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0 <br />a�SaU��e•�i�e�, <br />Port of Houston Authority <br />Wetland Mitigation Plan <br />Performance Standards <br />a. Planted vegetation must exhibit at least 50% survival at the first post - <br />construction monitoring event (45 days post -planting). <br />b. Cover of desirable vegetation in the flooded zones and non -planted areas <br />within the wetland footprint equal to or exceeding 70% by the end of <br />Phase 1 (3 years). <br />c. Cover of desirable vegetation in the planting zones and non -planted <br />areas within the wetland footprint equal to or exceeding 70% throughout <br />Phase II (2 years). <br />Corrective Actions <br />a. If 50% survival of planted vegetation is not exhibited during the first post - <br />construction monitoring event, replanting will be required at the original <br />density in areas where 50% survival is not exhibited. Replanting will <br />occur as soon as it is biologically and logistically feasible, but no later <br />than the beginning of the next growing season. <br />b. If the percent cover of desired species does not meet or exceed 70% at <br />the end of Phase 1 (3 years), The PHA will be required to evaluate the <br />cause of the unacceptable growth and recommend an appropriate <br />response. Appropriate responses could include modifications to site <br />hydrology, replanting, introduction of different species, or no action. <br />c. If the percent cover of desired species does not meet or exceed 70% <br />throughout Phase II (2 years), The PHA will be required to evaluate the <br />cause of the unacceptable growth and recommend an appropriate <br />response. <br />Control of Undesirable Vegetation <br />Some of the of the vegetation that will grow voluntarily in the planting zones will be considered <br />undesirable vegetation. Undesirable species are typically exotic species or invasive native <br />species that provide poor habitat and forage, or impede the establishment and maintenance of <br />desirable species. Some undesirable species will cause little harm and may be tolerated. Other <br />species will adversely impact wetland development and will not be tolerated. Plant species to <br />be controlled during the wetland creation construction and monitoring periods are discussed <br />.33 . <br />Benchmark Ecological Services, Inc. June 2002 <br />S U, £_2* LA b .4 S Li <br />