Laserfiche WebLink
<br />'. <br /> <br /> <br />t. <br /> <br />- <br />- <br />--- <br />- <br /> <br />LIE1CH <br /> <br />~ <br /> <br />HYDROGEOLOGISTS . ENGINEERS . ENVIRONMENTAL SCIENTISTS <br /> <br />JUL 0 5 Z007 <br /> <br />July 3, 2007 <br /> <br />Ms. Rebecca Haug <br />City of Elk River <br />Environmental Division <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />RE: June 2007 Groundwater Monitoring Results <br />Old City Dump, Elk River, Minnesota <br /> <br />Dear Rebecca: <br /> <br />Enclosed please find the 2007 annual water quality data for the Old Elk River Dump site located <br />southeast of the City of Elk River (Figure 1). The groundwater sampling was completed on June 7, <br />2007 by Liesch Associates, Inc. (Liesch). Sample locations included monitoring wells MW-2 and <br />MW-3 near the former City dump site (Figure 2). <br /> <br />MW -1 formerly located north of the dump was sealed in 2002 when a parking lot for the city park <br />was constructed in the area the well was located. Over ten-years of water quality monitoring at this <br />upgradient well location evidenced no detections ofVOC's so the well was not replaced. <br /> <br />Laboratory results of the June 2007 sampling event (Table 1) indicates a low level VOC detection <br />of 1,1,2,2-Tetrachloroethylene (PCE) in MW-2 at a level of 1.0 parts per billion (Ppb). No VOCs <br />were detected in MW-3. The PCE level detected in MW-2 during this recent sampling event is <br />consistent with historic low PCE concentrations. No VOC's were detected in the Vandenberg and <br />Hipsag residential wells. Water level data indicates that the water table at the site remains consistant <br />with water levels recorded over that last 7 years (attached Chart 1). Groundwater flow direction <br />could not be calculated as a minimum of three monitoring points are needed for this determination <br />and MW-l was sealed. Historic groundwater flow direction for the site has been southwesterly in <br />direction towards the Mississippi River. Presumably this was not changed. <br /> <br />The VOC concentrations at the monitoring well locations (MW-2 and MW-3) have been relatively <br />stable over the last few monitoring events. As indicated above, PCE in MW -2 was the only VOC <br />detected in this year's sampling event. PCB concentrations are below current Minnesota Department <br />of Health (MDH) Health Risk Limits (HRLs) for drinking water. <br /> <br />LIESCH ASSOCIATES, INC. . 13400 15TH AVENUE NORTH . MINNEAPOLIS, MN 55441 . 763/489-3100 . FAX: 763/489-3101 <br />