_GENERAL DOCUMENTS - C1981017 (262)

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-34- Analyses of mine discharge in Volume 5 shows that the discharge from all the mines is lower, on the average, in iron levels and sediment levels than the receiving stream. Heavy metals are not a problem, as evidenced by the stream analyses and roof and coal analyses. Discharge water from Mine No. 4 enters the South Fork of Dutch Creek which is monitored at Station ;=6. This discharge would increase the soluble salt content by 231 mg/1 to a level of 598 mg/l . Therefore, the discharge would increase the soluble salts to a level of a moderate +� salinity hazard, lwhereas the water would have a low salinity hazard \vl prior to discharge. Mine no. 4 is currently inactive, but as indicate., in the application, will become active upon completion of the rock tunnel . / l Discharge water from Mines No. 1 and 2 enters the North Fork of Dutch Creek, and is monitored at sampling station r7. The discharge water would increase soluble salt concentrations in the North Fork of Dutch Creek by an average of 327 mg/l to a level of 764 mg/l which changes the OvIr salinity hazard for irrigation use from low to moderate. Discharge from Mine No. 3 enters the Oil Well Creek drainage which is monitored by station i& The mine discharge increases the soluble salt content in Uil Well Creek by an average of 489 mg/l to 836 mg/l , which is a change from a low salinity hazard to a moderate salinity hazard. Mine No. 5 discharges into Coal Creek, which is monitored by sampling station #9. The mine discharge increases the soluble salt content in Coal Creek by 11 mg/l , which does not change the low salinity hazard designation. Although the discharge from Mines No. 1 , 2, 3, and 4 degrade the water at the discharge point from a low salinity hazard to a moderate salinity hazard, the discharge water is further diluted downstream. By the tune any of the water reaches the Crystal River, it is at a low salinity hazard. As a worst case condition, with a1l �mins and reparations plant ponds discharing simultaneously, ��he soluble salt ler'el of Coal Creek immediately below the last discharge point would be increased by_ 177 mg/1 The water below the final discharge point would have a moderate salinity hazard for irrigation use. However, by the time the water reaches the Crystal River, .vhich is the first point of diversion of Coal Creek water, and is further diluted by tributaries, the soluble salt level would be reduced to la�l 'which translates to a low salinity hazard. c1- t u• _r � �C'I�.ttiY�Q n'l ov2 w ?JY' / d�Y rq � �L� r� S Yv�l1 G�rd��•� �mrrlQY .)�leIN. y �eI�I ,,Y m....>� o`Ye��( c��e.c��s ,, �� l� �C�p 9,c.��..,c��t�;� � �. `' cjlsCha4t" �JY� T1n Q. (O S �u-v�r� ,9 c-J -vr!t OAS t USDI. 196d. dater Quality Criteria. Reoor: of the 'rational WWW ;ecanical advisory Commictee to the Secretary of the Interior. .ed. .rater Pollution Control Acmin. C3 Ue.