Drawdown
Groundwater Mining on Black Mesa
| Table 2 Data on Black Mesa Wells | ||||||||
| Well ID | Surface Elevationa (feet msl) |
N-Aquifer Top Elevationb (feet amsl) |
N-Aquifer Thicknessc (feet) |
Water Leveld (feet bgs) |
Water Surface Elevation (feet amsl) |
Water Level Declinee (feet) |
Remaining Water Level above N-Aquifer (feet) |
Potentiometric Surface Reduction % |
| BM2(8T-538) | 5,650 | 5,198 | 1100 | 200.2 | 5,449.8 | 75.2 | 251.8 | 23% |
| BM3(8T-500) | 5,735 | 5,580 | 800 | 153.9 | 5,581.1 | 93.9 | 1.1 | 99% |
| BM5(4T-519) | 5,858 | 4,338 | 780 | 400.8 | 5,457.2 | 77 | 1,119.2 | 6% |
| BM6 | 6,340 | 4,390 | 950 | 829.3 | 5,510.7 | 93.7 | 1,120.7 | 8% |
| Forest Lake (4T-523) | 6,644 | 4,713 | 1100 | 1,166.5 | 5,477.5 | 70 | 764.5 | 8% |
| Howell Mesa (3K-511) | 5,860 | 4,900 | 1300 | 269.5 | 5,590.5 | 58 | 690.5 | 8% |
| Kayenta West (8T-541) | 5,885 | 5,600 | 700 | 284.8 | 5,600.2 | 58 | 0.2 | 100% |
| Keams Canyon (2) | 5,809 | 4,909 | 700 | 462.8 | 5,346.2 | 170.3 | 437.2 | 28% |
| Kykotsmovi (PM1) | 5,650 | 4,762 | 1050 | 214.2 | 5,435.8 | 6 | 673.8 | 1% |
| Pinon (PM6) | 6,397 | 4,507 | 700 | 862.8 | 5,534.2 | 119.2 | 1,027.2 | 10% |
| Rocky Ridge (PM2)f | 5,985 | 4,545 | 900 | 504.9 | 5,480.1 | 73 | 935.1 | 7% |
| Rough Rock (9Y-95) | 5,633 | 5,400 | 1000 | 255.2 | 5,377.8 | -1.4 | -22.2 | -6% |
| (10T-258) | 5,903 | 5,600 | 500 | 308.8 | 5,594.2 | 7.8 | -5.8 | 390% |
| (10R-111) | 5,757 | 5,550 | 400 | 191.0 | 5,566.0 | 21 | 16 | 57% |
| Sweetwater Mesa (8K-443) | 6,024 | 5,400 | 1450 | 539.6 | 5,484.4 | 10.2 | 84.4 | 11% |
| Notes a - Surface elevations as listed in Margot Truini, B.M. Baum, G.R. Littin, and Gayl Shingoitewa-Honaine, Ground-Water, Surface-Water, and Water-Chemistry Data, Black Mesa Area, Northeastern Arizona-1998 (2000) (USGS Open File Report 00-66), except for Howell Mesa (3K-511), which appears as listed in Geotrans, Inc., A Two-Dimensional, Finite-Difference Flow Model Simulating the Effects of Withdrawals to the N-Aquifer, Black Mesa Area, Arizona (December 1987) (prepared for the Peabody Coal Company). b - N-aquifer top elevations as calculated from data reported in Office of Surface Mining Reclamation and Enforcement Western Regional Coordinating Center, Report on Its Review and Analysis of Peabody Western Coal Company's 1998 "Annual Hydrological Data Report" and the U.S. Geological Survey's Ground-Water, Surface-Water, and Water-Chemistry Data, Black Mesa Area, Northeastern Arizona-1998 (Aug. 2000)-except for Howell Mesa (3K-511), Kayenta West (8T-541), Rough Rock (9Y-95), (10T-258), (10R-111), and Sweetwater Mesa (8K-443), which were estimated by approximating well locations on an N-aquifer thickness contour map published in Geotrans, Inc., A Two-Dimensional, Finite-Difference Flow Model. c - N-aquifer thicknesses as estimated by approximating well locations on an N-aquifer top elevation contour map published in Geotrans, Inc., A Two-Dimensional, Finite-Difference Flow Model. d - Water level measurements from 1998 as listed in Office of Surface Mining Reclamation and Enforcement Western Regional Coordinating Center, Report on Its Review and Analysis (2000), except for Howell Mesa and Rocky Ridge, which are based upon the 1996 data listed in the Office of Surface Mining Reclamation and Enforcement Western Regional Coordinating Center's 1998 report. e - Change in water levels since prestress period, circa 1968. f - Water levels at Rocky Ridge trended steadily downwards until 1997, when there was a reported increase of 146.5 feet followed by a decrease of 33.2 feet in 1998. 1996 data are shown. bgs = below ground surface amsl = above mean sea level | ||||||||