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SFNI' BY: B- 4-93 ;12:43PM ; CANONIE ITIGL~1900P+ <br />x • • <br />4 <br />4.0 COMPARE ANALYTICAL DATA TO INS7REAM STANDARIDS <br />Table 4 presents the number of water quality exceedances upstream of the mill site <br />at Wlliams Fork River above the portal (HW-1i and downstream of the mill site at <br />Williams Fork River below Ute Creek (HW-4). Measured concentrations were <br />compared to Colorado instream standards for 30-day average discharge without a <br />documented 10-year, 24hour event. For cadrnium and manganese the number of <br />exceedances downstream was the same or fewer than the number of exceedances <br />upstream. For copper, Iron, and lead there ware more exceedances downstream than <br />upstream. For zinc there were no axcoedancea. The exceedances for copper may <br />result, In part, from the analytical detection level being higher than the instream <br />standard. The exceedances may indicate analytical error or levels of copper abcrve the <br />standard. <br />;# 9/19 <br />IM{W:4J~ISWBIOIrllJp7 IAW. {, IYHI <br />