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2014-04-18_REPORT - C1996083
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2014-04-18_REPORT - C1996083
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Last modified
8/24/2016 5:43:14 PM
Creation date
4/18/2014 10:20:01 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
Report
Doc Date
4/18/2014
Doc Name
1st Quarter 2014 Wastebank Report
From
J.E. Stover & Associates
To
DRMS
Permit Index Doc Type
Waste Pile/Fill Report
Email Name
SLB
SB1
Media Type
D
Archive
No
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readings at VWP -05 have remained generally stable with a range from 3.6 to 2.0 psi <br />since March of 2006. Current pore pressure on March 17, 2104 was 2.0 psi. <br />VWP -06: Installed on June 5, 2009, VWP had an initial pressure of 11.3 psi. We <br />recorded a spike of 16.2 psi in our March 14, 2013 monitoring report which is consistent <br />with the additional storage of coal waste near the VWP -06 site at that time. Since that <br />time, VWP -06 has shown a steady decline in pore pressures to its most recent reading of <br />14.8 psi. This indicates that the upper Pile #2 slope near VWP -06 is experiencing <br />anticipated dewatering. Pore pressures are expected to increase slightly if additional coal <br />waste is added to the slope near the VWP -06 site, but again, pore pressures would be <br />expected to decrease as the pile dewaters and reaches equilibrium. <br />VWP -08: Also installed on June 5, 2009, VWP -08 had an initial pressure reading of 12.2 <br />psi and a peak of 15.0 as reported on December 21, 2009. That peak, as with VWP -06, <br />was coincident with the addition of coal waste near the VWP -08 site: By March 2010 the <br />peak pore pressures at VWP -08 had dropped and have remained steady with a range of <br />13.9 to the current reading of 12.6 psi. <br />VWP -09: This VWP was installed on May 18, 2012 to provide an additional analysis point <br />near the toe of CDWA #2. After an initial reading of 1.5 psi, VWP -09 has remained <br />generally stable with the latest reading at 1.4 psi. These readings are indicative of a <br />generally stable slope with consistent pore pressure indicating mostly complete <br />dewatering. The area around VWP -09 is generally in its final grading state and over time <br />the pore pressures are expected to remain constant or slightly decrease as the area near <br />VWP -09 reaches its equilibrium state. <br />VWP -10: Also installed on May 18, 2012, VWP -10 had an initial reading of 0.6 psi and a <br />current reading of 0.5 psi. Like VWP -09, the area surrounding VWP -10 is not expected to <br />receive any additional gob and is awaiting final reclamation. Pore pressures are expected <br />to stabilize following that reclamation at or near their current readings. <br />Pore pressures at the active VWP locations are anticipated to continue to decrease as <br />drainage occurs. Upward spikes in pore pressure occur in locations where gob is either <br />temporarily stored prior to spreading and compacting or where the pile has received <br />additional coal waste as it is built upward. In our analysis we look at those spikes and <br />monitor the trend in reading after the spikes. In all cases, the VWP's have recorded <br />declining pore pressures following those spikes. <br />In any event, on -going monitoring of all piezometers is recommended to monitor pore <br />pressure responses to the on -going refuse placement. Otherwise, the measured pore <br />pressures are consistent with the revised stability evaluation for the coal refuse <br />performed by BGI (2008). <br />Site Visit Observations <br />During our site visit on March 17, 2014, with Mr. Ron Grimland, no gob stockpiling was <br />being performed at CWDA No. 2. It is our understanding that, due to winter conditions, <br />2014- 1st quarter Monitoring Report PN #05- 126 -GEO <br />April 2, 2014 <br />Page 3of6 <br />
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