REP33845

• Permit No: M1977208
• IBM Index Class Name: Report
• Doc Date: 9/16/2004
• Doc Name: Wildlife Resource Assessment Rpt
• From: DMG
• To: DOW
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Cobrado 80203
Phone: [phone]
FAX: [phone]
DATE: September 16, 2004
TO: Bruce McCloskey
Division Director
Colorado Division of Wildlife
NE Regional Office
6060 Broadway
Denvl~r, CO 80216
FROM: Ron~l~' Wr!'Cattany; Division of Minerals and Geology Director
COLORADO
DIVISION O F
MINE6RALS
GEOLOGY
0.E CLAMATION•MINING
SAFETY•SCIENCE
Bill Owens
Governor
Russell George
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
RE: CElv(EX, Inc. Lyons Quarry, Permit No. M-1977-208, Wildlife Resource Assessment
Report
The Division of Minerals and Geology (DMG) received a wildlife resource assessment report from
Michael Figgs of LREP on behalf of CEMEX, Inc. for the Lyons Quarry, Permit No. M-1977-208. The
mine site is located in north-central Boulder County, Colorado. The report was submitted to the DMG in
response to recent water samples taken at the C-Pit that exceed DMG established numeric protection
levels for groundwater.
For background information, cement kiln dust (CKD) generated at the Lyons Quarry is a by-product of
cement manufacturing. The CI{D comprises dust-size particles that appeaz from analyses to be mostly
lime, with smaller quantities of slaked or partially slaked shale, limestone, gypsum and other minor silica
or clay impurities.
The sampling point at the CEMEX operation is an abandoned limestone quarry pond, referred to as the
C-Pit. C-Pit was established by the DMG as the groundwater monitoring point, and the A-Pit located
approximately'/< mile east of the C-Pit is the compliance point. These monitoring stations were
established to monitor potential contaminants from CICD that is stored in the C-Pit. Specifically, these
two points aze used to monitor compliance with DMG established numeric protection levels for
groundwater down gradient of the CKD facility.
The Division sampled the C-Pit on June 24, 2004. Based on the analytical results, the sample shows
exceedances for the following parameters:
Pazameter Value Standazd Comment
or MCL
Cl 750 m 250 mg/L Secondary standard; not a wildlife or human health hazard
pH 12.5 6.5-8.5 Significant exceedance. Could present problem by contact or
by ingestion to birds.
Se 0.184 ug/L 0.02 ug/L 9x exceedance of agriculture standazd; 3x exceedance of
drinldn water standard.
TDS 5550 mg/L 550 mg/L Exceedance of ambient groundwater values not known, but
based on geology, such high TDS in undisturbed groundwater
would not be expected. Effect on ambient groundwater
uali , locall , is ossible.
SO4 1800 mg/L 250 mg/L Exceeds secondary drinking water standard. No human health
or wildlife effects aze likely.
Office of
Mined Land Reclamation
Office of
Active and Inactive Mines
l
Colorado
Geological Survey