REV96528

• Permit No: C1981023
• IBM Index Class Name: Revision
• Doc Name: REQUEST FOR PHASE II BOND RELEASE AT KAISER VENTURES INC CHIMNEY ROCK MINE
• Type & Sequence: SL3
• Media Type: D
• Archive: No

Table 5.8.2-1 Subwatersheds 1-1-1-1 and 1-2-1-1 CP Factor

1

1

No appreciable canopy
% Ground Cover
In Contact With
Ground Surface 40 52 i 60
100% grass 0.10 .042
94% grass 0.101 0.066 0.043
100% weeds (forbs) 0.15 0.090
Table 5.8.2-3 Subwatersheds 1-1-1-4, 1-2-1-2, 2-1-i-1, 2-2-1-2, and 2-2-2-1 CP Factor
No appreciable canopy
% Ground Cover
In Contact With
Ground Surface 40 56 60
100% grass ~ 0.10 ~ ~ .042
99% grass ,j 0.10 0.058 j 0.042
100% weeds (forbs) 0.16 0.090
Table 5.8.2-4 Subwatershed 2-2-1-1 CP Factor
~ No appreciable canopy
% Ground Cover
In Contact With i
Ground Surface ~ 60 69 80
100% grass 0.042 ~ 0.013
99% grass 0.042 0.029 j 0.013
100% weeds (forbs) 0.090 0.043
~.9 Grass Filter
The entire length of the AVF area would act as a grass filter for the great majority of runoff
from the east pit prior to such runoff reaching natural streams (Stollsteimer Creek) in the
area. In this analysis, the first 100 feet is considered as a grass filter. The grasses are
equated to a fescue in the SEDCAD+ selection tables, a Manning's n of 0.0140, and a stem
to stem spacing of 2 inches. The height of grass was selected as 7 inches, infiltration = 0.03,
and stiffness factor of 20. The size of the representative filter was a length of 100 feet, a
width of 100 feet, and a slope of 3%.
Page 19 of 34, 7 Oct 96