REV00152

• Permit No: M1977378
• IBM Index Class Name: Revision
• Doc Date: 8/21/2002
• Doc Name: Bulkhead No. 2 Monitoring
• From: Sunnyside Gold Corp
• To: DMG
• Type & Sequence: TR25
• Media Type: D
• Archive: No

p~e~ved
SUMi~iStS2aE GOLa COFti'ORATION ~ pUG 21 ~
AM ECIiO 8AY COARFANY ~~~p Fi91d Oh1~
P.O. Box 177 Silverton, CO 81433 Wviswn of Minerals & Geela9Y
Phone [phone] Fax [phone]
u~ i t~:;
August 14, 2002
Mr. Wallace H. Erickson, Environmental Protection Specialist ~/
Division ofMinerals and Geology
Department ofNatural Resources
701 Camino Del Rio, Room 125
Durango, CO 81301
RE: File No. M-1977-378 ~'
TR-025, Stipulation No.3 ~
Dear Mr. Erickson:
On March 14, 2001, DMG approved TR-025 with three stipulations. This report is
submitted to demonstrate acceptable performance of Bulkhead No.2 and to request
performance acceptance by DMG so that installation of Bulkhead No.3 can proceed
(Stipulation No.3).
The valve on Bulkhead No.2 was closed on August 31, 2001. Since closure Sunnyside
has monitored the hydrostatic pressure, pH and sulfate levels behind the bulkhead as
required by Stipulation No.3 to demonstrate that design parameters have not been
exceeded. A table of the monitoring results and graph of the hydrostatic pressure rise is
attached for reference. Sunnyside believes that the graph demonstrates that the defmition
of "equilibrium" has been approached and that the design pressure (277 psi), which
represents ground surface elevation, will not be exceeded. The pressure was 175 psi on
August 15, 2002.
As requested in your email received Juiy 31, 2002, Sunnyside has established two more
data points for pH and sulfate to demonstrate that the change observed between the