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1 <br />Area of Disturbance and Topsoil Salvage <br />Initial Seoen Locations <br />The anticipated acreage of disturbance and topsoil salvage <br />' associated with drill pad construction is a total of 1.6 acres. <br />This 1.6 acres is based on seven locations at 100 feet by 100 <br />feet. In addition, a maximum of .2 acres of access corridor <br />' might require topsoil salvage (assuming a fourteen foot width, <br />100 feet long). Again, It is the intention to access the sites <br />without stripping topsoil if ground conditions allow. This <br />' practice will aid in minimizing surface disturbance. <br />Additional Eleven Locations <br />The anticipated acreage of disturbance and topsoil salvage <br />associated with drill pad construction of the additional proposed <br />eleven locations is a total of 2.5 acres. This 2.5 acres is <br />based on eleven locations at 100 feet by 100 feet. In addition, <br />a maximum of .9 acres of access corridor might require topsoil <br />salvage (assuming a fourteen foot width, 100 feet long). As <br />previously stated, approximately 9,700' of access will be <br />required to sites PDH-1, PDH-3, PDH-5, and PDH-15. The access to <br />these sites will encompass a maximum total of 1.5 acres. The <br />' total area of disturbance f~o~,the additional eleven proposed <br />locations and accesses is.G=~ acres. Again, it is the intention <br />to access the sites without stripping topsoil if ground <br />' conditions allow. This practice will aid in minimizing surface <br />disturbance. <br />' Groundovater Aquifers <br />As previously mentioned, groundwater aquifers will be penetrated <br />' during drilling. The significant bedrock aquifers of the area <br />are the Twentymile Sandstone and the Trout Creek Sandstone. <br />Other minor local aquifers do occur and consist of thinly <br />' interbedded, very fine to fine grained sandstones, siltstones, <br />and coal beds. These minor aquifers are generally laterally <br />discontinuous and have low and variable water yields.2 <br />' In the event that artisan flow is encountered during the drilling <br />activities, the water from the hole will be routed to the mud <br />pits. In the event flows can not be easily handled via the use <br />' of mud pits, the hole will be mudded using a low-sodium bentonite <br />product, with any excess water being transported by a vac-truck <br />to a permitted disposal site. In addition to the above water <br />handling contingency plans, each hole will contain steel surface <br />zWilliams Fork Tract Profile, Bureau of Land Management, <br />1982. <br /> <br />