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1697 Cale Boulevard <br />Suit< 200 <br />Golden, Colorado 80401 <br />Tel: (303) 239-5400 <br />Paz (303) 239-5454 <br />www.brownandcaldwell.com <br />November 12, 2003 <br />Mx. Anthony J. Waldron <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />Department of Nataral Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />RECEIVED <br />NOV 131003 <br />Dtvtsion of Minerals and Geology <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 />August 2003 Sampling Results <br />Dear Mr. 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 application: Baseline Water Quality Sampling. <br />Groundwater sampling for the month of August 2003 was conducted on August 25, <br />2003. 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 and MW-004, and from the Dakota aquifer at <br />monitoring well DW-1. Groundwater was not detected in monitoring wells MW- <br />OOlA and MW-003; therefore, MW-001A and MW-003 could not be sampled. <br />Samples were analyzed for the parameters listed in Condition #1. The analytical <br />results are summarized in Tables 1, 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-5 is a duplicate sample collected <br />from monitoring well MW-004. Sample MW-006 is an equipment blank collected by <br />pouring bottled distilled water over equipment used at multiple monitoring well <br />locations. <br />P:\Data\GEN\F-S-P-T\22421\Stipulation Response\Groundwater Sampliug\SampGug Resul[sWug 2003U1ug 2003 DMG <br />Lettu.doc <br />E n~v i r o n m e n t a l E n g i n e e r s d C v n r u l t a n r s <br />