AgdaPkt 2016-04-25 Closed and Joint SA PFA

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7.B. - Page 82 2 Environmental Analysis collected and analyzed groundwater samples at the site for the proposed project,and the results were well below the Soluble Threshold Limit Concentration (STLC) for contaminant concentrations classified as hazardous (see Environmental Site Assessment in Appendix G). Regulatory Setting. The CWA establishes the legal foundation for regulating surface water quality throughout the nation. The Porter-Cologne Water Quality Act predates the CWA and requires reporting discharge of waste to land or surface waters. Sections 303 and 304 of CWA provide water quality standards and guidelines for all surface waters of the United States. "Waters of the US" is a term that includes navigable water bodies, tributaries of navigable waters,and adjacent wetlands. Section 401 requires that discharges to waters of the US obtain certification from the state that the discharge complies with applicable requirements for protecting water quality in the area. Section 402 of the CWA establishes the National Pollution Discharge Elimination System (NPDES),a permitting system for any discharges into waters of the US, enforced by the SWRCB and RWQCBs. Section 404 of the CWA gives the USACE jurisdiction over regulating the discharges of dredge or fill material in waters of the U.S. The SFRWQCB Basin Plan identifies Redwood Creek as having wildlife habitat,warm-freshwater habitat,and recreational water opportunities (WRECO, 2013). The City is a member of the San Mateo County Water Pollution Prevention Program (SMCWPPP), which shares a common NPDES permit. The project area would be within San Mateo County and Redwood City NPDES Permit No. CA-5612008 (WRECO, 2013). Provision C.3 (Stormwater Technical Guidance) of the MRP requires projects to evaluate and implement permanent post- construction stormwater treatment and hydromodification mitigation. The MRP outlines the state's requirements for municipal agencies in San Mateo County to address water quality and stormwater runoff issues (WRECO,2013). Under NPDES regulations, a project that would disturb more than one acre of land would be subjected to the NPDES General Permit for Stormwater Discharges Associated with Construction Activity (Order No. 2009-0009-DWQ). Projects that create less than 10,000 square feet of impervious surface need to implement erosion control measures to the maximum extent practical under the provisions of the City's NPDES permit. The Federal Emergency Management Act (FEMA) is the nationwide administrator of the National Flood Insurance Program (NFIP) and enforces flood hazard assessment and mitigation for potential flood disasters. Executive Order 11988 of Title 23 Code of Federal Regulations,Part 650, Subpart A (23 CFR 650A, directs federal agencies to avoid short-term and long-term impacts associated with modifications to floodplains and discourages incompatible development within floodplains. 2-42 US 101 Pedestrian Undercrossing and Bair Island Road Storm Drain Pump Station Project