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EXHIBIT A Appendix ATTACHMENT I SCOPE OF WORK CITY OF SANTA ANA REQUEST FOR PROPOSALS SPILL RESPONSE, HAZARDOUS WASTE DISPOSAL, AND STORM DRAIN FACILITY MAINTENANCE SERVICES RFP NO.21-004 INTRODUCTION/BACKGROUND The City of Santa Ana is 27.2 square miles and is located in central Orange County, California. Santa Ana is the most densely populated city in the county, with a total population of 338,247 and approximately 12,435 people per square mile. Santa Ana sits within three major watersheds: the Newport Bay watershed, the Santa Ana River watershed, and the Anaheim Bay/Huntington Harbour watershed. The City of Santa Ana is a co-permittee under the North Orange County Municipal Separate Storm Sewer System (MS4) Permit (Order No. R8-2009-0030, as amended by Order No. R8-2010- 0062). The Permit presents a series of technical, legal, and regulatory challenges to the City and as a result, the City has established a rigorous National Pollutant Discharge Elimination System (NPDES) compliance program. The Permit requires the City to reduce pollutants discharged in urban runoff to the "Maximum Extent Practicable". In order to comply with the Permit, the City is required to clean and maintain its MS4 and treatment control Best Management Practices (BMPs), respond to and eliminate illegal discharges and illicit connections, and conduct cleanup of pollutants that could potentially impact the MS4. The City's stormdrain system includes, but is not limited to: • 1,600 stormwater catch basins, of which 1,275 have been retrofitted with Connector Pipe Screen (CPS) units and 139 have been retrofitted with Auto -Retractable Screens (ARS) • 215 culverts • 20 open channels • One stormwater lift station • Treatment control BMPs, such as: ■ Continuous Deflective Separation (CDS) Unit • Bioretention Basins • BioswalesNegetated Swales City of Santa Ana RFP 21-004 Page Al-1