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• Nater Suitability, Tab 7 of the Nucla PAP presents discussions of the suitability of both ground end surface water monitored in the vit inity of the Nuela Mine end the Nucla East mining area. The suitability of both ground and surface water was assessed using the most stringent recommended standards published by various agencies for domestic drinking water, agriculture or irrigation, end livestock drinking water. In summary, the quality of water in all aquifers monitored in both areas was found to be unsuitable for both drinking water end agricultural uses. The overburden (NUCIa Nine), underburden (Nucta Mine and Nucla East mining area), spoils aquifer (NUCIa Mine), and alluvial aquifers (Nucla Eest mining area) were determined to be chemically suitable for livestock drinking water, although they were also deemed only marginally suitable due to their relatively low yields, Regarding surface water, all water monitored at both the N ucla Nine and Nuela East mining area was found to be chemically unsuitable for domestic drinking water end agriculture (irrigation). Surface water monitored et sites located in and tributary [o CeLamity and Tuttle Draws, and a[ NPDES sites (NPDES 001 and 006), were deemed auiteble for livestock drinking water. Spring water quality was also found to be chemically suitable for livestock drinking water only. • using the list of paremet ers end assotiat ed limits for livestock drinking water (see Tab 7, Nucla PAP), a review of chemical analyses performed on samples Collected at monitoring wells (see Appendix E) end et surface water sites (see Appendix L) was made in order to determine whether those water sources found in the Nucla PAP to be suitable for Livestock drinking water remained suitable during the 1990 water year. Based on the review, the overburden (NUCIa Mine), underburden (NUCIa Mine and Nucla Eest mining area), spoils (Nuela Mine), and alluvial aquifers (NUCIa East) were found to be chemically auiteble for livestock drinking water during the 1990 water year. Also, the revieN determined that water sampled et the Nucle Mine spring sites during the 1990 water year remained chemically suitable for livestock drinking water. Regarding analyses performed on samples collected at surface water sites during the 1990 water year, wate r in Calamity end Tuttle Draws and associated tributaries, as we ll es water sampled et NPDES 001 end 006 remained suitable for livestock drinking water, with the exception of [he April 14, 1990 sample obtained et NPDES 001. Analysis for total . recoverable lead performed on this sample resulted in a value of 130 ug/l, which is 30 mg/l higher then the livestock drinking water limit re commended for this parameter (100 19