Laserfiche WebLink
Ground water monitoring wells are located in both the Rapid <br /> Creek and Cottonwood Creek basins . GWMS 02a and 021b are <br /> upstream on Cottonwood Creek, GWMS 03a and 03b are upstream on <br /> Rapid Creek, while GWMS Ola and Olb are downstream on Rapid <br /> Creek downstream from the confluence with Cottonwood Creek) . <br /> These wells have been placed to monitor surface subsidence <br /> impacts on creek flows in the southern permit area; therefore, <br /> water level is the only parameter measured . Surface flow was <br /> measured monthly from January 1986 through December 1987 when <br /> the mine went into temporary cessation status with Division <br /> approval . Since 1988, the well data on the above mentioned <br /> wells has been taken quarterly. <br /> Seven piezometers are monitored for water levels on a quarterly <br /> basis (four on Coal Refuse Disposal Area No. 1 (CRDA No. 1 ) and <br /> three on CRDA No. 2) . <br /> Recently, the Division has reviewed Powderhorn' s monitoring <br /> program and requested several changes . These changes have been <br /> accepted by the operator and will be instituted into 1993 <br /> Annual Hydrology Report. The two prominent changes effecting <br /> ground water are: <br /> a. One of the alluvial wells at the loadout site will be <br /> reactivated and tested for full suite parameters annually. <br /> The loadout well sites were discontinued in October of 1987 <br /> with Division approval , due to the mines ' temporary <br /> cessation status . <br /> b. All water from mine operations that is pumped through the <br /> mine workings before being discharged at the surface is to <br /> be tested annually for a full suite analysis . This water <br /> was first tested in 1992 according to the full suite <br /> analysis as depicted in Table 2 .05.66. <br /> 2 . The permittee will conduct monitoring of surface water in a <br /> manner approved by the Division. The monitoring plan was <br /> submitted under 2.05.6(3)(b)( iv) (4.05. 13(2) ) . Surface water <br /> monitoring locations are shown on Exhibit 56 in the permit. <br /> Surface water monitoring will include sediment pond discharge, <br /> mine water discharge , Cottonwood Creek flow, and Rapid Creek <br /> flow. <br /> Sediment pond discharge will be monitored only when pond <br /> dewatering occurs in accordance with NPDES requirements . <br /> Parameters analyzed for are listed in Table 2 .05. 6A and consist <br /> of total suspended solids , total dissolved solids , oil and <br /> grease , pH , and iron. <br /> Mine water discharge volume is measured by flow meters at NPDES <br /> discharge points 001 , 002 , and 004. Water quality of the mine <br /> discharge water will be tested annually for parameters listed <br /> in Table 2.05.66. Field parameters consisting of pH , <br /> conductivity, and temperature will be taken quarterly with flow <br /> -22- <br />