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April 1998 Monthly Report <br /> Page 2 <br /> "B List" Projects <br /> - Columbus Mine Portals -Mine Waste Dumps <br /> - London Mine Portals - Waste Dumps <br /> Work, permitting or arrangement for access is not planned until it <br /> becomes evident that the work plans for these projects require <br /> implementation. <br /> - Cement Creek Diversion and Water Treatment <br /> Cement Creek diversion and water treatment was active <br /> continuously throughout April. The entire flow of Cement Creek <br /> was diverted for treatment. The flow in April ranged from 229 <br /> G. P.M. to 736 G. P.M. <br /> Attached are April 1998, monitoring results for; dissolved <br /> metals in the AT-004 discharge; Cement Creek diverted for <br /> treatment (CC-1B) ; American Tunnel flow before treatment (AT- <br /> INFEL) ; and Cement Creek below the AT-004 discharge point (CC- <br /> 20) . <br /> - Mainstem Stream Monitoring and Reference Point Stream <br /> Monitoring <br /> Sunnyside sampled the reference point (A-72) on April 8, 1998 <br /> along with the three mainstem gaging stations (A68, M34 and <br /> C48) . These April sampling results are attached. <br /> The provisional flow at A-72 was 86 cfs which places this <br /> sample result in the low flow category (Q<100 cfs) . The <br /> dissolved zinc value obtained by averaging the results from <br /> two labs was 880 ug/l . Since this result gives an index <br /> number greater than +2 (+2 . 91) , each lab re-analized the <br /> sample as required in the Consent Decree. The average result <br /> from these four analyses is 858 ug/1 which is the reported <br /> value for April 1998. <br /> The index number for the April sample is calculated as follows: <br /> Xi= 858 <br /> Xc= 519 <br /> Sf= 124 <br /> Ni= (Xi - Xf)/Sf <br /> Ni= (858 - 519)/124 <br /> Ni= +2 .73 <br />