Laserfiche WebLink
Perched Aquifer <br /> The Perched Aquifer is locally present in the lease area because of the presence of the Thirteenmile <br /> Creek tongue of the Green River Formation within the more permeable sandstones of the Uinta <br /> Formation. The Thirteenmile Creek tongue consists of more impermeable oil shale units, and <br /> groundwater is encountered in the Uinta Formation sandstones that immediately overlie the <br /> Thirteenmile Creek tongue. This aquifer is up to 20 feet thick, and it is encountered at a depth of <br /> approximately 530 feet on the lease area. In addition to the above-mentioned protection measures,the <br /> base of the Perched Aquifer is nearly 2,300 feet to a minimum of 1,900 feet above any anticipated OSR <br /> chambers. The downgradient monitoring well for the Perched Aquifer will be the existing MMC-IRI-1. <br /> A-Groove Aquifer <br /> The A-Groove Aquifer consists of fractured lean oil shale and marlstone of the Parachute Creek Member <br /> of the Green River Formation located immediately above the Mahogany Zone. The permeability of the <br /> aquifer is due to primary matrix porosity and secondary fracture porosity. The A-Groove Aquifer is <br /> encountered at approximately 1,375 feet below ground surface on the lease area. It is generally <br /> between 15 and 35 feet thick. In addition to the above-mentioned protection measures,the base of the <br /> A-Groove Aquifer is approximately 1,420 feet to a minimum of 940 feet above any anticipated OSR <br /> chambers. The downgradient monitoring well for the A-Groove Aquifer will be the 90-4. <br /> 8-Groove Aquifer <br /> The B-Groove Aquifer consists of lean fractured oil shale and marlstone of the Parachute Creek Member <br /> underlying the Mahogany Zone. The B-Groove Aquifer occurs approximately 1,565 feet below ground <br /> surface in the area of the NSHI RD&D Lease area. It is generally between 20 and 40 feet thick. In <br /> addition to the above-mentioned protection measures, the base of the B-Groove Aquifer is <br /> approximately 1,220 to a minimum of 740 feet above any anticipated OSR chambers. The downgradient <br /> monitoring well for the B-Groove Aquifer will be the 90-3. The existing BG-1 will serve as an upgradient <br /> monitoring well. <br /> Dissolution Surface Aquifer <br /> The Dissolution Surface Aquifer is present approximately 50 to 70 feet immediately above the top of the <br /> Saline Zone. In the vicinity of the NSHI RD&D Lease area,the Dissolution Surface Aquifer is found in the <br /> lean, fractured, brecciated, and rubblized oil shales and marlstones of the upper L-5 stratigraphic zone. <br /> Because of the proximity of the Dissolution Surface, solution features such as vugs, voids, pits, and <br /> rubble are common characteristics of the matrix material. The Dissolution Surface Aquifer occurs <br /> approximately 1,875 feet below the ground surface in the area of the NSHI RD&D Lease area. In <br /> addition to the above-mentioned protection measures, the base of the Dissolution Surface Aquifer is <br /> approximately 942 feet to a minimum of 462 feet above any anticipated OSR chambers. The down- <br /> gradient monitoring well for the Dissolution Surface Aquifer will be the DS-6 (to be constructed). The <br /> existing DS-2 will serve as an up-gradient monitoring well. <br /> Daub&Associates, Inc. Page 13 of 17 NSHI RD&D DRMS NO1 2014 <br />