Chemical pollution has become an environmental and human health concern. Small and medium-sized enterprises are becoming the focus of environmental researchers, as they have been found to collectively contribute a significant amount of the pollution due to improperly managed chemicals. This case study of Nova Scotia small and medium-sized enterprises aimed to collect baseline information regarding environmental and chemical management including what positive practices were in place, what areas required more assistance, what information is being requested and who should be the focus of information programs. Results indicated that there is significant room for improvement in both the environmental and chemical management practices of small and medium-sized enterprises, even though participants indicated they were employing responsible practices. Participants were however, able to provide multiple suggestions regarding information they require in order to improve their business operations and environmental performance, thereby indicating they are aware improvements are needed.

This paper analyzes energy substitution rates on dairy farms in Nova Scotia (NS), Canada. A transcendental logarithmic cost function is used to find the elasticities of substitution which are utilized to determine the substitutability of total farm energy and to determine feasible renewable energy (RE) technologies. Wind turbines are found to be the only feasible RE technology for dairy farms within the region, at this time. A review of on-farm RE production and the associated feed-in tariff (FIT) policies in Germany, USA, Canada, Denmark and the Netherlands are examined. The NS FIT policy is used as a case study to assess the effect policies may have on wind turbine implementation by NS farms. Several scenarios are developed based on the existing policy structure to provide a critical review of the policy and to identify methods to provide an increase in the implementation of wind turbines on NS dairy farms.

This thesis proposes a network of small-scale architectural interventions to address a growing issue of youth substance abuse in rural Nova Scotia, Canada. Thorburn, a hub of a larger region of dispersed communities, acts as a testing ground for this proposal. An extensive system of trails and cabins currently provides both a means of transportation and informal, unsupervised gathering space for youth. Four test sites were chosen to represent a wide range of possible sites. Each exists at an intersection between these trails and the public realm. Each of these sites could not, on its own, sustain an active year-round program. On-site interventions are partnered with a mobile youth centre whose presence at each site is influenced by seasonal use and special events. Each site is modified to create flexible spaces whose function adapts to, but is not limited by, the presence of the youth centre.

Farming relies on the ecosystem services provided by biodiversity for production. Farming has been, however, responsible for habitat degradation and destruction, and consequently, biodiversity loss. At present, efforts to increase habitat on farmland are largely confined to voluntary programs. The effectiveness of the provincially delivered Agricultural Biodiversity Conservation (ABC) program was measured using a quantitative survey. Follow-up interviews during farm tours further explored qualitatively how farmers value biodiversity and biodiversity conservation on their land. Results from the survey quantitatively link ABC program participation to increased engagement in riparian management and modified harvesting activities. Qualitative results suggest that the motivation for engagement in biodiversity conservation stems from the farmers’ interest in preserving the balance between production and 'nature', thereby preserving what they perceive to be the health of their land. These results have implications for the improvement of the ABC program and of future stewardship program design.

This thesis addresses the revitalization of the former Nova Scotia Textiles Limited mill in Windsor, Nova Scotia, Canada. Windsor is a small town that lies along the confluence of the Avon and St. Croix River shores, off the Bay of Fundy, and is the gateway to the Annapolis Valley region. This abandoned textile mill serves as a monument in the landscape while also holding a special part in the identity of the town’s historic industrial past. This thesis proposes to establish a meaningful connection between the textile mill and the community, as well as with the phenomenal Fundy landscape by means of a regional interpretive center. Commercial, institutional and recreational facilities ensure year-round stability for the site. A context-based approach links the architectural intervention to the dynamic layers of building, site and tidal landscape beyond.

Materials are a significant aspect of architectural design, the construction components are selected for their availability, location, cultural meaning, physical characteristics and properties. The construction components are defined by their processes of fabrication and making. This thesis investigates processes of making utilizing local materials. It focuses on the relationship between raw material, fabrication, building application and spatial experiences. The proposed site is the former brickyard located outside Bridgetown, Nova Scotia, Canada. Material excavation, fabrication, and construction will all take place on-site. Through material studies, site strategies, and phased program development, it is hoped that an architectural language has been generated that successfully represents the potentials of developing underutilized locally sources material.

