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Well <br />Elev. <br />Aquifer <br />Location <br />FPW <br />4780 <br />Ennis Draw <br />Mine <br />DH96 <br />4764 <br />Ennis Draw <br />Downstream from Mine <br />DH122 <br />4814 <br />Ennis Draw <br />Upstream from Mine <br />SMW -2 <br />4803 <br />Reclaimed Spoil <br />Mine <br />AMW -1 <br />4804 <br />Undisturbed Overburden <br />Downstream of B Pit <br />AMW -2 <br />4811 <br />Reclaimed Spoil <br />Downstream of A Pit <br />There is currently no surface water monitoring at the Keenesburg Mine Site, because there is no <br />point of surface water discharge. On December 18, 1989, Technical Revision 23 approved the <br />deactivation of the Colorado Discharge Permit System (CDPS) permit, and the Department of <br />Health (former name of CDPHE) concurred with this decision. Permit COG - 850038 was later <br />reinstated with an expiration date of June 30, 1997. CEC again proposed, and CDPHE approved, <br />the expiration of the CDPS permit without renewal (the CDPHE letter regarding the Request for <br />Inactivation of this permit can be found in Division files). <br />The Division proposes to continue the approved exemption of certain small disturbed areas <br />(topsand storage and reference area sites) from the requirement to have runoff from the small <br />areas report to sediment ponds. This is because of the limited size of the areas, and that ponds <br />and treatment facilities are not necessary for drainage to meet the effluent limitations of Rule <br />4.05.2 and applicable State and Federal water quality standards for receiving streams. Mixing of <br />the surface drainage from these areas with a discharge from underground workings will not <br />occur. The small areas to be exempted are described in the Index Maps and Legal Description <br />sections of the Permit [Rule 4.05.2(3)(b)(i)]. <br />Ground Water Monitoring Plan <br />The following ground water monitoring plan is required by Rule; 4.05.13(1). <br />Monitoring Wells <br />The table below summarizes well information. Elevations are top of casing elevations. <br />Well sampling and water levels of subsurface water are taken from Wells SMW -2, AMW -1, <br />FPW, DH96 and DH122. Wells are sampled quarterly. <br />The sampling parameters are: <br />• Calcium - dissolved <br />15 <br />