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HomeMy WebLinkAboutWetlandDelineationMemo_043021 W:\Projects\201016\Docs\Wetland Delineation\AnnieSubdivisionWetlandDelineationMemo_042621.docx MEMORANDUM DATE: April 30, 2021 TO: City of Bozeman Planning Department FROM: Sarah Howell, Staff Scientist 2 RE: Lot 1 Annie Subdivision Phase 3C Wetland Delineation Summary Bozeman, Montana S02, T2S, R5E WGM Group conducted a wetland and non-wetland waterway delineation at Lot 1 of Annie Subdivision Phase 3C on April 7th, 2021. This delineation was conducted in accordance with the 1987 U.S. Army Corps of Engineers Wetland Delineation Manual of the U.S. and the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys and Coast Region (Version 2.0). The delineation was performed to identify the presence and extent of wetlands on the property and to map wetland boundaries so required setbacks could be applied to the subdivision plans. The delineation limits encompass 3.24 acres and are located within the southwest ¼ of the southeast ¼ of Section 2, Township 2 South, Range 5 East, P.M.M. in Gallatin County, Montana. The property is located on the north side of Durston Road, just east of the intersection with North 25th Avenue in Bozeman (see Figure 1, Attachment A). One wetland (WL-1) was delineated during the April 7th, 2021 wetland delineation (see Figure 2, Attachment A). The topography of the property is generally flat with the exception of a 1- to 1.5-foot-deep swale running south to north on the eastern third of the property and the inset floodplain of the West Fork of Catron Creek. The western two thirds of the property have been landscaped with trees, shrubs and lawn while the eastern third appears more natural although disturbance is still evident. The swale is lined with ponderosa pine (Pinus ponderosa) on the western edge and yellow-twigged willow (Salix alba) on the eastern edge. A sample point (SP2U) was performed in the middle of this swale to document the lack of wetlands. Herbaceous vegetation included orchard grass (Dactylis glomerata), smooth brome (Bromus inermis), and common dandelion (Taraxacum officinale). The inset floodplain is about 12 to 15 feet wide on the west side of the West Fork of Catron Creek and about 6 feet wide on the east side. Topography drops 2 to 3 feet down to the floodplain and about another foot or so to the water surface in the stream. Vegetation within the floodplain is dominated by FAC species including Kentucky blue grass (Poa pratensis), common Timothy (Phleum pratense), and slender wild rye (Elymus trachycaulus). The soils were checked hydric soil indicators at several locations within the floodplain, but criteria were not met for hydric soils except for within a narrow wetland fringe along the stream. It is likely that the stream no longer accesses this floodplain regularly due to hydrologic changes resulting from development in the watershed. The West Fork of Catron Creek and its wetland fringe were delineated as WL-1. The portion of this wetland within the property is 0.07 acres. The channel is about 3 feet wide and 1 foot deep and enters the property near the southeast corner through two concrete culverts. The wetland fringe is 1-3 feet wide on each side. The stream runs along the eastern property boundary and leaves the property near the northeast property corner. Wetland hydrology is supported by surface water conveyed in the stream. Soils have a silt loam texture and are black at the surface to about 14 inches depth becoming very dark grayish brown below. Soils met the criteria for the loamy mucky mineral (F1) hydric soil indicator. Wetland hydrology indicators include primary indicators of surface water (A1) and saturation (A3) and the secondary indicatory of geomorphic position (D2). The National Wetland Inventory (NWI) classified this feature as palustrine, emergent, persistent, temporarily flooded, excavated (PEM1Ax). No other wetlands were mapped by NWI on the property. One pair of sample points were documented to support the location of the wetland boundaries. (see Attachment B – Wetland Determination Data Forms). Several additional soil pits were used to determine wetland boundaries but were not recorded. WL-1 is likely jurisdictional due to its connection to the East Gallatin River. ATTACHMENT A FIGURES ATTACHMENT B WETLAND DETERMINATION DATA FORMS Applicant/Owner:State: Investigator(s): Landform (hillside, terrace, etc.):3 Subregion (LRR): Lat: Soil Map Unit Name: x Are Vegetation , Soil , or Hydrology Are “Normal Circumstances” present? Yes x No Are Vegetation , Soil , or Hydrology SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. Yes X No Yes No X Yes X Yes No X ) 1. 