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2.04.7 HYDROLOGY DESCRIPTION <br />(11 Ground Water Information <br />(a) The only significant ground <br />to the permit area is located in the lower <br />the Burro Canyon Formation. Based on the <br />tics in the area and depth of this aquifer, <br />that the aquifer will be effected by any mi <br />the permit area. <br />water in and adjacent <br />sandstone sequence of <br />geologic characteris- <br />it is highly unlikely <br />Wing operations within <br />(i) Based on drilling logs and monitoring data <br />from three (31 bedrock wells completed in the aquifer (BW-1, BW- <br />2, BW-31, and five (5) springs which discharge at the Burro <br />Canyon-Morrison contact, (SP-1, SP-2, SP-3, SP-4, SP-5), all <br />located within or adjacent to the permit area, the depth to the <br />potentiometric surface lies between 100 and 120 feet throughout <br />the permit area. The aquifer lies between 90 and 100 feet below <br />the last mineable coal seam. The physical locations of the <br />bedrock caells, springs and the outcrop of the aquifer are shown <br />on the Hydrologic Area Map, Drawing No. 110. <br />(ii) This aquifer is approximately 'LO feet thick <br />and extensive horizontally within the permit area. It is bound <br />from below by the impermeable, 400 feet thick, Morrison shales <br />and above by lenticular mudstones and shales within the Burro <br />Canyon Formation. Analysis of drilling logs indicate several <br />strata of impermeable shales between the aquifer and the lowest <br />• coal seam to be mined, totaling approximately 20 feet in thick- <br />ness. This impervious stratum will eliminate any effects on the <br />aquifer from the mining operation, even with the remote chance <br />that the potentiometric surface somehow rises to an elevation <br />above that of the lowest coal seam to be mined. <br />(iii) The three bedrock wells have been pumped by <br />the applicant. BW-1 has consistently yielded 2 to 3 gpm. BW-2, <br />which is located within the permit area, 3'ielded an immeasurably <br />small amount of water and is presently not being pumped by the <br />applicant. BW-3 has yielded a steady 1/2 gpm since it's comple- <br />tion. Results of the water quality monitoring data from the <br />bedrock aquifer is shown in Exhibit 3. <br />• 2.04-1'L <br />