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MINE INFLOW STUDY <br />Purpose: To meet compliance of Stipulation Number 5 under our proposed decision <br />and findinys of compliance, <br />1. An annual mine inflow survey (i,e, water quality - field testing of pH, <br />electro conductivity, and temperature; water quantity - inflow and outflow) <br />shall be performed during June of each year, This will he performed at all <br />areas within the mine with measureable flow. <br />2, A map of mine inflow will indicate whether the inflow source is from a <br />fault, fracture, roof, rib or floor, The various areas of mine inflow will <br />be a numher subscripted on the map which is referenced to a table. This ta- <br />ble will detail the physical location within the mine, date of sampling, <br />quantity of inflow, quality of inflow, and any additional comments. <br />3. If mine outflow becomes excessive, the monitoring of mine inflow will be <br />similar to existing surface monitoring (monthly field testing, quarterly lab <br />testing, etc,) <br />A, Inflow Quantity surveys shall be performed in the following manner: <br />1. Roof inflow shall be measured by a calibrated container over a cer- <br />tain time interval depending on the amount of inflow. <br />2, Floor and rib inflow shall he determined ny the use of a V-notch <br />weir. <br />3. Some areas might not permit measurement by the preceeding methods, <br />such as the area in the North intakes. If water does not permit ac- <br />cessibility, then a pond or dam type measurement will he performed, <br />The assumption with this method will be that seepage has not occur- <br />red , <br />R, Inflow quality shall be performed as follows: <br />1. Field parameters of pH, electroconductivity, and temperature will be <br />analyzed, <br />2. This data will be recorded on the appropriate tables, <br />3, Periodic review of data will be completed to confirm theoretical <br />calculations. <br />4, A flow meter will be installed in the mine outflow line which is presently <br />located in the beltline entry. The flow meter presently installed in the <br />mine inflow line from the surface tank will be maintained and quantities re- <br />corded, These two meters, along with the meter installed in the 100,n00 <br />gallon tank for surface use, will he read once a month on the same day of <br />the month, This data will be recorded on the appropriate tahle, <br />5. If a new area of unusual significant inflow develops within the mine, that <br />area will be monitored as soon as possible not to exceed 72 hours. After <br />the initial monitoring, it will be sequenced with the existing monitoring, <br />f,lose contact with underground personnel will be maintained to provide in- <br />formation indicating new areas of inflow, <br />