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May 2013 Groundwater POC Memorandum ♦ 3 <br />This Technical Memorandum summarizes recent and historical investigations in the context <br />of evaluating appropriate POC locations and presents the recommendations based on review <br />of these data. <br />1.3 2012 FIELD INVESTIGATIONS <br />Henderson has commissioned various internal studies and field activities to evaluate and <br />address groundwater seepage from the TSF. In 2012, AJAX and CCA implemented a field <br />program to further evaluate groundwater flow and transport pathways east of the 1 -Dam <br />and 3 -Dam facilities and evaluate potential POC locations. The field investigation included <br />the following tasks: <br />• Installation and analysis of nine (9) new monitor wells in the areas east of the 1 -Dam <br />and 3 -Dam. <br />• Aquifer testing and the estimation of representative hydraulic parameters for the <br />aquifer system east of 1 -Dam and 3 -Dam. <br />• Field reconnaissance geologic mapping in the area north and northeast of 1 -Dam. <br />• Water level and water quality monitoring in new and existing internal wells. <br />The results of these tasks augment prior data collection activities and contribute to the <br />development of an updated site conceptual model and a better understanding of <br />hydrogeologic conditions at the Site. <br />AJAX Ltd ♦ 28828 Cedar Circle ♦ Evergreen, CO 80439 ♦ (303) 241 -2057 <br />Clear Creek Associates* 6155 E. Indian School Rd. ♦ Scottsdale, AZ 85251 ♦ (480) 659 -7131 <br />M <br />