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153 N. Glendale

October 8, 2012
Our Geological Team recently completed the first phase of a Phase II investigation at our 153 N. Glendale site (Los Angeles/Glendale, CA). Our goal is to vertical characterize depth and lateral extent of soil contamination and determine the impact of any chemical contaminants upon ground water under subject property through representative sampling of soil and ground water from soil borings placed on-site as required by the Los Angeles County Fire Department, Health Hazardous Materials Unit (over site agency).Given the site’s contamination conditions, the Los Angeles County Fire Department requested that soil samples be collected to a total depth of 80’-100’ below surface grade in multiple locations. The entire area of this site is underlain by sedimentary rocks associated with the upper Miocene-age Punete Formation. There are also relatively shallow depths of this formation and so the requirements from Los Angeles County Fire Department, our Geological Team elected to use the Boart Longyear’s sonic drill rig to carry out this task.

Below is a description of Sonic Drilling taken from Boart Longyear’s website:

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Sonic DrillingSonic Drilling employs the use of high-frequency, resonant energy to advance a core barrel or casing into subsurface formations. During drilling, the resonant energy is transferred down the drill string to the bit face at various sonic frequencies simultaneously rotating the drill string evenly distributes the energy and impact at the bit face.When the resonant sonic energy coincides with the natural frequency of the drill string, resonance occurs. This results in the maximum amount of energy being delivered to the face.  At the same time, friction of the soil immediately adjacent to the entire drill string is substantially minimized, resulting in very fast penetration.Boart Longyear™ has been a forerunner of Sonic drilling since its early market acceptance 15 years ago. With our already advanced diamond core fleet able to face any challenging bedrock conditions, sonic was the perfect complement for overburden drilling. The ability to produce a continuous, in-situ sample at or near 100 percent recovery in almost any overburden formation without issues of refusal makes it the premium choice for shallow drilling.With a fleet of over 120 sonic rigs in operation world-wide, a dedicated R&D department, global manufacturing facilities and our Sonic University training program, it is fair to say that no one understands sonic drilling like we do.
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