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Previous Studies and Additional Information <br />Two additionol cross sections located in the West Ridge area are provided, <br />Exhibits 2.2-6 and 2.2-7. These exhibits, including the associoted lithologic logs are <br />Taken from the D'Appolonia Report, Hydrologic Relationships and Mine Inflow <br />Assessment, November 1977. The lithologic logs are found in Section 2.2.4.1. <br />Surface samples of overburden spoils were obtained on West Ridge, along with <br />lithologic samples from two additional drill holes. The drill holes are numbered 05- <br />01-0014 and 05-01-0015 and the surface samples are numbered 05-01-0016 and 05-01- <br />0017. Chemical and physical properties were analyzed using the parameters, units <br />and procedures recommended by the Colorado Mined Land Reclamation Department <br />(MLRD). The additional parameters for heavy metals, as requested by the MLRD, <br />were analyzed for drill holes 05-0{-0004, OS-01-0008 and OS-01-0009. The lithologic <br />analysis was performed by Commercial Testing and Engineering Co, of Denver, <br />Colorado. The results are found in Section 2.2.4.2. <br />2.2.3.2 Collection of New Information <br />• A total of 12 holes were drilled at The Edna Mine (see Exhibit 2.1-2) in order to <br />sample overburden and interburden associated with the Wadge and Wolfcreek coal <br />seams. One hole was drilled in the reclaimed area of the Edna Mine site to sample <br />existing spoil material. The procedure for the I I holes penetrating coal consisted of <br />drilling and chip sampling to approximately 10 feet above the coal seam of interest <br />(Wadge or Wolfcreek). Each hole was cored from at least 10 feet above the coal <br />seam, through the coal seam to the next lower aquifer or 50 feet, whichever was <br />less. A{I samples collected were placed in bags and identified with tags. Each tag <br />contains the P8M drill hole identification number, the sample interval, WWLL's <br />identification number, and the date drilled. Samples split for laboratory analysis <br />were given an identical tag. Chip samples were collected for each lithologic stratum <br />encountered from the surface to the core point. For the purposes of laboratory <br />analysis, strata thicker than 15 feet were homogenized, split and sampled across 10- <br />foot intervals. Strata thinner than four feet were homogenized with surrounding <br />lithologies based on their relative thicknesses and sampled across 5-foot intervals. <br />Two-and-one-half-foot core samples were selected for analysis. Special care was <br />taken to sample representative lithologies. Coal cores were sent to P8M Engineering <br />. for special analysis. Section 2.2.4.1 contains drill logs as well as geophysical logs for <br />all drill holes. <br />Revised 7-81 <br />2.2-7 <br /> <br />