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Hyd~oGeo, Inc. Surface & Groundwater Hydrology Draft Technical Memo To: Mr. Henry Barbe, Mountain Coal Company, LLC r" Fa ~ , R~ •~,9 JED From: Joe Frank, HydroGeo, Inc. Date: December 6, 2005 DEC 12 2005 Re: SILV-EX Spill Monitoring Report ~iNsion of INinerals and Geddpy 1.0 INTRODUCTION Six empty 55-gallon plastic barrels of SILV-EX fire-fighting foam concentrate were blown over and out of the "Corrals" containment area in the Lower Dry Fork of Minnesota Creek (Lower Dry Fork) drainage during a rain storm event on November 12, 2005. Residue from the barrels spilled out of the containment area and flowed into the Lower Dry Fork, near the Lower Dry Fork Flume (sampling site MC-1), which flows into Minnesota Creek. It is estimated that less than 1 gallon of SILV-EX mixed with the surface water runoff from the rain and flowed into Lower Dry Fork (MCC, 2005). As required by the Colorado Division of Minerals and Geology (CDMG) and the Colorado Department of Public Health and Environment, Water Quality Control Division (CDPHE, WQCD), Mountain Coal Company, LLC (MCC) filed an Incident Report (File #2005-746) of the accidental spill on November 14, 2005 (MCC, 2005). In order to verify that there are no measarable traces of the SII,V- EX foam concentrate in Dry Fork or Minnesota Creek, the CDMG stipulated that MCC collect stream samples for laboratory analysis at least every 0.5 mile from the "Corrals" azea near the Lower Dry Fork Flume (MC-1) to Apple Valley Pazk in Paonia (MC-14). Apple Valley Park iswithin %z mile of the confluence with the North Fork of the Gunnison River. Mr. Henry Bazbe of MCC commissioned HydroGeo, Inc. (I-IydroGeo) to collect the aforementioned stream water quality samples and deliver them to Enviro-Chem Analytical, Inc. in Grand Junction, CO for analysis. This technical memorandum summarizes the field monitoring methodology and results of the laboratory analyses. The locations of the sample sites are presented in Figure 1.