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' surface. However, organic drilling fluid additives will only be used with prior project GEOMATRIX <br /> manager approval. The drilling mud will be circulated into a settling tank or basin located <br /> ' near the boring. The viscosity of the drilling fluid will be assessed periodically by the driller <br /> and will be controlled throughout the drilling operation to achieve the required results (hole <br /> ' stability, sample return, and mud cake thickness along borehole wall). Only potable water will <br /> ' be used as makeup water for drilling fluid. Exploratory borings drilled using the hollow stem <br /> auger method generally do not require the use of drilling fluid. If required, potable water <br /> ' from a municipal supply will be used to maintain boring stability. <br /> ' The planned depth of each soil boring will be determined by the project manager before <br /> drilling. The Geomatrix field geologistiengineer will specify to the drill rig operator the depth <br /> ' of soil sample collection, method of sample retrieval, and other matters pertaining to the <br /> satisfactory completion of the borings. Geomatrix staff will observe the volume of drill <br /> ' cuttings returned to assess whether significant cavitation has occurred. Drill cuttings, unused <br /> soil samples, and drilling fluids generated during drilling of soil borings will be stored <br /> ' properly for future disposal by the client, unless other arrangements have been trade. <br /> ' The drill rods, augers, hoses, bits, and other components that fluids and cuttings contact will <br /> ' be steam-cleaned before drilling each boring, as well as at the beginning of each project and at <br /> the completion of field activities. Drive samplers will be cleaned with Alconox and water or <br /> steam-cleaned before each sampling event. Only potable water from a municipal supply will <br /> be used for decontamination of drilling equipment. Decontamination rinsate will be collected <br /> ' and stored properly for future disposal by the client. unless other arrangements have been <br /> made. <br /> DRILLING .SND DESTRUCTION OF SOIL 3ORINGS <br /> `.(SC?ROTO-DD.TNT REVTSION DAT': '.1ARCH 14-'I DD-1- <br />