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Schwartzwalder Mine -Hydrologic Evaluation of Mine Closure and Reclamation 91 <br />7. GROUNDWATER QUALITY <br />Groundwater quality data are available from 9 monitoring wells in alluvium, 4 sumps in alluvium, 2 <br />monitoring wells in bedrock, 21 sampling sites in the underground mine prior to flooding, and from a range <br />of depths in the underground #3 shaft during mine flooding. Monitoring locations and the number of <br />samples collected18 from each station for the closure hydrology study are summarized in Table 27. <br />Table 27. Location and Frequency of Groundwater Quality Samples <br />Compiled and Evaluated for the Mine Closure Hydrology Study <br /> <br />Alluvial Wells <br />Descri lion Number Of <br />Sam les <br />Comments <br />MW00 <br />MWO <br />MW 1 <br />MW2 <br />MW3A <br />MW4 <br />MWS <br />MWSR <br />MW6 <br />MW7 <br />MW8 <br />MW9 Alluvium, upgradient of mining activities <br />Alluvium, below southeast toe of waste rock pile <br />Alluvium, northwest of treated water discharge pond <br />Alluvium, downgradient of treatment plant <br />Alluvium, southeast of former untreated water storage pond <br />Alluvium, southern corner of former untreated water storage pond <br />Alluvium near former ore and waste containment bins <br />Alluvium near former ore and waste containment bins <br />Alluvium down gradient of mine and office/shop <br />Alluvium near former ore sorter <br />Alluvium, downgradient of former mining facilities <br />Alluvium near former ore and waste containment bins 56 <br />53 <br />58 <br />50 <br />6 <br />6 <br />0 <br />8 <br />62 <br />63 <br />0 <br />46 Constructed in 1999 <br /> <br />Poorly installed, high turbidity <br />Influenced by Ralston Creek <br />Usually dry prior to 2003 <br />Little water, often dry <br />Out of service since 1999 <br />Replacement well for MWOS <br /> <br /> <br />Dry <br />Used as um in well for multi-da test. <br />Sum s <br /># I Sum Southeast of Guard Shack, near former core stora a buildin 84 Went online Au ust 1990 <br />#2 Sum 190 feet southeast of former ore sorter, inside flood control wall 39 Went online A ril 1990 <br />#3 Sum 65 feet southeast of former ore sorter 40 Went online Janu 1992 <br />#4 Sum Midwa between former ore sorter and emer enc stora a and 85 Went online October 1990 <br />Bedrock Wells <br />MW 10 Com leted in mica schist southwest of mine workin s 0 data uali im aired b oor com letion <br />MW 11 Com leted in mica schist southwest of mine workin s 10 Dee bedrock well <br />Mine Water Collected Unde round Durin O erations <br />MINN Minnesota level, near Glo Hole 1 U er workin s Minnesota Level <br />Wash Steve level: see s from Washin ton chutes 1 U er workin s Steve Level <br />CO Steve level: Colorado drift bulkhead 1 U er workin s Steve Level <br />ILLRS Steve level: see s from boazds in Illinois raise 1 U er workin s Steve Level <br />146 Steve level: and behind air re ulator 1 U er workin s Steve Level <br />2Adit Pool behind berm 1 Ad acent workin s Steve elevation) <br />2A Rt headin in decline, below intersection 1 Ad acent workin s Steve elevation <br />700ILL Fracture alon Illinois Fault 6 700 Level <br />779 Pool com osite sam le from ool 5 700 Level <br />7J2 Corehole, intermittent flow dri flow flow 2 700 Level <br />1108 Bulkhead com osite 5 1100 Level <br />15B Bulkhead com osite 1 1500 Level <br />1 SB 13 Corehole at drill station 15B 4 1500 Level <br />16G Corehole flowin throu muck Fe t 5 1600 Level <br />1730 Le ner hole 5 1700 Level <br />19D15 Fe Corehole at drill station 19D, Fe stainin 5 1900 Level <br />19D16(Mn Corehole at drill station 19D, Mn stainin 5 1900 Level <br />19C 16 Corehole at drill station 16C 4 1900 Level <br />JOS2026 Sto a water Johnson Ore Shoot 5 2000 Level <br />1955 Decline Standin water 4 1955 Level <br />Mine Water Collected Under round After O erations <br />Steve Adit Steve level: see s from boards in Illinois raise 1 U er workin s Steve Level <br />Mine Water Collected in Shaft Durin Refloodin <br /># 3 & #2 shaft Samples collected from the reflooded mine workin s 114 various de the and levels <br />~$ The table reports the only number of samples collected and evaluated for the mine closure hydrology study. <br />4109B.071 116 Whetstone Associates <br />