2014-02-19_INSPECTION - M1980244

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PERMIT #: M- 1980 -244 INSPECTOR'S INITIALS: TC1 INSPECTION DATE: October 30, 2013 OBSERVATIONS The Division conducted a monitoring and construction progress inspection of the site on October 30, 2013. Mr. Timm Comer (CC &V) was present for the inspection not related to water sample collection, and a post - inspection meeting. The focus of this inspection was to observe hydrologic conditions after the heavy rains and water balance issues reported during September and October. Mr. Lawrence Myers was present during the water sample collecting part of the inspection. Post - Inspection Meeting: Mr. Comer provided a status update on the following activities: • The certification report for the high grade mill liner is in process. • Arequa Gulch VLF barren solution pipe /water balance issue: • CC &V is studying a long term solution to fixing the problem of the pipe leak, • The leaking barren sollution pipe was empty at the time of the site visit, flow had been rerouted, • CC &V using evaporative spraying in the Phase V area to reduce the water volume, • CC &V had inished pumping back water from the external storage pond, • Site received 240% of normal precipitation in September and 180% of normal precipitation over the combined months of August and September. • Construction of the concrete tanks for the Process Solution Enhancement System (PSES) had begun. • Arequa Gulch VLF liner slough: the liner has been repaired. The the drain cover fill (DCF) had yet to be replaced. • Construction activities on the new mill platform has shifted to the facilities. Concrete walls for the buildings were being poured. Inspection: The Division observed completed geomembrane liner for the PSES pipe rack liner extension project (see Photos 1 and 2). The inspection proceeded to Arequa Gulch where Mr. Lawrence Myers (CC &V Environmental Compliance Coordinator) assisted with the collection of split water samples from: 1) South Underdrain, 2) CRMW 3B -63, and 3) CRMW 5C -60 (new well) (see Photos 3 and 4). Field parameters and 3`d quarter split water quality samples for independent laboratory verification of Weak Acid Dissociable (WAD) cyanide (CN), dissolved zinc, and sulfate concentrations. Water samples from CRMW 3B -63 were collected from the pump back discharge where it discharges into the Arequa Gulch pump back concrete vault. Water samples from CRMW 5C -60 were collected from the field pump discharging from the monitor well. Sample results are included in Attachment B. All parameters were below their respective NPLs: Well /Sample ID WAD CN (mg/1) WAD CN NPL (mg/1) Zn (mg/1) Zn NPL (mg/1) Sulfate (mg/1) Sulfate NPL (mg/1) South Under 0.0063 0.20 1.1 2.0 1,010 1,070 3B -63 -- -- 0.0831 2.0 892 1,070 CRMW 5C -60 -- -- ND tbd 137 tbd The inspection continued as the Division visited each of the high and low solution collection system transducers and recorded water level values. The recording sheet is included as Attachment A, and the values are summarized below in the Transducer Readings. Page 2 of 6