2011-11-09_PERMIT FILE - P2011032 (4)

Home Browse Search

• • .\ • Underground water will be routed into pipes and drains where practicable to avoid sediment suspension from contact with personnel and equipment passing through the tunnel • Underground water will be routed into newly constructed sumps adjacent to the tunnel to provide settling time of suspended solids liberated during the exploration activities • All portal discharge is captured within an armored and bermed channel that routes flows away from the working waste rock pile into a large sedimentation pond. The pond was constructed in the 1980s under the pre- existing discharge permits and was been sized appropriately to allow for adequate time for suspended solids to settle. • Stormwater controls are still in place from the 1980s operations and will be maintained during new operations to ensure that no nonpoint pollution sources will impact the surface water quality • Up to 500 gallons of diesel fuel will be stored on site in approved mobile storage containers. Spill prevention measures will be kept on site for use in case of any incidental release (55 gallon drum for disposal, and sorbent towels for any spills). • Explosives will be stored on site during the working season, and will be stored in a dry location and in a manner that is approved by both the BATF and MSHA. • Human waste will be contained within a regularly maintained port-a -poty located on the surface. A total of five locations within the site setting were sampled during the past six quarters in order to characterize the baseline (pre- disturbance water quality character) water quality setting above, within and below the Oyama Tunnel site setting (refer to Figures A -2 and D -1 for the sample site locations). A summary of the sampling efforts is as follows; • First Quarter — • Second Quarter — • Third Quarter — • Fourth Quarter — • Fifth Quarter — • Sixth Quarter — Oyama Tunnel Hydrologic Monitoring Plan Summer 2010 (9/20/2010) Fall 2010 (10/04/10) Winter 2010 (concealed by significant snow accumulation) Spring 2011 (6/30/11) Summer 2011 (7/25/11) Fall 2011 (10/23/11) (results pending) A summary description of the sampling locations is as follows; • BB- CDPS001 : Oyama Tunnel portal discharge • BB- CDPS002 : Within the nearest perennial stream ABOVE the diffuse confluence with the portal discharge • BB -A : Exploratory borehole outfall at the Oyama Tunnel portal • BB -B : Settling pond outfall • BB -C : Within the nearest perennial stream BELOW the mixing zone of the diffuse confluence with the portal discharge • BB -D : Within the nearest perennial stream further BELOW the confluence, approximately 3,200 feet downstream from location BB -C.. In compliance with direction provided by CDPHE, two of the sample locations were chosen specifically to meet the CDPS renewal application requirements. One sample (CDPS002) was collected `above' the portal discharge's diffuse confluence with the nearest perennial stream, while the second was taken from the perceived future point of compliance, the Oyama Tunnel portal discharge (referred to as CDPS001). The remaining sample locations were chosen to characterize the baseline hydrologic setting to meet Attachment D: Page 3 of 4