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Mitigation Measures and Statements of Findings of Impacts Being Monitoring/ Responsible Monitorin /R g Significant and Unavoidable Reporting Action Party for Providing 9 eportin Timing Mitigation Responsibility g Less than significant impact after implementation of Mitigation Measure HAZARDS-1 through HAZARDS-3. 4.10 Hydrology and Water Quality HYDRO-1:All basin areas that would be used as evaporation ponds for onsite Verification by County Union Pacific,working with San Joaquin County Prior to operation of onsite industrial wastewater(stormwater and washdown from onsite facilities which San Joaquin County and Community Development ponds and duringproject has been treated by an AdvancedOil-Water Separator)shall meet all state and Regional Water Quality Department and Public operations p lett local requirements for evaporation pond liners.Additionally, ponds shall be Control Board Works Department p double-lined with impermeable material and fitted with an automatic leak detection system between the two layers of impermeable material.Monitoring for leak detection shall be completed(automatically)on a continuous basis throughout the duration of project operations. In the event that a leak is detected,the project applicant shall ensure that the pond is drained and the liner repaired prior to continuance of use.The project applicant shall ensure that continued use of the evaporation pond, in the event of a leaking liner, is explicitly prohibited until the liner is repaired.In the event of a liner material failure, UP shall notify its Response Management Communications Center (RMCC)who will in turn contact the appropriate response and regulatory agencies,such as the Environmental Protection Agency,the Regional Water Quality Board,Office of Emergency Services,and/or the National Response Center,or take such other action as is required by applicable law. Less than significant impact after implementation of Mitigation Measure HYRDO-1. 4,10 Hydrology and Water Quality(cont) HYDRO-2:The applicant shall ensure that a comprehensive onsite grading, Verification by County Union Pacific San Joaquin County Public Prior to grading permit drainage,and erosion control plan(drainage plan)for the project is prepared by a Works Department certified engineer.The applicant shall submit the drainage plan to the San Joaquin County Public Works Department for approval,and ensure that all recommendations of the drainage plan are implemented.The drainage plan shall include all facilities included in the project.The drainage plan shall include design specifications for all stormwater control facilities proposed for the project site, including stormwater retention ponds and stormwater collection and conveyance facilities.Facilities shall be designed to infiltrate,retain,or otherwise channel runoff away from areas of open soil and other features subject to erosion or flooding in accordance with County requirements.County approval of the drainage plan shall be verified prior to issuance of grading or building permits. Less than significant impact after implementation of Mitigation Measure HYRDO-2. HYDRO-3:The project applicant shall implement Mitigation Measures HYDRO-1 See HYDRO 1 and 2. See HYDRO 1 antl 2 See HYDRO 1 and 2 See HYDRO 1 and 2 and 2.These measures would ensure that the project's contribution to cumulative hydrology and water quality impacts would be less than significant.