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concentrations of the A2 produced water were to remain constant, and that the entire produced volume of <br />A2 water were to infiltrate through the subsurface to mix with the Laramie Formation aquifer, the <br />resultant A2 water quality would dramatically improve when mixed with even a small volume of the <br />saturated Laramie Formation. In fact, due to the very low total dissolved solid (TDS). concentration of the <br />produced A2 water, the mixing analysis shows that the resultant TDS value would be markedly decreased <br />if the pump test produced water were to mix with the saturated Laramie Formation. <br />It should be noted, however, that it is extremely unlikely that the produced A2 water will ever mix with <br />the Laramie Formation aquifer in the quantity or quality presented in the mixing calculations. The <br />unsaturated distance between the infiltration pit and the saturated zone of the Laramie Formation is about <br />100 feet, and the stratigraphy of the unsaturated zone is complex with inter-bedded zones of mudstone <br />and coal. Due to the unique geochemical properties of constituents such as uranium and radium, these <br />elements will react with the surrounding sedimentary mineral assemblages, and will immediately replace <br />other elements and become immobile during the infiltration process. In addition, a percentage of the <br />produced water will evaporate during infiltration into the unsaturated zone of the Laramie Formation. <br />Please find the enclosed confidential and public DRMS application forms and attachments for NOI <br />modification, along with a check for the $86.00 application fee. Powertech is hereby requesting that the <br />DRMS review and approve NOI modifications to file number P-2008-043 at your earliest opportunity. <br />Below is a list of attachments to aid the DRMS in their review. <br />• Attachment A - Tabulated location information of the off-channel water infiltration pit. <br />• Attachment B - Centennial project area map showing the location of the off-channel water <br />infiltration pit. <br />• Attachment C - Design of the proposed off-channel water infiltration pit. <br />• Attachment D - Additional site specific information of the proposed off-channel water infiltration <br />pit location. This attachment includes two photographs of the site as well as vegetation <br />information and disturbance calculations. <br />• Attachment E - Water quality analytical results for the A2 pump test water and the uppermost <br />Laramie Formation aquifer. Also included in attachment E is an A2 sand and Laramie Formation <br />groundwater dilution mixing analysis. <br />If you have any questions or require additional information, please feel free to contact Richard Blubaugh <br />at (303)790-7528 or Michael Beshore at (970)556-5988. <br />Sincerely, <br />Richard E. Blubaugh <br />Vice President-Environmental Health & Safety Resources <br />Enclosures <br />cc: J. Mays <br />T. Walsh <br />M. Beshore <br />3 <br />P-2008-043 Mod #2