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- ---- --- -ls- ~ VI. HvdroloQic Balance: Cround Water - Rule; 2.04.3. 2.04.7, 2.05.6 '__ i. nr I___t~1 Examples of the type of inflow report requested are on file at the Division office (see inflow reports for the U.S. Steel Socmerset Mine and Western Slope Carbon's Hawk's Nest Pline). An. alluvial ground water aquifer has been identified along East Salt Creek. Monitoring wells established in the alluvium :indicate that alluvial water levels fluctuate seasonally in response to flaw in East Salt Creek. Data collected by the applicant from the Salt Creek alluvial aquifer thus far indicate a carbonate-sulfate type water, simi:Lar to Che characteristics of the surface vater in the system as would be expected. No'significant adverse affects on ground water are anticipated for this operation. ,r Salt Creek Mining Company intends to nonitor this aquifer upstream and downstream of the mine to identify nay effect:a from mining. The Division therefore requires the following stipulation to verify it's conclusions: 5. THE PERL4ITTEE WILL CONTIATUE 1!fONITORP.:G WELLS G:1-1 AND GW-4 IN SALT CREEK ALLWIUM QIIARTERLY. AT THESE TIi~1E5 THE WATER LEVEL IN THE WELLS WILL BE MEASURED AND. SAMPLES WILL BF: TAY.EN FOR ANALYSIS OF _ - pH, TEMPERATURE AND SPECIFIC CONDUCTANCE. THE RESULTS OF THIS MONITORING WILL BE SUBMITTED TO THE DIVISION II~fEDIATELY AFTER DATA COLLECTION AND ANALYSIS. VII. Alluvial Valley Floors - Rules 2.06.8 and 4.24 Sufficient information was provided by the applicant to determine that East Salt Creek is an alluvial 'valley floor. Unconsolidated alluvial deposits have been identified which are extensive enough to qualify as alluvial valley floors. The existence of agricultural activities in the vicinity of the operation is evidence of the potential for irrigation. Alluvial Valley Floor Findings With Regard to Farming- Physical disturbances created by the operation which will directly impact the alluvial valley floor are road construction and a proposed sedimentation pond. The road construction attributable to t:he operation consists of widening of an existing ranch rand leading to the portal area. The sedimentation pond will be constructed at the mouth of McClane Canyon within the area mapped as unconsolidated alluvial deposits. As stated on page 4-4 (Volume 1) of the application, the total disturbance of the AVF related to the road expansion and construction of Che sediment pond is approximately one acre. The total areea of alluvial valley floor within a one-half mile radius of the confluence of PtcClane Canyon and East Salt Creek (as mapped by the applicant) is approximately 145 acres. Approximately seven-tenths of one percent of the AVF contained within this area will be affected by the surface disturbance related to the operation. ~-