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Impacts of individual on-site sewage disposal facilities on mountain valleys--Phase II--Water-quality considerations. Technical completion report, WRIP/371403 Item Info

A rapid increase in residential development utilizing primarily on-site sewage disposal systems is occurring in the Big Wood River valley in Idaho. This project evaluated the hydrologic characteristics of the Big Wood River and aquifer systems, addressing ground-water characteristics, ground-water/surface-water relationships, and water quality related to on-site sewage disposal systems. Ground water is unconfined and often occurs close to land surface in unconsolidated valley-fill deposits, which range from less than 40 feet to more than 180 feet in thickness. Ground-water underflow at Hailey was calculated to be approximately 40,000 acre-feet per year. A ground-water quality network of approximately 50 wells was established from which samples were collected in July-August, 1983. Approximately 20 wells were then selected from which samples were collected about every 6-8 weeks through March, 1984. The mean concentrations of nitrate-n, chloride, and orthophosphate were 0.53, 2.4, and .013 mg/L, respectively. Nitrate-n concentrations ranged from 0.1 to 2.2 mg/L, well below the USEPA recommended limit of 10 mg/L. The mean specific conductance was 371 micromhos/cm at 25� C. Mean concentrations of nitrate-n, chloride, and orthophosphate from surface-water samples were 0.44, 1.8, and .015 mg/L, respectively. Ground-water levels were measured in approximately 60 wells from which a water-table contour map and a ground-water/surface-water profile were constructed for July-August, 1983. The profile indicates hydraulic connection between ground water and surface water in much of the study area. Discharge measurements made in the Big Wood River and tributaries indicate the river gained approximately 156 cfs between Ketchum and Hailey in September, 1983, and gained approximately 84 cfs within the same reach in March, 1984. The river lost approximately 57 cfs between Hailey and Glendale Bridge in September, 1983.

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Title:
Impacts of individual on-site sewage disposal facilities on mountain valleys--Phase II--Water-quality considerations. Technical completion report, WRIP/371403
Authors:
Luttrell, S.P.; Brockway, C.E.
Date Created (ISO Standard):
1984-05
Description:
A rapid increase in residential development utilizing primarily on-site sewage disposal systems is occurring in the Big Wood River valley in Idaho. This project evaluated the hydrologic characteristics of the Big Wood River and aquifer systems, addressing ground-water characteristics, ground-water/surface-water relationships, and water quality related to on-site sewage disposal systems. Ground water is unconfined and often occurs close to land surface in unconsolidated valley-fill deposits, which range from less than 40 feet to more than 180 feet in thickness. Ground-water underflow at Hailey was calculated to be approximately 40,000 acre-feet per year. A ground-water quality network of approximately 50 wells was established from which samples were collected in July-August, 1983. Approximately 20 wells were then selected from which samples were collected about every 6-8 weeks through March, 1984. The mean concentrations of nitrate-n, chloride, and orthophosphate were 0.53, 2.4, and .013 mg/L, respectively. Nitrate-n concentrations ranged from 0.1 to 2.2 mg/L, well below the USEPA recommended limit of 10 mg/L. The mean specific conductance was 371 micromhos/cm at 25� C. Mean concentrations of nitrate-n, chloride, and orthophosphate from surface-water samples were 0.44, 1.8, and .015 mg/L, respectively. Ground-water levels were measured in approximately 60 wells from which a water-table contour map and a ground-water/surface-water profile were constructed for July-August, 1983. The profile indicates hydraulic connection between ground water and surface water in much of the study area. Discharge measurements made in the Big Wood River and tributaries indicate the river gained approximately 156 cfs between Ketchum and Hailey in September, 1983, and gained approximately 84 cfs within the same reach in March, 1984. The river lost approximately 57 cfs between Hailey and Glendale Bridge in September, 1983.
Subjects:
sewage systems community development waste treatment water quality
Location:
Big Wood River Valley
Latitude:
42.94
Longitude:
-114.79
Collection:
IWRRI
IWRRI number:
198408
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
wbv
Date Digitized:
2012

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Source
Preferred Citation:
"Impacts of individual on-site sewage disposal facilities on mountain valleys--Phase II--Water-quality considerations. Technical completion report, WRIP/371403", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-198408.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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