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Assessing the Efficacy of Hydraulic Pumping as a Remediation Method of a Subsurface Light Non-Aqueous Phase Liquid Spill in Arroyo Grande, California
Get PDFThe efficacy of hydraulic pumping as a remediation method of a petroleum, or Light Non-Aqueous Phase Liquid (LNAPL) spill in Arroyo Grande, California will be assessed by determining aquifer properties, assessing the chemical properties of the contaminant, recovering the contaminant from the subsurface, and proposing alternative remediation techniques. Soil, groundwater and contaminant characteristics, cumulative volume of LNAPL skimming test data, pumping rates, and LNAPL thicknesses in wells installed within the contaminant plume were collected. Sediments around the LNAPL source are contaminated with hydrocarbons in the gas and diesel range. Pumping efficacy is expected to continue to decrease at the site, at which point alternate remediation techniques are evaluated. Skimming test data for each well reached an equilibrium discharge rate at approximately 60 minutes between discharges. Pumping rates in each well were variable with an average pumping rate of 20 gallons per week. LNAPL thicknesses in each well were variable, with maximum thicknesses of over seven feet and minimum thicknesses of less than two feet. Results from groundwater monitoring demonstrate that the plume is at low risk of migrating to neighboring properties. LNAPL testing and successful recovery progress of 6,169 gallons of LNAPL demonstrates that hydraulic pumping is an efficient first step towards containing the spread of the oil spill and removing the oil from the plume
Declan Galli Senior Recital
Get PDFThis is a recording of the repertoire from my senior recital performed on June 2, 2024. Paul Woodring served as the accompanist for this recording. Due to technical difficulties with the original recording, this recording was remade on June 6, 2024
A Comparison of Mass Timber Perceptions Among Construction Professionals Over Time
Get PDFMass timber is a relatively new construction building material consisting of large-scale engineered wood products such as cross-laminated timber (CLT) and glue-laminated timber (glulam). It is gaining attention as a sustainable alternative to traditional steel and concrete, offering benefits such as reduced carbon emissions and enhanced aesthetic appeal. Despite being used on notable projects recently, it is not yet widely accepted by the industry as a whole. This study investigates the evolving awareness, benefits, and challenges associated with mass timber construction among U.S. construction professionals. Through a survey of over 100 construction practitioners, primarily from Cal Poly’s Construction Management Advisory Council (CMAC) in California, this study provides updated insights on industry perceptions, particularly in comparison to Ahmed’s 2022 research on mass timber awareness. It was revealed that while both cost and experience remained as large challenges; 30% more respondents stated that material protection was a concern when working with mass timber. Additionally, 22% more respondents have had 1-5 years of experience working with mass timber. This indicates that as constructors gained more experience, the challenges have changed. This study allows the industry to identify current challenges and perceptions regarding mass timber, thus effectively able to adapt and change accordingly
