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HARBOR BLVD. MIXED USE TRANSIT CORRIDOR PLAN FINAL FIR <br />CITY OF SANTA ANA <br />5. Environmental Analysis <br />HYDROLOGY AND WATER QUALITY <br />Table 5.7 -3 Water Quality Impairments <br />Water Body <br />Pollutant <br />Total Maximum Daily Load (rMDL) Status <br />Anaheim Bay <br />Dielddn (tissue) <br />Required, expected completion date 2019 <br />Nickel <br />Required, expected completion date 2019 <br />PCBs (Polychlorinated <br />biphenyls) (tissue) <br />Required, expected completion date 2019 <br />Sediment Toxicity <br />Required, expected completion date 2019 <br />East Garden Grove Wintersburg <br />Channel <br />Ammonia (un- ionized) <br />Required, expected completion date 2021 <br />Huntington Harbor <br />Chlordane <br />Required, expected completion date 2019 <br />Copper <br />Required, expected completion date 2019 <br />Lead <br />Required, expected completion date 2019 <br />Nickel <br />Required, expected completion date 2019 <br />PCBs (Polychlorinated <br />biphenyls) (tissue) <br />Required, expected completion date 2019 <br />Pathogens <br />Required, expected completion date 2019 <br />Sediment Toxicity <br />Required, expected completion date 2019 <br />Soumz: USEPA 2011a. <br />Dieldrin and chlordane are organochlorine insecticides. Poydibrinated biphenyls (PCBs) are chlorinated hydrocarbons that were lonnerly used as insulation and coolant in <br />electrical equipment <br />Groundwater <br />The project area lies over the Main Orange County Groundwater Basin (Basin) that underlies most of north <br />and central Orange County (see Figure 5.7 -3, Main Orange County Groundwater Basin). <br />Groundwater Quality <br />Most water pumped from the Basin for municipal use is of potable quality. Five water treatment systems treat <br />groundwater ffom the Basin for four types of contaminants: salinity; total dissolved solids (IDS); nitrate; and <br />color from the remains of ancient vegetation. The facilities, and contaminants that each facility treats, are: <br />■ Tustin Main Street Desalter: nitrate <br />■ Tustin 17� Street Desalter: nitrate, TDS <br />■ Mesa Colored Water Treatment Facility: colored water <br />■ Irvine Ranch Water District (IRWD) Deep Aquifer Treatment System: color <br />• IRWD Irvine Desalter: salt <br />In 2010, the total volume of water treated at seven treatment facilities in Orange County, five of which are <br />within the Basin, was 17,864 acre -feet. This is less than 10 percent of the 201,075 acre -feet of groundwater <br />pumped from the Basin that year. The Basin provides 60 to 70 percent of the domestic water for 2.55 million <br />people (Malcolm -Punic 2011). <br />Page 5.7 -12 PlaceWorkr <br />