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Boulder Creek at 75th St |
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Boulder Creek at 75th St |
For July, 2002 the WQI rating at Boulder Creek at 75th St (BC-75) was Medium (C) due to a WQI value of 59.38.
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 | 116.30 | 93.48 | 0.17 | 15.89 |
| Fecal Coliform | #/100 mL | 330.00 | 27.19 | 0.16 | 4.35 |
| pH | pH | 7.29 | 92.62 | 0.11 | 10.19 |
| Total Phosphate | mg PO4/L | 1.37 | 30.00 | 0.10 | 3.00 |
| Nitrates | mg NO3/L | 5.10 | 33.50 | 0.10 | 3.35 |
| Turbidity | NTU | 12.00 | 70.00 | 0.08 | 5.60 |
| Total Solids | mg/l | 246.00 | 64.68 | 0.07 | 4.53 |
| Totals (factors, total) | 0.79 | 46.91 | |||
| Adjusted WQI | 59.38 | ||||
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.