1987-12-01_PERMIT FILE - C1981017 ‎(165)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: David E. Fleming Company Prepartation Plant Area Surface Drainage Plan
• Section_Exhibit Name: Chapter II Attachment 3 to Appendix II-B-7
• Media Type: D
• Archive: No

TABLE II-B-App 7-Att 3-3*
COMPUTATION OF SEDIMENTATION POND CAPACITIES
FOR
PREPARATION PLANT AREA
Volume of
Drainage 10-Yr/24Hr 10-Yr/24-Hr Disturbed
Sub-Basin Area Rainfall "C" Runoff Area
Number (Acres) (Inches) Value (AP) (Acres)
(1) (2) (3) (4) (5) (6
1 2.00 1.9 .65 0.21 1.68
2 2.25 1.9 .66 0.24 1.81
3 10.54 1.9 .62 1.03 9.83
3A 7.51 1.9 .25 0.30 7.51
4 10.75 1.9 .25 0.43 10.75
5 10.95 1.9 .25 0.43 10.95
6 2.07 1.9 .25 0.08 2.07
7 1.93 1.9 .25 0.08 1.93
Required Required Volume of Total
• Sediment Detention 25-Yr/24-Hr 25-Yr/24Hr Pond
Capacity Capacity Rainfall Runoff Capacity
(AF) (AF) (Inches) (AP) (AP)
(8) (9) (10) (11)
0.34 0.55 2.2 0.24 0.58
0.36 0.60 2.2 0.27 0.63
1.97 3.00 2.2 1.20 3.17
1.50 1.80 2.2 0.34 1.84
2.15 2.58 2.2 0.49 2.64
2.19 2.62 2.2 0.50 2.69
0.41 0.49 2.2 0.09 0.50
0.39 0.47 2.2 0.09 0.48
Explanation of Columns:
(2) -- From Table 3
(3) -- From Figure 2
(4) -- Selected value, see text for discussion
(5) -- Col. (2) x Col. (3) x Col. (4) t 12
(6) -- Col. (2) - area occupied by buildings
(7) -- Col. (6) x 0.2 per Part 717.17 (e) (2) of Reference 3
(8) -- Col. (5) + Col. (7)
(9) -- From Figure 2
(10) -- Col. (2) x Col. (4) x Col. (9) j 12
(11) -- Col. (7) + Col. (10)
*See revised chart on page 21 of this section.
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