2014-069 - Final Environmental Impact Report No. 2014-01

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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL EIR CITY OF SANTA ANA 5. Environmental Analysis HYDROLOGY AND WATER QUALITY Impact 5.7 -4: During the construction phase of the individual development projects that would be accommodated by the Harbor Corridor Plan, adherence to the General Construction Activity Permit would reduce short-term pollutant concentrations from individual development sites. [Thresholds HYD -1 (part) and HYD -6 (part)] impact Analysis: Grading and construction activities of individual development projects that would be accommodated by the Harbor Corridor Plan could generate oil and grease, trash and debris, pesticides, other organic compounds such as solvents, degreasers, and compounds in coatings. This would result in a short - term significant impact on stormwater quality. However, project applicants for individual development projects would be required to comply with existing water quality standards and waste discharge requirements during all grading and construction activities. The GCP issued by SWRCB regulates construction activities on sites of one acre or greater to minimize water pollution, including sediment and pollutants. Individual development sites would be subject to the GCP, including the development and implementation of a SWPPP. Project applicants of individual development projects in the project area would be required to prepare and implement SWPPPs. The SWPPP would specify BMPs that individual project applicants would implement for protecting water quality by eliminating and /or minimizing stormwater pollution prior to and during grading and construction and show the placement of those BMPs. Typical categories of BMPs included in SWPPPs are described in Table 5.7 -5. Table 5.7 -5 Construction BMPs Category Purpose Examples Cover and /or bind soil surface, to prevent soil Mulch, geotextiles, mats, hydroseeding, Erosion Controls particles from being detached and transported by earth dikes, swales water or Wind such as straw bales, sandbags, Sediment Controls Filter out soil particles that have been detached and fiber rolls, and gravel bag berms, desilting transported in water. basin, cleaning measures such as street sweeping Wind Erosion Controls The aims and methods of wind erosion control are See Erosion Controls above. similar to those of erosion control described above. Stabilized construction roadways and Tracking Controls Minimize the tracking of soil offsite by vehicles construction entrances/exits, entrance/outlet tire wash. Prohibit discharge of materials other than stormwater, such as discharges from the cleaning, BMPs specifying methods for g maintenance, and fueling of vehicles and paving and grinding operations, cleaning, NonStorm Water Management equipment. Conduct various construction fueling, and maintenance of vehicles and Controls operations, including paving, grinding, and concrete equipment, concrete curing, concrete curing and finishing, in ways that minimize non - finishing. stormwater discharges and contamination of any such discharges. Waste Management and Controls Management of materials and wastes to avoid Spill prevention and control, stockpile (i.e., good housekeeping practices) contamination of stormwater. management, and management of solid wastes and hazardous wastes. October 2014 Page 5.7 -23