2012-02-03_HYDROLOGY - M2001017

• Permit No: M2001017
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/3/2012
• Doc Name: SWSP
• From: OSE
• To: Parsons Water Consulting, LLC
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

Site Name
Evaporation
Loss
(ac -ft)
Product
Moisture Loss
(ac -ft)
Dust Control
(ac-ft)
Concrete
Production
(ac -ft)
Total
Depletions
(ac -ft)
Total Net
Depletions * **
(ac -ft)
2012
2013
2012
2013
2012
2013
2012
2013
2012
2013
2012
2013
Lohmann Pit
10.0
10.0
3.8
4.4
1.0
1.0
0.0
0.0
14.8
15.4
54.2
22.1
Rinn Valley Pit
14.1
14.1
13.9
14.6
1.0
1.0
12.3*
13.0**
41.3
42.7
66.7
43.0
Firestone Pit
17.3
17.3
0.0
0.0
0.0
0.0
0.0
0.0
17.3
17.3
-17.3
-17.3
St. Vrain Creek Net Depletions
138.2
82.3
Fort Lupton Pit
11.4
11.4
0.0
0.0
0.0
0.0
0.0
0.0
11.4
11.4
62.0
32.6
Lupton
Meadows Pit
17.9
17.9
31.6
32.9
1.0
1.0
0.0
0.0
50.5
51.8
73.4
53.3
South Platte River Net Depletions
135.4
85.9
otal'Ne =De a wns
WON
8: 2
Mr. Rick Parsons, P.E.
L.G. Everist Combined SWSP
Page 3 of 9
February 3, 2012
Depletions
The depletions resulting from evaporation, water lost in product, dust control and concrete
production are shown in Table D below:
TABLE D - DEPLETION SUMMARY
* Based on 80,000 tons of concrete production and 50 gallons of water per ton of concrete
** Based on 85,000 tons of concrete production and 50 gallons of water per ton of concrete
* ** The total net depletions include accretions credits or depletions from dewatering. The total net depletions for 2010 and 2011
for all pits were taken from Tables 8 and 11
The net evaporation for the Firestone Pit includes a credit of 0.60 acre -feet of consumptive use of
ground water associated with the partial subirrigation of the historically irrigated acreage. No other
phreatophyte credit was applied to the other sites. Computation of evaporation under this plan was
reduced during the ice covered periods. You have assumed the ice covered period to occur during the
months of December, January and February, based on average monthly temperatures Tess than 32 °F
taken from the Longmont 2ESE weather station for the Saint Vrain Pits and Fort Lupton 2SE station for
the South Platte Pits. However, for the purpose of this SWSP, the Applicant shall replace the net
evaporation depletions from the exposed ground water surface area that may occur during the assumed
ice covered period (the months of January, February and December) for any time that the pit is not
completely covered by ice.
Computation of the net evaporation during any time that the pit is not completely covered by ice
shall be determined as the pro -rata amount of the monthly gross evaporation rate distribution amount
identified in the State Engineer's General Guidelines for Substitute Supply Plans for Sand and Gravel
Pits, subtracting the pro -rata amount of the effective precipitation for that period.
The material excavated from the gravel pits is estimated to be approximately 72 percent below
the water table and approximately 28 percent above the water table. According to the "General
Guidelines for Substitute water Supply Plans for Sand and Gravel Pits" the product moisture Toss is
calculated as four percent by weight of mine material excavated below the ground water table and two
percent by weight for the mined material excavated above water table. The Applicant anticipates 2012
mining production at the Lohmann Pit, Rinn Valley Pit, and Lupton Meadows Pit to be 150,000 tons,
550,000 tons, and 1,250,000 tons respectively. For 2013, production at these same sites are anticipated
to increase to 175,000 tons, 575,000 tons, and 1,300,000 tons respectively.
Water used for dust control at Lohmann Pit and Rinn Valley Pit will come from water originally
pumped from the pits for dewatering. Water used for dust control at the Fort Lupton Pit and the Lupton