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02-16-1995 08~24RM FROM ~RBODY WESTERN <br />TO 913038328106 P.04 <br />• <br />All but fro of the subirrigeted areas identified are associated ri th retlands that are not <br />formable. I~ One area upgradiant from Pond 10 in 56, TSr, R87Y was identified on both <br />Exhi bf is 10-1 and 16-3 (Figure 2) as improved pasture, subirrigeted. Exhibit 10-1 more <br />i specif icaLly defines the extent of the field because it ras evaluated as part of a higher <br />order regetetion survey chat included detailed sampling. This ras not the level of <br />mapping analysis requiretl in the AYF survey. Regardless, both surveys [dentified a <br />i subirrigeted field in Section 8. The AVF report in Attachment 16.3 reports there ere no <br />subirrigeted fields in Armand Drar fn crop production. This statement is correct ae the <br />22-aers field in question has long since been abandoned, is not bat ng managed, and has <br />been aignif ieantly reinvaded with perennial native cpociec. SC[ provided the AVF <br />consultant rith alluvial rater quality dace measured in Section 8 (see Table 7-22, Tab 7). <br />The rater quality data shors the CDOX irri gaci on stands rda for pH and nn aro exceeded and <br />the alluvial rater in this portion of Armand Drar is unsuitable for AVF farming- Based <br />largely on the rater quality aed the fact the field has been abandoned (not en <br />etonomicslly feasible field to farm and not of aignif ieenee to farming in the area), the <br />AYF Study cone[uded there ere no existing subirrigeted areee presently in crop production <br />and no potentially subirrigeted fields in Annend Drar. <br />i In the second area, twelve acres out of a 2000-acre dryland farmed field were identified <br />~ ae potentially subirrigable. A worst case salinity inenasa analysis was performed for <br />! she 12-sere parcel and potential yield declines ~of from 3.9 percent to 5.9 percent ware <br />calculated. Considering the 12-acre parcel with the other 1,988 scree of non-irrigable <br />~ cropland in the tame field, the overall crop reduction is less than 1 percent. <br />Literature Cited <br />Rahn, P.X. 1976. Put ential of Coal Strip Mine Spoils as Aquifere In the Porder River <br />Baein: Project ro. 10670025, Old Yest Regional Commission, Billings, NT, 108 p. <br />YanYOeat, Y.A. and R.S. Xedges. 1975. Hydropeolog ie Aspects of Exietf ng end Proposed <br />Str(p Coal Mines Near Decker, Sout heasiern Montana. Montana Bureau of Mines end <br />Geology Bulletin 97. 31 p. <br />13 <br />TOTRL P.04 <br />