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Two post event photos representing the tank and spill clean up have been included as <br />Attachment 2. No event photos were taken at the time of the event. <br />b. Any known or adverse impacts to human health, property or the environment <br />As much of the spill remained within containment, the volume released occurring on a <br />lined area and the short time frame between the release and the cleanup process, no <br />known impacts to human health or the environment have been observed or are expected <br />to occur. <br />c. CC&V Contact <br />For any further information regarding this event please contact; <br />Meg Burt <br />Environmental Manager <br />PO Box 191, <br />100 N 3rs St, <br />Victor Colorado 80860 <br />Work: 719-689-4055 <br />Cell: 775-397-3571 <br />Fax: 719-689-3254 <br />d. Monitoring and analyses that are necessary to evaluate the situation and <br />corrective actions <br />Material captured by the secondary containment was returned into the HGM circuit <br />(Figure 3). <br />All solution released outside the secondary containment but within the lined area was <br />immediately excavated. Impacted material was excavated using the wetting front as a <br />visual determination of the depth and area of the release and was subsequently <br />transported to the Sqauw Gulch VLF. <br />Soil sampling will be completed at the release location to validate that excavation <br />methods were successful in recovering all impacted soil. <br />Monitoring locations nearby the release site will continue to be monitored to determine <br />any impact at the site. <br />e. Results of the Operator's inv_esticiation <br />The root cause of the event was identified as a failure of the 1200 Filter presses which <br />failed due to the press cloth wash pump snapping the pump shaft. <br />The stand by cloth wash pump intake and pump was mudded in (bogged) which initiated <br />an extended period of time to unplug the pump, resulting in the High PH circuit being <br />overwhelmed by the incoming. The operators believed they could recover the cloth wash <br />pump and the 1200 presses before the containment was full. <br />Whilst the initial event was triggered by a component failure, the consequence was <br />accentuated by operations personnel's unsuccessful attempts to recover the plant, <br />during which the circuit continued to feed the High pH circuit. <br />Upon recognition that this would be unsuccessful flow to the high pH circuit was shut off, <br />however the processed material already in the circuit overfilled the containment. <br />