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SEH <br /> Bu''id'ng a Better World <br /> for All of Use MEMORAN DU M <br /> TO: Ali Elhassan, MCES <br /> FROM: Amy Prok, Patti Craddock <br /> DATE: March 12, 2020 <br /> RE: Mississippi River Water Quality Summary <br /> MCES Contract No. 16P135E, PO 19006941 <br /> SEH No. MCES 150732 14.00 <br /> A. Introduction <br /> The primary objective of this analysis is to characterize the water quality of the Mississippi River as a potential <br /> drinking water source for the Northwest metro area communities of Corcoran, Dayton, Ramsey, and Rogers. <br /> In addition, the analysis includes a preliminary comparison of water quality upstream and downstream of the <br /> Crow River in consideration of the location of the water supply intake structure. <br /> B. Database Sources <br /> The primary source of data utilized in this analysis was collected by Metropolitan Council Environmental <br /> Services as part of their Conventional River Water Monitoring Program. The data were obtained from the <br /> MCES' Environmental Information Management Systems (EIMS)database. This online resource provides <br /> water quality data for waterbodies in the region. The MCES database for the Anoka site (river mile 871.6) is <br /> very complete and covers a wide range of constituents starting in 1976 for some constituents. <br /> Data from other monitoring sites are also included in the analysis to compare water quality at several points <br /> along the Mississippi River, including upstream and downstream of the Crow River confluence. The <br /> downstream sites reviewed are the MCES' Conventional River Water Monitoring Program in Fridley (river mile <br /> 862.8)and the Fridley site in the Minnesota Department of Health's database. The upstream site is <br /> represented by the St. Cloud site from the MDH's database. The MDH database is not as comprehensive as <br /> the data available from the MCES monitoring program, but provides a larger dataset for some constituents of <br /> interest for drinking water, such as TOC, Cryptosporidium, and Giardia. <br /> Figure 1 presents the location of the sampling sites and Table 1 summarizes the databases and sites used in <br /> this analysis. <br />