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2.04 APPLICATION F'CR PERTffT FOR SURFACE OR UNDII2GROUND MINING ACTIVITIES -- <br />MINIl~IUM RDQUIRII~TL'S FOR II~'(~i2MATION ON ENVIRaNMENPAI, RESOURCES <br />• 2.04.8 Climatological Information <br />(1) Climate Characteristics of the North Fork Valley (COnt'd.) <br />(b) and (c) (Cont'd.) <br />CWI compiled snow course data in 1982 - 1985. The courses are located in <br />the Stevens Gulch Drainage Basin and are used to confirm snow melt v.s. <br />rainfall data. Enough data was collected to confirm existing government <br />published data. CWI subsequently discontinued monitoring of snow courses. <br />In response to Stipulation Number 5 of the Division's proposed Decision <br />and Findings of Compliance dated June 29, 1985, CZ^Ti began operating an <br />evaporation pan station at the Stevens Gulch well field. Data was to be <br />gathered until the hydrologic budget for the drainage basin was confirmed <br />in order to provide a basis for distinguishing between natural and mine <br />related water losses within the basin. <br />SZibsequent evaluation of the evaporation pan and related data was <br />conducted by COVCC in March of 1992. GbVCC concluded that insufficient <br />data had been collected to define a detailed water budget for the Stevens <br />Gulch drainage capable of distinguishing between natural and mine related <br />water losses for specific resources within the basin. COVCC further <br />concluded that the scope and quantity of additional data required to <br />accurately assess the water budget was prohibitive and of limited value <br />given that the pre-mining water budget was not accurately defined and <br />• therefore no basis for comparison exists. Based upon these conclusions, <br />CbVCC applied to the Division of Minerals and Geology for a technical <br />revision (TR-21) to eliminate the requirement to operate the evaporation <br />pan. The technical revision was subsequently approved by the Division. <br />CWI has two high volume particulate samplers for sampling large volumes of <br />air for the collection of suspended particulate matter. These samplers <br />are located as shown on the Orchard Valley Mine Facilities Map No. 8A-8. <br />Each filter for these units is weighed and the sent to CWI and placed in <br />the samplers. The units are set to run on the Colorado Department of <br />Health, Air Pollution Control Division's 4-day schedule. After running <br />for 24 hours, the filters are stored for future weighing and analyses. <br />The results of the analyses are then summarized in a report. Presently, <br />Air Sciences Inc. of Lakewood, Colorado, is providing this service to CWI. <br />For additional information, see Climatology Appendix, Volume 9. <br />Tables 2.04-17 & 18 in the Climatology Appendix, Volume 9, set forth the <br />Air Quality Data Reports on the total suspended particulates measured in <br />g/m3 since June, 1979, at the two monitoring stations. Data collected <br />from 1979 to 1983 are also included. A maximum 24 hour particulate <br />loading of 64 u/m3 is fairly close to the national mean for non-urban <br />regions. <br />The ability to define, measure, and control anthropogenic (man-caused) <br />Visibility impairment depends upon several fundamental factors. These <br />include: a) the <br />TR 93-21 Revised 03/17/93 <br />63 <br />