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<br />i.; . 'y' ~ ')...n.t';..... <br />~"ii ti : / !-Vi..;J <br /> <br />e <br /> <br />Port of Houston Authority tt. 21520(Revised) <br />Galveston Bay, along the Bayport Ship Channel, <br />City of Pasadena, Harris County, Texas. <br />Attachment I, Sheet 1.0 of~(Revised May 2003) <br /> <br />Port of Houston Authority <br />Wetland Mitigation Plan <br /> <br />. <br /> <br />Vegetation <br />Planted vegetation within the created wetland project area will consist of hydrophytic emergent <br />species. <br /> <br />Leve~s, and all disturbed areas outside the marsh footprint will be planted with ~ .quick cover <br />plant such as ryegrass (Lo/ium L sp.), but will be allowed to re-vegetate with native and <br />introduced plant species from the seed bank. Sprigging of native vegetation will also be <br />conducted to enhance prairie restoration efforts. <br /> <br />Plants to be controlled (undesirable plants) within the created wetland include Chinese tallow <br />(Sapium sebiferum), Cattail (Typha spp.), and Pink ammania (Ammania latifo/ia). Chinese tallow <br />is considered an intolerable species and will be controlled within the created wetland throughout <br />the construction and monitoring phases of the project. Cattail and Pink ammania will be <br />controlled only during the first growing season, or until the planted species and other desirable <br />species have sufficiently established themselves to effectively compete. Other invasive <br />volunteer plants that appear in the wetland that threaten adequate coverage by planted and <br />other desirable species will be controlled appropriately. Numerous other locally occurring <br />desirable species may potentially appear as volunteer invasives and will be allowed to become <br />established along with planted species. This will increase the plant species diversity in the <br />wetland and, hence, increase the ecological value of the system. <br /> <br />. <br /> <br />Hydrology <br /> <br />The proposed wetland creation project will capitalize on the natural tendency of the Beaumont <br />Soils to develop hydric characteristics by impounding runoff, creating shallow planting zones <br />suitable for the development and maintenance of hydrophytic plant communities. The existing <br />hydrology will be modified by constructing levees to channel and hold runoff. In order to <br />increase the habitat diversity and provide for greater water storage capacity, designated areas <br />within the weUand will be excavated so that deeper, more permanenUy flooded areas occur. <br />This will increase the likelihood that those portions of the weUand will remain flooded during <br />normal weather conditions and longer during prolonged periods of drought. <br /> <br />. <br /> <br />Benchmark Ecological Services, Inc. <br /> <br />May 2003 <br />