2022-10-26_HYDROLOGY - M2008082

• Permit No: M2008082
• IBM Index Class Name: Hydrology
• Doc Date: 10/26/2022
• Doc Name: Substitute Water Supply Plan
• From: Water Resources
• To: DRMS
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

Ready Mix Concrete Substitute Water Supply Plan Page 5 of 9
October 26, 2022
• Distance from centroid of the Stage 5 mining area to Big Dry Creek = 318 feet
• Distance from centroid of the Stage 6A mining area to the Big Dry Creek = 1,356 feet
• Distance from centroid of the Stage 6B mining area to the Big Dry Creek = 1,724 feet
• Distance from centroid of the Stage 6C/6D mining area to South Platte River = 643 feet
• Distance from centroid of the Stage 7A mining area to Big Dry Creek = 665 feet
• Distance from alluvial boundary (based upon CDSS South Platte River alluvial aquifer
boundary mapping
o 7,250 feet for Stage 1 and 2
o 7,830 feet for Stage 3B
0 1,395 feet for Stage 5
o 8,557 feet for Stage 6A
o 8,680 feet for Stage 6B
o 9,164 feet for Stage 6C/6D
o 6,978 feet for Stage 7A
Normalized lagged factors were developed to determine the timing of lagged depletions to the
stream as summarized in the table below:
Depletion Laggiug Factors
Stage 6a Stage 6E Stage 3S Stage 6C'6D Stage 7?
Stage 1 Depletion Stage 2 Depletion Depletion Depletion Depletion Depletion bepletian
Lagging Factors LaggingFactots
La gin Factors Laggiug Factors Lagging Factors Lagging Factors Lagginz Factors
Lagging Laggitxg Lagging Lagging Lagging Lagging Lagging
Month Factor Month Factor Manth Factor Month Factor Factor Month Factor Month Factor
1 0.9580 1 0.4693 1 0.400 7 1 0.2988 1 0.6541 l 0.68 L 7 1 0.8274
2 0.1040 2 02647 2 0 2808 2 0.2921 2 0.2023 2 0.19 L2 2 00610
3 0.0196 3 0.0712 3 0 0815 3 0.0982 3 0.0449 3 00414 3 00319
4 0.0108 4 0.0401 4 00441 4 0.0542 4 0.0742 4 00217 4 00203
s 0.0077 5 00292 5 00299 5 0.0360 5 0.0169 5 0.0142 5 00165
6 0.0238 6 0.0232 6 0.0287 6 0.0134 6 0.0106 6 0.0132
7 00202 7 0.0194 7 0.0240 7 0.0114 7 0.0087 7 0.0117
8 0.0174 8 0.0170 8 0-0210 8 0.0099 8 0.D075 8 0.0010
9 0.0150 9 0.0151 9 0-0187 9 0.0086 9 0.0066 9 0.0082
10 0.0130 10 0.0135 10 0-0168 10 0-0077 LO 0.0060
11 0.0113 11 0.0121 31 0-0151 11 0.0067 L1 0.0055
12 0.0097 12 00169 12 0.0137 L2 0.0049
13 0.0085 13 00099 13 0.0124
14 0.0073 14 00029 34 0.0112
15 0.0080 15 0-0101
16 0.0072 26 0.0092
17 00061 17 0.0083
i
18 0.0059 18 0-0075
19 0.0053 19 0-0068
20 0-0061
21 0.0056
22 0.0050
For4L 1.0000 TOTAL 10000 TOTAL 10000 TOTAL 1.0000 Toi.-LL 10000 TOTAL 1,0000 TOTAL L0000
The total projected lagged depletions from mining operations are shown in Table 2, Column 8, and
total 109.79 acre-feet for this plan period. For purposes of this SWSP depletions are assumed to
accrue to a point on the South Platte River located 1,885 feet from the West Section line and
1,600 feet from the South Section line in Section 6, Township 1 North, Range 66 West, 61h P.M.