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V. EFFECTS BETEI~IvlINED TO BE MITIGATABLE TO A LEVEL OF INSIGNIFICANCE WATER QUALITY Significant Effect In the short term, erosion could occur during construction of the proposed project. Over the long term, the proposed project would result in continued surface runoff from the project site. Finding Finding Changes or alterations have been required in, or incorporated into, the project which avoid or substantially lessen the significant environmental effect identified in the Final EIR. Facts in the Support of the Finding Grading and construction will result in disruption of the existing site, which could result in wind and water erosion. [n the long term, surface runoff from the project site would continue and would be expected to contain urban related constituents, including concentrations of lead, copper, zinc and other materials. These effects can be substantially reduced, to a level of insignificance, through project design and other mitigation measures as identified in the Final EIR. The mitigation measures to reduce these effects as incorporated in the proposed project are: The project will require installation and maintenance of erosion control devices in accordance with the policies of the City of Santa Aha. These devices will not be removed or modified without the approval of the City Building officials. o During the rainy season~ equipment and materials will be stored on site for rapid construction of temporary erosion control devices, Workers and equipment will be available for emergency construction and maintenance of these devices, Removable erosion protection devices will be in place at the end of each working day when the five day rain probability forecast exceeds ~,0 percent, After a rainstorm, the contractor will remove all silt and debris from streets, check berms and basins. Should any project generated sediment be deposited in City storm drains during construction, the Register shall fund any required cleanup to the mutual satisfaction o[ the Register and the City, Graded areas on the site perimeter will be graded to drain away from the [ace of slopes at the end of each working day. Drainage will be directed toward desilting facilities. The contractor will take necessary precautions to prevent trespass or public access onto areas where water is impounded. ge An emergency telephone number will be posted by the Contractor for immediate notification if emergency conditions arise.