2010-08-02_REVISION - M1977300 (25)

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Environmental Protection Plan, Schwartzwalder Mine 11-8 The period of record extends from approximately 1973 to the present22. The data set contains dissolved and total uranium and radium, as well as field parameters (temperature, pH, conductivity, and dissolved oxygen.) A longer suite of parameters was analyzed approximately annually at each station. In addition to the routine historical monitoring described above, an intensive water quality study was conducted from 1998-1999 as part of the mine closure hydrology evaluation conducted by the Operator and Adrian Brown Consultants. Water quality in Ralston Creek was measured approximately monthly at 10 stations, which are listed in order from downstream to upstream in Table 11-5(b). The analytical suite included constituents for which drinking water Maximum Contaminant Levels (MCLs) and Colorado instream water quality standards existed at the time. Table 11-5. Surface Water Monitoring Stations (a) Long-term Monitoring Stations and Non-Routine Sampling Stations in Ralston Creek STATION NORTHING EASTING ' ELEVATION DESCRIPTION FREQUENCY NAME SW-LLHG 726,873.63 2,065,661.22 6358.0 Long Lake Head Gate Monthly SW-ARH 729,590.23 2,064,210.64 6358.0 Above Red Hill Variable SW-FBRG .......... .................................................................... 731,700.86 ..... ........................................................................ 2,063,819.07 ..................................................................... 6460.0 .......................................... .................................. First Bride ....................... ........................ ........ ...................................................................... Variable .... ........... _..._..... ..... ... .... ...... ........ .... . .. . . . SW-BPL .......... ................................................................... 732,105.23 ..... ....................................................................... 2,063,068.76 ...................................................................... 6509.0 ......................................... .................................. Below Property Line . . . . . ..... ..... .. . . . .. . . .. . . .. ..... Month l SW-DIS001 .......... 733,406.0 2,061,299.0 : 6585.0 .. . ....... ....._. .. ... ....... .... Discharge Month SW-A001 .......... ................................................................... 733,650.46 ..... ............................. -....................................... . 2,061,153.05 ..................................................................... 6590.57 .......................................... .................................. Above Dischar e Pt A001 ............................ ............................................_ ................................................... l Month ..........................................Y............_.... ............... SW-AWD 734,870.0 2,059,850.0 : 6639.9 Above Waste Dum P . Variable ............................................................................. SW-Abv PI .....:....................................................................... ........................................................ ..................... ............................................._.._..........._.......... ..........._.. ............. :..... .......................................................................................... ...._......_................. Above Plant Site .................................................... ._................... ........... ................................................................................... Variable .. . D-MENA ......................................................... .................... 735,830.0 ......................................................_..........._..._..._ 2,056,360.0 ............... ....... ........... ........... ........... .............. 6790.0 _.......... .......................... ...... .................................. . Downstream of Mena _.............. ........ . ..... ... .. . ................................... .. Variable SHFTMENA ............ ................................................................. 735,960.0 ..... ........... ...................................... .............. ......_ 2,055,850.0 ............................................................. 6835.0 .......................................... .......... . . . . ... ......... Mena Shaft Variable U-MENA 735,940.0 2,055,380.0 : 6815.0 Upstream of Mena Variable Note: Coordinates in NAD 27. Stations listed in order from downstream to upstream. (b) Local and Long-term Surface Water Monitoring Stations Monitored from 1998-1999 and from June 2010 to present STATION NORTHING EASTING ELEVATION ;DESCRIPTION SW-LLHG .................................................................... 726..873.63 ............................._.......................................... 2,065,661.22 _..................................................................... 6155.00 .................................................................... long Lake Head Gate (1.5 miles downstream) ......_.................................................... . SW-BPL .................................... _.... _........................ 732,105.23 . .......................................................................... 2,063,068.76 _........................... .................................... ...... 6508.97 ...... ........................................ ..................... !Below ProPe Line ...... .......... _............ __................... .....?'........................... near MW8 ........................................_. ( ) SW-GS 732,466.73 2,062,546.19 6533.43 Guard Shack (near MW7) ....... ........................ SW-BOS ............................................................... ...... . 732 696.77 .:. .......................................................... 2 307.12 ?................062_, : .................................... _ : 6543.60 ... .................................................................... ........................................................................................ :Below Ore Sorter ......................................................................................................... ....................................... ... (near MW6).. .._..__................................................................................................. SW-OS 732 902.10 .......................................... 2,062,102.41 :...................... ....... . .. . : 6551.92 Ore Sorter (u stream from Sum 3) .. SW-PL 733_,088.71 ............. . . .. 2,061,744.42 .... ....................... ...................................................................... 6563.94 .................................................................... ;Parkin Lot ......................................1?..............................................._............. . ........................................................................................... (near MW3A). ............................................................................................................_ SW-BDIS ..................._.................. 733 336.16 ,..........................._............................................ 2 061..476.31 .........._?................_.................................... : 6577.34 .................................................................... Below Dischar e . .............. ......................................................................._._ ......... .................... ..................................................................................... . . ... SW-A001 ................ 733,650.46 .............................._ 2,061,153.05 ..................................................................... 6590.57 ................. Above Dischar a (u stream of culvert) SW-UC 734,328.15 2,060,300.99 ......................._..........._............................. _ 6618.08 ...................._..._. .. . U er Culvert P . (uPstream of culvert) SW-UP 735,102.33 2,059,153.21 . . _. 6660.82 _.. .._......................................................................... Upstream 01,200 ..........................................................................................._...._......... ' E of prop. Boundary) " The surface water quality data evaluated for this report ranges from 1998 (or 1990 for uranium) to January 2009. 23 Elevation is approximate (within 1 ft) for station SW-130S 4109C.100731 Whetstone Associates