. The Village of Rye Brook regulates each of the on-Site wetlands and watercourses flagged by AKRF, subject to confirmation by the Village, and their associated 100-foot buffer, pursuant to Chapter 245, Wetlands and Watercourses, of the Village Code. Figures: 1. NWI Wetlands 2. NYSDEC Freshwater Wetlands 3. USDA Mapped Soils 4. Wetland Delineation Sketch 5. Representative Site Photographs Attachments: USACE Wetland Determination Forms 900 King St. Rye Brook, NY U.S. Fish and Wildlife Service, National Standards and Support Team,wetlands_team@fws.gov Wetlands Estuarine and Marine Deepwater Estuarine and Marine Wetland Freshwater Emergent Wetland Freshwater Forested/Shrub Wetland Freshwater Pond Lake Other Riverine June 16, 2017 0 0.1 0.20.05 mi 0 0.2 0.40.1 km 1:7,921 This page was produced by the NWI mapperNational Wetlands Inventory (NWI) This map is for general reference only. The US Fish and Wildlife Service is not responsible for the accuracy or currentness of the base data shown on this map. All wetlands related data should be used in accordance with the layer metadata found on the Wetlands Mapper web site. Environmental Resource Mapper + – 0 300 600 Soil Map—Westchester County, New York (900 King St., Rye Brook, NY) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 5/26/2017 Page 1 of 3 45 4 3 0 3 0 45 4 3 1 0 0 45 4 3 1 7 0 45 4 3 2 4 0 45 4 3 3 1 0 45 4 3 3 8 0 45 4 3 4 5 0 45 4 3 5 2 0 45 4 3 5 9 0 45 4 3 0 3 0 45 4 3 1 0 0 45 4 3 1 7 0 45 4 3 2 4 0 45 4 3 3 1 0 45 4 3 3 8 0 45 4 3 4 5 0 45 4 3 5 2 0 45 4 3 5 9 0 611120 611190 611260 611330 611400 611470 611540 611120 611190 611260 611330 611400 611470 611540 41° 2' 10'' N 73 ° 4 0 ' 4 2 ' ' W 41° 2' 10'' N 73 ° 4 0 ' 2 1 ' ' W 41° 1' 50'' N 73 ° 4 0 ' 4 2 ' ' W 41° 1' 50'' N 73 ° 4 0 ' 2 1 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 100 200 400 600 Feet 0 45 90 180 270 Meters Map Scale: 1:3,040 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. ARCHITECT: APPLICANT/OWNER: Drawing No:Project No:Date:Scale:Drawn: A p p r o v e d : ANY ALTERATION OF PLANS,SPECIFICATIONS, PLATS AND REPORTS BEARING THE SEAL OF A LICENSED PROFESSIONAL ENGINEER OR LICENSED LAND SURVEYOR IS A VIOLATION OF SECTION 7209 OF THE NEW YORK STATE EDUCATION LAW,EXCEPT AS PROVIDED FOR BY SECTION 7209, SUBSECTION 2.No. Revision DateBy C O P Y R I G H T © 2 0 1 7 b y J M C A l l R i g h t s R e s e r v e d . 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Photographs Figure 5 9.20.17 900 KING 2 Wetland A; facing north 1 Wetland A; facing south Photographs Figure 5 9.20.17 900 KING 4 3 Wetland B; facing north Wetland A and associated stream; facing southeast Photographs Figure 5 9.20.17 900 KING 6 Wetland B- woodland fringe; facing south 5 Wetland C; facing southwest Photographs Figure 5 9.20.17 900 KING Wetland D, culverts; facing east Wetland D; facing northwest 8 7 Photographs Figure 5 9.20.17 900 KING 9Stream, south of Wetland D; facing southeast Photographs Figure 5 9.20.17 900 KING Wetland E; facing south Wetland E; Mud Cracks SOIL Sampling Point: A -1AProfile o.,.scriptlon: (Describe to the depth needed to document the Indicator or confirm the absence of Indicators.) Depth Matrix (inches} Color (moist} ; .. � ) ) "' Ii'_, "l /1 1,. lo ,O'ff!-3/1 {() _, ,l 1r�12 1L, \1--w � loo'!" Redox Features Color (moist) � _IYQL Loc2 Texture Remarks ci u,""' _Jr .. ('lw, 51,). "r,IL. ---I ------------- ---C'_.. ,� (lr.t) __________ _ 1T : C=Concentralion, D=De lelion, RM=Reduced Matrix, MS=Masked Sand Grains.2Locatlon: PL=Pore linln , M=Matrix. Hydric Soll Indicators: _ Histosol (A1) _ Hislic Epipedon (A2) _ Black Histic (A3) _ Hydrogen Sulfide (A4) _ Stratified Layers (A5) _ Df.!pleted Below Dark Surface (A 11 ) _ Thick Dark Surface (A12) _ Sandy Mucky Mineral (S1) _ Sandy Gleyed Matrix (S4) _ Sandy Redox (S5) _ Stripped Matrix (S6) _ Polyvalue Below Surface (S8) (L�t{ R, MLRA1498) _ Thin Dark Surface (S9) (LRR R, MLRA 1498) _ Loamy Mucky Mineral (F1) (LRR K, L) _ Loamy Gleyed Matrix (F2) ---'-l}epleted Matrix (F3) _.YRedox Dark Surface (F6) _ Depleted Dark Surface (F7) _ Redox Depressions (F8) _ Dark Surface (S7) (LRR R, MLRA 1498) Indicators for Problematic Hydric Solls3: _ 2 cm Muck (A10)(LRR K, L, MLRA 1498) _ Coast Prairie Redox (A16) (LRR K, L, R) , ----+ 5 cm Mucky Peat or Peat (SJ) (LRR K, L, R) _ Dark Surface (S7) (LRR K, L, M) _ Polyvalue Below Surface (S8) (LRR K, L) ._ Thin Dark Surface (S9) (LRR K, L) _ Iron-Manganese Masses (F12) (LRR K, L, R) _ Piedmont Floodplain Soils (F19) (MLRA 1498) _ Mesic Spodic (TA6) (MLRA 144A, 145, 1498) _ Red Parent Material (F21) _ Very Shallow Dark Surface (TF12) _ Other (Explain in Remarks) 31ndicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic.Restrictive Layer (If observed): Type: __________ _ Depth (inches): _______ _ Hydric Soll Present? Yes / No Remarks: US Army Corps of Engineers Northcentral and Northeast Region -Version 2.0