1993-09-23_REVISION - M1977378 - Laserfiche WebLink

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SENT BY:Sunnvside Gold CorP 09-23-93 03:32PM 30336?5310-) 303 832 S106 # 1 Responses to Division Concerns Page 9 - Samples and f lows of the South Fork of Cement Creek will be taken twice yearly during low flow to aid bromide detection (probably October and February) . If bromide is detected, it will be traced upstream to the source. - sampling of Placer Gulch or California Gulch will not be necessary until the mine pool is above 11, 500 feet. Sampling for bromide will be performed annually during low flow to aid bromide detection (probably September) if the mine pool elevation exceeds 11, 509 feet. If bromide is detected, it will be traced upstream to the source. The sample sites will be just upstream (in each stream) of their confluence with each other. - Eureka Gulch will be sampled annually at Eureka during low flow to aid bromide detection (probably September or October) . If bromide is detected, it will be traced upstream to the source- - The American Tunnel flow before treatment is sampled monthly. Bromide will be added to the analysis list. If bromide is detected significantly above the level CatQblio1lC{7 GOIle=mit gar&njooe►e�r.t=sties n�ee�it�r. ing after valve closure, the cause will be investigated. - This monitoring program will remain in place for five years or until the mine pool has approached equilibrium, whichever is first. 2) Bulkhead Performance The Terry Tuaml grid Marian 2Unno1 balknQfid 01SigU provide a . 1" diameter pipe for pressure gauge installation. These pressure gauges will be read during each bulkhead site visit to track the elevation of the mine pool surface and trigger the monitoring of Placer Gulch and California Gulch at their confluence if the elevation exceeds 11, 509 feet. This information can also be used to limit the search area if bromide is detected during routine stream monitoring by defining the maximum possible elevation of the source. In the most likely scenario (Simon Hydro-Search March 12, 1993) , the equilibrium water level will be approximately 11,500 feet. This is approximately 70 feet below the elevation of the Terry Tunnel bulkhead. If this is the case, the only head that will be on this bulkhead will be that required to back water up to a direct connection to the mine pool (approximately 30 feet) .