T300 Urban Geochemistry

Wednesday, 28 September 2016
1:30 PM - 5:30 PM
Room 404

GEOCHEMICAL AND SOCIOLOGICAL STUDY OF BACKYARD WELLS IN UTAH VALLEY, UTAH

Paper number: T300-9
Program: Technical Sessions
Time: 3:45 PM – 4:00 PM

Authors

Abstract

Ferreira (2013) documented elevated concentrations of As and heavy metals in rivers that flow westward across the Wasatch Range and heavily-populated Utah Valley, Utah, to drain into Utah Lake, which is consistent with the history of unregulated mining in the watershed of Utah Lake. In Utah Valley it is not uncommon for urban residents to dig and maintain shallow (< 10 m) wells in their backyards, although the practice is illegal in Utah and unusual in urban areas outside of developing countries. Since the rivers in Utah Valley are losing streams, the question arose as to the levels of As and heavy metals in these shallow wells. The objectives of this study are to determine (1) the concentrations of contaminants in backyard wells (2) the pathways for shallow groundwater flow (3) why the urban residents of Utah Valley dig backyard wells. The objectives are being addressed by collecting water samples from backyard wells in Utah Valley and interviewing the owners of the backyard wells. Water temperature, pH, electrical conductivity, and dissolved oxygen are being measured on-site and water samples are being analyzed for nitrate, phosphate, sulfate, As, 11 heavy metals, and stable isotopes of hydrogen and oxygen. Chemical analysis of 107 backyard wells thus far has shown that EPA Drinking Water Standards are not met for Mn, As, Cd, Fe, Cu, Pb, and nitrate in 18.7%, 15.9%, 6.5%, 6.5%, 0.9%, 0.9%, and 0.9% of wells. Wells with elevated As and heavy metals tend to occur not near streams, but along the boundary between the groundwater recharge and discharge zones. According to a preliminary analysis of 80 interviews carried out with backyard well owners thus far, backyard wells are dug and maintained for emergency planning and for watering lawns and livestock, but not for gardens. Backyard well owners are conservative in terms of their social, political and religious attitudes, but are not survivalists or adherents to conspiracy theories. In fact, owners of backyard wells are no different than the mainstream of Utah culture, which suggests that backyard wells may be very common throughout the state. These findings raise the possibility that a state water policy that is backed by the public ought to include the promotion and legalization of safe water supply at the household level. Further results and interpretation will be presented at the meeting.

Geological Society of America Abstracts with Programs. Vol. 48, No. 7

doi: 10.1130/abs/2016AM-284388

© Copyright 2016 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.