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The 3000 to 4000 mg/I TDS is an increase from about 600 mg/1 TDS that existed in the <br />unmined Wadge at the locations of the pits. <br />4. Of CYCC's four Wadge monitoring wells, two show no impacts from the leachate, one <br />well shows moderate impacts, and one well shows TDS concentrations almost as high <br />as the leachate but is also degraded by pre-SMCRA leachate. <br />A comparison of ambient TDS levels as of January 31, 1994 with recent TDS levels <br />indicates CYCC complies with the Basic Standards for Ground Water at all four points <br />of compliance (the Wadge monitoring wells) (see Table 6 below). <br />Table 6 -Comparison of TDS data from Wadge overburden monitoring <br />wells: Ambient levels as of 1/31/94 versus Recent data <br /> TDS (mg/I) <br />Well Representative Recent average TDS, <br /> existing ambient 1998 -2001 <br /> TDS, as of 1/31/9) <br />94M002/026-79-6 893 661 <br />94MOOl/026-79-4 776 7l1 <br />009-79-4 1428 887 <br />006-82-74C 3310 1975 <br />6. Water level data from the four Wadge monitoring wells indicate the potentiometric <br />surface of the Wadge overburden aquifer has recovered to near premining levels. <br />Recovery to near premining levels indicates CYCC has protected the ground water <br />recharge capacity. <br />Recovered recharge capacity, compliance with the Basic Standards for Ground Water, <br />and recent TDS levels below the use-suitablility level for livestock watering of 5,000 <br />mg/I, indicate CYCC has not caused material damage to the ground water hydrologic <br />balance outside the permit azea. <br />The pastureland post-mining land use in the permit area has not been impaired by the <br />changes to the ground water hydrologic balance caused by CYCC. The changes were the <br />minimum that can be expected from a surface mining operation. <br />9. Ground water pollution currently being caused by CYCC's mining operation, if any, <br />should continue at [he current level because CYCC's spoil leachate quality appears to <br />have reached long-term stability with TDS concentrations of around 4,000 mg/1. This <br />quality can be expected to continue for several hundred yeazs, as predicted for the nearby <br />Seneca II Mine (USGS Water-Resources Investigations Report 92-4187). <br />Mine 1 and the Eckman Park Mine Page 1 1 January 3, 2002 <br />Phase III Bond Release <br />