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C-PIT Hydrogeologic Investigations <br />Technical Revision No. 8 <br />2: Site Analysis and Field Activities Minin Permit M-1977-208 <br />and the freeze/thaw cycle. See Photo No. 1 through 3 in Appendix C, and the 1981 Plan and Profile drawing <br />for the relocated canal in Appendix B. <br />Construction field notes and related documents confirm that the canal relocation project was managed by <br />Martin Marietia's quarry supervisor, and that the effort was performed concurrently with the mining of the <br />limestone. This is confirmed by the historical aerial photography. Records and aerial photos also confum <br />that as late as mid-1993, Martin Mametta's successor Southwestern Cement was still mining the area east and <br />adjacent to the relocated canal and west of C-Pit. Some historical documents indicate that at this time there <br />was a plan to also relocate the Swede Ditch to the west, parallel to the recently relocated Feeder Canal. <br />However, air photos and subsequent documents confirm that this did not occur. Therefore, an undismxbed <br />block of limestone and overlying Smoky Hill Shale remains under the present day alignment of the Swede <br />Ditch. <br />NCWCD construction logs indicate that in late February 1983, the Martin Marietta mining/construction crew <br />"broke thru" and shattered the "triangle" of bedrock that separated the new canal from the original alignment <br />at the north end. (See the excerpt from the 1983 construction field notes in Appendix B.) The records are <br />unclear as to how the new canal bottom, which was cut into the bedrock at the north end, aligned with the <br />existing canal bottom. The documents reference the need to fill in the bottom up to grade at the transition <br />into the existing canal, with the recognition that the filled area (referred to as a "hole' may require removal <br />and rework if it "moved during operation." This may be an indication that there is a limited segment of the <br />present day canal bottom that is not cut into bedrock, at the point where the relocated canal des into the <br />original canal alignment at the north end. <br />NCWCD construction field notes also indicate that Martin Marietta planned to "grout" the east side of the <br />new canal where it transitioned into the existing channel (at the "triangle"). The design drawings for the <br />Canal relocation project indicate that an earthen "plug" with ripxap was specified at the point where the new <br />ditch merged with the existing ditch. Brown and Caldwell's field inspection has confnmed the presence of <br />degraded shotcrete along the bottom of this fill that makes up the eastern canal wall at this location. See <br />Photos No. 4 and 5 in Appendix C, and the 1981 Plan and Profile drawing in Appendix B. <br />The historical air photos are attached as Appendix B to this report, and axe summarized below. <br />' May 12, 1979 Air Photo <br />The original alignment of the Boulder Feeder Canal is visible and full of water. The Swede Ditch is visible to <br />' the east of the Feeder Canal, and the C-Pit area is undisturbed. Mining is underway to the west of the Feeder <br />Canal (B-Pit), with ponded water visible at various locations at the base of the eastern highwall of B-Pit. To <br />the southeast, extensive mining is underway in the A-Pit area. <br />' Oetober 6, 1986 Air Photo <br />Active mining is now visible in the C-Pit area. Mining in A-Pit is still underway, and activity in B-Pit is <br />' primarily located in the southern portions. Both the new and the original Boulder Feeder Canal alignments <br />west of C-Pit axe visible, and the area between the two is disturbed by haul roads and mining activity. The <br />northern section of the new Canal cut into bedrock, north of the bridge that provides access to B-Pit, as well <br />as the fill portion south of the bridge, appear to be substantially completed (see Figure 2). The connection <br />' has been made at the north end where the new Canal transitions into the old. The connection at the south <br />end of the Canal does not appear to be completed at this time. <br /> <br />1 ~ ~ <br />2-2 <br />Use 01 conlenis on Ihls shee\ is Subject Ie the hmda\ions speeded ai the entl of this document. <br />\1BCDEN02\pro~ecis\Data\GEN\Cemex~TR-e'~Reporting~CEMEX Report 0831-O7.dw <br />