No description available.

The industrial history of the Great Lakes basin has left its mark on the landscape with more than 4,500 known hazardous waste sites on both sides of the Canada-United States border. The vast majority are closed and no longer accept wastes, but they still pose potential risks to the environment and nearby communities. For the past several years, state and provincial governments have proposed new "state-of-the-art" facilities as a way to allow industries continued access to waste disposal capacity, but with far stricter controls than most older sites have provided. Publicity of contamination incidents at existing waste sites, and also the institution of formal administrative reviews and public hearings for the location of new ones, have complicated the facility siting process considerably and led to the not-in-my-backyard (NIMBY) syndrome. Additionally, issues related to environmental equity and justice often arise, especially in cases where local residents are racial minorities or low-income (social equity). The problem also has a spatial dimension when one region is expected to receive wastes from, and for the benefit of, industries in other areas (spatial equity), or when a heavily industrialized community becomes slated for yet another facility (cumulative equity). Cross-boundary and local autonomy issues heighten the controversies as well. This thesis reviews ten hazardous waste siting disputes in communities on the Canada-U.S. border in terms of their environmental justice implications. In the majority of cases, opponents of new hazardous waste facilities based their concerns on spatial equity and a variety of procedural matters. Racial minority groups tended to base their arguments on cumulative equity rather than social equity. In some cases, local and regional disputes became international matters given the geographic setting along the Canada-U.S. border.

Thesis (Ph. D.)--University of California, San Diego, 1998. / Vita. Includes bibliographical references.

The objective of this study is to identify and examine potential mechanisms of radionuclide transport as vapor at a high-level radioactive waste repository located in unsaturated fractured rock. Transport mechanisms and processes have been investigated near the repository and at larger distances. Transport mechanisms potentially important at larger distances include ordinary diffusion, viscous flow and free convection. Ordinary diffusion includes self and binary diffusion, Knudsen flow and surface diffusion. Pressure flow and slip flow comprise viscous flow. Free convective flow results from a gas density contrast. Transport mechanisms or processes dominant near the repository include ordinary diffusion, viscous flow plus several mechanisms whose driving forces arise from the non-isothermal, radioactive nature of high-level waste. The additional mechanisms include forced diffusion, aerosol transport, thermal diffusion and thermophoresis. Near a repository vapor transport mechanisms and processes can provide a significant means of transport from a failed canister to the geologic medium from which other processes can transport radionuclides to the accessible environment. These issues are believed to be important factors that must be addressed in the assessment of specfic engineering designs and site selection of any proposed HLW repository.

Methodologies for estimating hydraulic and solute transport properties of unsaturated, fractured rock are developed. The methodologies are applied to networks of discrete fractures for the purpose of estimating steady fluid flow rates and breakthrough curves of entrained solutes. The formulations employ the boundary integral method to discretize the outer rim of each fracture and to solve a two dimensional flow equation within fracture planes. A three dimensional variant of the two dimensional boundary integral method is used to calculate flow through a permeable matrix with embedded permeable fractures. Exterior and interior surfaces are discretized using boundary elements to account for flow between fractures and the matrix, and between the matrix and fractures and the exterior boundaries. Synthetic fracture networks are created using planar fractures of finite areal extent embedded within a three dimensional rock matrix for the purpose of performing sensitivity studies of network hydraulic conductivity with respect to geometric parameters, such as fracture orientation and density. Results of the sensitivity studies show that: (1) The global hydraulic conductivity is linearly dependent on the product of fracture transmissivity and density for fractures of which fully penetrate the rock volume; (2) The effect of correlation between fracture length and transmissivity is to increase the global hydraulic conductivity; and (3) Results using a three dimensional coupled fracture— matrix flow regime compare favorably with analytic results. Flow through variably saturated fracture networks is modeled by assuming a constant capillary head within individual fractures. A free surface is found using an iterative procedure which locates nodal points at the intersection of constant total head and pressure head contours. The simulated free surface compares favorably with an approximate analytic solution and with laboratory results. Simulations indicate the presence of zones of water under both positive and negative pressure, as well as regions of air—filled voids. Travel times and breakthrough curves are determined by integrating the inverse velocity over a streamline, and then summing over all streamlines. For the fracture network examined, travel times decrease with decreasing fracture saturation. The effects of retardation and matrix diffusion are also examined.

An analysis was performed of a Texas gulf coast hazardous waste injection well disposal system. The system was complicated by the presence of a fault which transected the injection interval. The existence of the fault presented the potential for enhanced vertical migration of the injected solutes via a tortuous path of interconnected, highly permeable sand units. Evaluation of this potential necessitated a fully three dimensional model which incorporated the arrangement of the alternating shales and sands and their associated discontinuities. Computer run time and memory limitations compelled a dissection of the problem into components, as well as the utilization of a specific mixture of conservative and realistic assumptions. The analysis indicated that within 10,000 years, the waste would advance vertically no further than one hundred feet into the overlying stratigraphy, and laterally no further than 24,000 feet from the point of injection.

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 261-272).

Thesis (Ph. D.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains ix, 160 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 102-107).

No description available.

Thesis (M.P.A.)--Kutztown University of Pennsylvania, 1992. / Source: Masters Abstracts International, Volume: 45-06, page: 2938. Abstract precedes thesis as 3 preliminary leaves. Typescript. Includes bibliographical references (leaves 95-100).