Laserfiche WebLink
from the raw material, since the gravel will be wet and no dust control is needed. Also, al] process- <br />ing is done at the River Bottom Pit. All consumptive uses are shown below: <br />Scenario 1- Durine Mining <br />2) Additional evaporation will occur as a result of mining the gravel and exposing it to air before it <br />is run through the cnxshing/screening operation and trucked off site. This evaporation use is esti- <br />mated at 4% of the annual excavated tonnage, which will be based on the maximum annual tonnage <br />for this permit 70,000 tons per year. Therefore, this consumptive use will be 4800 tons of water per <br />yeaz or 1.54 acre-feet annually. It is estimated that the gravel will contain 20% moisture when it is <br />excavated below water level but 16% moisture will seep back into the ground at the location, leav- <br />ing 4% of the aggregate weight mined to exit the property with the end product as a consumptive <br />use. <br />3) Evaporation will occur as a result of pit pumping of water into the Faznsworth Collection Ditch <br />and exposing this water to the surface. Since there is a wetland at the bottom of the Ditch, the in- <br />crease in area of exposed water is used to determine this consumptive use. This is approximately 0.3 <br />acres. Using the rate calculated above of 3.5 acre-feet per acre, this results in a use of 1.05 acre-feet <br />per yeaz. <br />4) Consumptive use for dust control will be zero since no processing is done on this site and no road <br />application is needed since the material will be wet. Therefore, there will be no additional tonnage <br />processed for this application from that already allowed for mining at the Farnsworth #2 Pit. <br />The total consumptive use during mining is therefore 2.59 acre feet ner year for an approximate pe- <br />riod of 4 years. After this time, pumping will stop and the lake will fill up. <br />North Fork Pit March 04 22 <br />