2013-11-13_HYDROLOGY - M1974069

• Permit No: M1974069
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/13/2013
• Doc Name: SWSP
• From: OSE
• To: Bishop-Brogden Associates, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

Loveland Ready -Mix, Inc. Combined SWSP
November 12, 2013
Page 2 of 5
The subject pits are currently augmented under LRM's plan for augmentation decreed in case
no. 2000CW142. The decreed augmentation plan relies on LRM's Barnes Ditch inches changed in
case no. 2000CW143 and storage releases from Loveland Ready Mix Pond Nos. 1 and 2, both of
which are typically delivered directly to the stream at the reservoir outlet works. Due to the recent
flooding of the Big Thompson River, the storage ponds were heavily damaged. LRM therefore is
seeking to make replacements for the subject pits under this SWSP until the necessary repairs can be
completed and replacements can again be made pursuant to case no. 2000CW142.
Depletions
During this SWSP period, depletions will consist of evaporation losses at the Larimer, Mariana
Butte, and Baer Pits, and production depletions at the Larimer Pit. Total depletions for each site are
shown in the following table:
Table B — Site Depletions (acre -feet)
Site Name
Evaporation
Water Lost in
Concrete
Dust Control
Total
Mined Product
Production
Larimer Pit
(Pit Nos. 13, 14, 15, & 18)
76.98
0.29
5.94
2.21
85.42
Mariana Butte Pit
6.22
NA
NA
NA
6.22
Baer Pit
36.44
NA
NA
NA
36.44
Evaporative depletions were calculated using a gross annual evaporation of 3.15 feet (37.8
inches) from the post -1980 exposed water surface. Net evaporative depletions for the Larimer Pit
include a credit of 7.20 acre -feet for 2.98 acres of phreatophytes, 9.05 acre -feet for 7.51 acres of non -
irrigated native vegetation, and 34.52 acre -feet for 36.81 irrigated acres. Net evaporative depletions
for the Mariana Butte Pit include a credit of 2.64 acre -feet for 2.81 irrigated acres. Net evaporative
depletions for the Baer Pit include a credit of 7.24 acre -feet for 6 acres of non - irrigated native
vegetation, and 10.51 acre -feet for 11.2 irrigated acres. The historic natural depletions associated with
the land covered by each type of vegetation were calculated as described in paragraph 14.2.2 of case
no. 2000CW142.
The Applicant has estimated that 10,000 tons of aggregate will be produced from the Larimer
Pit during this plan period. The material is mined below the water table and is washed; therefore the
water retained in the mined product is considered to be 4.0% of the mined material by weight (9.6
gallons per ton). The Applicant has estimated that 64,500 cubic yards of concrete will be produced at
the Larimer Pit during this plan period. Water consumption for concrete production was estimated at
1,950,000 gallons based on a consumption rate of 30 gallons of water per cubic yard of concrete. The
Applicant has estimated that 720,000 gallons of water will be used for dust control at the Larimer Pit
site during this plan period. Dust control was considered to be 100% consumptive.
The monthly ground water depletions from each pit were lagged to the Big Thompson River
using the Alluvial Water Accounting System (AWAS), which uses the Glover method. The following
parameters were used in the model: the distance (X) from the centroid of the exposed ground water
surface to the river, the width (W) of the aquifer on the side of the river where the pit is located, the
harmonic transmissivity (T); and the storage coefficient (S). The parameters used for each pit site are
shown in the table below.