1993-12-15_REVISION - M1977378

• Permit No: M1977378
• IBM Index Class Name: REVISION
• Doc Date: 12/15/1993
• Doc Name: Scope of Work for Cement Creek Conjunctive Flow Characterization.
• From: Golder Associates
• To: Sunnyside Gold Corp
• Type & Sequence: TR14
• Media Type: D
• Archive: No

Golder Associates Inc. Ir
200 Union Boulevard,Suite 500 v = Golder
Lakewood, 30 USA -054 -7 K /q As _•_ �eS
Telephone[phone]
Fax[phone]
tlecember 15, 1993 Our Ref.: 933-2713
Mr. Larry Perino i" ' I g 7 7 -3
Sunnyside Gold Corporation
P.O. Box 177
Silverton, CO 81433
RE: ,/SCOR OF wnRK j+',OR CEMENT f RFF,K CON-HTNCTI VF FLOW
CIIARACTE.RIZATION, SUNNYSIDE IMI NE
Dear Mr. Perino:
In response to a November 18, 1993 letter from the Division of Minerals and Geology
(DMG), Golder Associates Inc. (Golder) has developed a scope of work to characterize
conjunctive flow within the Cement Creek drainage in the vicinity of the Sunnyside Mine.
Characterization of conjunctive flow within the Cement Creek drainage is considered
necessary by the DMG in order to assist in determining impacts from planned plugging of
the American Tunnel.
As you are aware, Golder has completed an intensive review of existing water quality and
water flow conditions (both groundwater and surface water) in the vicinity of the mine.
Golder personnel also conducted a site visit of the mine area on November 29 and 30, 1993.
Reports prepared by Simon Hydro-Search in 1992 and 1993 indicate that tunnel plugging will
result in increased groundwater flow from the mine workings towards the Cement Creek
drainage (i.e., in a southwesterly direction). Based on this direction of anticipated
groundwater flow, it is prudent to characterize conjunctive flow in Cement Creek near the
point at which it exits the Sunnyside property. By characterizing conjunctive flow near the
property boundary, it is anticipated that any increases in conjunctive flow caused by tunnel
plugging will be detected.
Conjunctive flow characterization involves determining the volume of surface water passing
a given point during a specified period of time (e.g., cubic feet per second), as well as
determining the concurrent volume of groundwater within the creek sediments passing the
same point. Surface water flow determinations are relatively straight forward. Determining
the volume of groundwater passing a given point is somewhat more difficult to ascertain.
The approach taken during development of this scope of work to determine groundwater
movement within the creek sediments is to:
► Determine the thickness of creek sediments;
► Determine the groundwater table elevation at various points;
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