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January 23,2002 <br />• Page 4 of 4 Pages <br />The report is in compliance with this rule with the permitted exception that water quality data was <br />submitted by calendar year in-lieu-of water year (Permit, page 4.05-11). Water quality data is <br />required for surface flows at the New Upper Goodspring Creek, Lower Goodspring Creek, and <br />Lower Taylor Creek surface water monitoring sites. Water quality data is submitted in Discharge <br />Monitoring Reports (DMR) of the sedimentation ponds. This information is submitted to the <br />Division as copies of the DMRs at the same frequency as they are submitted to the Colorado <br />Department of Public Health and Environment (quarterly). They are included in the AHR by <br />reference. The Division reviews these reports upon receipt. Water quality data is also required for <br />the three monitoring wells (Gossazd, North Goodspring, and A6 Wells). <br />Rule 4.05.14(4)(c)(iii): If required by the Division, a written interpretation of the data and <br />identification of mining related impacts to the hydrologic balance. <br />The report is in compliance with this rule. The Division required no written interpretation of the <br />data, but summary statements are made in the report that data suggests there is no impact from <br />Colowyo mining operations on the quantity or quality of surface or groundwater. <br />The probably hydrologic impact (PHC) from mining activities [Permit, page 2.05-75; Rule 2.05.6(2)] <br />_ is that "Surface water will no[ be significantly impacted in the mine area". The PHC continues <br />(Permit, page 2.05-75) "In summary, the Colowyo Mine will not significantly affect the hydrologic <br />balance or water quality of the general area or the permit azea and [he affect to the hydrologic balance <br />within the permit area will be insignificant. Temporary increases in TDS and associated common <br />ions are expected to affect quality in backfilled spoils within the permit area." From information <br />available at this time, this review concludes that the impacts on water quality and quantity from <br />mining activities as the Colowyo Coal Mine are within the grobable hydrologic consequences as <br />perntted. <br />CC: Dan Hernandez <br />File:C:\W PDOCS\Colovryo\alirrvw00.doc <br />• <br />