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Pocket Guide to Hydric Soils for Wetland Delineations In The Buzzards Bay National Estuary Program Buzzards Bay National Estuary Program 2870 Cranberry Highway East Wareham, MA 02538 Pocket Guide to Hydric Soils #508-291-3625 x 14 www.buzzardsbay.org for Wetland Delineations in Massachusetts Version 2.1 The Buzzards Bay National Estuary Program November, 2014 This document is a compilation of material taken from Delineating Bordering Vegetated Appendix G – Observing and Recording Hue, Value and Chroma Wetlands under the Wetlands Protection Act, published by the Massachusetts Department of Environmental Protection, Division of Wetlands, and Waterways and the Regional All colors noted in this Booklet refer to moist Munsell® colors (Gretag/Macbeth 2000). Do not attempt to determine colors while wearing sunglasses or tinted lenses. Colors must be determined Supplement to the Corps of Engineers Wetland Delineation Manual: Northcentral and under natural light and not under artificial light. Northeast Region (Version 2.0), published by the U.S. Army Engineer Research and Development Center. Chroma Soil colors specified in the ACOE indicators do not have decimal points (except for indicator A12); This document also includes excerpts from the Field Indicators of Hydric Soils in the however, intermediate colors do occur between Munsell chips. Soil color should not be rounded to United States, A Guide for Identifying and Delineation Hydric Soils, Version 7.0, qualify as meeting an indicator. For example, a soil matrix with a chroma between 2 and 3 should including the 2013 Errata, as well as Field Indicators for Identifying Hydric Soils in New be recorded as having a chroma of 2+. This soil material does not have a chroma of 2 and would England, 3rd ed. not meet any indicator that requires a chroma of 2 or less. Hue and Value This document is meant to be a companion to “The Buzzards Bay National Estuary Hue and value should be rounded to the nearest color chip when using the indicators. For example, Program Pocket Guide to Delineating Wetlands,” available at the Buzzards Bay National if the color is in between value of 3 and 4 it should be rounded and not excluded from meeting Estuary Program website, www.buzzardsbay.org. either Depleted Matrix, ACOE F3 or Redox Dark Surface, ACOE F6 because it is in between values. If the value is closer to a 3 then F6 or some other dark surface indicator should be Special thanks to Peter Fletcher for tips regarding the arrangement of the booklet. considered and if it is closer to 4 then F3 or some other depleted matrix indicator should be considered. Timing - not too wet, and not too dry Always examine soil matrix colors in the field immediately after sampling. Ferrous iron, if present, can oxidize rapidly and create colors of higher chroma or redder hue. In soils that are saturated at the time of sampling, redox concentrations may be absent or difficult to see, particularly in darkcolored soils. It may be necessary to let the soil dry to a moist state (5 to30 minutes or more) for the iron or manganese to oxidize and redox features to become visible. Postscipt: Indicators of Hydrology Primary Indicators (minimum of one required) Surface Water Water-Stained Leaves High Water Table Aquatic Fauna Saturation Oxidized Rhizospheres on Living Roots Hydrogen Sulfide Odor Sediment Deposits Water Marks Drift Deposits Presence of Reduced Iron Algal Mat or Crust Recent Iron Reduction in Tilled Soils Iron Deposits Thin Muck Surface Inundation Visible on Aerial Imagery Sparsely Vegetated Concave Surface Secondary Indicators (minimum of two required) Surface Soil Cracks Drainage Patterns Unless otherwise noted, photos are from the Regional Supplement to the Corps of Moss Trim Lines Dry-Season Water Table Engineers Wetland Delineation Manual: Northcentral and Northeast Region (Version Crayfish Burrows Saturation Visible on Aerial Imagery 2.0). Stunted or Stressed Plants Geomorphic Position Shallow Aquitard Microtopographic Relief FAC-Neutral Test Cover photo: Soil samples from Carver. Wettest from right to left. These are disturbed, sandy spodosols (evergreen forest soils). Notice the redoximorphic features in all BBNEP Note: For details on these hydrology indicators, see the DEP Delineation Manual samples. Photo credit: John Rockwell. and the Regional Supplement. 67 Appendix F: ACOE Memo regarding use of “Field Indicators for Identifying Hydric Soils in New England, Version 3 Table of Contents Preface ................................................................................. i 1. All Soils Histosols ……….............................................................. 1 Histic Epipedon ............................................................... 3 Sulfidic Materials ............................................................. 