School of Civil and Environmental Engineering

Ph.D. Thesis Defense Announcement

Highway Runoff – Characterization, Stormwater Controls and Iron Oxide Coated Sands as Engineering Amendments in Sand Filter

By

Aditya Bhatt

Advisor:

Dr. Susan E. Burns (CEE)

Committee Members:

Dr. J. David Frost (CEE), , Dr. Jian Luo (CEE), Dr. Yuhang Wang (EAS), Dr. Glenn J. Rix (Geosyntec)

Date & Time: January 7, 2016 10:00am

Location: Sustainable Education Building, 122

Most highway and construction runoff originates from non-point or diffused sources. This runoff contains environmental pollutants, which

when transferred to sensitive receiving waters, can result in deterioration of receiving water quality and downstream aquatic habitat. Unlike

point source runoff such as industrial and sewage treatment plant discharge, which is comparatively easy to monitor, control and treat, nonpoint

source runoff needs to be extensively researched to characterize its constituents and properties. This allows determination of the effect

on receiving waters, in order to devise effective and economic techniques to contain or treat it. Commonly, stormwater controls or best

management practices (BMPs) are incorporated by agencies and state department of transportations to treat or contain highway runoff

depending on the purpose of a stormwater control. The work performed in this study consists of two parts: first, characterization of

stormwater runoff from an interstate highway in Georgia for comparison of conditions before, during, and after construction, and second

study of the field performance of a sand filter BMP, along with engineered amendments used for sorptive and thermal pollution control. In

the first part of this study, highway runoff quality in Georgia, within the GDOT right of way, was characterized. Furthermore, factors

affecting highway runoff quality were investigated. In-situ parameters were analyzed for temporal changes in water quality indicators. The

effect of construction runoff and highway runoff during construction or precipitation events can contribute to either acute or chronic pollution

of receiving water. In this study, the effect of construction runoff on a receiving stream was also investigated and compared with periods

during and after construction. Temporal analysis of stream water quality indicators was conducted using wavelets to observe the behavior of

stream water quality indicators at different temporal scales. In the second part of this study, a sand filter located in Georgia was studied for its

performance in reducing contaminants and compared with other sand filters in United States, with an emphasis on design parameters. Sand

filters, especially the ones with preceding sedimentation basins, perform well in removal of floatables, suspended solids and pollutants

associated with suspended solids. Additionally, the potential of using iron oxide coated sands as engineered amendments in sand filters was

tested as a means to enhance the BMPs performance in removing dissolved fractions of pollutants as well as diffusing thermal pollution.

Laboratory prepared iron oxide coated sands as simulants were used to study their thermal behavior and interaction with dissolved fraction of

metals.