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�acobson Environmental, PLLC www.jacobsonenvironmental.com Environmental Consultants Wayne 7acobson, P.S.S.,W.D.C., P.W.S., A.F.S. ------------------------------------------------------------------------------------------------------------ 5821 Humboldt Avenue North, Brooklyn Center, IMN 55430 (612) 802-6619 Cell Email: jacobsonenv@msn.com With the 50/20 rule, dominants are generally measured by absolute °/a cover in each stratum which individually or collectively account for more than 50% of total vegetative cover in the stratum, plus any other species which itself accounts for at least 20°/a of the total vegetative cover. Soils A hydric soil is a soil formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part. If a soil exhibits the indicators of a hydric soil or is identified as a hydric soil the hydric soil criterion is met. The break between hydric and non-hydric soils was determined by excavating soil pits along transects crossing the wetland/upland eco-tone and evaluating the soil colors, textures, and presence or absence of redoximorphic indicators (i.e., mottles, gley or oxidized rhizospheres). Hydric Soil Indicators for the Midwest Region were noted as presented in the National Technical Committee for Hydric Soils Field Indicators of Hydric Soi/s in the United States version 7.0(USDA NRCS 2010) if present at each sample point. Also, upper soil profiles were compared to the mapped or inclusionary soil series found in the sample area for soil identification purposes. Cautions used in applvinq the Field Indicators of Hvdric Soils There are hydric soils with morphologies that are difficult to interpret. These include soils with black, gray, or red parent material; soils with high pH; soils high or low in content of organic matter; recently developed hydric soils, and soils high in iron inputs. In some cases we do not currently have indicators to assist in the identification of hydric soils in these situatinns. As long as the soil meets the definition of a hydric soil, the lack of an indicator does not preclude tha soil from being hydric. The indicators were developed mostly to identify the boundary of hydric soil areas and generally work best on the margins. Not all of the obviously wetter hydric soils will be identified by the indicators. Redoximorphic features are most likely to occur in soils that cycle between anaerobic (reduced) and aerobic(oxidized) conditions. Morphological features of hydric soils indicate that saturation and anaerobic conditions have existed under either contemporary or former hydrologic regimes. Where soil morphology seems inconsistent with the landscape, vegetation, or observable hydrology, it may be necessary to obtain the assistance of an experienced soil or wetland scientist to determine whether the soil is hydric. To clarify on some Hennepin County sites, 1. Many of these soils have black or gray parent materials 2. Many of the soils have a high organic matter content 3. The hydric soil margin is typically higher than the wetland boundary margin on the site 4. Not all of the obviously wetter soils will be identified by the indicators 5. Many of the hydric soils are Mollisols which are classic problem hydric soils in many cases Hvdroloqv The presence of current wetland hydrology was determ�ned through direct observation of free water in the excavated soil pit, saturated soil conditions or soil redo>:imorphic features. However, the effect of on-or off-site hydrologic alterations may not always fully be accounted for when routine delineation methods are used. Wetland Delineation-Mitigation-Permitting-Monitoring-Banking-Functional Analysis-T& E Surveys 3 Phase I Environmental Assessments-EAW's-Soil ID-Soil .Analysis & Delineation-Environmental Referrals Pond & Lake Weed Control & Fish Stocking-Tree Surveys-Natural Resource Management Plans