2016-12-13_HYDROLOGY - M1977208

• Permit No: M1977208
• IBM Index Class Name: HYDROLOGY
• Doc Date: 12/13/2016
• Doc Name: Water Monitoring - Groundwater
• From: Cemex
• To: DRMS
• Report Quarter_Month: 3
• Email Name: MAC
• Media Type: D
• Archive: No

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RECEIVE®
December 8, 2016 DEC 13 2016
Mr. Michael Cunningham DIVISION OF RECLAMATION Via FEDEX
Division of Reclamation, Mining and Safety MINING AND SAFETY TRK#7778 9137 3412
Environmental Protection Specialist
1313 Sherman Street, Room 21S
Denver, Colorado 80203
Re: CEMEX Lyons Mine Permit M-1977-208
Technical Revision No. Revised Groundwater Monitoring Plan
Third Quarter 2016 Monitoring Data
Dear Mr. Cunningham:
This letter transmits the surface water and groundwater data associated with the sampling of cement kiln dust
disposal area (C-Pit).This report includes data from the C-Pit ponded water and related groundwater
monitoring for the third quarter of 2016, covering the reporting period July 1, 2016 to September 30, 2oi6.
Table 1 presents data for the last four quarters.
For the third quarter of 2oi6, compliance monitoring, water samples were collected on August 30, 2016 from
CEM-oo1 and CEM 004 groundwater monitoring wells, and from the C-Pit ponded water. The initial inspection
of groundwater monitoring well CEM 005 on August 30, 2016, and the follow up inspection on September 7,
2016 indicated that there was not enough volume of water to collect a representative sample.
The samples collected from C-Pit ponded water and groundwater wells were analyzed for pH, chloride, sulfate,
total dissolved solids, selenium, and thallium.The reported pH data is based on the pH analysis performed at
the time of sample collection in the field (Table 1). The measured pH at groundwater monitoring well CEM-004
and analytical results for chloride, sulfate,total dissolved solids(TDS), selenium and thallium from the August
30, 2016 groundwater sample were within the target levels prescribed by TR-12, as shown in Table 1.
In addition, a Stiff Diagram of the groundwater cation/anion data from CEM 004 compared to go%of the
average cation/anion concentration in C-Pit is provided in Figure ifor reference. As shown in Figure 1,the
cation/anion signature for CEM-004 continues to be distinctly different from C-Pit, indicating there is no likely
evidence of C-pit leakage into the groundwater represented by well CEM-004.
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