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Last modified
1/26/2010 2:56:55 PM
Creation date
10/12/2006 4:04:11 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8449.700
Description
Cherry Creek
State
CO
Basin
South Platte
Date
9/1/1995
Author
Halepaska & Assoc.
Title
Phase 1 Baseline Water Quality Data Collection Study for the Upper Cherry Creek Basin - Final Report
Water Supply Pro - Doc Type
Publication
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />JCHA <br /> <br />final ReDOrt. Phase I BllliUlline Water OuaIitv Data CoDectioD Studv <br /> <br />Seotember 1995 <br /> <br />Based on the temporal loading rates to the reservoir, as shown in Figure 12, the cumulative total <br />phosphorus load to the reservoir for the study period (August 1994 through July 1995) is <br />approximately 3,440 Ibs. (Figure 13). This is approximately 24 percent of the allowable <br />phosphorus load to the Reservoir. <br /> <br />There are currently three treatment plants that are potential point dischargers in the upper Cherry <br />Creek Basin in the stream reach being studied in this Phase I baseline program. These point <br />dischargers are the Pinery Water and Wastewater District, Parker Water and Sanitation District <br />and Lincoln Park Metropolitan District. Arapahoe Water and Sanitation District (including the <br />Cottonwood Water and Sanitation District), discharges in the Cottonwood Creek drainage, which <br />flows directly to the Reservoir and not to the main stem. <br /> <br />We have obtained data submitted on the discharge monitoring reports (DMRs) from each of <br />these entities, which are filed monthly with the Colorado Department of Public Health and <br />Environment (CDPHE). Table 6 identifies the phosphorus discharge data from these DMRs for <br />the study period to identify the point discharges of total phosphorus that have been made to <br />Cherry Creek over the study period. <br /> <br />We have then compared these DMR data to the total phosphorus loading to Cherry Creek <br />Reservoir from the Cherry Creek main stem, as measured at well MW-9 for the Cherry Creek <br />alluvial ground water, and at CC-9 for surface flows into the reservoir. A mass balance, <br />comparing the phosphorus loading measured entering the reservoir from the main stem of Cherry <br />Creek to the point discharges, yields contributions related to non-point sources (making the <br />conservative assumption that none of the phosphorus discharged by the treatment plant was <br />adsorbed or utilized by plants). <br /> <br />Based on these assumptions, we have plotted the point vs. non-point contribution of phosphorus <br />to Cherry Creek Reservoir from the Cherry Creek main stem (Figure 15). When these point <br /> <br />-14- <br />
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