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<br />Port of Houston Authority <br />Wetland Mitigation Plan <br /> <br />Port of Houston Authority No. 21520(Revised) <br />.'veston Bay, along the Bayport ~ Channel, <br />~ty of Pasadena, Harris County, Texas. <br />Attachment 1, Sheet l~ of~(Revised May 2003) <br /> <br />I (,.;..iV"; <br /> <br />. feet depth at full pool) will not be planted with obligate wetland plants, will be sprigged with <br />transitional species (facultative wet). The primary colonization mechanism will be encroachment <br />from planted zones and upland areas, the existing seed bank, and other natural means. Much of <br />the transitional zone is expected to take on characteristics of wet prairie, rather than emergent <br />marsh. <br /> <br />As a result of depth variation within the footprint of the created wetland, a variety of emergent <br />plant species will be supported. Frequency and duration of flooding will also vary as a function <br />of depth and will impact the ultimate plant community structure over time. Areas with a <br />maximum depth ranging from 1.0 to 1.5 feet are expected to remain wet during most of the year, <br />except during prolonged dry periods. Shallower areas are expected to be inundated for shorter <br />periods depending on frequency, duration, and intensity of precipitation events in any given <br />year. These areas should be wet long enough, under normal rainfall patterns to exhibit <br />palustrine emergent wetland characteristics seen in seasonally flooded wetlands in this region. <br /> <br />. <br /> <br />Ecological Classification <br /> <br />Projected impacted resources resulting from the Bayport Project will include uplands (coastal <br />prairie and forested), wetlands (adjacent and isolated, emergent and forested) that provide <br />benefit to the coastal ecosystem. The Proposed Mitigation site will include many components <br />that are ecologically similar, and provide similar ecological services as those that will be lost at <br />the Bayport Project site. <br /> <br />Soils <br /> <br />Site soils (Beaumont Clay) are classified as hydric soils and typically exhibit some prim~ry and <br />secondary hydric soil characteristics (low chroma, slow permeability, nearly level). With <br />relatively minor hydrologic modifications, such as strategically located levees, shallow <br />impoundments that can retain surface runoff can be created. Long-term inundation (permanent <br />or intermittent) will ultimately result in the formation of additional weUand soil characteristics <br />(reducing conditions, oxide root channels, etc.). <br /> <br />. <br /> <br />Benchmark Ecological Services, Inc. <br /> <br />May 2003 <br />