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2.05 AFPLICATICN F(R PFI2MIT FCR 8LktFACE OR @IDIItG~0@ID ?~~ A4`PIVITIFS - <br />MIlII?QIl4 RHQfTIAIIgSlPB FOR C~FItPiTICN ArID RDCLAMIITICN PLAPS. <br />• 2.05.6 Mitigation of Surface Coal Mining oparatio~n IIIQacts. (COnt'd.) <br />(3) (b) (iii) (Cont'd.) <br />of monthly water level measurements in drill holes 58, 60, 65, 69, 70, <br />arri GR-77. <br />Water quality samples were monitored for field parameters monthly and <br />lab analysis quarterly. The data obtained and conclusions from the <br />interpretation were submitted to the Division in the "Annual Hycrology <br />and Subsidence Reports". <br />One federally-cxined drill hole, GR-77, was included in the grourrlwater <br />monitoring network. This drill hole was completed by the U.S.G.S. in <br />1977 in the central part of the Fast Roatcap ('reek drainage. This well <br />monitors the perched aquifer in the sandstone strata above the mine <br />coal seam. The possibility of oomtmuLication between this perched <br />aquifer and the shallower alluvial/colluvial deposits overlying it <br />exists. Water level in this well fluctuates between 123 and 133 feet <br />frwn the ground surface and water quality is typical for shallow <br />aquifers. This hole was monitored for depth amt samples. <br />DH-58, located in the SFr NW; Sec. 18, T135, R91W, of the 6th P.M., was <br />drilled to a total depth of 1963 feet. This monitoring well, which has <br />remained dry, was also monitored as part of the subsidence monitoring <br />network. <br />DH-60 was drilled to a total depth of 1350 feet. 'This monitoring well <br />is located in the NF}; NF}, Sec. 14, T135, R92W, of the 6th P.M.. <br />DH-65 is located in the NW; NFr Sec. 15, T13S, R92W, of the 6th P.M.. <br />The total depth of this well is 1655 feet. <br />DH-69 is located in the NFr NW; Sec. 7, T13S., R91W, of the 6th P.M. <br />This monitoring well is drilled to a total depth of 1975 feet. <br />DH-70, located in the NW; SW; Sec. 17, T13S, R91W, of the 6th P.M. , was <br />drilled to a total depth of 692 feet. The initial water level was <br />measured at 534 ft. DH-70 was also irani.tored as part of the subsidence <br />monitoring network. DH-70 was monitored for quality and depth. <br />See Volume 4, Map No. 4-1 for the locations of all deep bedrock <br />grow~dwrater monitoring wells, Tables 4-A and 4-B for well conq~letion <br />summaries, and Tables 7 aril 10 in Volume 10 for lithologies. Water <br />quality data was obtained during the drilling of these drill holes from <br />sane random sampling. F]iougll data was gathered to characterize to deep <br />bedrock water. <br />CWI identified a number of alluvial/colluvial deposits as described in <br />2.04.7 (11. Only a few of the smallest deposits were scheduled to be <br />. undermined during the initial permit term. To gather further <br />information on the deposits, CWI constructed additional shallow <br />4R 93-24 Revised 12/10/93 <br />121 <br />