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<br />c. Core Drilling <br /> <br />A typical drill rig is portable as it is mounted <br />on a truck and can be easily moved along the existing roads, <br />trails and open spaces, to reach the planned drilling areas. <br />It is not anticipated that any road cuts or construction will <br />be required for such access to the potential sites under con- <br />struction. <br /> <br />Exact drill locations will be selected in the field <br />to utilize existing clear areas if at all possible. As noted <br />below with regard to specific sites, drill hole locations will <br />be concentrated along the axes of potential dams and dikes, <br />with a limited number of holes at other facility locations. <br />Some locations may require limited cutting of trees and large <br />brush. The level space required for a drill is on the order <br />of 10 by 12 feet with surrounding area to place drill rods, <br />small water tanks, fuel drums, and miscellaneous equipment. <br /> <br />The engine used on the drill rig is usually a 4 <br />cylinder internal combustion type similar to that in a small <br />automobile. The engine on the water pumps are smaller air <br />cooled types. All engines are fitted with mufflers and spark <br />arrestors and are therefore relatively quiet. Experience <br />indicates that wildlife is not significantly disturbed by the <br />operations or noise. <br /> <br />The drill crew generally consists of two to three <br />people. Normally, drilling will be done during daylight hours <br />using one long shift (10 - 12 hours) or two shorter shifts when <br />there is sufficient light. Usually work will be restricted to <br />week days, however, time restraints or special requirements <br />could require six or seven day work weeks. It is contemplated <br />that drilling activities will be scheduled, commensurate with <br />weather and site conditions, to result in as expeditious a <br />program as feasible to achieve reliable results, with minimum <br />disturbance of the environment. <br /> <br />Generally, only water is used as a fluid for core <br />drilling. However, if drilling mud is required due to water <br />loss, REVERT would be used. RE\~RT is a non-toxic, harmless <br />drilling fluid that breaks down after 24 hours to an inert <br />material. REVERT is commonly used in most well drilling opera- <br />tions where the water is to be used for human consumption. <br /> <br />Upon completion of the drilling, the casing will be <br />cut nearly flush with the ground and a steel cap installed. <br />Capping the hole will allow re-entry into the hole if required. <br />All other materials will be removed from the drill site, the <br />ground surface re-contoured, and any scarified surface mulched <br />and seeded with appropriate vegetation as discussed later. <br /> <br />-5- <br />