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June 29, 2004 ~~~~e>~Ep <br />~ ~ t JUN 3 0 2004 <br />Mx. Anthony J. Waldron givisimt of Minerals & Geology <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 />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 />Apti12004 Sampling Results <br />Dear Mx. Waldron: <br />With this letter, Brown and Caldwell is transmitting to the Division of Minerals 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 apphcation: Baseline Water Quality Sampling. <br />Groundwater sampling fox the month of April 2004 was conducted on April 27, 2004. <br />Sampling methods followed those outlined in the Condition # 1 Groundwater <br />Sampling Plan dated March 2003. <br />Groundwater samples were collected from the Saint Charles River alluvial aquifer at <br />monitoring well locations MW-002, MW-003, and MW-004. The generator for the <br />DW-1 pump was installed and operational at the time of sampling, so samples were <br />also taken of the DW-1 Dakota aquifer well, Insufficient groundwater was detected in <br />monitoring well b1W-001A and therefore could not be sampled. Samples were <br />analyzed for the parameters listed in Condition #1, except for radiochemistry from <br />monitoring wells MW-002, MW-003, and MW-004, as there were not enough sample <br />collection bottles to collect water fox radiochemistry analysis. The analytical results axe <br />summarized in Tables 1, 2, 3, and 4. <br />Attachment A presents copies of the analytical reports prepared by ACZ Laboratories, <br />Inc. and Reserooixs Environmental, Inc. Sample D-13 is a duplicate sample collected <br />from DW-1, the Dakota aquifer well. <br />\\bcden03\projects\Data\GEMF-S-P-722421\Stipulation Response\Groundwa[er Sampling\Sampling Results\Apri12004Wpr <br />20P1 DMG Letter.doc <br />