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• wel I. Well completion summaries and lithologic logs for the monitor wells are contained in Appendix <br />15-2. <br />WFC's Minor Revision No. 15 and 21, along with Technical Revision No. 24 modified the ground <br />water monitoring program. In the NH1 mining area, G1/1FN1P1, GV~FN4R were dropped from the <br />monitoring list because they were close to GW-N1 and GW-N4 and duplicate information that was <br />being gathered. G1Ii~N5,GII~FN6,andG1/~N23weredroppedfromthelistbecausetheyweremined <br />out. In NH2 mining area, GW-N16P1, GV~FN17P1, G4~N18P1 were dropped from the list because _ <br />they were dose to G1/m~N16, GI/mEN17, and G1/~FN18. GV~N31, G1/~N32, G1/~N33 were <br />discontinued because they were either south of Calamity Draw or way west of NH2 mining area. <br />G1/mFN30 and G1/tFN34 has been mined through. GII~N22 well can not be found so it was dropped <br />from the list as well. Presently, there are 12 monitoring wells at NH1 and 14 at NH2 being <br />monitored. Appendix 15-1 list the current wells that are being monitored at NH1 and NH2. <br />Well Completion and Developrrent <br />There areten monitorwells (GV1r! N1, GI/m~N1 P1, GV~N3, GW-N4, G1/~N5, GI/1r-N6, G1/~N8, G1/mEN9, <br />• GW-N10, and GW-N11) within and adjacent to the Nucla Mine that were installed in 1977 and 1979. <br />The completion information on the ten original Nuda wells lacks specific completion details. Monitor <br />Well GV~N5 was mined out in 1987. In the summer of 1986, nine new monitor wells (GW-N13 <br />through G1ImFN21) were completed in the NH2 Mining area to help define the baseline conditions of <br />that area. Also, three multiple completion (overburden, coal, and underburden) monitor wells (GW- <br />N23, GV1FN24, and GV1FN25) were installed at what is called the scraper pit area of the Nucla Mine. <br />All three of the scraper pit area monitor wells have been dry since they wire installed. In August <br />and September 1987, four additional monitor wells were completed at the Nuda Mine; three in the <br />spoil material (GI/i~N26, GW-N27 and GV~N28) and one in the Dakota coal (GW-N4R). In addition <br />to the four monitor wells installed at Nuda Mine, six exploration bore holes (GV~N29 through GW- <br />N34) were completed as monitor wells in the vidnity of the NH2 area. In 1994, GW-N36 through <br />GW-N40 were drilled in NH2 area. <br />For quality control, each monitor well is developed and evaluated before it is incorporated into the <br />long term monitoring program. The first stage of development entails air lifting imrrmediately after the <br />well is drilled and completed. Drill pipe is lowered inside the casing of a four-inch well (1 1/4-inch <br />steel pipe in a 2-inch well) and then air is injected into the well fordng water, sediment, and <br />• (Revised 1231-96) 15-$ <br />