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Well/Sample ID <br />Zn (mg/1) <br />Zn NPL (mg /1) <br />Sulfate (mg/1) <br />Sulfate NPL <br />(mg/i) <br />CRMW -3B -63 <br />0.12 <br />2.0 <br />1,010 <br />1,070 <br />CRMW -3c 124 <br />0.022 <br />2.0 <br />851 <br />1,070 <br />Phase II & III Low Volume Solution Collection (readings in ft) <br />Pump / XDCR #1 (AUTO) Pump / XDCR #2 (AUTO) <br />0.43 0.34 <br />Phase II & III Pond Piezometer (readings in ft) <br />Piezo (Pipe) <br />33.10 <br />Phase IV High Volume Solution Collection (readings in ft) <br />XDCR pipe ( #310 <br />Pump #4 / XDCR #307 Pump #5 / XDCR #308 Pump #6 / XDCR #309 Reserved <br />Phase IV Low Volume Solution Collection (readings in inches) <br />Pump / XDCR #1 <br />12.60 <br />Phase V High Volume Solution Collection (readings in ft) <br />XDCR #311 (AUTO) <br />14.27 <br />Phase V Low Volume Solution Collection (readings in inches) <br />XDCR #001 <br />12.36 <br />13.5 11.8 <br />Pump / XDCR #2 <br />12.80 <br />XDCR #312 (AUTO) <br />14.45 <br />XDCR #002 <br />16.50 <br />External Pond Low Volume Solution Collection (readings in inches) <br />Pump / XDCR #1 -EXT <br />(AUTO) Pump / XDCR #2 -EXT (AUTO) <br />10.9 6.8 <br />XDCR #313 (AUTO) <br />14.62 <br />10.6 9.9 <br />PERMIT #: M -1980 -244 <br />INSPECTOR'S INITIALS: TC1 <br />INSPECTION DATE: May 9, 2012 <br />XDCR #314 (AUTO) <br />14.35 <br />The inspection proceeded to Arequa Gulch where Mr. Lawrence was setup to collect water samples from <br />CRMW 3C (Photo 7). Samples for independent laboratory verification of zinc and sulfate concentrations were <br />collected from CRMW 3C and CRMW 3B monitoring and compliance wells. Water samples from CRMW 3B <br />were collected from the pump back discharge where it discharges into the Arequa Gulch pump back concrete <br />vault. Occasional past sampling results have exceeded the numeric protection level (NPL) of 1,070 mg/1 for <br />sulfate at CRMW. It should be noted that sulfate was selected as a parameter having the potential to predict the <br />presence of acid mine drainage (AMD) and the NPL for Arequa Gulch was based on five quarters of monitoring <br />data well before the VLF expanded to its current footprint. At the request of the Division, CC &V installed a <br />pump -back system to reduce the potential of groundwater flows with high sulfate concentrations to migrate <br />down Arequa Gulch. Sample results are included in Attachment B. Both Zn and sulfate were below the NPLs: <br />Page 3 of 7 <br />