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Potentially Less Than Significant withMitigation g Less Than Analyzed g Si nificant 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 degrade surface or F] ❑ 0 F] Elground water quality ? b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater ❑ ❑ ❑X ❑ ❑ 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 ❑ ❑ ❑ 0 ❑ surfaces , in a manner which would : I) result in substantial erosion or siltation on - or off-site ; ❑ ❑ ❑ © ❑ ii ) substantially increase the rate or amount of surface runoff in a manner which would result in flooding on - ❑ ❑ ❑ F ❑ or off-site ; iii ) create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional ❑ ❑ ❑ F ❑ sources of polluted runoff; or iv) impede or redirect flood flows ? ❑ ❑ ❑ ® ❑ d ) In flood hazard , tsunami , or seiche zones , risk release of pollutants due to project inundation ? ❑ ❑ ❑ © ❑ e ) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management ❑ ❑ ❑ ® ❑ plan ? Impact Discussion : This project is comprised of three applications : General Plan Amendment No . PA-2200277 to amend the map designation of 2 APN ' s composed of 10 legal lots from C/C ( Community Commercial ) to R/ M ( Medium Density Residential ) and Zone Reclassification No . PA-2200278 , which proposes to change the current zoning designation of the same parcels from C-C ( Community Commercial ) and P - F ( Public Facilities ) to R- M ( Medium Density Residential ) ; and an Administrative Use Permit to develop a Multi - Unit Residential project to include a two -story four- plex totaling 4 , 184 square feet and an 822 square foot accessory dwelling unit on a new parcel configuration created by Lot Line Adjustment No . PA-2200168 . The project site currently has eight existing non -conforming single-family dwellings and proposes the demolition of four existing single-family residences and an accessory storage structure . Additionally , the project proposes to construct two single family residences , two accessory dwelling units and two duplexes . a- b , e) The subject parcel submitted a will -serve letter from San Joaquin County Public Works proposing service from Mokelumne Acres Maintenance District for water and storm drainage and a wilkserve letter from Woodbridge Sewer District for sewer upon submittal of construction plans . As a result, impacts to water quality , groundwater, and storm drainage and any related implementation or management plans are expected to be less than significant . c) The site is also approximately 1 , 200 feet south of the Mokelumne River . The proposed project is not anticipated to violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality , conflict with or obstruct implementation of a water quality control plan or sustainable 19