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r--- <br />rr r, , .. ~ .. s '~"+.. <br />ilia ~vti ~ ~ ~~° <br />V 4 'S <br />C~G~pp~~G3T~T+I® Gix~~m~~t~ pct©~v • ~ ~"~ ~~ <br />The elevations of section comer mazkers within the well field would be m _ ` '~; to <br />.zx,.~~ ~ :: , <br />benchmazk elevations once every 6 months during commercial operations. <br />This monitoring would maitily track subsidence at the surface, which would be a result of <br />subsurface subsidence. American Soda has committed to attempt to use Time Domain <br />Reflectometry (TDR), an electrical measurement technique used to determine spatial location <br />and nature of various objects, to monitor subsurface subsidence. In consultation with BLM, <br />American Soda would evaluate the feasibility of TDR during the experimental test mine <br />operations. If successfiil, the use of this technology would be added to the subsidence <br />monitoring program. If TDR does not prove to be an adequate means of motritoring subsidence, <br />the BLM will require that one morritonng well be established in each mine panel. A suite of <br />downhole geophysical logs would b~~ran in this hole on an annual basis, including baseline ok <br />before mining commences, to monitor subsurface subsidence. ~~ <br />2.2.5.3 Groundwater Quality and NNater Level Aonitoring ~'' ~ , <br />" A series of monitoring wells would be located in the well field to monitor groundwater quality r` ~aa.` `~,'0` • 7 <br />and water levels. Three experimental test phase monitoring wells aze currently motritored for test ~'t~;~ r~ <br />phase operations. These and seven other existing monitoring wells would be used to monitor the b~` ~Q, ~ ~j <br />~' initial 0-5 yeaz mitring panel. The locations of the monitoring wells relative to the 0-5-yeaz n e~"'U <br />mining panel aze indicated in Figure 2-10. Figure 2-11 shows a typical mottoring well section. i ~~,.~ ~ <br />;t, The results of groundwater monitoring for the first 5 yeazs of mining would be used to develop ~~~ '' y~ <br />an appropriate monitoring program for subsequent 5-yeaz mining panels. Additional monitoring f p 11'' ~~ <br />wells would be established at appropriate downgradient locations in conjunction with v"( ~~~ <br />development of each subsequent 5-yeaz mining panel. It is anticipated that each panel would dd" r^'~1 ,'~ <br />have at least one upgradient and one downgradient monitoring well. These monitoring wells ~ a r rM1, , s •4 <br />would likely monitor the Dissolution Surface because groundwater at this location is closest to 1 t ~1•"_~ ~ g <br />the solution mining interval (approximately 150 feet). Specific well locations and target P,P <br />monitoring horizons for each well would be determined in consultation with the BLM, CDMG, ,~„='~^` -r ~ <br />and EPA. The monitoring wells would be in place and coI[ecting baseline data 6 months prior to tT,°,,~ (`r, r^ <br />~'' commencing mining activities in a panel ~ ra' , , - v <br />,• <br />Monitoring of water quality and water level in bedrock aquifer wells at the Piceance Site would ;, ~'y•' <br />M, occur on a montlily basis. Montlily monitoring well samples would be analyzed for a minimum <br />of the following constituents: ~,~ _. ~ <br />mac, o H i (~L M ~~ P~~P c~,i.'a ray <br />-i?! o conduc[iviry ,~ it 1 ~°°'~ ~°~,'~ s .~S ~ ~Sa.` ~~ ° <br />~~, ar SC Tree C•n s+;f..ln ,~ <br />o total dissolved solids ~.rrti ~,~N ~; <br />o alkalinity !Jd <br />HcOJ <br />#~ o sodium bicazbonate ~l <br />o sodium cazbonate <br />~,. o fluoride <br />2-21 <br />