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EXPLANATION TO EXHIBITS FOR <br />SPEER MINING RESOURCE DRMS PERMIT M-1983-176: <br />DRMS POTENTIAL OFFSITE HYDROLOGIC IMPACTS <br />APRIL 2009 <br />EXHIBIT 1: OVERALL AREA NEAR SPEER GRAVEL MINE- Exhibit shows the regional <br />area around the Speer gravel mine and emphasizes the drainage basin for <br />the Henderson or 2nd Creek drainage basin and other key features, <br />including the location of the 120th Estates Partners gravel mine (M-2001- <br />185) and probable leaking slurry wall. Almost always, in the case of alluvial <br />groundwater, the groundwater mimics the direction and flow of the surface <br />water and its drainage basin confines. <br />EXHIBIT 2: ENLARGED MAP OF AREA NEAR SPEER GRAVEL MINE- Exhibit is an <br />enlarged version of Exhibit 1, concentrating on the up-gradient portion of <br />the Henderson or 2nd Creek drainage basin. Of note are the current and <br />future designed flood control culverts for the drainage basin under new <br />120th Ave. Parkway/old 120th Ave. and the former/current <br />perennial/intermittent drainage pathways that exist up-gradient (to the <br />southeast) of the Speer mine site. The flood conveyance culverts have <br />been designed by Adams County (with plans on file) for a minimum flow of <br />612 cfs and a maximum conveyance of flood flows at approximately 2400 <br />cfs. to be determined in the near future. The drainage ditches being <br />currently used by Kirk Kirby have been in place since the 1950's to convey <br />overland water flows, from the same source for the flood control culverts, to <br />the S. Platte River from the Henderson or 2nd Creek drainage AND sump <br />pump flows from the lower levels of houses along old 120th Ave. <br />EXHIBIT 3:1999 AERIAL PHOTO OF SPEER GRAVEL MINE AREA- A further <br />enlargement of the area of concern. Again, this photograph shows the <br />drainage basin of Henderson or 2"d Creek and shows the former/current <br />perennial or intermittent drainage ditches currently being used by Kirk Kirby <br />that have been in place since the 1950's to convey overland water flows to <br />the S. Platte River from the Henderson or 2nd Creek drainage AND sump <br />pump flows from the lower levels of houses along old 120th Ave. <br />EXHIBIT 4: ALLUVIAL WATER WELLS/TABLE/DATA, SAND AND GRAVEL <br />LOCATIONS, BACKFILL ("FILL") LOCATIONS- This exhibit shows the area <br />of concern with emphasis on the groundwater conditions PREVIOUS TO <br />SAND AND GRAVEL MINING in the immediate area and locations of <br />backfill (clean fill dirt and overburden) versus locations of in-place, virgin <br />alluvium or sand and gravel. The locations of documented alluvial water <br />wells and their statistics are presented in graphic form and a table with <br />supporting documentation from the State Engineers Office to show the <br />alluvial water levels previous to sand and gravel mining in the immediate <br />area and, in the case of the wells drilled by John's Drilling and permitted by <br />Kirk Kirby, three alluvial wells drilled and completed during the time of sand <br />and gravel mining. Sand and gravel mining has occurred both up-gradient <br />and down-gradient from the Kirby/John wells. It is evident from the data, <br />that wells drilled and completed during the time of "dry" sand and gravel <br />mining, have much lower static water levels than wells drilled and <br />completed prior to sand and gravel mining, due to de-watering of the sand <br />and gravel for mining. Monitoring wells maintained by Asphalt Specialties <br />Co., Inc. also show the same pattern.