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Temporary Substitute Supply Plan -Line Camp. Montezuma County. SEP 2004, Page 14 C Water Consumption 1. Water w,ll be consumed during the operation of the Line Camp Pit as a result of evaporation from exposed water surface areas removal velh the mined and processed product evaporation dunng washing operations, and evapora'~ian irom water used to dust control purposes. Once the Pit has been reclaimed, water will be consumed by evaporation from pond surfaces. 2. Water Consumed Cv Nel Prt Evaxration Dunng mining operations, ground water will cotiect and lbw either to a pond ,connected ;o the ground water; or :o a Cewater ng sump at the southeast corner o(the pit and well then either gravi;yAow or be Irtted and Flow via a drainage pipe wh,ch dsrnarges directly to the Dolores R!ver Sediment (rom erosion and m~n~rg activ:Les wit! setfle in the sump icr water treatment ~n accordance with CDPHE +vatar discharge permit conditions prior ro Ernv and discharge into the drainage pipe and river. The total water surface area ~s ~desufec in the History of operations (paragraph A 3.1, and s summarizetl m the labies below Far p!ann~ng purposes. anticipated future exposeC water is based on a'worst•case' assumption (irom the po nt of water evapra! cn'~ t^.a! !here w, l be no detvalering. I! min,ng rate ~s changed ar when dev2tenrg is imp,emen;ed the water s..race area ~.v.f ce •educeC Significantly tluong min ng Figure 6. Water Surface (Planned and Executed) Water Year Punned water surface (SF) Actual water surface S Water surface w!dewaterin 01 •G2 31400 SF 10.72 acres 30.000 0.69 Not a licable OCT 02 02.03 46.2L~ SF 11.06 acres 104,1 CU 2.39 Not a Iicable OCT 03 0.9-04 69.300 SF 2 05 acres t 12.800 2.59 Nat a licable JUN 04 04.05 05•G6 191,000 SF (».38 acres 371.000 SF 8.52 acres _ i BD TBD _ 06.07 483.000 SF 11.09 acres Est 350.000 8.03 07.08 . 483.000 SF t 1.09 acres Nola IicaDle Final nd surface Calculations of evaporation are based on the largest area of water exposed during a calendar month For example, the water surface ~s shown as : 38 acres for April 06.6.52 for May O6. and 8.52 for June O6. but in practice, the min~rtg would exparA the water surface over a 50•day period in htay a^d June irom 4,38 to 6.52 to 8.52 a;,res, resorting ~n an average of 5.45 acres icr May and T 52 in June, out ;he larger area is used for calCUlaticns. Ir. the same way, U+e first two winters, the actua; area of exposed vrdter surface has shrunk ;Example: April 04 was t.$. down from 2.35 acres measured in November and used for the venter: then expanded (as waver levels rose) ;0 216 in t+1ay sad 2 59 .n June), but it is assumed fur future catcuatgrs that there is no reduction of the water surface in ~Jte mnntert:me Dewatenr g by gravely or pump had been panned to reduce open water and ;c minimize evaporation Dewatenng to a depth of appraximate;y ' 2 feet belaw the pre•mining grcurtd surface at :he southeast wmer of the pa can be dome via gravity `low, Cewatenng below that level well requL•e pumping However, the generaay very !ow level of the ground water (due to the drought) has made this unnecessary arA graw;y oe+vatering almost impossible. Dewalenng by pumping was also no; nestled, because of the availability o(water from dry•up to replace evaporates water, as well as changes m tecnroques o1 mining, Water irom dewatenng well return to the aver via a pipe. If tlewaterng a used Curing operating periods the cNy water surface area exposed will be the 0.86 acres of the original sump. However. for planning purposes. it is assumed m caiculat:ons that there well be no dewatenng during operations.