4.6. SR 11-13-2000 - Laserfiche WebLink

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- - - - ~ iS~~ I"-r \ I '\)\J \ . Llii3J:H LIESCH ASSOCIATES, INC. 13400 15TH AVENUE NORTH MINNEAPOLIS, MN 55441 763/559-1423 FAX: 763/559-2202 October 13,2000 Mr. Stephen Rohlf Building and Zoning Administration City of Elk River 13065 Orono Parkway Elk River, MN 55330 RE: September 2000 Groundwater Monitoring Results Old City Dump, Elk River, Minnesota Dear Mr. Rohlf: Enclosed are the laboratory results for the groundwater samples collected from the monitoring wells at the old City dump (MW-1, MW-2 and MW-3) and the Vandenberg and Hipsag residential wells that surround the dump (Figure 1). The sampling was completed on September 20,2000. The . Kirkeide and Brown residences no longer exist, thus were not sampled. A general overview of the September 20th data (Table 1) indicates that there was only one VOC detection for this sampling event. This detection was at MW-2 which identified 1,1,2,2- tetrachloroethylene at 1.6 parts per billion. No VOC's were detected in wells MW-1, MW-3 or the Vandenberg and Hipsag residential wells. Consistent with past data, groundwater flow direction was calculated to be southwesterly in direction towards the Mississippi River (Figure 2). Review of past water level data indicates that the water table at the site has steadily dropped 5 to 8 feet over the past 5 or 6 years. In summary, VOC concentrations at the monitoring wells are the lowest identified at the site since sampling initiated in 1989. 1,1,2,2-tetrachloroethylene in MW-2 was the only VOC detected this round of sampling. This concentration is below the Minnesota Department of Health (MDH) Health Risk Limit (HRL) for drinking water, and this compound has been only intermittently detected over the years at low levels. No VOC's have been detected in the Vandenberg and Hipsag wells to date. As in the past, we will provide the results of the private well testing to each individual residence upon your review of data. It is recommended annual monitoring continue at the site. Please call should you have any questions. .