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Perched groundwater reservoirs appear to be limited in areal extent and <br />storage capacity, generally producing temporary flows of less than 5 gpm <br />when intercepted by drilling. <br />Drillhole Loas. Exhibit 8, Geologic Information, contains geologic logs <br />derived from drilling, geophysical and core data available from the <br />Southfield database. These geologic logs describe. the lithologic <br />characteristics and thickness of coal and other strata within the permit <br />area. The locations of drillholes represented in Exhibit 8, Geologic <br />Information,-are shown on the Mine Area Geology Map (Map 8). This <br />information is also graphically presented by the Geologic Cross-Sections, <br />(Maps 9 through 11). <br />Physical Proaerties of the Roof/Floor Material. Textural analyses were <br />performed for 10 of the 20 roof and floor samples selected for overburden <br />analyses. Commercial Testing and Engineering Co. of Denver, Colorado <br />completed textural analyses in accordance to USDA Handbook 60, Chapter 6 <br />(428) / ASTM D 422-72. Generally, textural characteristics were <br />relatively consistent for the samples analyzed with no significant <br />difference between roof and floor materials. As summarized by Table 4, <br />Textural Analysis of Roof/Floor Materials, these materials have a <br />relatively high percentage of sand size particles, averaging 659: sand, 22% <br />silt, and 13~ clay. .Roof/Floor materials for the Red Arrow seam are <br />slightly .coarser with higher percentages of sand and silt. <br />Chemical Analyses of the Roof/Floor Material. During 1919 and 1981, <br />available roof/floor samples from the Jack O'Lantern and Red Arrow coal <br />seams were analyzed to determine chemical characteristics of these <br />materials. Samples were selected from available cores penetrating the <br />seams of interest. The samples were analyzed for the purposes of <br />identifying potential acid-forming, toxic-forming or alkalinity producing <br />materials. <br />n n• t n <br />