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1697 Cole Boulevard <br />Suite 200 <br />Golden Colorado 80401 <br />Tel: (303) 239-5400 <br />Fax: (303) 239-5454 <br />www.brownandcaldwelLcom <br />July 28, 2003 <br />Mx. 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 />RECEIVED <br />JUL 2 9 2003 <br />Division ~f 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 />Apri12003 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 />Gxoundwatex sampling fox the month of Apti12003 was conducted on April 23, 2003. <br />The anticipated sampling date for the April event listed in the Condition #1 <br />Gxoundwatex Sampling Plan was April 14, 2003. Sampling methods followed those <br />outlined in the Condition # 1 Groundwater Sampling Plan dated March 2003. <br />Gxoundwatex samples were collected from the Saint Charles River alluvial aquifer at <br />monitoring well locations MW-002, MW-003, and, MW-004 and from the Dakota <br />aquifer at monitoring well DW-1. Gxoundwatex was not detected in monitoring well <br />MW-001A installed in the Codell sandstone; therefore, MW-OOIA could not be <br />sampled. Samples were analyzed fox the parameters listed in Condition #1. The <br />analytical results axe 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 MW-005 is a duplicate sample <br />collected from monitoring well MW-004. Sample MW-006 is an equipment blank <br />collected by pouring bottled distilled water over equipment used at multiple <br />monitoring well locations. <br />P:\Data\GEMF-S-P-722421\Permi[[ing\S[ipulafion Response\Gxoundwatex Sampling Plan\DMG TransmitalsWpril <br />2001revised 7.11.03.doc <br />E n v i r o n m e n t a l E n g i n e e r s es' C o n s u l t a n t s <br />