Laserfiche WebLink
Wolf Creek Reserve Groundwater Investigation Work Plan <br />March 6, 2014 <br />about 125 feet above the Wadge Seam. Alluvial deposits in the area, primarily along Fish Creek and <br />Foidel Creek but also along Trout Creek downstream of the permit area, are generally less than about <br />20 feet thick and are discontinuous. <br />The Twentymile Park Basin is an enclosed ground water basin, rimmed by outcrops of the major <br />lithologic units. Groundwater recharge to all bedrock units is by infiltration of precipitation and runoff in <br />outcrop areas, primarily on the southern and western margins of the basin. The synclinal structure with <br />outcrops on the margins of the Twentymile Park Basin results in confined conditions away from the <br />outcrop areas. Groundwater flow is controlled by lithology and geologic structure and is generally <br />downdip toward the synclinal axis from the southern and northern basin margins. Overall movement of <br />groundwater through the area is generally toward the north. Previous studies (Robson and Stewart <br />1990) studies indicate that the lower members of the Williams Fork Formation (including the Wadge <br />and Wolf Creek Coal Seams and Wadge/Wolf Creek Interburden) function as a single hydrologic unit in <br />this area. The conclusions from these previous studies are further supported by recent radio - isotope <br />analysis of groundwater in the area, indicating that the groundwater is over one - million years old, and <br />further, that there is little or no groundwater movement or mixing in the lower portion of the formation. <br />GROUNDWATER MONITORING PROGRAM <br />Hydrologic monitoring was initiated by CYCC in 1979 and continues to the present. The current <br />monitoring program is conducted under permit revision documents TR03 -42 and PR03 -06, which <br />specify the locations, frequency and type of monitoring required. Table 1 summarizes the groundwater <br />monitoring program for bedrock units; monitoring locations are shown on Figure 1. The remainder of <br />this section briefly reviews the monitoring results. Detailed descriptions of the monitoring and results, <br />including water level hydrographs and water quality summaries, are provided in Annual Hydrology <br />Reports (AHRs) submitted to DRMS. <br />Table 1. Summary of Bedrock Groundwater Monitoring Program. <br />Site <br />Water I:eyel`an Fi` 1d'P ixieters <br />ark.. .. ' ` ". <br />to < <br />..:: < ". °Va `':' <br />l'tYyl?larlg'. <br />w ,, <br />FrQqusiY <br />Pefiol ;of°i2ecorsi,`;' <br />Viregiieicy <br />":Period of Record <br />Wadge Overburden <br />009 -79-4 <br />Semi - annually <br />1981 -2013 <br />Annual <br />1981-2013 <br />006- 82 -74C <br />Semi - annually <br />1982-2013 <br />Annual <br />1982-2013 <br />91 M006 <br />Semi - annually <br />1991-2013 <br />Annual <br />1991-2013 <br />008 -77 -58 <br />Semi - annually <br />1979-2013 <br />Annual <br />1979-2013 <br />93 -M001 <br />Semi - annually <br />1994-2013 <br />Annual <br />1994-2013 <br />Twentymile Sandstone <br />006 -BRDH7 <br />Semi - annually <br />1987-2013 <br />Semi- aonly) ly (field <br />1987-2013 <br />91 M005 <br />Deactivated <br />1997-2002 <br />Deactivated <br />1997-2002 <br />97012TM <br />Deactivated <br />1997-2002 <br />Deactivated <br />1997-2002 <br />97013TM <br />Semi - annually <br />1998-2013 <br />Annual <br />1998-2013 <br />FBR -11 B <br />Abandoned <br />1996-2002 <br />Abandoned <br />1996-2002 <br />FBR -2 <br />Semi - annually <br />1995 —2013 <br />Annual <br />1995 —2013 <br />Trout Creek Sandstone <br />001 -83 -106 <br />Annual <br />1986 —2013 <br />Bi- annual <br />1986 —2013 <br />001 -83 -107 <br />Annual <br />1986 —2013 <br />Annual <br />1986 —2002 <br />008- 75 -EFC <br />Deactivated <br />2002 <br />Deactivated <br />2002 <br />TETRA TECH <br />