2.(A) 3. 4.(B) Sapling/Shrub Stratum (A/B) 1. 2. 3. 4.x 1 = 5.x 2 = x 3 = x 4 = 1.x 5 = 2.Column Totals: (A) (B) 3. 4. 5. 6. 7.X 8. 9. 10. 11. Woody Vine Stratum 1. 2. Yes X Vegetation dominated by grasses. Percent of Dominant Species That Are OBL, FACW, or FAC: 20 Total Number of Dominant Species Across All Strata: Dominance Test worksheet: % Bare Ground in Herb Stratum Absolute % Cover 0 335 0 105 =Total Cover Elymus trachycaulus 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. (Plot size: =Total Cover No FACU Yes 5 foot radius NoAre climatic / hydrologic conditions on the site typical for this time of year? Project/Site: Lot 1 Annie Subdivision LRR E, MLRA 44 NWI classification: Dominant Species? 45.6863621870851 NAD83 Hydrophytic Vegetation Present? significantly disturbed? Sample point on floodplain about 6 feet from water's edge. WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Section 2, T2S R5E MT SP1U concave Section, Township, Range: Sampling Date: Sampling Point: Slope (%):Local relief (concave, convex, none): 4/7/21 Drew Russell/Russell Hosner Sarah Howell floodplain Bozeman/GallatinCity/County: Datum:-111.067357064657 510B - Meadowcreek loam, 0 to 4 percent slopes PEM1Ax Long: UPL species FACW species 100.0% ) 15 foot radius ) 75 Prevalence Index worksheet: 255 00 0 Total % Cover of: =Total Cover 1 - Rapid Test for Hydrophytic Vegetation 80 Multiply by: 0 Prevalence Index = B/A = 85 3 - Prevalence Index is ≤3.01 Hydrophytic Vegetation Indicators: Schedonorus pratensis FAC FAC Herb Stratum 20 No Poa pratensis 10 Problematic Hydrophytic Vegetation1 (Explain) 0 5 - Wetland Non-Vacular Plants1 4 - Morphological Adaptations1(Provide supporting =Total Cover ) Hydrophytic Vegetation Present? No data in Remarks or on a separate sheet) (Plot size: (Plot size: Remarks: FACU species FAC species OBL species 3.19 2 - Dominance Test is >50% Indicator Status 1 1 VEGETATION – Use scientific names of plants. (If no, explain in Remarks.) Hydric Soil Present? Wetland Hydrology Present? 30 foot radius naturally problematic? (If needed, explain any answers in Remarks.) (Plot size: Yes Number of Dominant Species That Are OBL, FACW, or FAC: Tree Stratum Is the Sampled Area within a Wetland? No 105 Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 Sampling Point: % %Type1 Loc2 99 1 C M Type: Depth (inches):Hydric Soil Present? Yes No X Primary Indicators (minimum of one is required; check all that apply) x Surface Water Present? Yes x Water Table Present? Yes x Saturation Present? Yes x Wetland Hydrology Present? Yes No X High Water Table (A2) MLRA 1, 2, 4A, and 4B) 4A, and 4B) 2Location: PL=Pore Lining, M=Matrix. Restrictive Layer (if observed): 2 cm Muck (A10) Red Parent Material (F21) Very Shallow Dark Surface (F22) Other (Explain in Remarks) Histosol (A1) Histic Epipedon (A2) Black Histic (A3) Hydrogen Sulfide (A4) Depleted Below Dark Surface (A11) Thick Dark Surface (A12) Sandy Mucky Mineral (S1) 2.5 cm Mucky Peat or Peat (S2) (LRR G) Sandy Redox (S5) Stripped Matrix (S6) Loamy Mucky Mineral (F1) (except MLRA 1) Loamy Gleyed Matrix (F2) Depleted Matrix (F3) 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Field Observations: (includes capillary fringe) Soils only moist. No No No Depth (inches): Depth (inches): Depth (inches): Redox Dark Surface (F6) Depleted Dark Surface (F7) Redox Depressions (F8) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic.Sandy Gleyed Matrix (S4) Surface Water (A1) 10YR 3/1 Matrix Texture 9-18 