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TCAAP AUAR Update 13 August 2019 will be designed in accordance with acceptable industry standards and in conformance with jurisdictional requirements. • The runoff rate will be reduced to 80% of the existing rate because the study area is located within a Flood Management Zone as defined by the RCWD. • The primary method of stormwater treatment will be the use of multiple ponds for the removal of total phosphorous and total suspended solids. Water reuse, bio-filtration, filtration, and stormwater wetlands are also suitable for treatment within the study area. • No discharge water will be directed to surface waters without prior retention in a temporary settling basin and a determination that no contamination exists. The developer will determine if groundwater is contaminated as a basis for determining discharge to storm sewer, sanitary sewer, or through a treatment process such as the existing groundwater treatment facilities. Temporary construction dewatering will require a Temporary Water Appropriations General Permit 1997-0005 if less than 50 million gallons per year and less than one year in duration. • Wetland impacts will be replaced at a 2:1 ratio through a combination of on- and off-site replacement through plans/permit approved by the RCWD and USACE. The following mitigation measures from the 2014 AUAR have been completed: • The new crossing of Rice Creek would be via a bridge that spans the creek, wetlands and floodplain, and would allow wildlife to cross underneath. A trail crossing at this location may also be considered (under the creek bridge). The bridge will be designed to avoid impact on the floodplain. The following are additional mitigation measures from this AUAR update: • Proposed development will follow the approach outlined in the CSMP to meet RCWD’s Water Quality Treatment and Peak Stormwater Runoff Control requirements. 5.4. Contamination/Hazardous Materials/Solid Wastes The following mitigation measures from the 2014 AUAR remain valid: • Handling of site contaminants is addressed in the overall Response Action Plan (RAP) approved for the site and/or within the 4 subarea RAPs addressing key hot spot remediation. • In areas of previous volatile organic compound (VOC) contamination, testing or abatement measures for VOC vapors may be required by the City to avoid potential impacts of VOC vapors in new building spaces. • Construction materials would be either recycled or disposed in the proper facilities. • Solid waste recycling will be required by city code for residential users and may be added to city code in the future for commercial users. No additional mitigation measures were identified as part of this AUAR update. 5.5. Fish, Plant Communities, and Sensitive Ecological Resources The following mitigation measures from the 2014 AUAR remain valid: