From: | "Laura Olah" <olah@speagle.com> |
Date: | 09 Apr 1997 17:06:10 |
Reply: | cpeo-military |
Subject: | Natural Attenuation/groundwater/metals |
I'm making inquiries on behalf of residents near Fort McCoy in Wisconsin, where 10 areas within the facility have high levels of metals contaminated groundwater. The principal groundwater contaminant is lead, and to a lesser degree: Arsenic, Beryllium, Chromium, Cadmium and Antimony. Lead levels in groundwater range from 6.2 ppb (ug/l) to 1,250 ppb. (The groundwater enforcement standard in Wisconsin is 15 ppb for lead.) Soils are extremely sandy; the groundwater table is quite shallow; in most areas between 6 and 10 feet below the surface. The facility is located in the LaCrosse River watershed; protection of nearby surface water resources is a strong community concern. The proposed remedial technologies for treatment of metals contaminated groundwater (at 9 of out 10 sites) is natural attenuation. Question: Does anyone know of sites where groundwater contamination (metals) has been reduced to below enforcement standards using natural attenuation as the sole treatment? If so, what were the original groundwater contaminant levels at this site/s and how long did it take for groundwater standards to be met? A point of contact for the site would be very helpful. Thanks so much for your help! Laura Olah | |
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