Table 2. Water Quality Impacts of Well Pad Spudding.
d ≤ 0.5 km | d ≤ 1 km | d ≤ 1.5 km | d ≤ 2 km | |
---|---|---|---|---|
Panel A. By distance to well pad | ||||
Pads in “d” km | 0.0269 (0.0106) | 0.0149 (0.00863) | 0.000516 (0.00655) | 0.00492 (0.00584) |
Pads in 10 km | −0.000187 (0.000248) | −0.000313 (0.000287) | −0.000111 (0.000259) | −0.000366 (0.000319) |
Observations | 54,809 | 54,809 | 54,809 | 54,809 |
Panel B. By elevation to intake | ||||
Downhill pads in “d” km | 0.00202 (0.0227) | −0.00643 (0.00895) | −0.000847 (0.00560) | |
Uphill pads in “d” km | 0.0264 (0.0104) | 0.0155 (0.00803) | 0.00163 (0.00710) | 0.00648 (0.00739) |
Notes: Each column is a separate regression. Observations = 54,809 for each of the weight regressions reported. For panel B, pads up- and down-hill within 10 km are included but not shown. Robust standard errors in parentheses are clustered at the CWS level. The dependent variable is log(SGD chemicals).