down-hole-drilling hammer, you must “trip-out” all the2.drilled steel and flush all the mud and foreign materialbefore connecting the hammer. Air from an air3.compressor passes through the string of drill steel andexits out the down-hole-drilling hammer bit. This aircleans the cuttings from the bit and carries the cuttingsrecord an accurate record of the depth and changes inmaintain a log of formations penetrated andrepresentative samples obtained,determine the depth to each water level andobtain samples of water from aquifers.A Driller's Log, or well log, (fig. 9-5) is used toto the surface.formation along with a description of the samples-takenRegardless of the drilling method performed, theevery 5 feet or at every formation change. Also recordedobjectives of drilling are tois a description of the drilling action that is a valuableclue to a change in formation; for example, with the1. identify and locate the site of each testrotary method, drilling action in clay or shale is smooth.hole,Chattering of the bit is an indication of sand or gravel.Figure 9-5.-Driller’s Log.9-5
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