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Janet Binns Page 4 April l5, 1999 regulations applicable are those under Regulation No. 41, The Basic Standards For Ground Water. Bedrock ground water in the vicinity of Mine No. 3 is classified as "Potentially Useable Quality" for the following reasons; a) TDS levels are less than 10,000 mg/I, b) Ground water is not used for domestic or agricultural uses, c) Background levels aze not adequate to assure compliance with the Human Health and Agricultural Standards, and d) Domestic or agricultural use of ground water can be reasonably expected in the future. The numeric standards which would apply are those which aze appropriate based on the factors listed for "Potentially Useable Quality". The Division finds that the appropriate standards would be found in Table 3, Agricultural Standards, and Table 4, TDS Water Quality Standards. Table 2, Secondary Drinking Water Standazds, were not considered for two reasons. First, sulfate exceeds the standard of 250 mg/1, with measured values in 1979 and 1993 of 439 and 530 mg/1 respectively. Secondly, use of bedrock ground water in the Twentymile Park basin is extremely limited due to inherent poor quality,.low yield, and availability of alluvial aquifers. Comparison of 1998 data to background levels (existing as of January 31, 1994) indicate TDS values have increased by a factor of 1.15, which meets the Table 4 standard of a maximum allowable increase of 1.25 times the background value. pH falls with the acceptable range of 6.5- 8.5. Primary metals such as lead, cadmium, mecury, and selenium, as well as nitrite, were not detected in the latest sampling. In conclusion, with regazd to Regulation No. 41, The Basic Standards For Ground Water, Mine No. 3 has met the appropriate standazd for ground water and has protected current and future uses of the ground water in the locale of the reclaimed mining operation. Spoil Water Quality Constituent 008-SP-SA 008-SP-4B Water elevation (M.S.L.) 6666 6672 Calcium (mg/t) 403 468