2012-06-25_HYDROLOGY - M1977348

• Permit No: M1977348
• IBM Index Class Name: HYDROLOGY
• Doc Date: 6/25/2012
• Doc Name: Requirement for Additional Groundwater Characterization/Sampling
• From: DRMS
• To: HOLCIM
• Email Name: ECS
• Email Name: TAK
• Email Name: AJW
• Media Type: D
• Archive: No

DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
June 25, 2012
Mr. Toelle:
Mined Land Reclamation
Holcim US
Attn: Michael B. Toelle
3500 State Hwy 120
Florence, CO 81226
STATE OF COLORADO
RE: File No. M- 1977 -348; Boettcher Limestone Quarry; Requirement for Additional
Groundwater Characterization /Sampling.
The Division of Reclamation Mining and Safety (DRMS) has completed its review of the
groundwater monitoring analytical results reports for the March 2011 through March
2012 quarterly sampling events at the Boettcher Limestone Quarry site. Unfortunately,
it appears that some analytes have consistently exceeded the applicable MCL/benchmark
values. In particular, the levels of barium in MW3 and MW4, and TDS levels in MW4
were consistently over the MCL/benchmark values. There were also consistent minor
exceedences of the MCL for boron in MW3.
As previously stated, if groundwater is shown to be impacted above applicable
benchmarks, additional monitoring, plume delineation, and perhaps remedial actions may
be required to release the site in accordance with 3.1.7 of the Construction Materials
Rule. Section 3.1.7(8) of the construction materials rule states that to achieve Release of
Reclamation Liability "An operator shall demonstrate, to the satisfaction of the Office,
that reclamation has been achieved so that existing and reasonably potential future uses
of groundwater are protected." To this end, the Division believes that further
characterization of the aquifer and current uses of groundwater in the area is required so
that Holcim and the Division can determine an appropriate path forward to the eventual
full release of the site.
The Division believes that, at a minimum, the following issues need to be addressed:
• What is the current extent of the impacted groundwater both vertically and
horizontally? Can it be shown that the impact is still confined to within
the permitted area?
• What specifically is the local geology? How might site geology influence
future migration of impacted groundwater, and how does it relate to
construction of the site monitoring wells and nearest surrounding /down-
gradient wells?
COLORADO
D I V I S I O N O F
RECLAMATION
MINING
— &—
SAFETY
John W. Hickenlooper
Governor
Mike King
Executive Director
Loretta Piiieda
Director
Office of Office of
Denver • Grand Junction • Durango Active and Inactive Mines