2019-08-14_REVISION - M2002120 ‎(4)‎

• Permit No: M2002120
• IBM Index Class Name: Revision
• Doc Date: 8/14/2019
• Doc Name: SEO Linear
• From: Operator
• To: DRMS
• Type & Sequence: AM1
• Email Name: ECS
• Media Type: D
• Archive: No

COLORADO
aDivision of Water Resources
Department of Natural Resources
August 14, 2019
Gary Linden, P.G.
Civil Resources, LLC
323 Fifth Street
P.O. Box 680
Frederick, CO 80530
Transmission via email: [e-mail]
RE: SLURRY WALL LINER APPROVAL (PROVISIONAL)
BERNHARDT PIT(POND 5) (WDID 0403395)
BERNHARDT PIT, DRMS M-2002-120 (WDID 0403007)
SECTION 1, T4N, R67W
WATER DIVISION 1, WATER DISTRICT 4, WELD COUNTY
Dear Mr. Linden:
The purpose of this letter is to provisionally approve the lining of the Bernhardt Pit (Pond 5). Pond 5 is primarily
located in the N1/2 of the SE1/4 and the SE1/4 of the SE1/4 of Section 1,Township 4 North, Range 67 West of the
61h P.M., and is part of the Bernhardt Pit gravel pit (DRMS M-2002-120). Pond 5 was lined with a soil bentonite
slurry wall. Mining has not commenced within the liner boundary. The slurry wall liner leak test commenced on
April 7, 2019 and concluded on July 8, 2019. A site inspection was performed by our office on April 18, 2019 to
review site conditions and the leak test plan.
Your report dated July 15, 2019 provides the liner summary and leak test results. The test data provided indicates
that liner meets the performance standard referenced in the August 1999 State Engineer Guidelines for Lining
Criteria for Gravel Pits(1999 SEO Guidelines). Meeting the performance standard requires that during reservoir
(pond)operations all water inflows and outflows for the liner perimeter enclosed area be accounted for on a
weekly basis.
This liner approval is applicable only during mining operations at the site and does not classify the structure as a
reservoir capable of water storage. However, for the remainder of mining operations, water within the liner
boundary is now classified as trapped native ground water. The trapped native ground water may be removed
from within the lined area and returned to the stream system through surface flow or ground water recharge
without the need for replacement so long as the operator does not put the water to beneficial use. All native
trapped ground water remaining that is put to beneficial use (except for the water removed in product) must be
replaced by the operator. All inflow of water into the liner boundary from any source, including precipitation and
groundwater inflows shall be removed by the pit operator so as not to cause out-of-priority storage. In order for
the liner to be approved for water storage the operator must perform a final leak test once mining is complete
and the site is at final grade. The final leak test will be allowed to have a modified duration of 30-days as long
as the liner continues to satisfactorily operate during mining operations.
Please contact me at 303-866-3581 x8246 if you have any questions.
Sincerely,
loana Comaniciu, P.E.
Water Resource Engineer
Ec: Jean Lever, District 4 Water Commissioner ([e-mail])
Louis Flink, Diversion Records Coordinator ([e-mail])
WDID File (0403395 Et 0403007)
1313 Sherman Street, Room 821, Denver,CO 80203 P 303.866.3581 www.colorado.gov/water
Jared S. Polls, Governor I Dan Gibbs, Executive Director I Kevin G. Rein, State Engineer/Director
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