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Mr. Kent A. Gorham <br />August 24, 1993 <br />Page 3 <br />fr'can each station to date. Zlris trend has been evident since the <br />inception of data collection efforts (see attached data sheets) at <br />stations SM-7, SM-5, SM-6, SM-10, aryl SM-11 (listed in order from <br />upstream to downstream). <br />A potential explanation for this phencenenon could be that EC varies <br />somewhat with each site's relative location within the watershed. <br />As shallow groundwater moves through the watershed to the point of <br />extraction or sampling, the potential for dissolved constituents to <br />aocimnrlate in the water increases as a flux..-lion of the contact time <br />aryl/or distance the water travels through the substrata. Water <br />extracked from sites located progressively ftuher frmn the point of <br />origin, or >n this case from the watershed boundary, could <br />reasonably be expec.-ted to exhibit higher dissolved solids <br />concentrations which would be manifested in higher EC readings. SM- <br />7 is located at the base of a small Qac deposit (refer to Maps No. <br />2-2 aryl 4-1) which is in turn situated near the top of the Fast <br />Roatcap Creek watershed boundary. Stations SM-5 and SM-6 are <br />located in the vicinity of a similar deposit but the contributing <br />watershed area above these locations is larger relative to SM-7. <br />Stations SM-10 and SM-11 are located still further do~.mstream and <br />are not installed near a Qac deposit. Ztre roadcut >n the vicinity <br />of SM-10 and SM-il exposes interbedded shale aryl coal stringers in <br />the vicinity of these wells and the marked increase in DC values at <br />these stations relative to 5, 6, aryl 7 is likely more influenced by <br />this local geology. <br />Mine Inflow Report <br />No response required. <br />Annual Subsidence Report <br />OOVCC looks forward to discussing the Division's concerns with regard to <br />the 1993 monument survey stations at your earliest wnvenience. <br />Zhank you for your cooperation in this matter. If you have any questions or <br />require further information, please contact me at 303-527-4135. <br />CYPRUS ORCFIAI2D VALLEY OPAL OORPORATION <br />xarl C. Koehler <br />Environmental Specialist <br />/kck <br />Enclosures (3) <br />cc: Mr. Steve S. 5huey, CDMG <br />CIF7G General Corresporrlelroe file <br />