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HomeMy WebLinkAbout23IWC9-669Rte163 - Wetland Delineation report Wetland Delineation • Wetland Assessment & Permitting • Wildlife & Botanical Surveys • Fisheries & Aquatics • GIS Mapping Davison Environmental, LLC • 10 Maple Street, Chester, CT 06412 • 860-803-0938 • www.davisonenvironmental.com April 9, 2023 James Cerkanowicz, PE Verogy 124 LaSalle Road, 2nd Floor West Hartford, CT 06107 RE: Wetland and Watercourse Delineation Report Montville Landfill 669 CT-163, Montville, CT Mr. Cerkanowicz, At your request, I conducted an inspection on the above-referenced property on March 6, 2023 as depicted on the attached Wetland Delineation Sketch Map. The purpose of the inspection was to delineate Connecticut jurisdictional wetlands and watercourses. The inspection was conducted by a soil scientist according to the requirements of the Connecticut Inland Wetlands and Watercourses Act (P.A. 155). Inland wetlands include soil types designated as poorly drained, very poorly drained, alluvial, and floodplain by the National Cooperative Soils Survey as may be amended from time to time, of the National Resources Conservation Service (NRCS). Watercourses means rivers, streams, brooks, waterways, lakes, ponds, marshes, swamps, bogs and all other bodies of water, natural or artificial, vernal or intermittent. Intermittent watercourses shall be delineated by a defined permanent channel and bank and the occurrence of two or more of the following characteristics: (A) Evidence of scour or deposits of recent alluvium or detritus, (B) the presence of standing or flowing water for a duration longer than a particular storm incident, and (C) the presence of hydrophytic vegetation. Wetlands were delineated by examining the upper 20” of the soil profile with an auger. Those areas meeting the requirements noted above were marked with pink flagging tape labeled “Wetland Delineation” and numbered 1-15, 16-32, 1X-32X and 1Q-13Q. Refer to Wetland Delineation Sketch Map, attached (note that the sketch map is for illustrative purposes only). -2- Three wetlands were delineated. To the north of the capped landfill and transfer station storage yard there is a large, forested wetland bordering Fox Brook. It has a hydrology that is saturated throughout most of the wetland, with areas along the brook subject to overbank flow during flood events. To the southeast of the transfer station access road lies a forested wetland situated in a drainageway that drains east. This wetland is gently sloping with a saturated hydrology. The third delineated area consists of a channelized drainage ditch located west of the capped landfill. The ditch drains into a culvert at Oakdale Road. Wetland Soil Types Wetland soils are comprised of the Ridgebury, Leicester and Whitman complex, Aquents and the Pootatuck series. Ridgebury, Leicester and Whitman is an undifferentiated mapping unit consisting of two poorly drained (Ridgebury and Leicester) and one very poorly drained (Whitman) soil developed on glacial till in depressions and drainageways in uplands and valleys. Their use interpretations are very similar, and they typically are so intermingled on the landscape that separation is not practical. The Ridgebury and Leicester series have a seasonal high water table at or near the surface (0-6") from fall through spring. They differ in that the Leicester soil has a more friable compact layer or hardpan, while the Ridgebury soils have a dense to very dense compact layer. The Whitman soil has a high water table for much of the year and may frequently be ponded. The Pootatuck series consists of very deep, moderately well drained loamy soils formed in alluvial sediments. They are nearly level soils on floodplains subject to common flooding. Permeability is moderate or moderately rapid in the loamy upper horizons and rapid or very rapid in the sandy substratum layers. Disturbed wetland soils of anthropogenic origin are classified as Aquents. Aquents is a miscellaneous land type used to denote areas of anthropogenic origin or disturbance that are poorly drained or very poorly drained, and hydric. These soils have an aquic soil moisture regime and can be expected to support hydrophytic vegetation. Typically, these soils occur in places where less than two feet of earthen material have been placed over poorly or very poorly drained soils; areas where the natural soils have been mixed so that the natural soil layers are not identifiable; or where the soil materials have been excavated to the watertable. Upland (Non-Wetland) Soil Types The non-wetland soils were not examined in detail, except as was necessary to identify the -3- wetland boundary. They generally consist of Udorthents, and the Ninigret and Tisbury complex. Udorthents is a miscellaneous land type used to denote moderately well to excessively drained earthen material which has been so disturbed by cutting, filling, or grading that the original soil profile can no longer be discerned. The Ninigret series consists of very deep, moderately well drained soils formed in loamy over sandy and gravelly glacial outwash. They are nearly level to strongly sloping soils on glaciofluvial landforms, typically in slight depressions and broad drainageways. The soil has a seasonal high water table. The Tisbury series consists of very deep, moderately well drained loamy soils. They are nearly level and gently sloping soils on outwash plains and terraces, typically in slight depressions and broad drainageways. Permeability is moderate in the surface layer and subsoil and rapid or very rapid in the substratum. Tisbury soils are nearly level and gently sloping soils on terraces and outwash plains. The soils formed in a silty eolian deposits over stratified sandy and gravelly outwash materials derived from a variety of acid rocks. If you have any questions regarding these findings, please feel free to contact me. Respectfully submitted, Eric Davison Certified Professional Wetland Scientist Registered Soil Scientist eric@davisonenvironmental.com www.davisonenvironmental.com Attachments: (1) Wetland Photographs (2) Wetland Delineation Sketch Map WETLAND PHOTOGRAPHS ____________________________________________________________________________________ Photo 2: View of Fox Brook and bordering floodplain. Photo 1: View of forested wetland along edge of landfill near Fox Brook. Photo 4: View of drainage ditch wetland near Oakdale Road. Photo 3: View of eastern wetland near access road. -2- WETLAND DELINEATION SKETCH MAP ____________________________________________________________________________________ 1Q-13QCULVERTOUTLETFLAG 1XFLAG 32XFLAG 16FLAG 32FLAGS 32 AND32X CONNECTFLAG 1FLAG 15NON-WETLANDSTORMWATER OUTLETHERE (NOT FLAGGED)WETLANDSWETLANDSWETLANDS