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• Perched groundwater reservoirs appear to be limited in areal extent and storage capacity, generally producing temporary flows of less than 5 gpm when intercepted by drilling. Drillhole Loas. Exhibit 8, Geologic Information, contains geologic logs derived from drilling, geophysical and core data available from the Southfield database. These geologic logs describe the lithologic characteristics and thickness of coal and other strata within the permit area. The locations of drillholes represented in Exhibit 8, Geologic Information, are shown on the Mine Area Geology Map (Map 8). This information is also graphically presented by the Geologic Cross-Sections, (Maps 9 through 11). Physical Prooerties of the Roof/Floor Material. Textural analyses were performed for 10 of the 20 roof and floor samples selected for overburden analyses. Commercial Testing and Engineering Co. of Denver, Colorado • completed textural analyses in accordance to USDA Handbook 60, Chapter 6 (426) / ASTM D 422-72. Generally, textural characteristics were relatively consistent for the samples analyzed with no significant difference between roof and floor materials. As summarized by Table 4, Textural Analysis of Roof/Floor Materials, these materials have a relatively high percentage of sand size particles, averaging 65% sand, 22% silt, and 13% clay. Roof/Floor materials for the Red Arrow seam are slightly coarser with higher percentages of sand and silt. Chemical Analyses of the Roof/Floor Material. During 1979 and 1981, available roof/floor samples from the Jack O'Lantern and Red Arrow coal seams were analyzed to determine chemical characteristics of these materials. Samples were selected from available cores penetrating the seams of interest. The samples were analyzed for the purposes of identifying potential acid-forming, toxic-forming or alkalinity producing materials. 2.04.6-9