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WATER QUALITY SAMPLING PROTOCOL <br />Procedure <br />The ground water sampling procedure used at the Keenesburg Mine site was <br />approved as part of the Coors Energy Company (CEC) Application for Permit <br />Renewal (1997). CEC has employed this procedure beginning with the fourth <br />quarter, 1997 sample collections. Consent to dispose of Mine Waste Rock at <br />the Keenesburg site (MR #34, 8/98) has resulted in some minor changes to <br />the ground water monitoring plan, pursuant to approval by the Colorado <br />Department of Public Health and Environment (CDPHE). However, field <br />collection procedures, order of sampling, field measurements, frequencies, <br />etc.; these protocols remain essentially unchanged. CEC continues to <br />perform ground water sampling on a quarterly basis, and the 1999 analytical <br />laboratory work was completed by Accu-Labs Research, Inc. (Golden, <br />Colorado). <br />• Ground Water Monitorine and Quality Analysis <br />The formal ground water sampling program for the Keenesburg Mine was <br />initiated in 1992. Ground water quality information has been obtained from <br />monitor wells, located upgradient, within the disturbance area and <br />downgradient to the mine site. The monitoring program provides a basis for <br />comparison of information between a baseline and the existing site conditions <br />relative to ground water flow and water quality at the site. <br />Tlie water quality test results, obtained from the data collected in the field and <br />from the analytical ground water quality analyses, continue to suggest overall <br />groundwater quality in the area has not been adversely impacted by the <br />previous Keenesburg Mine operation or the current reclamation activities, to <br />include the ash disposal operation. Mine waste rock was introduced to the <br />site in the fall of 1998. Its impact (if any) on groundwater quality has not <br />been recognized. While altered within the Keenesburg Mine site itself, <br />general ground water flow patterns in the vicinity of the site appear not to <br />have been significantly influenced (or interrupted) by past mining activities, <br />or by the subsequent ash disposal pits. <br />AI-IR-1999 -44- <br />