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Boulder Creek at 75th St |
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Boulder Creek at 75th St |
For December, 2002 the WQI rating at Boulder Creek at 75th St (BC-75) was Medium (C) due to a WQI value of 53.50.
The chart below details the WQI calulations at this site. See the detailed explanation of the WQI method for more information.
| Parameter | Unit | Parameter Value | Q-value | Weight Factor | Total |
|---|---|---|---|---|---|
| DO% | % sat | 149.60 | 50.00 | 0.17 | 8.50 |
| Fecal Coliform | #/100 mL | 20.00 | 61.54 | 0.16 | 9.85 |
| pH | pH | 7.02 | 87.21 | 0.11 | 9.59 |
| Total Phosphate | mg PO4/L | 2.79 | 19.35 | 0.10 | 1.94 |
| Nitrates | mg NO3/L | 13.50 | 5.18 | 0.10 | 0.52 |
| Turbidity | NTU | 8.65 | 77.38 | 0.08 | 6.19 |
| Total Solids | mg/l | 6.39 | 81.13 | 0.07 | 5.68 |
| Totals (factors, total) | 0.79 | 42.26 | |||
| Adjusted WQI | 53.50 | ||||
The WQI is computed by converting measured Water Quality Parameters to "Q-Values" using charts developed by the National Sanitation Foundation (NSF) water quality scientists. The Q-Values are then multiplied by a weighting factor based on the importance of that water quality parameter. These values are totaled and then divided by the sum of the weight factors.