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Boulder Creek at 75th St |
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Boulder Creek at 75th St |
For August, 2002 the WQI rating at Boulder Creek at 75th St (BC-75) was Bad (D) due to a WQI value of 43.49.
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 | 148.40 | 50.00 | 0.17 | 8.50 |
| Fecal Coliform | #/100 mL | 3500.00 | 12.40 | 0.16 | 1.98 |
| pH | pH | 7.12 | 90.00 | 0.11 | 9.90 |
| Total Phosphate | mg PO4/L | 1.02 | 36.61 | 0.10 | 3.66 |
| Nitrates | mg NO3/L | 6.00 | 29.29 | 0.10 | 2.93 |
| Turbidity | NTU | Data Unavailable | |||
| Total Solids | mg/l | 315.00 | 55.81 | 0.07 | 3.91 |
| Totals (factors, total) | 0.71 | 30.88 | |||
| Adjusted WQI | 43.49 | ||||
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.