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Boulder Creek at 75th St |
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Boulder Creek at 75th St |
For May, 2002 the WQI rating at Boulder Creek at 75th St (BC-75) was Medium (C) due to a WQI value of 62.71.
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 | 112.90 | 95.27 | 0.17 | 16.20 |
| Fecal Coliform | #/100 mL | 50.00 | 49.77 | 0.16 | 7.96 |
| pH | pH | 7.35 | 93.28 | 0.11 | 10.26 |
| Total Phosphate | mg PO4/L | 2.36 | 21.77 | 0.10 | 2.18 |
| Nitrates | mg NO3/L | 6.30 | 27.99 | 0.10 | 2.80 |
| Turbidity | NTU | 8.70 | 76.56 | 0.08 | 6.12 |
| Total Solids | mg/l | 301.00 | 57.42 | 0.07 | 4.02 |
| Totals (factors, total) | 0.79 | 49.54 | |||
| Adjusted WQI | 62.71 | ||||
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.