2011-08-09_HYDROLOGY - M1987049

• Permit No: M1987049
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/9/2011
• Doc Name: SWSP
• From: OSE
• To: Bishop-Brogden Associates, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: DB2
• Media Type: D
• Archive: No

Month
Exposed
Ground
Water Area
(acres)
[11
Gross
Evaporation
Rate
( inches)
J21
Effective
Precipitation
Rate
(inches)
L}3
Net
Evaporation
Rate
('inches)
[
Historical
North
Tower Pit
ET Credits
[5]
Net
Evaporation
[61
Gravel
Production
(tons)
[71
Aggregate
Moisture
Content
Depletion
[8]
Total
Site
Depletion
[91
Aug
1293
5.81
0.6
5.2
0.6
55.1
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N N N W M M iFi M 9 N N N
56.7
Sep
129.3
4.30
0.6
3.7
0.4
39.2
40.7
Oct
104.9
3.01
0.4
2.7
0.2
23.1
24.6
Nov
104.9
1.72
0.4
1.4
0.0
12.0
13.1
Dec 2011
104.9
1.29
0.
1.0
0
8.8
9.7
Jan 2012
104.9
1.29
0.8
0.5
0
3.9
4.8
Feb
104.9
151
1.1
0.4
0
3.4
4.2
Mar
104.9
2.37
2.0
0.4
0.0
3S
4.4
Apr
104.9
3.87
13
2.5
0.1
22.1
23.0
May
104.9
5.16
0.8
43
02
37.5
39.1
Jun
104.9
6.24
1.1
5.2
03
44.8
46.3
Jul
104.9
6.45
0.6
5.8
0.7
50.2
51.7
Aug
104.9
5.81
0.6
5.2
0.6
44.6
52,000
13
46.2
Sep
104.9
4.30
0.6
3.7
0.4
31.7
52,000
IS
33.3
Oct
104.9
3.01
0.4
2.7
0.2
23.1
52,000
13
24.6
Nov
104.9
1.72
0.4
1.4
0.0
12.0
38,000
1.1
13.1
Dec 2012
104.9
1.29
03
1.0
0
8.8
30,000
0.9
9.7
Jan 2013
104.9
1.29
0.8
0.5
0
3.9
30,000
0.9
4.8
Fab
104.9
1.51
1.1
0.4
0
3.4
30,000
0.9
4.2
Mar
104.9
237
2.0
0.4
0.0
3.5
30.000
0.9
4.4
Apr
104.9
3.87
13
2.5
0.1
22.1
30,000
0.9
23.0
May
104.9
5.16
0.8
4.3
0.2
37.5
52,000
13
39.1
Jun
104.9
6.24
1.1
5.2
05
443
52,000
1.5
46.3
Jul
104.9
6.45
0.6
5.8
0.7
50.2
52,000
1.5
51.7
2011 -2012 Total
-
43.00
10.0
33.0
2.8
304
500,000
14.7
3183
2012 -2013 Total
-
43.00
10.0
33.0
2.8
286
500,000
14.7
300.3
irate, comalu•sr• err$110?- a810011f• ASSOCrarrs• JNC.
Table A
Ready Mixed - Bromley Lakes Site
Depletion Analysis (August 2011 - July 2013)
Proposed SWSP Operations
(all values in ecro-fcet unless specified)
Notes:
[1] Total surface uca of exposed ground water is 1293 acres in August and September 2011 and 104.9 acres from October 2011 through July 2013 (28 antes at North Tower Pit,
24.4 acres at Bromley Lakes Cell 2 until September 2011 when it will have been completely filled in, 46.5 acres at Bromley lakes Cc113, 25.4 access at Ready Mixed Pit 1, and
approximately 5 awes at Atends Pit).
[2] Gross evaporation rate equals 43 inches (358 8) per year, based upon NOAA Evaporation Atlas. Monthly distribution based upon SB-120 Guidelines.
[3] Effective precipitation Mato equals 70% of total precipitation, based upon the Brighton weather station and NOAA Colorado Annual Avenge Precipitation 1951 -1980 Map.
[4] Net evaporation equals [2] - [3].
[5] Historical ET credits at the North Tower Pit from 7.4 awes of pasture grass using ground water at a depth of 4 feet (does not include an effective precipitation credit).
[6] Net evaporation equals the net evaporation volume minus the historical ET credit, [ 1] x [4y12 - [5].
[7] Production is projected to begin at Arcade Pit at the beginning ofAugusl2011.
[8] Aggregate moisture content equals 4% by volume.
[9] Total site depletion equals [6] + [8].
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