| Abstract: | A map is presented that classifies the Coastal Plain of Fairfax County, Virginia according to the susceptibility of the principal sand aquifers to contamination from surface sources. The following classification is used: (1) areas where leachate can readily enter the principal sand aquifers, (2) areas offering great natural protection against migration of leachate into the aquifers, and, (3) areas where the contamination risk is uncertain and onsite investigations are needed. Approximately 20 percent of the area is in the high-risk category. The map is computer generated and was made by combining four source maps depicting those hydrogeologic factors related to movement of contaminants into the aquifers. These factors are (1) lithologic character of the upper 25 feet of sediments, (2) clay thickness above uppermost sand aquifer, (3) hydraulic gradient direction and head difference between water table and artesian head in principal aquifer, and (4) areal occurrence of moderate to high transmissiviry aquifers. The map is designed to be used by planners with little or no earth-science background, however, a technical discussion for hydrologists and geologists is also provided. (Woodard-USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 44086 |
| Citation Author: | Johnston, Richard H.; Van Driel, J. Nicholas |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 1 map. |
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| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 78-265 |
| Citation Search Results Text: | Susceptibility of coastal plain aquifers to contamination, Fairfax County, Virginia; a computer composite map; 1978; OFR; 78-265; Johnston, Richard H.; Van Driel, J. Nicholas |
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| Citation Year: | 1978 |
| Type: | citation/reference |
| Text: | Susceptibility of coastal plain aquifers to contamination, Fairfax County, Virginia; a computer composite map; 1978; OFR; 78-265; Johnston, Richard H.; Van Driel, J. Nicholas |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (PLATE): | http://pubs.usgs.gov/of/1978/0265/plate-1.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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