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Boulder Creek at 75th St |
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Boulder Creek at 75th St |
For September, 2002 the WQI rating at Boulder Creek at 75th St (BC-75) was Bad (D) due to a WQI value of 49.54.
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 | 131.20 | 84.23 | 0.17 | 14.32 |
| Fecal Coliform | #/100 mL | 9400.00 | 7.47 | 0.16 | 1.20 |
| pH | pH | 6.91 | 84.43 | 0.11 | 9.29 |
| Total Phosphate | mg PO4/L | 1.84 | 25.00 | 0.10 | 2.50 |
| Nitrates | mg NO3/L | 7.40 | 22.98 | 0.10 | 2.30 |
| Turbidity | NTU | 13.00 | 68.36 | 0.08 | 5.47 |
| Total Solids | mg/l | 297.00 | 58.06 | 0.07 | 4.06 |
| Totals (factors, total) | 0.79 | 39.13 | |||
| Adjusted WQI | 49.54 | ||||
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.