1988-04-11_PERMIT FILE - C1981008A ‎(5)‎

• Permit No: C1981008A
• IBM Index Class Name: PERMIT FILE
• Doc Date: 4/11/1988
• Doc Name: Nucla East Geology and Overburden Assessment
• Section_Exhibit Name: Tab 6 Attachment 6-1
• Media Type: D
• Archive: Yes

Table 6-1-3 (Cont.)
Criteria for Evaluating Overburden, Interburd n,
Underburden, and Regraded Spoils Suitability ,
Nucla East Mine, Montrose County, Colorado
March 1988
Marginally Unsuitable Except
Parameter Suitable Suitable With Amelioration
Arsenic (ppm) <2.0
32 > 2.0
Cadmium (ppm) <533 >5
Mercury (ppm) <0.534 > 0.5
Lead (ppm) <1035 10-100 >10025
Footnotes:
1
These suitability levels are to be used as a guide in evaluating the degree of
suitability for an overburden, interburden, underburden, or regraded spoil material
for reclamation. The evaluation should take into account the "total system".
Interactive parameters may either nullify or verify the significance of a potential
problem.
2
This value is supported by MDSL (1983) and USDI-OSMRE (1985a).
3
This value is supported by USDA (1979), MDSL (1983), and USDI-BLM (1977).
4
The low limit of this range is supported by USDA (1979) and USDA (1983). USDI-BLM
(1977) recommends a lower tolerance limit of 3.5 whereas WDEQ (1985) suggests 5.0.
5
The upper tolerance limit of this range is recommended by USDA (1979) and WDEQ (1985)
whereas USDI-OSMRE (1985a) proposes 8.8.
6 The actual minimum or maximum acceptable salinity level will depend on the plant
species proposed in the revegetation plan, the potential for upward salt movement, and
the particle size.
7
The lower limit of 8 is recommended by Barrett et al . (1980), WDEQ (1985), USDA
(1983),USDI-OSMRE (1985a), Schafer (1979, 1980), and USDI-BLM (1977). Both MDSL
(1983) and USDA (1979) indicate lower limits of 4 and 6 may be essential for certain
plant species. The upper limit of 12 is proposed by WDEQ (1985) and USDI-OSMRE
(1985a), whereas USDA (1983) and USDI-BLM (1977) recommend 16, USDA (1979) proposes 9,
while MDSL (1983) and Schafer (1979, 1980) specify 8.
8
These values are recommended by USDI-OSMRE (1985a), MDSL (1983), and WDEQ (1985) with
the exception that WDEQ (1985) proposes an upper limit of 80.
6-1-28 Revised 04/11/88