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• for water levels since January of 1981. Three additional spoil wells (GW-N26, GW-N27 and GW- <br />N28) and one replacement coal well (GW-N4R) were installed in August and September, 1987. <br />Measurements for static water levels began at these wells immediately after they were completed <br />and developed. <br />In order to obtain specific baseline water level information at New Horizon 2 a total of 22 monitor <br />wells were drilled and completed. In June of 1986,16 monitorwells (GW-N13, GW-N14, GW-N15, <br />GW-N16, GW-N16P1, GW-N17, GW-N17P1, GW-N18, GW-N18P1, GW-N19, GW-N20, GW-N21, <br />GW-N22, GW-N23, GW-N24 and GW-N25)were installed. DuringAugustand Septemberof 1987, <br />six additional monitor wells were installed, (GW-N29, GW-N30, GW-N31, GW-N32, GW-N33 <br />and GW-N34). Measurements for static water levels began at these wells immediately after they <br />were completed and developed. All of the water level data are presented in tabular and graphic <br />form in Appendix D of Attachment 2.04.7-5 Hydrological Monitoring Plan. Five more wells (GW- <br />N36, GW-N37, GW-N38, GW-N39 and GW-N40) were added in May 1993. The first three wells <br />were drilled in the north-east corner of the permit area. The last two wells were drilled along the <br />Calamity Draw. <br />• <br />During November 1998, six (6) newground water monitoring holeswere installed to collect baseline <br />data. Three of these (GW-N41, GW-N42, and GW-N43) were located in an up dip area while the <br />other three (GW-N44, GW-N45 and GW-N46) were located in a down dip area of the revised <br />permit area. The three holes at each site will monitor overburden, coal zone, and underburden <br />respectively. Baseline data collected between October 1988 and September 1999 are given in <br />Attachment 2.04.7-2. During March 1999, two underburden monitoring holes, GW-N13 and GW- <br />N19were plugged and abandoned. <br />Alluvial Water Levels. One alluvial monitor well (GW-N22) was installed at New Horizon 2 to <br />monitor the unconfined alluvial aquifer system along Calamity Draw. Static water level <br />measurements were taken at this site since July, 1986. There is approximately 23 feet of <br />unconsolidated material (alluvium) with an average saturated thickness of 15.24 feet at this site. <br />During the 1987 water year the maximum seasonal water level fluctuation for this monitor well was <br />about 3.6 feet, ranging from 5.62 to 9.22 feet below ground surface. Shallowing occurs at this well <br />from April through Septemberwhen the irrigation ditches are flowing and irrigation of the local fields <br />• <br />REVISED JULY 2006 2.04.7-7 <br />