2018-09-21_HYDROLOGY - M2000041

• Permit No: M2000041
• IBM Index Class Name: HYDROLOGY
• Doc Date: 9/21/2018
• Doc Name: Substitute Water Supply Plan
• From: DWR
• To: DRMS
• Annual Report Year: 2018
• Email Name: ERR
• Media Type: D
• Archive: No

Dan Mathes
September 20, 2018
Page 2 of 5
Projected uses and consumption for the period of this SWSP are shown in the attached Tables
1 and 2. Up to 30 acre-feet will be used for the construction of a slurry-lined reservoir, and
12.07 acre-feet will be lost through evaporation from 3.5 acres of exposed groundwater in the
dewatering trench. Total depletions from construction and evaporation are projected to be
42.07 acre-feet.
In accordance with the letter dated April 30, 2010 from the Colorado Division of Reclamation,
Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the
requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the
protection of water resources. The April 30, 2010 letter from DRMS requires that you provide
information to DRMS to demonstrate you can replace long term injurious stream depletions
that result from mining related exposure of ground water. According to the renewal request,
the long term plan for the site is to construct reservoir liners adequate to prevent the
infiltration of tributary ground water. According to the 112c Annual Report received by DRMS
on .tune 4, 2015 (available from the DRMS website at the following link:
htto://drmsweblink.state,co.us/drmsweblink/0/doc/1070247/Electronic.aspxlsearch1d=630e0
d 1 5-6426-4bea-a388-d4228679d6bc), Fremont Paving currently holds a bond in the amount of
$2,095,000.00 for reclamation at the site.
DEPLETIONS
Well permit no. 54064-F (WDID 1406561) was obtained to expose water in this pit. Depletions
under this plan consist of evaporation from 3.5 acres of exposed groundwater within Phase
-Parcel 4 of the mine site and the construction of a slurry wall. The total of 3.5 acres of
exposed groundwater will result in evaporative losses, plus losses associated with the
construction of a slurry wall total 42.07 acre-feet (see attached Table 1) under this SWSR
A Glover analysis was used to create unit response function ("URF") in order to determine the
tagged depletions to the Arkansas River using the following parameters:
• Transmissivity - 100,000 gallons/day/foot
• Storage Coefficient- 0.20
• Distance to the Stream - 2,090 feet
• Distance to No-Flow Boundary- 5,460 feet
The resulting URF shown below was calculated by wrapping the last 5%of depletions into the
first 16 months.
Month 1 2 3 4 5 6 7 8 9 10 11 12
Fraction of 0.15 0.25 0.13 0.08 0.06 0.05 0.04 0.04 0.03 0.02 0.02 0.02
Pumping 0 2 8 6 9 5 8 1 3 9 4 1
Month 13 14 15 16 17 18 19 20 21 22 23 24
Fraction of 0.01 0.01 1 0.01 1 0.01
Pumping 7 4 2 1