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~ <br />11. BACKGROUND INFORMATION <br />' Prior to performing new field work for this project, the following background information was <br />available to Haley & Aldrich to perform this work: <br /> 1. Progress Report, Cooley Gravel Mine -Water Storage Facility, Morrison, Colorado; prepared <br /> by CTL/Thompson, Inc.; dated 5 March 1987. <br /> 2. A 1" = 100' scale geologic map of the mine area excerpted from a 1970 report; author <br />' unknown. <br />' 3. A geologic structure map developed on a 1" = 100' scale topography map (1983 <br />topography); author unknown <br /> . <br />' 4. A I" = 200' topographic map of the mine area depicting existing operations and including <br />delineation of reclaimed and disturbed zones; author unknown; date unknown <br /> . <br /> 5. A 1" = 200' scale areal photograph of the mine area showing the existing crusher and <br /> conveyor system, the disturbed slope area and the eastern mine permit boundary; date <br /> unknown. <br />' 6. A blueprint aerial photograph of the mine area entitled "Morrison Quarry" at L" = 200'; <br />dated 1 April 1992. <br />7. Stereo Pair Aerial Photographs dated 1 April 1992. <br />8. Various drawings including mine plans, topographic maps and survey data, and reclamation <br />' plans. <br />~ 9. Internal memorandum by the Mine Safety and Health Administration (MSHA) regarding <br />' "Open-Pit Highwall Evaluation: Morrison Quarry, (ID No. OS-00864), Cooley Gravel <br />Company, Morrison, Jefferson County, Colorado"; by Robert L. Ferriter; dated 10 <br />November 1992, <br />' 10. An engineering geologic reconnaissance report entitled, "Water Retention Capability <br />Assessment, North Morrison Rock Quarry, near Morrison, Colorado"; by R. J. Irish <br />' Consulting Engineering Geologist, Inc.; dated 4 February 1992. <br />ll, A water supply study report entitled, "Morrison Water Supply Project"; by CH2M Hill; dated <br />' 16 September 1992. <br /> <br /> <br />2 <br />~ ffc=~ <br />