REV89325

• Permit No: M1977215
• IBM Index Class Name: Revision
• Doc Date: 3/25/1998
• Doc Name: FAX COVER TRACER INJECTION SYSTEM DESIGN
• From: WATER MANAGEMENT CONSULTANTS
• To: HOMESTAKE
• Type & Sequence: TR7
• Media Type: D
• Archive: No

FROM WPTER MGT, CONSUL TRNTS
FAX MESSAGE
03.29.1998
• III IIIIIIIIIIIII III
999
To: Roy Cellan
Don Weddell (Miners Inc.)
Company: Homestake
Fax No.: 505-287-9289
303-757-6946
From: Jerry Rowe /Brian Tilton
Dale: 3-25-98
Pages: 3 (including this page)
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17:24 P. 01
~UATER
MANAGEMENT
CONSULTANTS
ta0t SEVENTEENTH ST, SUITE 310
DENVER, COLORADO 80202, USA
TELEPHONE: [phone]
TELFFAx: (303( 2979007
Subject: Tracer injection system design
Presented below arc the suggested specifications to ins[all a tracer injection system for the Bulldog adi[
plug project. The system is designed to allow injection of a fluorescent dye (Rhodsmine WT) behind the
adit plug to determine the effectiveness of the seal.
A schematic of the proposed tracer injection system is attached. The system shall be installed in the adit
before the plug is constructed. Basically, a tracer compound shall be injected into ;/a-inch diameter
polyethylene tubing that is fisted wish small cmi[ters or drip heads every S feet. The polyethylene [ubing
shall he attached to a 1-inch diameter stainless steel pipe that extends through the concrete adit plug. A
gate valve shall be attached to the stainless steel pipe on the portal side. To provide additional security
from damage to the emitters front plugging and/or damage from floating debris or slough, the ~/.-inch
diameter tubing shall he placed inside a 4-inch diameter, perforated, flexible drain pipe. A detailed
description of the materials that will be used to construct the system is presented below.
The 1-inch diameter stt:cl pipe will be constructed out of 316 grade stainless steel and have American
standard Taper Pipe Threads (NPT), A minimum of 26 feet of the steel pipe will be installed through
the concrete forms before the adit plug is poured. Threaded, stainless steel (316 grade) couplings
tvil] be used to attach individual sections of the steel pipe together. The pipe ants couplings shall he
Schedule 40 and meet ASTM A53 specifications. A steel flange, similar to the one installed on the
3-inch diameter drain pipe, shall be attached to portal side of the pipe so that it is securely fastened
into [he adit plug when it is poured. Site installation personnel shall ensure char the pipe extends a
minimum of ]2 incites out of the adit plug ott both sides before it is poured.
• The portal side of the steel pipe shall be fitted wi[h a 1-inch diameter, stainless steel (316 grade) gate
valve. A threaded stainless steel male end plug shall be installed in the open end of the gate valve to
prevent possible leakage if the valve is inadvertently opened.
Polyethylene tubing (3/4-inch diameter) shall be attached to the 1-inch diameter steel pipe on the
upstream (mitre) side of the plug. The tubing shall extend from the plug to daylight curve or as close
to daylight curve as access permits. It is estimated [hat approximately 200 feet of tubing will be
needed. If necessary, the tubing shall be spliced together with barbed nipples and stainless steel hose
clamps. The tubing shall be rated for a minimum 90 pounds per square inch (psi) of pressure. A
threaded/barbed nosed plastic coupling shall be used to attach the tubin¢ to the 1-inch diameter steel