Redox FeaturesDepth (inches) Color (moist) 10YR 3/1 10YR 2/1 Color (moist) 10YR 3/6 0-6 Sparsely Vegetated Concave Surface (B8) Geomorphic Position (D2) Raised Ant Mounds (D6) (LRR A)Surface Soil Cracks (B6) Sediment Deposits (B2) Drift Deposits (B3) Water Marks (B1) Algal Mat or Crust (B4) Wetland Hydrology Indicators: Salt Crust (B11) Water-Stained Leaves (B9) (MLRA 1, 2 Frost-Heave Hummocks (D7)Other (Explain in Remarks) FAC-Neutral Test (D5)Recent Iron Reduction in Tilled Soils (C6) Stunted or Stressed Plants (D1) (LRR A) Inundation Visible on Aerial Imagery (B7) Iron Deposits (B5) Saturation (A3) Secondary Indicators (2 or more required) Shallow Aquitard (D3) Drainage Patterns (B10) Dry-Season Water Table (C2) Saturation Visible on Aerial Imagery (C9) Aquatic Invertebrates (B13) Hydrogen Sulfide Odor (C1) Oxidized Rhizospheres on Living Roots (C3) Water-Stained Leaves (B9) (except Presence of Reduced Iron (C4) Remarks: HYDROLOGY Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils 3: This data form is revised from Western Mountains, Valleys, and Coast Regional Supplement Version 2.0 to include the NRCS Field Indicators of Hydric Soils, Version 8.0, 2016. Few redox concentrations below 9 inches depth are prominent, but do not meet other criteria for redox dark surface hydric soil indicator. Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) 6-9 SP1USOIL silt loam cobbly sandy loam cobbly sandy loam Remarks US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 Applicant/Owner:State: Investigator(s): Landform (hillside, terrace, etc.):3 Subregion (LRR): Lat: Soil Map Unit Name: x Are Vegetation , Soil , or Hydrology Are “Normal Circumstances” present? Yes x No Are Vegetation , Soil , or Hydrology SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. Yes X No Yes X No Yes X Yes X No ) 1. 2.(A) 3. 4.(B) Sapling/Shrub Stratum (A/B) 1. 2. 3. 4.x 1 = 5.x 2 = x 3 = x 4 = 1.x 5 = 2.Column Totals: (A) (B) 3. 4. 5. 6. 7. 8.X 9. 10. 11. Woody Vine Stratum 1. 2. Yes X Bare ground percent represents area covered by water/stream. Percent of Dominant Species That Are OBL, FACW, or FAC: 20 Total Number of Dominant Species Across All Strata: Dominance Test worksheet: % Bare Ground in Herb Stratum Absolute % Cover 0 306 0 102 =Total Cover No FAC Poa pratensis Phleum pratense Schedonorus pratensis 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. (Plot size: =Total Cover 10 2 Yes FACW Yes 5 foot radius NoAre climatic / hydrologic conditions on the site typical for this time of year? Project/Site: Lot 1 Annie Subdivision LRR E, MLRA 44 NWI classification: Dominant Species? 45.6864025962663 NAD83 Hydrophytic Vegetation Present? significantly disturbed? Sample point on floodplain about 2 feet from water's edge. WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Section 2, T2S R5E MT SP1W concave Section, Township, Range: Sampling Date: Sampling Point: Slope (%):Local relief (concave, convex, none): 4/7/21 Drew Russell/Russell Hosner Sarah Howell floodplain Bozeman/GallatinCity/County: Datum:-111.067326870209 510B - Meadowcreek loam, 0 to 4 percent slopes PEM1Ax Long: UPL species FACW species 50.0% ) 15 foot radius ) 40 Prevalence Index worksheet: 186 00 20 Total % Cover of: =Total Cover 1 - Rapid Test for Hydrophytic Vegetation 80 Multiply by: 40 Prevalence Index = B/A = 62 3 - Prevalence Index is ≤3.01 FAC Hydrophytic Vegetation Indicators: No Phalaris arundinacea No FACU FAC Herb Stratum 15 No Solanum dulcamara Salix alba FACW 20 Problematic Hydrophytic Vegetation1 (Explain) 20 5 - Wetland Non-Vacular Plants1 4 - Morphological Adaptations1(Provide supporting =Total Cover ) Hydrophytic Vegetation Present? No data in Remarks or on a separate sheet) (Plot size: Cirsium arvense (Plot size: Remarks: FACU species FAC species OBL species FAC 3.00 5 2 - Dominance Test is >50% Indicator Status 1 2 VEGETATION – Use scientific names of plants. (If no, explain in Remarks.) Hydric Soil Present? Wetland Hydrology Present? 