DWR_3391228

• Document Date: 10/1/1982
• Document Type - Dam Safety: Report
• Division: 3
• Dam ID: 200224
• Subject: HOMESTAKE TAILING POND, LOWER DAM - REMEDIAL MEASURES CONSTRUCTION REPORT
• DWR Send/Recipient: DSB
• Outside Send/Recipient: DAPPOLONIA CONSULTING ENGINEERS, INC.

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TABLE 2
CYANIDE CONCENTRATIONS IN
PIEZOMETERS DOWNSTREAM FROM SLURRY WALL
FREE CYANIDE (mg/1)
SAMPLE POINT NO.
DATE 25 26 29 30 31
July 14, 1981
23
33
-
- -
August 3, 1981
25
33
-
- -
September 8, 1981
31
32
-
- -
October 7, 1981
32
33
-
- -
November 2, 1981
29
28
-
- -
December 7, 1981
34
26
-
- -
February 2, 1982
28
22
-
- -
March 8, 1982
25
16
-
- -
April 6, 1982
26
12
-
- -
June 2, 1982
16
10
-
- -
July 27, 1982
14
13
3.2
0.6 -
August 6, 1982
14
20
3.1
0.1 -
August 17, 1982
13
20
2.3
0.4 -
September 2, 1982
o
17
19
0.6
<0.01 <0.01
September 14, 1982
26
19
1.6
0.02 -
January 17, 1983
0.04
0.03
0.11
0.01 0.02
Notes: 1. Slurry wall completed 3uly 16, 1982.
,Piezometers were evacuated (bailed out) on September 9, 1982.
3. See Figure 2 for location of sample paints.