Blasting Results

Print

(Updated May 7, 2014)

Below are the results of the blasting seismograph and dam seepage monitoring. The information will be updated as new data becomes available. On some days there may be no blasting or just one blast.

 

Seismograph Monitoring

The Division of Safety of Dams (DSOD) requires that the peak particle velocity (PPV) or intensity of the blasting is limited to 2 inches per second at the dams (S-01 & S-02). Additionally, at the nearest homes, the PPV is limited to 0.5 inches per second, the level at which cracking of plaster or drywall might occur. NT or “not triggered” means that the PPV is below the 0.05 inches per second detection limit of the seismograph.

Click here for the location of the seismographs (PDF - 170KB).

Seismograph Monitoring Table (click on Blast ID to watch a video of the blast)

Seismograph Monitoring, Peak Particle Velocity (in/sec)
 Blast ID Date Time  S-01 S-02   S-03  S-04 S-05  S-06 
T1 4/21/2014  12:28  NT NT  NT  NT  NT NT
T2 4/21/2014 13:30 NT 0.095  NT  NT  NT NT
PS-1 4/22/2014  14:25  NT NT  NT  NT  NT NT
PS-2 4/23/2014 15:07 0.078 NT  NT  0.084  NT NT
PS-3 4/24/2014 13:04 0.075 NT NT  0.076  NT NT
TEX-1 5/05/2014 13:35 NT NT NT NT NT NT
TEX-2 5/07/2014 12:32 0.077 NT NT 0.09 NT NT
TEX-3 5/09/2014 15:36 0.073 NT NT 0.081 NT NT
TEX-4 5/16/2014 13:56 0.164 NT NT 0.102 NT NT
TEX-7 5/19/2014 12:50 0.069 NT NT 0.062 NT NT
TEX-5 5/20/2014 14:41 0.138 NT NT 0.147 0.073 NT
TEX-6 5/22/2014 12:20 NT NT NT 0.058 NT NT
TEX-8 5/27/2014 14:41 0.114 NT NT 0.064 NT NT
TEX-11 5/28/2014 14:24 0.082 NT NT 0.081 0.064 NT
TEX-9 5/30/2014 14:33 0.096 NT NT 0.074 NT NT
TEX-13 6/02/2014 13:15 0.098 NT NT 0.012 NT NT
TEX-10 6/04/2014 14:10 NT NT NT NT NT NT
TEX-12 6/05/2014 11:57 0.08 NT NT 0.119 0.07 NT

* Blast ID designations are not sequential; they identify specific blasts that were pre-planned for the site.   

 

Dam Seepage Monitoring

The DSOD also requires that dam seepage monitoring is performed daily, before and after blasting activities. Seepage is normal; all dams have some seepage as the impounded water seeks paths of least resistance through the dam and its foundation. Seepage only becomes a concern if it is carrying material with it. During monitoring, the clarity of the water is observed and the rate of flow is measured.

Click on the map for seepage monitoring locations (PDF - 874KB).

Seepage Monitoring Table  

 Location
   Saddle  Easterly  Perch  Main
Date  Time  Flow (gpm)  Condition Flow (gpm)  Condition Flow (gpm)  Condition  Flow (gpm) Condition
4/21/2014 6:50 2.22 Clear 0.25 Clear 0.92 Clear 3.00 Clear
4/21/2014 15:55 2.20 Clear 0.26 Clear 0.90 Clear 2.87 Clear
4/22/2014 14:50 2.29 Clear 0.25 Clear 0.91 Clear 2.84 Clear
4/23/2014 15:15 2.28 Clear 0.24 Clear 0.88 Clear 2.83 Clear
4/24/2014 13:15 2.28 Clear 0.24 Clear 0.87 Clear 2.87 Clear
5/05/2014 13:35 2.28 Clear 0.18 Clear 0.83 Clear 2.91 Clear
5/07/2014 13:05 2.28 Clear 0.18 Clear 0.85 Clear 3.75 Clear
5/09/2014 15:40 2.26 Clear 0.19 Clear 0.85 Clear 5.25 Clear
5/16/2014 14:15 2.39 Clear 0.13 Clear 0.91 Clear 2.82 Clear
5/19/2014 12:50 2.33 Clear 0.13 Clear 0.89 Clear 2.94 Clear
5/20/2014 14:50 2.34 Clear 0.13 Clear 0.89 Clear 2.91 Clear
5/22/2014 12:40 2.25 Clear 0.16 Clear 0.79 Clear 2.90 Clear
5/27/2014 15:00 2.14 Clear 0.12 Clear 0.88 Clear 2.90 Clear
5/28/2014 14:40 2.18 Clear 0.12 Clear 0.87 Clear 2.83 Clear
5/30/2014 14:45 2.20 Clear 0.12 Clear 0.86 Clear 2.94 Clear
6/02/2014 13:15 2.29 Clear 0.11 Clear 0.84 Clear 2.79 Clear
6/04/2014 13:00 2.19 Clear 0.10 Clear 0.84 Clear 2.90 Clear
6/05/2014 12:30 2.29 Clear 0.11 Clear 0.84 Clear 2.80 Clear

 

 

Free viewers are required for some of the attached documents.
They can be downloaded by clicking on the icons below.

Acrobat Reader Flash Player QuickTime Windows Media Player Microsoft Silverlight Word Viewer Excel Viewer PowerPoint Viewer

Navigation

View Full Site