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I • 2.05.6 <br />The flooded mine workings could also affect the ground water quality and <br />quantity in the overlying Upper and Lower Perched Water Zones. However, <br />as stated above, the Mesaverde Formation transmits little water. Therefore, <br />the impact the flooded mine workings will have on the quantity and quality of <br />the surrounding strata should be minor. <br />The Rollins sandstone, as monitored in DH-34B, NM4X98-29 and P-TC-03- <br />01(R) has pH in the range of 7.5 to 9.6, conductivity in the 1,200 to 7,900 <br />umhos/cm range and total recoverable iron in the 0.2 to 62.0 mg/I range. <br />The Rollins sandstone is a confined aquifer under piezometric head. The <br />confining shale layers and piezometric head should prevent any integration <br />of water from either the D-Seam or B-Seam into the Rollins sandstone. <br />The perched water below the D-Seam and above the B-Seam is or was <br />• monitored by drill holes D-58a and DH-67-D-Blw. The quality of water in this <br />perched water being zone, as reported in the 2002 AHR show pH in the <br />range of 8.1 to 11.6, conductivity in the 485 to 4600 umhos/cm range and <br />total recoverable iron in the 1.0 to 31.4 mg/I range. Based on the quality of <br />the mine water discussed above, mine water seepage into the perched water <br />below the D-Seam and above the B-Seam would improve the water quality in <br />the perched water bearing zones. <br />The perched water above the D-Seam is or was monitored by drill holes D- <br />58, 66 and DH-67-D-Abv. The quality of water in this perched water being <br />zone, as reported in the 2002 AHR show pH in the range of 8.1 to 13.5, <br />conductivity in the 652 to 5500 umhos/cm range and total recoverable iron in <br />the 0.1 to 17.7 mg/I range. Based on the quality of the mine water discussed <br />above, mine water seepage into the perched water above the D-Seam would <br />improve the water quality in the upper perched water bearing zone. <br />r 1 <br />U <br />PR-09 <br />2.05 -75ii o9/os <br />APPRav~ <br />~0~~2~oS <br />