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DWR_3391463
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Last modified
2/20/2019 8:56:48 AM
Creation date
2/20/2019 8:56:34 AM
Metadata
Fields
Template:
Dam Safety
Document Date
9/8/1978
Document Type - Dam Safety
Report
Division
3
Dam ID
200224
Subject
HOMESTAKE TAILING POND, LOWER DAM - HYDROGEOLOGIC AND GEOTECHNICAL RECONNAISSANCE
DWR Send/Recipient
DSB
Outside Send/Recipient
ENVIROLOGIC SYSTEMS INC.
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was noted that the seepage has resulted in the death of 3 conif- <br />erous trees along the seepage path, and the death of vegetation <br />in the area. Homestake Mining Company officials have requested <br />permission from the U.S. Forest Service to fence the seepage <br />area and the collection basin. <br />Inspection o•f the soils material associated with the two <br />seeps, and the area of ground -water interception in the pipe <br />ditch reveals that the seepage is occurring along an old stream <br />channel incorporated into the colluvium. The channel appears <br />to be related to the coarse material encountered in Lincoln- <br />DeVore Testholes 4 and 5, and the Dames $ Moore Boring 01. If <br />so, this channel occurs just below the bottom of the cut-off <br />trench at the dam, and "daylights" along the wash at the two <br />seep sites. <br />REGULATORY REQUIREMENTS <br />At present, the EPA does not have stringent regulations <br />covering ground -water pollution resulting from pond seepage. <br />However, existing legislation, in the form of the Safe Drinking <br />Water Act and the Resource Conservation and Recovery Act (RCRA), <br />provide vehicles for such control in the near future. <br />Indications are that the EPA has chosen to use RCRA as the <br />method for control of such pollution. As indicated in the at- <br />tached discussion of RCRA (Appendix A) the legislation is <br />sufficiently broad to permit such coverage. <br />Recently proposed regulations, under RCRA, require the in- <br />stallation of ground -water monitoring facilities downgradient <br />-5- <br />
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