Laserfiche WebLink
Tne Ciruela Canyon alluvium is underlain by the Baton rormation • <br />bedrock. This formation is a complex sequence of interoeduea sanastones, <br />siltstones, mudstones and carbonaceous shales xiti[ occasional coal seams. <br />As a result of low porosity, premeaoility and a large degree of <br />heterogenity, ~~ie unit has peen considered an aquacluaa. Occasional coal <br />seams are oelieved to be the predominant aquifers in :ne Raton rormation. <br />r:stimates of these hydrologic parameters of the Baton Formation nave been <br />well documented in previous application suomittals by CFacI Steel <br />Corporation. As noted aoove, the xaton Formation c..~crops souti[ and west <br />from themine reject pile and near Sediment Pond UU4. These exposures mark <br />respective poi~its of recharge and discharge of the Ciruela Canyon alluvium. <br />Another point of rech,roe is the Ciruela Canyon diversion, as this diversion <br />is excavated in uncunsoiidated colluvium at an ~.evation topographically <br />nigher than tae Ciruela Canyon alluvium. <br />The groundxater table in the Ciruela Canyon alluvium is shown in the <br />longitudinal profile of Section F-F'. This xater table is based on uata <br />from CFdcI studies, recently completed backhoe pits and xater level data . <br />fromthe allvuial monitoring well. CFBI Pits 1 to ~ and Pit A had water <br />levels consistent xith the oedrock alluvial material contact. Alluvial well <br />water levels taken during 1944 indicate the groundwater table xill remain at <br />a level 5 to 1U feet below the base of the present g^ound surface oecause <br />Ciruela Canyon alluvium saturation is topographically and geologically <br />limited oy the bedrock exposure (discharge point) near Sediment Ponu UU4. <br />Titus, the water table in Ciruela Canyon alluvium should not contact the <br />processing pile. <br />YHUCd55Idd WASTF; PI Lt; LAYUUT ll~SIGN AND DRAiNAGt; PLAN <br />waste pile plan viexs and crass sections are shown on Figure 1. 'Tne <br />drainage area surrounding this pile is ri.tij acres. Tne south ditch will <br />contain 4.yy acres of disturoed runoff. Tne north ditch will contain 4.U4 <br />acres of disturbed runoff. All draiange will report to Sediment Pond UU4A. <br />Tne 10 year 24 hour peaK flow es been calculated at 2U.1 cis for these <br />ditches. . <br />-4- <br />