Table 1.
Simulated Mitigation Strategy Comparison with No Actiona
| source | population | no action mean | SD | 1 μg/L threshold mean | SD | fractional difference of means | t-statistic | p-value |
|---|---|---|---|---|---|---|---|---|
| Human Exposure (mg/kg/day) | ||||||||
| GW | total | 2.44 × 10−6 | 1.23 × 10−5 | 1.76 × 10−6 | 1.12 × 10−5 | 0.28 | −45.49 | <0.001 |
| MX | total | 2.84 × 10−6 | 6.64 × 10−6 | 2.16 × 10−6 | 4.45 × 10−6 | 0.24 | −32.08 | |
| SW | total | 8.71 × 10−7 | 4.99 × 10−6 | 1.93 × 10−7 | 1.03 × 10−6 | 0.78 | −70.85 | |
| GW | products only | 7.54 × 10−7 | 4.46 × 10−6 | 1.19 × 10−7 | 4.46 × 10−7 | 0.84 | −66.63 | |
| MX | products only | 7.36 × 10−7 | 4.96 × 10−6 | 1.13 × 10−7 | 4.55 × 10−7 | 0.85 | −57.37 | |
| SW | products only | 8.05 × 10−7 | 4.97 × 10−6 | 1.27 × 10−7 | 5.82 × 10−7 | 0.84 | −73.82 | |
| GW | both | 9.23 × 10−6 | 2.50 × 10−5 | 8.38 × 10−6 | 2.40 × 10−5 | 0.09 | −5.66 | |
| MX | both | 6.15 × 10−6 | 7.55 × 10−6 | 5.39 × 10−6 | 5.80 × 10−6 | 0.12 | −8.31 | |
| SW | both | 3.94 × 10−6 | 5.25 × 10−6 | 3.27 × 10−6 | 5.02 × 10−6 | 0.17 | −2.98 | 0.002 |
| DTD mass released (g/day) | ||||||||
| GW | total | 1.56 × 10−3 | 1.98 × 10−3 | 2.51 × 10−4 | 2.97 × 10−4 | 0.84 | −57.67 | <0.001 |
| MX | total | 1.57 × 10−3 | 1.97 × 10−3 | 2.60 × 10−4 | 2.43 × 10−4 | 0.83 | −58.85 | |
| SW | total | 1.53 × 10−3 | 1.96 × 10−3 | 2.24 × 10−4 | 2.29 × 10−4 | 0.85 | −56.22 | |
| GW | products only | 1.42 × 10−3 | 1.86 × 10−3 | 2.08 × 10−4 | 2.12 × 10−4 | 0.85 | −50.80 | |
| MX | products only | 1.34 × 10−3 | 1.81 × 10−3 | 1.97 × 10−4 | 2.04 × 10−4 | 0.85 | −43.40 | |
| SW | products only | 1.51 × 10−3 | 1.93 × 10−3 | 2.20 × 10−4 | 2.25 × 10−4 | 0.85 | −55.49 | |
| GW | both | 2.09 × 10−3 | 2.34 × 10−3 | 4.27 × 10−4 | 4.73 × 10−4 | 0.80 | −37.07 | |
| MX | both | 1.92 × 10−3 | 2.14 × 10−3 | 3.60 × 10−4 | 2.64 × 10−4 | 0.81 | −58.68 | |
| SW | both | 2.56 × 10−3 | 2.92 × 10−3 | 4.05 × 10−4 | 3.34 × 10−4 | 0.84 | −11.93 | |
a
Comparison of human exposure and mass released DTD between a scenario in which a 1 mg/L upper limit on product concentrations (concproducts) is imposed versus a no-action scenario.
Shown are means for human exposure (mg/kg/day), mass released DTD (g/day), and the percentage reduction of exposure and mass released DTD between the no-action and 1 mg/L threshold scenarios.