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of Santa Ana Main Place Mall Transformation <br />Water Supply Assessment <br />conservation, local resources such as water recycling and groundwater recovery, Colorado River supplies <br />and transfers, State Water Project supplies and transfers, in -region surface reservoir storage, in -region <br />groundwater storage, out -of -region banking, treatment, conveyance and infrastructure improvements. <br />Environmental, legal, and climate change factors were considered by MWD in its assessment. <br />Water supply reliability also includes water quality considerations. Both MWD and OCWD monitor water <br />quality extensively to manage water quality. Over 300,000 water quality tests are performed per year on <br />MWD's water to test for regulated contaminants and additional contaminants of concern to ensure the <br />safety of its waters. MWD's supplies originate primarily from the Colorado River Aqueduct and from the <br />State Water Project. A blend of these two sources, proportional to each year's availability of the source, <br />is then delivered throughout MWD's service area. Section 3.6.2.3.1 of the UWMP outlines MWD's water <br />quality issues of concern. <br />OCWD is responsible for managing the OC Basin. To maintain groundwater quality, OCWD conducts an <br />extensive monitoring program that serves to manage the OC Basin's groundwater production, control <br />groundwater contamination, and comply with all required laws and regulations. A network of nearly 700 <br />wells provides OCWD a source for samples, which are tested for a variety of purposes. OCWD collects 600 <br />to 1,700 samples each month to monitor OC Basin water quality. These samples are collected and tested <br />according to approved federal and state procedures as well as industry -recognized quality assurance and <br />control protocols. Section 3.6.2.3.1 of the UWMP outlines OCWD's water quality issues of concern. <br />4.4.1 Normal -Year Reliability Comparison <br />The City has entitlements to receive imported water from MWD via the regional distribution system. <br />Although pipeline and connection capacity rights do not guarantee the availability of water, per se, they <br />do guarantee the ability to convey water when it is available to the MWD distribution system. All imported <br />water supplies are assumed available to the City from existing water transmission facilities. The demand <br />and supplies listed below also include local groundwater supplies that are available to the City through <br />OCWD by a pre -determined pumping percentage. <br />For the 2015 UWMP, the normal dry year was selected as the City's 2015 demand as shown in Table 2. <br />Due to ongoing drought conditions within California and the increased implementation of water efficiency <br />measures, 2015 was determined to represent an average water demand for this UWMP. <br />KimleyoHorn 55 -24 Page 116 <br />