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' Require- <br /> Require- ment <br />Requirement ment complied Comment <br /> citation with ? (yes <br /> / no) <br />Q. Para- <br />meters Table <br />to be 2.04.7-1 <br />analyze of CDMG <br />d in mining yes <br />ground permit C- <br />water 81-008 <br />samples <br /> The Burro Canyon Formation, approximately 60 feet beneath <br /> the mined sequence, may be the only aquifer that has been or <br /> will be a drilling target for local water supply wells, although an <br /> update of the PHC is needed to verify this. The Burro Canyon <br /> Formation is not believed to be in,hydraulic commumication <br /> with the mined sequence, and therefore is not expected to be <br /> affected by mining. <br /> Prior to mining, naturally high concentrations of sodium and <br /> sulfate render the water from the mining stra[igraphic sequence <br />R. Basic CWQCC unusable for domestic or irrigation purposes. The water is <br />Standards regulation marginally usable for livestock watering; spoil leachate will <br />for Ground s yes probably be no less usable. <br />Water 41.4 and Downgradient monitoring wells indicate curtent compliance <br /> 41.5 with the Basic Standards for New Horizon #2 if compliance <br /> points were established at the well locations. These wells are <br /> GW-N13 through 18. <br /> New Horizon # I does not have a downgradien[ monitoring <br /> well (other than in the coal sequence), but well GW-N27 <br /> monitors spoil leachate. The leachate is better quality than <br /> premining ground water quality (due, probably, [o dilution from <br /> irrigation water). Consequently, the Basic Standards are <br /> complied with at New Horizon # I if a compliance point were <br /> established at the GW-N27 well location. <br />S. Restoration Mine pit excavations disrupt [he potentiometric surface. After <br />of ground reclamation, the pits will show full recovery of the <br />water CDMG potentiometric surface outside the pits and partial recovery of <br />recharge to regulation yeS potentiometric surface inside backfilled pits. Spoil springs may <br />a <br />roximate 4 <br />05 <br />1 I (3) reduce ground water recharge by diverting ground water flow to <br />pp . <br />. surface flow, but New Horizon's expected total aggregate spoil <br />premining <br />spring discharge of less than I cfs will be too small to reduce <br />rate ground water recharge below approximate premining rate. <br />T. Prevention of <br />adverse <br />impacts to CDMG The PHC predicts no adverse impacts, and monitoring data <br />ground water regulation yes indicate no adverse impacts, but the PHC needs updating as <br />systems 4.05.1 I explained in Comment 2 of the attached letter. <br />outside the <br />permit area <br />Paee 3 <br />