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Manb 7003 2003 Anmm! Hydratogy ReDost ~ Paye 8 <br />fluctuations and well MW-23 has demonstrated steadily declining water levels since July of 1984. Well <br />MW-16, was dry at the end 2001 and has remained dry since. Water levels for Well MW-65 have <br />generall}~ remained stable, with minor fluctuations of ± Z O feet. <br />Historic water quality data for monitoring wells MW-1Q MW-16, MW-23, and MW-65 are <br />summarized in Tables 5, 6, 7, and 8, WaterQuality Data, MW-XX, respectively. Water quality samples <br />were not obtained fox Well MW-8, as described in the permit application. Review of historic water <br />quality monitoring data indicates spike values for several parameters and minor to moderate variances <br />in ground water quality over time. No discernable pattern of ground water degradation over time is <br />evident for any of the monitored wells. It is anticipated that ongoing monitoring will allow evaluation <br />of whether or not any of the observed variances in water quality represent long-term trends. <br />Measured water quality in all monitoring wells remains well below material damage thresholds and <br />indicates that no significant ground water impacts have occurred as a result of mining and related <br />activities. <br />3.1.2 Loadout Area <br />In the Loadout Area, ground water occurs primarily in alluvial/colluvial deposits in and adjacent to <br />the Oak Creek floodplain. Due to limited surface and ground water flows and recharge and the <br />character of the alluvial/colluvial deposits, these deposits do not appeaz to store or transmit <br />significant quantities of water, as indicated by the lack of sub-irrigation (refer to Section 2.04.7 of the <br />Southfield Mining and Reclamation Plan document for more details). Because the alluvial/colluvial <br />deposits associated with Oak Creek do not represent a significant ground water source or aquifer, <br />there is not ongoing ground water monitoring in the Loadout Area or immediate vicinity. <br />3.2 MONITORING WELL INSPECTIONS <br />Depth and general condition of monitoring wells are checked each time the wells axe monitored. <br />EFCI replaced several well caps in 2001/2002 to assure ongoing access control and prevent any <br />surface contamination. <br />TABLE 4 <br />MONITORING WELLS -WATER LEVELS <br />Date Monitor Wells (Depth to Water in Ft.l <br />Decimal Year MontfilYear MW-8 MW-10 MW-16 MW-23 MW-65 MW-NW <br /> Oct-79 -280.0 -128.0 -85.0 -130.0 - <br />1980.06 Jan-80 -261.4 -138.0 -87.0 -128.0 <br />1980.36 May-80 -244.0 -136.0 -72.0 -102.0 <br />7980.54 Jun-80 -212.0 -134.5 -75.0 -129.5 -- <br />1980.69 Sep-BO -240.0 -106.6 -87.5 -130.0 <br />1980.81 Oct-80 -240.0 -103.0 -89.0 -129.0 <br />1980.92 Dec-80 -231.0 -104.0 -84.0 -126.0 - <br />1980.98 Dec-80 -235.0 -104.0 -89.0 -129.0 <br />1981.13 Feb-81 -232.9 -134.0 -90.0 -130.3 <br />7981.26 Apr-81 -231 .0 -151.0 -90.8 -107.0 - - - <br />1981.44 May-61 -231.3 -145.0 -92.7 -101.8 <br />1981.57 Jul-81 -231 .5 -158.0 -95.0 -102.0 - - - <br />1981.63 Aug-81 -231.5 -161.0 -94.0 -102.0 <br />-- <br />1981.71 Sep-81 -231.7 -164.0 -99.0 -102.4 <br />1987.93 Dec-81 -232.0 -167.7 -114.4 -703.4 --- <br />1982.07 Jan-82 -232.2 -167.6 -119.0 -99.1 - <br />t982.24 Mar-82 -232.4 -166.7 -121.0 -98.1 - <br />1982.96 Dec-82 -233.5 -127.0 -103.0 -92.5 - - <br />7983.30 Apr-83 -234.0 -108.0 -98.0 -94.0 - <br />PrIIVH * 7375 Pine Grove Road, Surle 709 * .Stramboat Sprragr, CO 80387 * (970J 879-6260 <br />u .~~i ntu.y n..ei ~»,yN.uim....npross~Wgnror n...,,i irrvr W, <br />u rsrnr m <br />