Anthropogenic and geogenic sources of arsenic (As) have been identified in mining-impacted soils from the Giant mine (1948-1999), NT and the North Brookfield mine (1886-1906), NS. Both used roasting to extract gold from the arsenopyrite ore, decomposing it to As-bearing iron oxides (roaster oxides or RO) containing As, and releasing As3+-bearing arsenic trioxide (As2O3). Arsenic trioxide is considered highly soluble with the dissolved As3+ species being more mobile and toxic than other oxidation states. Soil profiles from the Giant mine show elevated As and antimony (Sb) at the surface (As=140-3300ppm) and decreasing concentrations with depth (As=22-600ppm). Surface soils contain anthropogenically-derived As2O3 identified using synchrotron methods (µXRD, µXANES) and environmental SEM. The persistence of As2O3 is attributed to Sb in As2O3 grains, dry climate and high organics in the soils. Anthropogenically-derived RO of maghemite (containing both As3+ and As5+) and natural arsenopyrite were observed. Sequential selective extractions (SSE) from surface soils show between 20% and 75% of As extracted in the crystalline iron-oxide phase is attributed to As2O3 and RO, while at depth As is bound by organics in the weaker leaches. North Brookfield mine soils show lower total As (2ppm to 45ppm) except near the roaster (4300ppm). No As2O3 was identified, probably due to the smaller scale and age of the mine, lower organic content and the lack of Sb. As-bearing phases include RO of hematite (As5+), As-rich rims on titanium-oxides, and As associated with clays and goethite. Adjacent to the roaster, SSE show As was also in the amorphous iron-oxide phase, also shown by As in arsenopyrite weathering rims. There are many differences between the North Brookfield and Giant mine soils including roasting techniques which produced different RO mineralogy, the scale of mining, climate, soil type, and the presence of As2O3. Currently, the Giant property is not publically accessible but may become so in the future while the North Brookfield property is accessible. Understanding the form and distribution of As phases is critical because of the potential risk to human and ecosystem health associated with ingestion of soil particles and their control on the total dissolved As in surface and groundwater. / Thesis (Master, Geological Sciences & Geological Engineering) -- Queen's University, 2008-09-29 17:21:50.73

The current study developed a paleolimnological approach to assess changes in diatom assemblages (class Bacillariophyceae) from present-day lake sediments in comparison to those deposited before significant human impact (ca. pre-1850) from 51 Halifax (Nova Scotia, Canada) region lakes in conjunction with a regional diatom-based transfer functions for pH and total phosphorus. All 51 lakes showed changes in diatom assemblages between the present-day and pre-industrial assemblages that was greater than would be expected (i.e. similarity between ‘top’ and ‘bottom’ samples was much less than the similarities within triplicate ‘top’ and ‘bottom’ samples). To help identify the most important environmental stressors impacting diatom assemblages in these lakes, diatom-based reconstructions of inferred changes in pH (DI-pH) and total phosphorus (DI-TP) that were greater than the Root Mean Squared Error (RMSE) of the respective inference models were reconstructed for each of the 51 lakes. For example, a decrease in DI-pH greater than the RMSE of the pH model would be a strong indication of recent acidification, whereas an increase in DI-TP greater than the RMSE of the model indicates nutrient enrichment. Based on this approach, 4% of the lakes are showing acidification-related trends occurring in lakes with low pre-industrial pH values and relatively undisturbed watersheds. Almost 14% of the study lakes have been impacted by nutrients and characterized by watershed development and high concentrations of TP. Approximately 4% of lakes showed oligotrophication and acidification. Diatom assemblages from almost 20% of the study lakes that were relatively unimpacted by the afore-listed environmental stressors show trends consistent with climate warming. These lakes show an increase in DI-pH greater than the RMSE of the inference model, and floristic changes typically showed a decrease in the relative abundance of Aulacoseira distans paralleled with increase in Cyclotella stelligera and other planktonic diatoms in the modern sediments. In addition, Diatoma tenue and Diploneis parma, diatoms tolerant of high conductivity, increased in 45% of the study lakes suggesting road salt as an additional stressor. This thesis provides a rapid paleolimnological-based technique to assess regional water-quality changes, and further demonstrates the complexity of ecological changes within freshwater resources. / Thesis (Master, Biology) -- Queen's University, 2009-09-10 15:18:07.01

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