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In addition, the recommended pH limit of 9 . 0 (for cold water <br /> biota) was exceeded when the pH recorded on 9/15/78 was 9 . 1 . <br /> Porcupine Creek' s water quality is determined <br /> entirely by natural conditions , and is unaffected by mining . <br /> However , it should be noted that the Porcupine Creek sampling <br /> data do not provide suitable baseline material for monitoring <br /> the effects of mining because the creek drains a slope less <br /> steep than those associated with Coal, Dutch and Bear Creeks , <br /> and runoff response time is different . Further, it drains <br /> a south facing area, whereas the other streams drain north <br /> facing areas . Therefore, water draining the Porcupine <br /> watershed may not be representative of the physical and <br /> geochemical characteristics of the mine complex . <br /> Coal Creek, above the confluence ;with Porcupine <br /> Creek, (CC-3) had higher concentrations of sulfate, alkalinity, <br /> cadmium, copper , iron, lead and total dissolved solids than <br /> did Porcupine Creek. The data compares reasonably well with <br /> that from Bear Creek (undisturbed drainage) so the concentra- <br /> tions are thought to occur naturally . <br /> Data from the station on Coal Creek above the <br /> confluence with Dutch Creek (CC-2) was composited sampled <br /> and compared with other samples from the Porcupine and Coal <br /> Creek drainages . dater quality was comparable . <br /> The Dutch Creek sampling station (DC-1) <br /> drains the Dutch Creek #1 and #2 , and the Bear Creek #4 mine <br /> entries . Data collected indicate an average dissolved <br /> -22- <br />