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to 6 inches in diameter to depths up to 200 feet. The holes <br /> are then filled with charges which are detonated and <br /> subsequent shock waves recorded. The recorded data shows, <br /> in technical terms, a profile of the earth's stratum, which <br /> is an aide for oil discovery, research, and development. <br /> The holes left by the drilling are filled with a slurry mix <br /> of bentonite pellets or other type of material . Since <br /> nothing is left in these holes in the form of any type of <br /> improvement, as determined earlier in Section 7026, a <br /> contractors license is not required. <br /> The chief concern of a geophysical drilling operation such <br /> as this one, is the preventing of contaminated waters of <br /> one aquifer to mix with another aquifer. <br /> The Board shares your concern in this area as Ism sure most <br /> People do. However, precautions at the local level by way <br /> of site inspections will have to suffice until legislative <br /> changes come about. <br /> If you have any questions, or comments you can reach me at <br /> (916) 366-5207 . <br /> Sincerel <br /> ichard Reed <br /> License Classification Deputy <br /> RR/jlm <br /> cc: Department of in ustrial Relations <br /> Department of He lth <br /> Department of water Resources <br /> Robert c. Faber, Attorney, Faber and Associates <br /> Ronald Foster, Associated Drilling Contractors Assoc. <br /> board of Geology <br /> Board of Registered Engineers <br /> Chevron Oil Corporation, Mike Moes <br /> ✓Mike Moes, Chevron Oil Corporation <br />