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<br /> <br />grotu~ter monitoring r~niirements should be totally reevaluated. <br />DH-70Z: ~i-70 is located adjacent to Fast Mine workings which were mined in 1984. <br />Water quality samples have not been obtainable fran this location since <br />1986 and none were obtained in 1992. Monitoring at this location should <br />be t®~orarily discontinued until such time as the Fast mine bemires <br />active again. Water levels appear to have stabilized at this location and <br />continued monthly maac~,ramant is not warranted. <br />GR-77': GR-77 is located cutside the zone of potential subsidence impacts. Water <br />quality samples and water levels have not been obtainable at this location <br />since 1987. 'This well has two perforated itttervals (140' - 240' and <br />440' - 480') but the associated lithology is uNoiown. The well apparently <br />was plugged in 1987. Volume 10 of the permit docimient suggests that water <br />level maa~+~*p~nts at this site are suspect and may be the result of <br />filling up the drill hole for electrical-geophysical logging. Volume 10 <br />indicates the initial static water level at this well was 506' below <br />ground. The water level has since been mea_~+~red at arourri 110' to 120' . <br />There is currently pronounced organic decatg~osition of something taking <br />place in this well and further monitoring should be abandoned until and <br />unless the well can be rehabilitated. <br />SW-6: No water quality samples were obtained from SW-06 during 1992. No retreat <br />mining has occurred within this watershed to date. A sufficient water <br />quality database exists to characterize pre-mining water quality at this <br />site. Flow measurements fr~n April 28 (22.6 cfs) and June 2 (3.4 cfs~ <br />were omitted from the database. Monitoring at this site should continue <br />as currently required. This site should have been monitored more <br />intensively but was last in the shuffle of trying to adhere to the rest <br />monitoring program. No water quality samples were obtained. <br />SW-9': SW-9 is located outside the area of any potential mining impacts. SW-9 <br />was relocated on the Overlarri Ditch in the NI;; SF}; Section 5, T13S, R92W. <br />Zhis site measures irrigation water which is turned out of the Overland <br />Ditch and which does not pass through the mine permit area. Further <br />monitoring of this site should be discontinued. <br />SW-11': SW-11 monitors flows in Roatcap CYeek below SW-6 after flows from Fast aryl <br />West Roatcap Creeks converge. Further monitoring of this site should be <br />discontinued. No additional information regarrlirg flows from the permit <br />area can be obtained frwn SW-11 that is not provided by SW-06. <br />UII2C': Monitoring of UII2C originated frcan concerns of the Division during <br />construction of the West Mine facilities (see CMCRD inspection dated 11- <br />25-86; item 16). CWI agreed to weekly monitoring of TSS and TDS at this <br />site. Subsequently, the Division allowed a reduction in the frequency of <br />monitoring to once per month (see Ci+1LRD inspection dated 01-15-87; item <br />3). Monthly sampling has been conducted ever since. Vegetation has <br />beowne firmly established on the disturbed slopes in the seven years since <br />this sampling was initiated. Recent samples shwa no wnsistent pattern of <br />difference between ilII2C aryl LII2C. This monitoring should be discontinued <br />as the wncerns which prompted the monitoring, namely sediment transport <br />15 <br />