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June 29, 2004 <br />Mr. Anthony J. Waldron <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />JUN 3 U [uu4 <br />Diyisi9n of Minerals & GeoloBY <br />Subject: Transmittal of Groundwater Analytical Results <br />GCC Rio Grande Red Rock Plant and Limestone Mine <br />Pueblo, Colorado <br />File No. M-2002-004 <br />March 2004 Sampling Results <br />Dear Mr. Waldron: <br />With this letter, Brown and Caldwell is transmitting to the Division of bfinerals and <br />Geology (DMG) the analytical results for groundwater samples collected at the GCC <br />Rio Grande Red Rock Plant and Limestone Mine Site. Samples were collected and <br />analyzed to satisfy Condition #1 of the Mined Land Reclamation Board's approval of <br />GCC Rio Grande's 112c mining permit application: Baseline Water Quality Sampling. <br />Groundwater sampling for the month of March 2004 was conducted on <br />March 24, 2004. Sampling methods followed those outlined in the Condition # 1 <br />Groundwater Sampling Plan dated March 2003. <br />Groundwater samples were collected from the Saint Charles River alluvial aquifer at <br />monitoring well locations b1W-002, MW-003, and MW-004. Insufficient groundwater <br />was detected in monitoring well MW-001A and therefote could not be sampled. Since <br />the generator for the DW-1 pump was not installed at the time of sampling, no <br />samples were taken of the DW-1 Dakota aquifer well. Samples were analyzed fox the <br />parameters listed in Condition #1. The analytical results are summarized in Tables 1, <br />2, 3, and 4. <br />Attachment A presents copies of the analytical reports prepared by ACZ Laboratories, <br />Inc. and Reservoirs Environmental, Inc. Sample D-12 is a duplicate sample collected <br />from monitoring well MW-004. <br />\\bcden03\projects\Data\GEMF-S-P-T22421\Slipulation Response\Groundwa[er Sampling\Sampling ResultsVdarch <br />2004Vvtar 2004 DMG Letrer.doc <br />