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The Division conducted a monitoring inspection of the site on May 9, 2012. Mr. Mark Vanoni and Mr. Lawrence Myers <br />(CC &V) were present during the inspection. The primary focus of this inspection was to collect 2 " quarter water <br />monitoring samples. <br />Mr. Timm Comer (CC &V) provided updates on the status of the Phase V DCF failure and the Phase V spill inspected by <br />the DRMS on April 17, 2012: <br />DCF failure — AMEC and the liner crew were continuing their investigation. The exposed liner and the liner <br />under the disturbed DCF will be tested for damage. Prior to any ore palcement, the DCF will be <br />recertified and the liner will repaired and recertified. <br />Spill Area — CC &V is continuig to excavate the spill area. Soil is to be excavated 10 feet beyond the wetted soil. <br />CC &V will sample to depth where the off -liner soil is dry. Structureal backfill will begin after <br />verification from the lab is received indicating the remaing soil is not adversely affected. AMEC <br />will investigate and develop a mitigation plan. <br />Inspection: <br />Mr. Vanoni provided an in- the -field overview of the DCF failure and spill area ongoing investigation efforts. <br />Photo 1 shows the Phase V spill area. Photos 2 — 5 show the excavated area. Photo 6 shows the Phase V DCF <br />slope failure. <br />The inspection continued as the Division visited each of the high and low solution collection system transducers <br />and recorded water level values. The recording sheet is included as Attachment A, and the values are <br />summarized below in the Transducer Readings. <br />The Arequa Gulch underdrains were inspected. The South Underdrain discharge was measured to be 1.8 gpm. <br />Both the North Underdrain and the AG /Spring were dry. The flowmeter installed for the B63 pumpback line <br />indicated a flow rate of 0.52 gpm. The A35 pumpback line was dry. No flow was observed in the Arequa Gulch <br />flume (AG 1.5- OO1A). <br />Transducer Readings: <br />Phase 1 High Volume Solution Collection (readings in ft) <br />Pump #299 / XDCR #xx Pump #300 / XDCR #00 <br />40.4 32.2 <br />Pump #301 / XDCR #01 Pump #302 / XDCR #02 Pump #303 / XDCR #03 <br />Phase I Low Volume Solution Collection (readings in ft) <br />Pond LvI / XDCR #1 <br />42.20 <br />22.5 26.9 29.0 <br />Phase I Pond Piezometers (readings in ft) <br />Piezo #1 (HAND) <br />0.35 <br />System Press / XDCR #2 <br />42.00 <br />Piezo #2 (AUTO) <br />0.44 <br />OBSERVATIONS <br />Phase II & III High Volume Solution Collection (readings in ft) <br />Pump / XDCR #4 Pump / XDCR #5 Pump / XDCR #6 <br />13.5 13.1 14.3 <br />PERMIT #: M- 1980 -244 <br />INSPECTOR'S INITIALS: TC1 <br />INSPECTION DATE: May 9, 2012 <br />Page 2 of 7 <br />