4 Gleyed Matrix .................................................................. 5 Depleted Matrix................................................................ 7 Redox Depletions ............................................................13 Chroma 3 with Very Dark Surface ………………………. 17 2. Sandy Soils ................................................................... 18 Sandy Mucky Mineral ……............................................. 19 Stripped Matrix .............................................................. 20 Dark Surface ……………............................................... 21 Thin Dark Surface ......................................................... 22 Sandy with Redox & Thick, Very Dark Surface ………... 23 5cm Mucky Peat or Peat ………………………………... 24 3. Soils with evidence of Spodic Development ……...... 25 Stripped Matrix ............................................................... 27 Polyvalue below Surface ................................................ 28 Thin Dark Surface .......................................................... 29 Mesic Spodic ................................................................. 30 Other Spodosols ………………………………………….. 31 4. Unique or Specialized Indicators of Hydric Soils. Floodplain Soils ………………………….......................... 36 A-Horizons that are Thick and Very Dark ....................... 41 Soil from Highly Colored Parent Material ....................... 48 Redox Depressions ....................................................... 55 2cm Muck ...................................................................... 56 66 Appendix E: Redox Features- Faint vs. Distinct Coast Prairie Redox ........................................................57 Very Shallow Dark Surface ............................................ 58 Compare the matrix color to the redox feature color. The contrast is distinct if: (Note: Regardless of the magnitude of hue difference, where both colors have value <3 and chroma <2, the contrast is faint.) 5. Areas Where the Hydrology has been Recently Altered …….……………………………………………… 59 Threshold for Distinct Δ Hue Δ Value Δ Chroma Appendices 0 <2 >1 to <4 Appendix A - MLRA Boundaries …………………………… 60 0 >2 to <4 <4 Appendix B - Thickness Criteria For Particularly 1 <1 >1 to <3 Difficult Soils …………………………….…… 61 1 >1 to <3 <3 Appendix C - Spodosol Field Criteria ……………………... 63 2 0 >0 to <2 Appendix D - Mucky Mineral Field Identification 2 >0 to <2 <2 For Particularly Difficult Soils …………….…. 64 Appendix E - Redox Features- Faint vs. Distinct ……….… 65 Conversely, faint is evident only on close examination. The contrast is faint if: Appendix F - ACOE Memo regarding use of “Field Indicators for Identifying Hydric Soils in New England, Version 3” …………………… 66 Upper Threshold for Faint Appendix G – Observing and Recording Hue, Value Δ Hue Δ Δ Chroma and Chroma …………………………………... 67 Value 0 ≤2 ≤1 Postscript: Indicators of Hydrology ……………………….... 67 1 ≤1 ≤1 2 0 0 Hue Value Chroma Any ≤3 ≤2 Any feature above the upper threshold for faint features would be considered either distinct or prominent. If an indicator requires distinct or prominent features then those features at or below the faint threshold do not count. 65 Preface Appendix D: Mucky Mineral Field Identification for ACOE Indicators - Determining the texture of soil materials high in organic carbon. Introduction Material high in organic carbon could fall into three categories: organic, mucky mineral, or mineral. In lieu of laboratory data, the following estimation method can be used for Since 1995, the use of Hydric Soils has been an important part of the delineation process soil material that is wet or nearly saturated with water. This method may be inconclusive in wetland delineation pursuant to the M.G.L. Chapter 131, section 40, the Massachusetts with loamy or clayey textured mineral soils. Gently rub the wet soil material between Wetlands Protection Act. forefinger and thumb. If upon the first or second rub the material feels gritty, it is mineral soil material. If after the second rub the material feels greasy, it is either mucky mineral Hydric Soils are considered a confirmation of wetland hydrology as called for in the or organic soil material. Gently rub the material two or three more times. If after these regulatory definition of a bordering vegetated wetland, found in 310 CMR 10.55 (2)(c)., additional rubs it feels gritty or plastic, it is mucky mineral soil material; if it still feels greasy, it is organic soil material. and should be part of every wetland delineation. In disturbed sites, the presence of hydric soils is sufficient to determine that “there are indicators of saturated or inundated conditions sufficient to support a predominance of wetland indicator plants.” For areas that have been recently drained,
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