2016-09-16_PERMIT FILE - M2016010

• Permit No: M2016010
• IBM Index Class Name: Permit File
• Doc Date: 9/16/2016
• Doc Name Note: Response #5
• Doc Name: Adequacy Review Response #5
• From: Transit Mix Concrete Co.
• To: DRMS
• Media Type: D
• Archive: No

Transit Mix Concrete Co.
Table G-5
Sediment Detention Basin Capacity Summary
Sediment Watershed 100-yr, 24hr Sediment Total
Detention Area Storm Runoff Capacity Capacity
Basin (ac) (ac-ft) (ac-ft) (ac-ft)
NEP-SP-1 40.22 8.70 1.74 10.44
P-DET-1 149.13 31.88 6.38 38.26
F1-SP-1 4.76 1.72 0.34 2.06
NP-SP-1 101.94 23.43 4.69 28.12
NP-SP-2 30.39 13.02 2.60 15.62
NP-SP-3 14.04 6.00 1.20 7.20
P-SP-1 76.12 15.86 3.17 19.03
P-SP-2 199.86 41.36 8.27 49.63
RD-SP-1 5.05 1.55 0.31 1.86
RD-SP-2 18.14 3.83 0.77 4.60
RD-SP-3 7.02 2.01 0.40 2.41
RD-SP-4 12.86 3.17 0.63 3.80
c. Culverts
Culverts will be used for the access road, the natural drainages, and in limited areas as means
of conveying temporary flows down steep slopes via drop culverts. The access road includes
culverts at each of the stream crossings and at sag points along the road to convey the collected
water from roadside ditches to the sediment ponds. Culverts have been designed to convey
runoff from the 100-year, 24-hour storm with various headwater to diameter (HW/D) ratios. As
much as possible the approach was to use a HW/D ratio of 1.0 or less. Where significant flows
were encountered, attempts were made to use multiple culvert barrels to minimize the
headwater depths. Where the number of barrels grew excessive, then higher HW/D ratios were
used.A summary of the culvert designs is included as Table G-6. Stream crossings with culvert
diameters of 96 inches or less will utilize a circular corrugated metal pipe (CMP). Erosion
protection is provided using riprap at the inlet and outlet of each culvert. Typical designs for the
culverts are shown in Figure G-15.
Culverts LTC-CC-1 through LTC-CC-6 are located along Little Turkey Creek or its tributaries
and DC-CC-1 is located on Deadman Creek. The flow values for these culverts were calculated
for the 100-year, 24-hour flow using SEDCAD. The SEDCAD design reports are included in
Attachment G-1.
Hitch Rack Ranch Quarry Permit Application M-2016-010
September 15, 2016 G-18