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called RiverWatch). Flow data was collected at a USGS monitoring station, also labeled 5988 on <br />the sampling location map shown in Figure 3. However, flow data was not always present when <br />hardness samples were collected. <br />Y <br />�1� =v <br />Afma <br />C�tpk Cnw � <br />fAtIN �. <br />Gi�ICi a <br />j 5J1�] <br />� SHit] <br />'u+rerww.ar,. G'sEC +2 <br />South Motquto Croc y;6s <br />CQSPUSC?e <br />6SAlo1 <br />' NO Narr:e Crcek 1 cvru MosqutOCreek +w i <br />COSPUS02o <br />CoSPUS02a Approx. Location of i <br />Mock Hocking Mine <br />o,t, <br />Mies <br />ssb6 — <br />Fak S fiat^ <br />OF*" <br />Figure 3 - CDPHE Map of Mosquito Creek and Sampling Locations [2] <br />The USGS Flow monitoring station was in operation from 1998 to 2005. It was decommissioned <br />in 2005 for reasons unknown but likely related to funding, according to a phone conversation with <br />a USGS Representative from the Colorado Water Science Center in July of 2014 [3]. Hardness <br />data was found monthly starting in 1992 and ending in 2006. Because of the lack of corresponding <br />hardness -flow data on some dates, it was difficult to calculate hardness corresponding with <br />periodic low flow criteria. Because of this fact, an approximation for hardness downstream were <br />calculated by taking the average hardness values of the months that are typically classified as low <br />flow months. The months used for this approximation include all months of the year except May, <br />June, July, and August. This approach resulted in an average hardness of 150.2 mg/L as CaCO3- <br />The supporting data and calculations resulting in this value can be seen below in Table 4. <br />