ORANGE, COUNTY OF (3) - 2012 - Laserfiche WebLink

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Agreement D12-030 Exhibit A - Scope of Work On December 10, 2009, the Santa Ana Regional Water Quality Control Board issued Time Schedule Order (TSO) R8-2009-0069 to regulate groundwater-related discharges, particularly those containing elevated selenium levels, in the Newport Bay Watershed. The TSO mandates the County of Orange, Orange County Flood Control District, and other entities that are subject to the TSO, including the City of Santa Ana, to develop and implement a Best Management Practices Strategic Plan describing a phased approach for complying with the TSO requirements. In order to develop an effective plan, it is necessary to assess the potential for selectively diverting groundwater and surface waters containing elevated levels of selenium to the sanitary sewer. The work under this scope of work will focus on opportunities within the Santa Ana-Delhi Channel Watershed. The project, to be managed by the City of Santa Ana, will develop a Conceptual Design Report to provide information to base decisions on the viability of diversions of low flows in the Santa Ana-Delhi Watershed. The Report will include an evaluation of conceptual it layouts at candidate diversion locations, site requirements anticipated selenium loading reductions, preliminary costs, potential grant funding opportunities, necessary permits and regulatory issues from both a stormwater permit, TMDL and sanitary sewer permitting perspective. It is anticipated that the Orange County Sanitation District (OSCD) may require the stormwater diversion system to only discharge to OCSD during off-peak hours. As such, two project scenarios should be considered: 1) A continuous discharge to the sanitary sewer system: 2) Capture and pump discharge to the sanitary sewer system during off- peak hours. The relative emphasis of each in the Report will be shaped by feedback from OCSD. The following tasks will comprise the scope of work: Field Review A field review of candidate diversion locations will be conducted in the Santa Ana-Delhi Channel Watershed. The field review will gather pertinent information regarding each diversion location include field measurements of discharge rates, photo reconnaissance, facility location identification, and the preparation of a scaled aerial photo of the site (aerial photos obtained from commercial sources). Deliverables: • Site sketches based on field measurements for each project location • Low flow discharge measurements/estimation calculations • Site photos • Aerial photo with the project area overlay • Vicinity map for each location