INSPEC23232

• Permit No: M1977208
• IBM Index Class Name: Inspection
• Doc Date: 6/24/2004
• Doc Name: Insp Rpt
• From: DMG
• To: CEMEX Inc.
• Inspection Date: 6/24/2004
• Media Type: D
• Archive: No

(Page 2)
MINE ID # OR PROSPECTING ID # M-1977-208
INSPECTION DATE 6/24/04
INSPECTOR'S INITIALS ESC
This was an inspection of the Lyons Quarry conducted by Erica Crosby and Harry Posey of
the ivision of Minerals and Geology. John Lohr and Eric Hodek of CEMEX, Inc. were
present during the inspection. The purpose of the inspection was to take water samples at
the C-Pit and inspect the portions of the Lyons Quarry that have been reclaimed.
Water Sampling of the C-Pit
CEMEX notified the Division on May 17, 2004 of a potential exceedance of the numeric
protcection level (NPL) for selenium based upon sampling conducted on April 16, 2004. The
results indicate the presence of selenium at 0.069 mg/L which is above the 0.02 mg/L NPL
established by the permit under Technical Revision O1 (TR-O1). The Division notified
CEME7~: that the sample might be in error due to the analytical method. The lab report
indicates selenium was measured by the total selenium method. However, selenium is
regulated based on dissolved selenium. The change from total to dissolved method was
effective by the December 30, 2001 regulations for the basic standards for groundwater
(Regulation No. 41) administered by the Colorado Department of Publio Health and the
Environment (CDPHE) Water quality Control Commission.
CEMEX resampled the C-Pit water on June 2, 2004 using the analytical method of dissolved
selenium. On June 21, 2004, CEMEX reported the results of the sample at 0.186 mg/L. In
both samples no selenium was detected in the A-Pit which is down gradient from C-Pit.
Due to the exceedance of selenium in the C-Pit, the Division obtained water samples from
the C-Pit to be evaluated at the laboratory at the Colorado Department of Health and the
Environment (CDPHE). CEMEX obtained a split sample to run at a lab of their choice. See
attached list of parameters that were sampled at the C-Pit. water in the C-Pit was
sample>d at 11:25 a.m. and delivered to CDPHE at approximately 2:20 p.m.
The following sampling methods were used by the CDPHE;
Constituent Method
Metal:: Either EPA 200.7 or EPA 200.8, depending on best detection level
Total Alk Std Meth 2320-B Titration
F Std Meth 4500 FC Zon spec if id electrode
C1 EPA 300.0 Flow injection ion chromatography
Hg-total EPA 245.1
N03-N02 EPA 353.2
Nitrite Std Meth 4500-N02-E
pH Std Meth 4500 H+ - B
TDS Std Meth 2540 C
SO4 EPA 300.0
NOTES from Lab:
1. Apparent miscommunication at check-in caused holding times for nitrate-nitrite to be
exceeded. Harry Posey told lab to run them anyway since they would provide minimum
numbers
2. Extremely high TDS of sample subjects Gross Alpha and Beta to extreme errors. Harry
Posey Y.old lab to not run these.
3. ~~RUSh" turnaround time is 14 days.
Prior t:o water sampling in the C-Pit, the DMG and CEMEX met to discuss the selenium
concentrations in the C-Pit. CEMEX stated the pump from the C-Pit to the cement plant was
non-operational from 9-12 months, which may have increased the concentration of selenium
as evaporation occurred. During that time, water from the A-Pit was used to sprinkle the
cement kiln dust (cxD). The pump has since been fixed, and elevated on a platform to
prevent the suction of sediment from the floor of the pit.