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May 2013 Groundwater POC Memorandum ♦ 2 <br />some circumstances, discharged under the previously identified CDPS wastewater discharge <br />permit. <br />Storm water not captured in the milling circuit or discharged under the wastewater discharge <br />permit is discharged via identified storm water outfalls and via sheet flow to the Williams <br />Fork River. To minimize the volume of storm water that comes into contact with the <br />facility's industrial operations, interceptor canals have been constructed around the west and <br />north end of the tailings pond to deliver unimpacted storm water to the Williams Fork River. <br />A collection system has also been constructed for drainages southwest of the Henderson <br />Mill property that transmits unimpacted storm water through an underground diversion pipe <br />to the Williams Fork River. <br />1.2 OBJECTIVES <br />The groundwater quality for the Upper Colorado River drainage basin has historically been <br />monitored at existing well MLGW -7, located downgradient of 1 -Dam. As described in the <br />Groundwater Management Plan, Henderson recognized the need to evaluate and potentially <br />establish new POC wells near the property line east of 1 -Dam (near MLGW -7 - see Figure <br />2), in the Potato Gulch drainage, as well as east of 3 -Dam (see Figure 3) to provide adequate <br />lateral coverage in areas downgradient of the TSF. Henderson further recognized the <br />potential merits of establishing nested wells at these three potential POC locations, to assess <br />potential deeper groundwater conditions. As such, in 2012, Henderson tasked AJAX and <br />Clear Creek Associates (CCA) to conduct further groundwater studies in the area of TSF to <br />determine: <br />• The appropriateness of MLGW -7's current location and the rationale for or against <br />a nested well at this location; <br />• The appropriateness and recommended location of a POC well in the Potato Gulch <br />drainage and the rationale for or against a nested well at this location; and <br />• The appropriateness and recommended location of a POC well below 3 -Dam and <br />the rationale for or against a nested well at this location. <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 />