Ground-Water Availability in the Atlantic Coastal Plain Aquifers of North and South Carolina

2008 S.C. Water Resources Conference - Addressing Water Challenges Facing the State and Regio

A GEOCHEMICAL APPROACH TO DETERMINE GROUND-WATER FLOW PATTERNS IN THE SIERRA VISTA BASIN, ARIZONA, WITH SPECIAL EMPHASIS ON GROUND-WATER/SURFACE-WATER INTERACTION

Water quality in the Sierra Vista Ground-Water Basin is of extreme importance due to the basin's unique ecosystem and predicted future population growth. Portions of the Upper San Pedro River, flowing through the Sierra Vista Basin, contain some of the few remaining perennial streamflows in the southwest. Baseflow in the perennial reaches of the river are maintained almost entirely by the regional and floodplain aquifer systems. A population increase is predicted for the Sierra Vista Basin, and an impact on groundwater quality and availability can be expected. Due to the closely linked hydrologic systems within the basin, contamination or depletion of the regional aquifer could have direct implications for the San Pedro River. Water samples were collected within the study area from the regional and floodplain aquifers, the San Pedro River, and a bedrock spring in the Huachuca Mountains. Samples were analyzed for field parameters, major-ions, and stable isotopes to describe the main chemical characteristics of the hydrologic systems within the basin. Analysis of regional aquifer geochemistry indicates a ground-water system strongly controlled by calcite precipitation. Specific conductance, deuterium and oxygen-18 values indicate a mixing of regional-aquifer ground water and San Pedro River surface water within the floodplain aquifer. Estimates of inflow to perennial reaches of the floodplain aquifer from the regional aquifer vary from 50 to 80%, depending on location. Inflow to the San Pedro River at Charleston from the regional aquifer is estimated to be about 50 to 70% of the stream discharge.Digitized from a paper copy provided by the Department of Hydrology and Water Resources

Groundwater Quality in the Upper Santa Cruz Basin, Arizona, 1998

Water-resources investigations report 00-4117. Ill. (some col.), col. maps. Includes bibliographical references

Sampling trace organic compounds in water: A comparison of a continuous active sampler to continuous passive and discrete sampling methods

• Continuous active sampling method was compared to continuous passive and discrete sampling methods. • Trace organic compounds in surface water were sampled by the three methods. • Continuous active sampling method detected the most compounds but at lower concentrations. • All three methods detected compounds across a wide polarity range. • Results were dependent on discharge, loading, compound type, and method performance. a b s t r a c t a r t i c l e i n f o A continuous active sampling method was compared to continuous passive and discrete sampling methods for the sampling of trace organic compounds (TOCs) in water. Results from each method are compared and contrasted in order to provide information for future investigators to use while selecting appropriate sampling methods for their research. The continuous low-level aquatic monitoring (CLAM) sampler (C.I.Agent® StormWater Solutions) is a submersible, low flow-rate sampler, that continuously draws water through solid-phase extraction media. CLAM samplers were deployed at two wastewater-dominated stream field sites in conjunction with the deployment of polar organic chemical integrative samplers (POCIS) and the collection of discrete (grab) water samples. All samples were analyzed for a suite of 69 TOCs. The CLAM and POCIS samples represent timeintegrated samples that accumulate the TOCs present in the water over the deployment period (19-23 h for CLAM and 29 days for POCIS); the discrete samples represent only the TOCs present in the water at the time and place of sampling. Non-metric multi-dimensional scaling and cluster analysis were used to examine patterns in both TOC detections and relative concentrations between the three sampling methods. A greater number of TOCs were detected in the CLAM samples than in corresponding discrete and POCIS samples, but TOC concentrations in the CLAM samples were significantly lower than in the discrete and (or) POCIS samples. Thirteen TOCs of varying polarity were detected by all of the three methods. TOC detections and concentrations obtained by the three sampling methods, however, are dependent on multiple factors. This study found that stream discharge, constituent loading, and compound type all affected TOC concentrations detected by each method. In addition, TOC detections and concentrations were affected by the reporting limits, bias, recovery, and performance of each method. Published by Elsevier B.V

Ground-water quality in the Upper Santa Cruz Basin, Arizona, 1998 /

Shipping list no.: 2001-0015-P."National Water-Quality Assessment Program."Includes bibliographical references (p. 32-34).Mode of access: Internet

Ground-water quality in alluvial basins that have minimal urban development, south-central Arizona /

Shipping list no.: 99-0271-P."National Water-Quality Assessment Program"Includes bibliographical references (p. 25-27).Mode of access: Internet

Ground-water quality in the Sierra Vista subbasin, Arizona, 1996-97 /

Shipping list no.: 99-0293-P."National Water-Quality Assessment Program."Includes bibliographical references (p. 38-39).Mode of access: Internet