| Abstract: | A geohydrologic investigation was performed by the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, to determine the distribution of volatile organic compounds in a fractured-rock aquifer near the Southeast Rockford Groundwater Contamination Site in Rockford, Ill. The geologic units of concern are the St. Peter Sandstone and Glenwood Formation; the dolomites of the Platteville and Galena Groups of Ordovician age; and the sands, gravels, silts, and clays of Quaternary age. The hydraulic units of concern are the unconsolidated aquifer, composed of sand and gravel; the fractured- dolomite aquifer, composed of the Galena and Platteville Groups and the dolomitic sections of the Glenwood Formation; and the sandstone aquifer, composed of the St. Peter Sandstone and the sandstone beds in the Glenwood Formation. The dolomite aquifer is well connected hydraulically to the overlying unconsolidated aquifer and the underlying sandstone aquifer. Caliper and acoustic-televiewer logs show several subhorizontal fractures in the dolomite that can be correlated throughout the study area. Comparison of televiewer and flowmeter logs indicates that most of the flow in the dolomite aquifer is through these fractures. Ground-water flow through two of the fractures can be correlated over large parts of the study area. Volatile organic compounds, in concentrations exceeding 2,000 micrograms per liter, were detected within the entire thickness of the dolomite aquifer where flow is measurable. Volatile organic compounds were detected in an area of the aquifer where they were thought to be absent in previous investigations. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 27986 |
| Citation Author: | Kay, R. T.; Prinos, S. T.; Paillet, F. L. |
| 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: | iv, 28 p. :ill., maps ;28 cm. |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey ;
USGS Earth Science Information Center, Open-File Reports Section [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 93-4187 |
| Citation Search Results Text: | Geohydrology and ground-water quality in the vicinity of a ground-water-contamination site in Rockford, Illinois; 1994; WRI; 93-4187; Kay, R. T.; Prinos, S. T.; Paillet, F. L. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Geohydrology and ground-water quality in the vicinity of a ground-water-contamination site in Rockford, Illinois; 1994; WRI; 93-4187; Kay, R. T.; Prinos, S. T.; Paillet, F. L. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1993/4187/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1993/4187/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
USGS Earth Science Information Center, Open-File Reports Section [distributor], |