30 foot radius naturally problematic? (If needed, explain any answers in Remarks.) (Plot size: Yes Number of Dominant Species That Are OBL, FACW, or FAC: Tree Stratum Is the Sampled Area within a Wetland? No 102 10 No Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 Sampling Point: % %Type1 Loc2 100 100 x Type: Depth (inches):Hydric Soil Present? Yes X No Primary Indicators (minimum of one is required; check all that apply) X x x Surface Water Present? Yes x Water Table Present? Yes x Saturation Present? Yes x Wetland Hydrology Present? Yes X No High Water Table (A2) MLRA 1, 2, 4A, and 4B) 4A, and 4B) 2Location: PL=Pore Lining, M=Matrix. Restrictive Layer (if observed): 2 cm Muck (A10) Red Parent Material (F21) Very Shallow Dark Surface (F22) Other (Explain in Remarks) Histosol (A1) Histic Epipedon (A2) Black Histic (A3) Hydrogen Sulfide (A4) Depleted Below Dark Surface (A11) Thick Dark Surface (A12) Sandy Mucky Mineral (S1) 2.5 cm Mucky Peat or Peat (S2) (LRR G) Sandy Redox (S5) Stripped Matrix (S6) Loamy Mucky Mineral (F1) (except MLRA 1) Loamy Gleyed Matrix (F2) Depleted Matrix (F3) 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: 8 10 Field Observations: (includes capillary fringe) Soils saturated below 10 inches depth. Surface water in stream 2 feet away, approximately 8 inches deep. No No No Depth (inches): Depth (inches): Depth (inches): Redox Dark Surface (F6) Depleted Dark Surface (F7) Redox Depressions (F8) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic.Sandy Gleyed Matrix (S4) Surface Water (A1) Matrix Texture Redox FeaturesDepth (inches) Color (moist) 10YR 3/2 10YR 2/1 Color (moist) 0-14 Sparsely Vegetated Concave Surface (B8) Geomorphic Position (D2) Raised Ant Mounds (D6) (LRR A)Surface Soil Cracks (B6) Sediment Deposits (B2) Drift Deposits (B3) Water Marks (B1) Algal Mat or Crust (B4) Wetland Hydrology Indicators: Salt Crust (B11) Water-Stained Leaves (B9) (MLRA 1, 2 Frost-Heave Hummocks (D7)Other (Explain in Remarks) FAC-Neutral Test (D5)Recent Iron Reduction in Tilled Soils (C6) Stunted or Stressed Plants (D1) (LRR A) Inundation Visible on Aerial Imagery (B7) Iron Deposits (B5) Saturation (A3) Secondary Indicators (2 or more required) Shallow Aquitard (D3) Drainage Patterns (B10) Dry-Season Water Table (C2) Saturation Visible on Aerial Imagery (C9) Aquatic Invertebrates (B13) Hydrogen Sulfide Odor (C1) Oxidized Rhizospheres on Living Roots (C3) Water-Stained Leaves (B9) (except Presence of Reduced Iron (C4) Remarks: HYDROLOGY Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils 3: This data form is revised from Western Mountains, Valleys, and Coast Regional Supplement Version 2.0 to include the NRCS Field Indicators of Hydric Soils, Version 8.0, 2016. Soils feel greasy to 14 inches depth. Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) 14-18 SP1WSOIL mucky silt loam silt loam Remarks US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 Applicant/Owner:State: Investigator(s): Landform (hillside, terrace, etc.):1-2 Subregion (LRR): Lat: Soil Map Unit Name: x Are Vegetation , Soil , or Hydrology Are “Normal Circumstances” present? Yes x No Are Vegetation , Soil , or Hydrology SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. Yes No X Yes No X Yes X Yes No X ) 1. 2.(A) 3. 4.(B) Sapling/Shrub Stratum (A/B) 1. 2. 3. 4.x 1 = 5.x 2 = x 3 = x 4 = 1.x 5 = 2.Column Totals: (A) (B) 3. 4. 5. 6. 7. 8. 9. 10. 11. Woody Vine Stratum 1. 2. Yes X Bare ground is covered by litter. Percent of Dominant Species That Are OBL, FACW, or FAC: 55 Total Number of Dominant Species Across All Strata: Dominance Test worksheet: % Bare Ground in Herb Stratum Absolute % Cover 100 394 20 103 =Total Cover Schedonorus pratensis Taraxacum officinale Poa pratensis 1Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic. (Plot size: Pinus ponderosa Salix alba Populus deltoides Yes =Total Cover 15 Yes FACU Yes 5 foot radius NoAre climatic / hydrologic conditions on the site typical for this time of year? Project/Site: Lot 1 Annie Subdivision LRR E, MLRA 44 NWI classification: Dominant Species? 