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9 y3 En <br />HxH <br />�C C] <br />H xl <br />o H 't <br />xx V1H <br />Ci] O E <br />H C7 <br />OH <br />M 0 <br />CH <br />tj m <br />C- H <br />C, t7 En <br />R9L9 i1 <br />zHrn <br />r3 0 W <br />�f <br />4� <br />j`&tea <br />plan is in place to determine the ongoing success of the wetland vegetation. The purpose of this <br />contingency plan is to provide remedies if a key component of the project is found during <br />monitoring not to function. <br />Two items are addressed here that are central to the issue of success of the project. The <br />wetland plants must achieve the standard, and the hydrology must support the we,' rid. If the <br />wetland plants suffer unexpected mortality, more appropriate plants will be planted to achieve <br />the standard. If the reason that the plants don't survive is because the system does not maintain <br />enough water to function as a wetland, two remedies appear possible. One is to amend the soil <br />to decrease permeability and hold the water longer. This solution would appear to require <br />substantial disturbance of the wetland system and is not recommended. The other choice is to add <br />water. This appears to be the logical choice, and water could be piped in from a City water main, <br />come from a well, or the stormwater runoff from the adjacent Activities Center could be directed <br />into the wetland. The latter solution would appear to have a lot of merit. The outlet from the <br />runoff detention system will be at about the same elevation as the wetlands, and there is space <br />enough to route it through a grass -lined Swale to the wetland. If the wetland hydrology of the <br />new wetlands is found to be inad-quate, these solutions will be evaluated in more detail, and the <br />most appropriate remedy will be applied. <br />DAMES & MOORE <br />