_INSPECTION - C1981028 ‎(28)‎

• Permit No: C1981028
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 12/11/2008
• Email Name: JHB
• Media Type: D
• Archive: No

III. COMMENTS-COMPLIANCE
Below are comments on the inspection. The comments include discussion of observations made during the inspection. Comments also
describe any enforcement actions taken during the inspection and the facts or evidence supporting the enforcement action.
This was a partial inspection conducted by Janet Binns of CDRMS. Dan Kipp and Don MacDonald of Coors Energy
Company accompanied the inspection. The mine no longer extracts coal,but the remaining surface pit(Pit B)is permitted
to dispose of flyash. CEC caps,regrades,topsoils and seeds the pit as the ash fill progresses. The mine site was cool(upper
20's to mid 30's)with approximately 2 to 3 inches of recent snowfall.
Hydrologic Balance:.
The focus of this inspection was to observe 4 h quarter ground water monitoring well sampling. CEC samples 6 groundwater
wells quarterly. Well are FPW,DH-122,DH-96,AMW-1, SMW-2,and AMW-2. Discussion of sampling procedures are
found on permit page 56 and 57.
At the time of the.inspection Mr. Kipp had already sampled FPW and AMW-1. The inspector observed sampling of DH-96
and DH-122 in Ennis Draw. DH-96 is downgradient from the permit area. The well was capped when we arrived. CEC
collected initial waterlevel of 6.3' from the top of the well casing. The well casing is 1.3' from the ground surface,so the
water level was 5' from the ground surface. Casing is 5"in diameter. CEC bailed 5 times,then rinsed the sample bottle and
collected field parameters:
Field Parameters: pH=6.89 EC= 1.80 ms temp.=14.0°C
CEC dropped a pump into the well and pumped for 25 minutes. CEC has previously calculated the well volumes and the
amount of time required to evacuate 3 well volumes. After the 25 minutes of pumping the pump was removed and the water
level was remeasured immediately. Water level after evacuation was 11.8 ft. from the top of the casing(10.5ft.below ground
surface). CEC bailed 5 times,rinsed sample bottle with the 6"',collected water samples for field parameters and metal
analysis with the 7�'bailer volume and used an 8`h bailer volume to fill the inorganic sample bottle. Bottles were immediately
capped and put in a cooler. Field.parameters after evacuation were measured with the following results:
Field Parameters: pH=6.78 EC= 1.74 ms temp.=13.2*C
The well was capped and the inspection continued to DH-122. DH-1.22 is located in Ennis Draw upgradient from the Mine.
Adjacent to the access road it appears that a gas pipeline is staked for installation in support of the oil and gas activity in the
area.
DH-122 initial water level was 15.4' from the top of the well casing. Casing is 1.9"high according to page 57a in the permit.
On site observations are in agreement. The well was capped when we arrived.
Initial field parameters after 5 bailers were: pH=6.70 EC= 1.66 ms.... temp.=14.4'C
Water in the DH-122 well was evacuated with the submersible pump for 1.5 minutes,then.CEC collected water level(19.3'
from the top of the casing),and water samples as described for DH-96. Field parameters collected after evacuation were:
Field Parameters: pH=6.99 EC= 1.75 ms temp.=12.2'C
Analytical water samples are unpreserved. CEC delivers samples to Test America analytical lab in Arvada,CO.
Water sampling was consistent with the sampling procedure described in the permit. The inspector did not observe sampling
of the remaining 2 wells(AMW-2 and SMW-2),since the approved procedures were consistently observed.
The inspector observed a drill rig on one of the gas well pads drilled in 2008. CEC indicated that this is not a new location
but the gas company was reworking a previously drilled hole.