23 10 10 3 FACU 45.6862141829722 NAD83 Hydrophytic Vegetation Present? significantly disturbed? Sample point in the bottom of a swale running N-S across the property. WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Section 2, T2S R5E MT SP2U concave Section, Township, Range: Sampling Date: Sampling Point: Slope (%):Local relief (concave, convex, none): 4/7/21 Drew Russell/Russell Hosner Sarah Howell swale Bozeman/GallatinCity/County: Datum:-111.067803682638 457A - Turner loam, moderately wet, 0 to 2 percent slopes Upland Long: FAC UPL species FACW species 33.3% ) 15 foot radius ) 20 Prevalence Index worksheet: 54 00 10 Total % Cover of: =Total Cover 1 - Rapid Test for Hydrophytic Vegetation 220 Multiply by: 20 Prevalence Index = B/A = 18 3 - Prevalence Index is ≤3.01 FACU Hydrophytic Vegetation Indicators: Dactylis glomerata Yes FAC UPL Herb Stratum 20 Yes Bromus inermis 15 Problematic Hydrophytic Vegetation1 (Explain) 25 5 - Wetland Non-Vacular Plants1 4 - Morphological Adaptations1(Provide supporting =Total Cover ) Hydrophytic Vegetation Present? No data in Remarks or on a separate sheet) (Plot size: (Plot size: Remarks: FACU species FAC species OBL species FACU 3.83 2 - Dominance Test is >50% Indicator Status 2 6 VEGETATION – Use scientific names of plants. (If no, explain in Remarks.) Hydric Soil Present? Wetland Hydrology Present? 30 foot radius No naturally problematic? (If needed, explain any answers in Remarks.) (Plot size: Yes Number of Dominant Species That Are OBL, FACW, or FAC:FACW Tree Stratum Is the Sampled Area within a Wetland? No Yes 80 10 No Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0 Sampling Point: % %Type1 Loc2 100 100 100 Type: Depth (inches):Hydric Soil Present? Yes No X Primary Indicators (minimum of one is required; check all that apply) x Surface Water Present? Yes x Water Table Present? Yes x Saturation Present? Yes x Wetland Hydrology Present? Yes No X High Water Table (A2) MLRA 1, 2, 4A, and 4B) 4A, and 4B) 2Location: PL=Pore Lining, M=Matrix. Restrictive Layer (if observed): 2 cm Muck (A10) Red Parent Material (F21) Very Shallow Dark Surface (F22) Other (Explain in Remarks) Histosol (A1) Histic Epipedon (A2) Black Histic (A3) Hydrogen Sulfide (A4) Depleted Below Dark Surface (A11) Thick Dark Surface (A12) Sandy Mucky Mineral (S1) 2.5 cm Mucky Peat or Peat (S2) (LRR G) Sandy Redox (S5) Stripped Matrix (S6) Loamy Mucky Mineral (F1) (except MLRA 1) Loamy Gleyed Matrix (F2) Depleted Matrix (F3) 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Field Observations: (includes capillary fringe) Soils only moist. No No No Depth (inches): Depth (inches): Depth (inches): Redox Dark Surface (F6) Depleted Dark Surface (F7) Redox Depressions (F8) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic.Sandy Gleyed Matrix (S4) Surface Water (A1) 10YR 3/2 Matrix Texture 6-18 Redox FeaturesDepth (inches) Color (moist) 10YR 3/2 10YR 2/1 Color (moist) 0-3 Sparsely Vegetated Concave Surface (B8) Geomorphic Position (D2) Raised Ant Mounds (D6) (LRR A)Surface Soil Cracks (B6) Sediment Deposits (B2) Drift Deposits (B3) Water Marks (B1) Algal Mat or Crust (B4) Wetland Hydrology Indicators: Salt Crust (B11) Water-Stained Leaves (B9) (MLRA 1, 2 Frost-Heave Hummocks (D7)Other (Explain in Remarks) FAC-Neutral Test (D5)Recent Iron Reduction in Tilled Soils (C6) Stunted or Stressed Plants (D1) (LRR A) Inundation Visible on Aerial Imagery (B7) Iron Deposits (B5) Saturation (A3) Secondary Indicators (2 or more required) Shallow Aquitard (D3) Drainage Patterns (B10) Dry-Season Water Table (C2) Saturation Visible on Aerial Imagery (C9) Aquatic Invertebrates (B13) Hydrogen Sulfide Odor (C1) Oxidized Rhizospheres on Living Roots (C3) Water-Stained Leaves (B9) (except Presence of Reduced Iron (C4) Remarks: HYDROLOGY Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils 3: This data form is revised from Western Mountains, Valleys, and Coast Regional Supplement Version 2.0 to include the NRCS Field Indicators of Hydric Soils, Version 8.0, 2016. Lots of mycelium in the 3-6 inch layer. Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) 3-6 SP2USOIL loam clay loam cobbly clay loam Remarks US Army Corps of Engineers Western Mountains, Valleys, and Coast – Version 2.0