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• Alluvium. Well 6A2 displays a LaMg-HC03 type water with an average TDS values in 1991 of <br />833 mg/l. This is higher than the 611 mg/t baseline average, but falls within the <br />baseline range of 454 to 900 mg/l. This well exists in the Hubberson Gulch alluvium <br />upstream of mine discharges. Irrigation of the pasture surrounding this well began May 6, <br />1989. All samples from this well collected after that date have had a higher TDS value <br />than samples collected prior to that date. <br />WeIL 7A2, located in the Hubberson Gulch alluvium downstream of mine discharges, displays <br />a CaMg-HC03SO4 type water with an average TDS value in 1991 of 1,229 mg/l. This is higher <br />than the 1041 mg/t baseline average, but falls within the baseline range of 760 to 1,346 <br />mg/L. TDS values have been trending upward since 1987, most likely a result of the lower <br />than normal spring runoff during the last five years. <br />Nell 19A, located in the alluvium of a Hubberson Gulch tributary (006 Gulch) that contains <br />mine discharges from the NPDES 006 pond, displays a MgLa-S04 type water with an average <br />TDS value in 1991 of 2,048 mg/l. This is lower than Che 2,158 mg/l baseline average, but <br />falls within the baseline range of 1,508 to 2,394 mg/l. <br />• Well 9A1, located in the Watering Trough Gulch alluvium upstream of mine discharges, <br />displays a CaMg-HC03 type water with an average TDS value in 1991 of 490 mg/l. This is <br />higher then the 489 mg/l baseline average, but fells within the baseline range of 404 to <br />566 mg/l. <br />Wadge Overburden. WeIL 140V, located in the proposed north mining area at which no mining <br />has yet occurred, displays a M9Ca-S04 type water with an average TDS value in 7947 of <br />3,414 mg/l. This value is both lower than the baseline average (3,513 mg/l) end the <br />baseline range of 3,464 to 3,562 mg/l. <br />WeLI 150V, also located in the proposed north mining area, displays a Na-504 type water <br />with an average TDS value in 1991 of 6,288 mg/l. This is higher both than the baseline <br />average (3,394 mg/l) and the baseline range (1,810 to 4,422 mg/I). Again, since no mining <br />has yet occurred in this area, this rise is a result of natural conditions. <br />Well 160V is located at the north end of the south mining area in which mining has begun <br />in 1990. Due to low casing volumes (1.9 gallons both in October, 1990 and July, 7997) and <br />• a low recovery rate, no samples were collected from this well. A July, 1988 hailing <br />5 <br />