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• system referred to in the quotation has winds perpendicular to the valley <br />axis on the aides and parallel to the axis on the valley bottom resulting <br />from differential heating and cooling during the day. The majority of the <br />mine lies within the Trout Creek Valley which, although it has a north-south <br />axis, is much more open than the Oak Creek Valley. It is assumed that Trout <br />Creek Valley will also generate winds, but not nearly as strongly or often <br />as Oak Creek. As a result of topographically generated winds, wind speeds <br />are expected to be highest during the morning and evening as the land mass <br />heats and cools, with a low at night when solar energy input is absent <br />(Exhibit 2.6-6). Wind directions will be normal to the elopes on the valley <br />sides and parallel to the valley axis in the valley bottom. <br />2.6.5 AIR QUALITY MONITORING SYSTEM <br />The Edna Mine conducted air quality monitoring from January 1980 <br />through June 1983 using a network consisting of three weather stations and <br />four total suspended particulate (TSP) sampling sites about the Edna Mine. <br />• The network was designed to meet the monitoring guidelines of the Colorado <br />Department of Health, Air Quality Control Division, whose advice and consent <br />were sought during the design of the system. <br />In 1983, the Edna Mine petitioned the Colorado Department of Health to <br />discontinue the air monitoring program as the previous two-and-one-half <br />years' data demonstrated that TSP concentrations remained within air quality <br />standards. Upon reviewing the petition and associated data, the Colorado <br />Department of Health granted the request. A copy of the request approval is <br />included as Exhibit 2.6-7. <br />2.6.6 MINING AND RECLAMATION INFORMATION <br />No long-term changes in the temperature, precipitation or wind patterns <br />in or near the Edna Mine are expected to be caused by mining. However, in <br />the areas where topsoil will be removed, the temperature and near-surface <br />winds will change from the time the vegetation is removed until it is <br /> reestablished. Higher daytime near-surface air temperatures are likely <br />. after the vegetative canopy is removed and the darker soil or rock surface <br />2.6-8 <br />PR-67 <br />0007.0.0 <br />04/18/86 <br />