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6REG LEWICKI TEL:1-303-629-9335 R r_02,98 18:17 No .001 F.05 <br />-- - P- <br /> <br />(Ipstream Sampling Station <br />]n July, ]980, an upstream monitoring well was installed approximately 30 feet north <br />of Trout Creek through the alluvium to bedrock in the NW/4 of the NW/4 of Section <br />27, T4N, R86W, approximately 400 feet upstream of the sediment pond point source <br />discharge location. This well was installed to determine tltc quality of the alluvial <br />~ aquifer upstream from the minesite. 7'he well location 'is shown on Plate 1. The well <br />was cased with a 2.5" ID PVC plastic pipe perforated from the water table to the <br />bottom of the hole. Cutting samples were taken and arc described on page 70 in the <br />attached Chen & Associates report on Job iY20,753. 'fhc :annulus was sealed to prevent <br />surface water intrusion. Groundwater samples were taken tri-annually, as outlined on <br />page 65.06. Data is available for this well since September of 1980. <br />Since September of 1980, the following data have been recorded for the well: <br />Well elevation: from -5.6 Feet to -7.0 feet below the well collar. <br />pN: from b.4 to 7.2 <br />EC: from 75 to 140 microtnhos/cm <br />Temperature: 3.0 to 14,4 degrees Celsius depending on the time of year. <br />This data also shows little variation from the water quality of the adjacent 1'raul Creek. <br />In June of ]995, this well was back lied with rocks to the surface since a revision was <br />~ contemplated to abandon monitoring of this upstream station. In 1998, upstream <br />monitoring is to be resumed at this location using a new shallow well. This upstream <br />well is to be installed using the same procedure used to install the downstream well as <br />described below. Both wells are installed pursuant to Technical Revision 9. <br />Uownstrcam Monitoring Wcll <br />Prior to ]998, downstream monitoring rcquircnrents liavc been historically satisfied by <br />using an alluvial well installed by Pittsburgh and Mid+vay Mining Co. ]n the NW/4 of <br />the SW/4 of Section ]4, T4N, R86W. This well it callcei TR-1.5, and is located <br />approximately 2.2 miles downstream of the Apex site. <br />• Revised 8/16/97 /+~' 03 <br />~.CL <br />