Laserfiche WebLink
• <br />• <br />U <br />Table i. Vibrating Wire Piezometer Locations <br />Piezometer <br />ID Borehole <br />ID <br />Northin <br />Eastin Elevation <br />tt <br />General Location <br />VWP-Ol BG05-Ol 19351 37846 6 030 Eastern Side Interior Refuse Pile <br />VWP-02 B <br />2 1 <br />7 7 <br />1 6 011 M <br />i <br />ti <br />t <br />l I <br />t <br />i <br />R <br />f <br />Pil <br />Al <br />S <br /> <br />VWP-03 G05-0 930 3 <br />63 <br />6 026 ax <br />mum <br />on <br />Cen <br />ra <br />n <br />er <br />or <br />e <br />use <br />ong <br />ec <br />e <br />VWP-04 BG05-03 19287 37355 6 048 Western Side Interior Refuse Pile <br />VWP-05 BG05-06 18991 37824 5 991 Central Refuse Pile Alon Maximum Section at Toe <br />Pore pressure monitoring of the piezometers is presented in Figure 1. The initial peak and <br />sudden decrease in pore pressure observed shortly after installation is due to curing of the <br />grout around the pressure transducer. Pore pressures subsequently increased over the year to <br />year and a half following installation. The increased pore pressure is attributed to loading of <br />the waste bank (due to placement of coal mine waste) faster than the pore water could <br />dissipate. However, after this initial increase, pore pressures are observed to dissipate. <br />Dissipation is observed in VWP-05 (located at the toe of the waste bank) and VWP-02 (located <br />near the bottom of the coal mine waste profile at the interior maximum section) a few months <br />after installation and have maintained relatively steady around 1 to 3 psi since. These pore <br />pressures correspond to approximately 2 to 7 feet of head, which are considered low. These <br />values demonstrate that pore pressures are dissipating. <br />Bowie No 2 2008 Reevalution of Coal Mine Waste Stability.doc <br />Project #OS-126-GEO <br />Page 5 of 15 <br />