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HydroBase Data <br />The data for the 1950 to present period of record pertaining to Chatfield Reservoir include the <br />following: <br />End-of--Month Contents (see Figure 16) <br />• End-of--month contents missing for February 1976, December 1985, and October 1997. <br />These data have been filled via linear interpolation from surrounding monthly values in <br />Figure 16. <br />Figure 16 <br />Chatfield Reservoir End-of--Month Storage Contents <br />60 <br />000 <br />, <br />so <br />ooo <br />, <br /> <br />.. <br />~ 40 <br />000 <br />, <br /> <br />0 <br />U <br />d <br />an <br />000 <br />c 30 <br />, <br /> <br /> <br />0 <br />20 <br />000 <br />, <br />0 <br /> <br />W <br />10 <br />000 <br />, <br />0 <br /> <br />O M ~O O~ N v1 00 ~ h O M ~O O~ N v1 00 ~ <br />v1 v1 v1 v1 ~O ~O ~O h h h 00 00 00 00 O~ O~ O~ O O <br />ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti <br />Return Flow Locations <br />Return flows from Denver Water's operations are treated at six wastewater treatment plants <br />(WWTP). The two primary treatment plants are the Metro WWTP and Littleton-Englewood <br />WWTP (aka Bi-City WWTP), as shown in Figure 1 and Figure 2. Lesser amounts of return <br />flows from Denver Water raw water supplies are treated at the Glendale, Clear Creek Valley, <br />South Adams County, and Broomfield WWTPs. <br />The Metro WWTP is located on the south side of the South Platte River approximately 1/8 mile <br />upstream from the Sand Creek confluence and downstream of the Burlington Ditch headgate <br />(Structure ID 0200802). The Metro WWTP has been located at this site since the late-1960s and <br />treats water from the Denver Water system along with about 54 other governmental entities in <br />Denver Water Board Operating Memorandum 28 of 40 <br />