SITE INFORMATION AND CORRESPONDENCE 2000-2018

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Heather Shaddox -3- 30 October 2015 Petralogix Engineering, Inc. 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. 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://www.waterboards.ca.gov/water issues/programs/stormwater/constpermits.shtmI 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 hydromodification component. The MS4 permits also require specific design concepts for LID/post-construction BMPs in the early stages of a project during the entitlement and CEQA process and the development plan review process. For more information on which Phase I MS4 Permit this project applies to, visit the Central Valley Water Board website at: hftp://www.waterboards.ca._qov/centralvalley/water issues/storm water/municipal permits/ For more information on the Phase 11 MS4 permit and who it applies to, visit the State Water Resources Control Board at: http://www.waterboards.ca.gov/water issues/programs/stormwater/phase ii municipal shtml Industrial Storm Water General Permit Storm water discharges associated with industrial sites must comply with the regulations contained in the Industrial Storm Water General Permit Order 2014-0057-DWQ. ' 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.