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TABLE 31 TWENTYMILE COAL COMPANY PERIOD OF RECORD WATER QUALITY DATA v 0 SITE: AVF15 (WELL AVM-15, FISH CREEK ALLUVIUM) DATUM = 6628.4 CATEGORY ................. PARAMETER ................. ............................. ANALYSIS TYPE .. UNITS ....::_ ...... :.: OCT . ....._.... NOV FEB MAY AUG OCT MAR JUN FIELD PARAMETERS : DATE - ............................ . ....................... ... 10/13/02 '.•: ........................... 11/12/02: ... . ...>.. 2/6/03 ..... ...... 5/12/03 ..... 8/9/03 __ 10/16/03 /31/04 /16/04 ...................................... ......... :WATER ELEVATION ........................................... .... -----...........-----............... FT ABOVE MSL ....... .............. 6621.2; . ...................... 6621.18' ...............> 6622.35; 6623.62; 6621.5:; 6621.6> 6623.58% 6623.42: . .. : <WATER LEVEL FT 7.24; 7.22: 6.05 4.78; 6.9? 6.8 4.82; 4.W :. :.............. ; . : :PHYSICAL PROPERTIES :TEMPERATURE :.........:.... _ FIELD ::.... .. ;DEGREES C : ; :::. 11.7, : _. 9 4; 4.6 : : 6.5 : .. ... 13.0.: > 11.9., 6.3.; 8.9 ............................................. . CONDUCTIVITY ........................................... FIELD .. ........---.......................... ; -UMHOS/CM ............ ....... .. 700` ........... ....... : ... . .. 520:: ............... 590 :.. ...---............ 573; .................. ;. 655 .......... .......: . 726: ........... ......... . 624 ....................... 583% :LAB ............................ ........:; UMHOS/CM ..........--.--.------... ....................... -- 370; -....... ......... 620: ;... ........... ..... 800 ..................... - ...:. PH :::.: - FIELD PH 8.13 >:: ... 8.65 :......:..:.;.:: 8..'3.2; .:....... 7.74i' ... TW . 7.53 7.84::: :: 7.70: :LAB PH 844; _.., 8.36; .: 7.68 ............................ ........ ..................... ............. :TOTAL DISS .................. ................... ....... MG/L ..... .................... 300 380: 520.. ............ .. ....................... .... ................. :CATIONS :CALCIUM : :........................................ :DISSOLVED ..... ............................ MG/L 43 58> - .... --•------.... 200; , :. .:.:..::::.:.:....::...:::..:................ ;MAGNESIUM ...:ISS .......... D OLVED . MG/L 8> 38.: :....-..._....... 77 . ...... ............. ---- - ........... ;SODIUM :DISSOLVED MG/L 37. . 43 : 51, .............................. ......................... .. ":ANIONS ....... ............................... ........... :;BICARBONATE . ........................................ AS HC03 .......................................... MG/L ......................... ................... .. : ...... 40W ................ . ..... 340` ..................... ...... 480; ..................... .................. .................. -.............................................. CARBONATE ......... .......................... ....... AS C03 .......................................... MG/L ................. .......... .. .... <V ...................... ..... ................ < 1 sSULFATE NOT APPLICABLE MG/L _... - .:::: 63 .......: ..:.:..75 ..:. ...... - .:: . 15W ...:.:.:........... ?PRIMARY CADMIUM ;DISSOLVED UG/L < 5 . <5' - < 5 % -- ----------- -- - .............. ;LEAD .......................................... :DISSOLVED .... ................................. ..... UG/L .......................... ............ ....... ... < 50 ................. < 50 .................. .......................... .............. .-• < 50 ---............... .................. ............ • MERCURY ............................... :DISSOLVED .........................---........ [UG/L ...... < 0.2 ........ < 0.2 ......................... .. < 0.2. ..... SELENIUM :DISSOLVED ;UG/L ---- - ----- ------ ------- --- ---- - --- - <2,. - ------ ;SECONDARY IRON .................. ............................. :DISSOLVED .. .................................... ... UG/L ..... ..................... ............. - .. .. ... <5- ........................... <5# .................... .................. 3600 ;MANGANESE ;DISSOLVED . UG/L . 37 130; 4100: ::...................................... ............. ....... TRACE METALS ............................. ................... :MOLYBDENUM .......................................... 'DISSOLVED . .... ................................... `UG/L ........................ ; . ..................... ;.... < 50 .......--. :. < 50 . .............. ........... ........................ < 50% ...... ............. .................. ...........----- NUTRIENTS ;NITROGEN ;ANI IIA-FREE >MG/L < 0.05 < 0.06 % > 1.3 : NITRATE ::.. : _... MG/L :... 0.03% < 0.02` .. :. .: < 0.02, .......... .............................. NTTRITE .... ..................................... MG/L ......................... ............................ < 0.02- ................: < 0.02; .................. ..............: < 0.02; .............--... .................. ........................................ N03+NO2 ..... .................................... G/L ...... ; .... 0.03 . < 0.02; ; .. 0.02` ;PHOSPHATE :ORTHO-DISS MG/L 0.01 .02`:. - < 0.01; ............... NOTE: Well area flooded by subsidence in late 2004. Permanent ponding in area after september 2004. See next downstream allivial well (008-AU3) for water quality data. EXCEL: G:\EnviromnentaPCDMG - CDRMS\AHR\2008\Tab1es\New Alluvial Well 2009.xls