Ternary Mixing Model Results
| Sample Name | Number of Acceptable Models | Mean Age of Young Fraction (years) | Dispersion Parameter of Young Fraction | Fraction of Young Water (%) | Fraction of Native Intermediate (%) | Fraction of Deep Water (%) | Total Relative Error (%) | Total Fraction of Intermediate Water (%) | Excess Proportion of Old gw Stored in Intermediate Zsone1 (%) | Modeled Arsenic (µg/L)2 |
|---|---|---|---|---|---|---|---|---|---|---|
| June 2007 | 1816 | 20.9 | 0.05 | 10 | 51 | 39 | 0.52 | 61 | 4 | 12.0 |
| DD, WH | 795 | 20.9 | 0.03 | 3.2 | 23 | 74 | 0.09 | 26 | 39 | 18.3 |
| November 2008 | 1664 | 20.1 | 0.02 | 6.4 | 30 | 64 | 0.12 | 36 | 29 | 16.5 |
| 09TS4 (May 2009) | 2036 | 20.9 | 0.05 | 11.4 | 40 | 49 | 1.60 | 51 | 14 | 13.8 |
Note: All model results assume an unsaturated zone travel time of 15 years, an intermediate and deep mean age of 6500 and 21,120 years, respectively, and 0.01 was used for the intermediate and deep model dispersion parameter values.
a
Table 1Assumes water entering well at intermediate depths comprises 65% of total flow to well (based on flow log).
b
Table 2Estimated by mixing 23 and 5 µg/L (value from adjacent monitoring well) of old and intermediate gw.