| Abstract: | Since 1960 chloride concentrations in the El Dorado aquifer have increased near El Dorado, Arkansas. The aquifer is a major source for municipal and industrial water supply in Union County. Greatest withdrawal occurs near El Dorado. Because of this withdrawal, the potentiometric surface at El Dorado has been lowered more than 300 feet. Geologic, hydrologic, and chemical data indicate that water from a graben south and east of El Dorado is the source of contamination from salt within the El Dorado aquifer. The data indicates that surface brines and deeper aquifers are not the sources of chloride contamination. Lowering the potentiometric surface near El Dorado has caused water to move out of the graben toward El Dorado. Estimates based on interpretation of electric logs for two wells in the graben indicate chloride equivalents may be as high as 2,500 milligrams per liter in the aquifer. Concentrations outside the graben range from 130 to 650 milligrams per liter at the west end of the graben and from 25 to 150 milligrams per liter farther west and north. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 26360 |
| Citation Author: | Broom, Matthew E.; Kraemer, T. F.; Bush, William V. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | - |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | v, 47 p. :ill., maps (some folded) ;28 cm. |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey, Water Resources Division, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 84-4012 |
| Citation Search Results Text: | A reconnaissance study of saltwater contamination in the El Dorado aquifer, Union County, Arkansas; 1984; WRI; 84-4012; Broom, Matthew E.; Kraemer, T. F.; Bush, William V. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | A reconnaissance study of saltwater contamination in the El Dorado aquifer, Union County, Arkansas; 1984; WRI; 84-4012; Broom, Matthew E.; Kraemer, T. F.; Bush, William V. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1984/4012/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1984/4012/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, Water Resources Division, |
