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Mo Hafet -2- 27 May 2016 San Joaquin County Community Development Department Antidegradation Considerations All wastewater discharges must comply with the Antidegradation Policy (State Water Board Resolution 68-16) and the Antidegradation Implementation Policy contained in the Basin Plan. The Antidegradation Policy is available on page IV-15.01 at: http://www.waterboards.ca.gov/board decisions/adopted orders/resolutions/1968/rs68 016.pdf In part it states: Any discharge of waste to high quality waters must apply best practicable treatment or control not only to prevent a condition of pollution or nuisance from occurring, but also to maintain the highest water quality possible consistent with the maximum benefit to the people of the State. This information must be presented as an analysis of the impacts and potential impacts of the discharge on water quality, as measured by background concentrations and applicable water quality objectives. The antidegradation analysis is a mandatory element in the NPDES and land discharge WDRs permitting process. The environmental review document should evaluate potential impacts to both surface and groundwater quality. Pursuant to the State Board's Onsite Wastewater Treatment Systems Policy, the regulation of the septic system may be regulated under the local agency's management program. Construction Storm Water General Permit Dischargers whose project disturb one or more acres of soil or where projects disturb less than one acre but are part of a larger common plan of development that in total disturbs one or more acres, are required to obtain coverage under the General Permit for Storm Water Discharges Associated with Construction Activities (Construction General Permit), Construction General Permit Order No. 2009-009-DWQ. Construction activity subject to this permit includes clearing, grading, grubbing, disturbances to the ground, such as stockpiling, or excavation, but does not include regular maintenance activities performed to restore the original line, grade, or capacity of the facility. The Construction General Permit requires the development and implementation of a Storm Water Pollution Prevention Plan (SWPPP). For more information on the Construction General Permit, visit the State Water Resources Control Board website at: http.//wwwwaterboards.ca.gov/water issueslprograms/stormwater/constpermits.shtml Phase I and II Municipal Separate Storm Sewer System (MS4) Permits' The Phase I and II MS4 permits require the Permittee to reduce pollutants and runoff flows from new development and redevelopment using Best Management Practices (BMPs) to the maximum extent practicable (MEP). MS4 Permittees have their own development standards, also known as Low Impact Development (LID)/post-construction standards that include a ' Municipal Permits=The Phase I Municipal Separate Storm Water System (MS4) Permit covers medium sized Municipalities(serving between 100,000 and 250,000 people)and large sized municipalities(serving over 250,000 people). The Phase II MS4 provides coverage for small municipalities,including non-traditional Small MS4s,which include military bases, public campuses, prisons and hospitals.