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PotentiallyLess Than Less Than Analyzed Significant with Significant Mitigation Significant No In The Impact Incorporated Impact Impact Prior EIR X. HYDROLOGY AND WATER QUALITY. Would the project: a) Violate any water quality standards or waste discharge requirements or otherwise substantially F1 LlEl El surface or ground water quality? b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge El � � ❑ ❑ such that the project may impede sustainable groundwater management of the basin? c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the ❑ ❑ ❑ addition of impervious surfaces, in a manner which would: i) result in substantial erosion or siltation on-or off- ❑ ❑ F1site; ii) substantially increase the rate or amount of surface runoff in a manner which would result in ❑ flooding on-or off-site; iii) create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide El El Elsubstantial additional sources of polluted runoff; or iv) impede or redirect flood flows? ❑ ❑ X ❑ d) In flood hazard, tsunami, or seiche zones, risk � ❑ ❑ release of pollutants due to project inundation? X❑ ❑ e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater ❑ ❑ El plan? Impact Discussion: The proposed project's impact on hydrology and water is expected to be less than significant. The project will be served by the existing onsite well and septic system. The existing services were constructed under permit, and construction of any new individual domestic water well will require permit and inspection by the Environmental Health Department. The sewage disposal system must comply with the onsite wastewater treatment systems standards of San Joaquin County. Therefore, the proposed project's impact on these resources will be less than significant. The proposed project does not propose any substantial alteration to a drainage pattern, stream or river. All necessary drainage improvements onsite will be required as conditions of the construction of the project. The project will not result in substantial soil erosion because the site will be paved and landscaped subject to building code requirements. Development Title Section 9-1135.2 requires all development projects to provide drainage facilities within and downstream from the development project. Storm water runoff shall be conveyed into a terminal drain or may be retained in a retention basin. The Department of Public Works requires that drainage facilities be provided in accordance with the PA-1900243 (UP) & PA-2000023 (DA)— Initial Study 18