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potential for algal blooms (See FEIR Appendix 10 . 12) . A pipeline right-of-way from Old River to the southern portion of the marina must be secured to operate the recommended forced circulation system. • Operation of the forced circulation system must be made contingent on water temperature monitoring within the marina . • See FEIR, Section 4 . 7 . 0-5 . Potentially Significant Impact : Marina Construction Impact on Water Ouality [ Impact 4 . 7-51 Water quality in Old River could be impacted by increased turbidity caused during construction of the proposed marina . Finding : Changes or alterations have been required in, or incorporated into, the Project which avoid or substantially lessen the significant environmental effect as identified in the FEIR to a non-significant level . These mitigation measures are listed below. The RWQCB also has responsibility to implement this measure. Statement of Fact : The impact will be mitigated by the following : • To mitigate the impact of construction activities at the marina as much excavation and levee construction as possible must be completed prior to breaching the Old River levee. During levee breaching, a silt curtain must be installed within Old River to trap sediment carried into the river from the marina area . • See FEIR, Section 4 . 7 . 0-6 . Potentially Significant Impact • Shallow Groundwater Levels [Impact 4 . 7-61 Ultimate development of the Project Site could cause a rise in shallow groundwater levels as a result of removal of subsurface drains . Finding : Changes or alterations have been required in, or incorporated into, the Project which avoid or substantially lessen the significant environmental effect as identified in the FEIR to a non-significant level . These mitigation measures are listed below. C2-39 0189r/0202r