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Full-Text Articles in Engineering

Challenges With Sampling And Understanding Lead Corrosion Issues In Puerto Rico After Hurricane Maria, Melanie Rose Warren Jan 2019

Challenges With Sampling And Understanding Lead Corrosion Issues In Puerto Rico After Hurricane Maria, Melanie Rose Warren

Civil Engineering Graduate Theses & Dissertations

In January of 2018, an NSF RAPID project was launched to analyze the water quality in Puerto Rico after Hurricane Maria. More than 40 local drinking water taps were sampled over three sampling campaigns. This reconnaissance systematically included a collection of samples from publicly owned treatment systems (PRASA), privately owned systems operated by communities (non-PRASA), and unmonitored surface spring sources. The first sampling campaign was targeted towards gaining a holistic perspective of the water quality (e.g., bulk water quality parameters, nutrients, major ions, pathogens, DNA, disinfection byproducts (DBPs), and metals concentrations). However, elevated water lead levels in those initial ...


How Much Does Stream-Groundwater Exchange Influence Whole-Stream Metabolism In A Small Mountain Stream?, Erin Elizabeth Jenkins Jan 2019

How Much Does Stream-Groundwater Exchange Influence Whole-Stream Metabolism In A Small Mountain Stream?, Erin Elizabeth Jenkins

Civil Engineering Graduate Theses & Dissertations

The open-channel oxygen method quantifies rates of gross primary productivity (GPP) and ecosystem respiration (ER) by employing the diel dissolved oxygen (DO) curve. This attributes stream metabolism to four processes: photosynthesis, oxidative respiration, reaeration, and groundwater flux. Groundwater flux, however, is often assumed to be negligible, which may introduce bias in estimates of metabolism. To investigate this, whole-stream metabolism and groundwater flux were measured in Como Creek, Colorado during the summer of 2018. Results from the BASE (Bayesian Single-station Estimation) metabolism model indicate that periods of anoxic groundwater input result in an overestimation of ER in baseline simulations. These data ...


Evaluation Of A Heating Stove Changeout Program In The Navajo Nation: Pilot Study, Naomi Y. Chang Jan 2019

Evaluation Of A Heating Stove Changeout Program In The Navajo Nation: Pilot Study, Naomi Y. Chang

Civil Engineering Graduate Theses & Dissertations

Many homes on the Navajo Nation rely on wood and coal in old, inefficient heating stoves. An EPA-certified Navajo Hybrid Stove that can burn both wood and coal, was distributed to homes in the Navajo Nation. Collocation experiments were conducted to determine agreement among the DustTrak units and QTrak units. The correction factors and correlations for units of the same instrument were close to one; therefore, no adjustment to the data was necessary. A wood/coal smoke correction factor (W/CSCF) of 2.60 that is representative of wood/coal smoke exposure in Navajo homes was also determined for the ...


Water Quality Of Groundwater In Six Counties In Western Colorado: Evaluating Drinking Water Hazards And Developing Public Tools To Disseminate Well Information, Holly Ann Miller Jan 2019

Water Quality Of Groundwater In Six Counties In Western Colorado: Evaluating Drinking Water Hazards And Developing Public Tools To Disseminate Well Information, Holly Ann Miller

Civil Engineering Graduate Theses & Dissertations

Many residents in six counties on Colorado's Western Slope rely on privately owned groundwater wells as their primary source of drinking water. Because the water quality from these privately-owned wells is unregulated, these wells are often untested, which constitutes a risk to public health. To identify and address the risks to well owners, the West Central Public Health Partnership (WCPHP), recruited homeowners to sample and submit their well water for analyses. The WCPHP requested assistance and expertise to evaluate the hazards of drinking groundwater, and to develop ways to visualize the hazards to educate the public.

Well locations and ...


Radon In Colorado Springs, Co: Measuring And Modeling Before And After Weatherization Of Low-Income Homes, Tess Bloom Jan 2019

Radon In Colorado Springs, Co: Measuring And Modeling Before And After Weatherization Of Low-Income Homes, Tess Bloom

Civil Engineering Graduate Theses & Dissertations

The following thesis details an examination of radon and indoor environmental quality for low-income homes in Colorado Spring, Colorado. This investigation was completed in two parts: a field study and a modeling study. The main aim was to draw conclusions on the connection between weatherization and indoor radon concentration. Additionally, fine particulate matter (PM2.5), total volatile organic compounds (TVOCs), and mold and moisture were investigated before and after weatherization. From the field study, it was determined that there is no connection between weatherization and radon, PM2.5, TVOCs, and mold and moisture. Radon concentrations appears to vary ...


Hydraulic Fracturing Fluid Additives: Method For Detection With Mass Spectrometry, New Identifications, And Utility Of Biological Treatment, Kurban Andrew Sitterley Jan 2019

Hydraulic Fracturing Fluid Additives: Method For Detection With Mass Spectrometry, New Identifications, And Utility Of Biological Treatment, Kurban Andrew Sitterley

Civil Engineering Graduate Theses & Dissertations

Hydraulic fracturing simultaneously uses and generates billions of gallons of water every year that must be sourced and managed. Fracturing fluid chemicals, including many ethoxylated and propoxylated surfactants, are added to water to make fracturing fluid. Flowback and produced water, the primary contributors to the waste stream, are generated during the drilling operations and throughout the life of the well.

Inherent to developing a management approach is adequate methods of characterization and treatment for dissolved components. This research presents the development of a solid phase extraction method for identifying and detecting common fluid additives with mass spectrometry (MS). With this ...