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May 23, 2012 <br />Ms. Rebecca Haug <br />City of Elk River <br />Environmental Division <br />13065 Orono Parkway <br />Elk River, MN 55330 <br />RE <br />May 2012 Groundwater Monitoring Results <br />Old City Dump, Elk River, Minnesota <br />Dear Rebecca: <br />Enclosed please find the 2012 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 May <br />17, 2012 by Liesch Associates, Inc. (Liesch). Sample locations included monitoring wells MW-2 <br />and MW-3 near the former City dump site (Figure 2). <br />Laboratory results of the May 2012 sampling event (Table 1) indicate a low level VOC detection of <br />Tetrachloroethene (PCE) in MW-2. PCE was detected in MW-2 at a level of 1.2 micro grams per <br />liter (ug/L), an equivalent to parts per billion (ppb). No VOC's were detected in the sample <br />collected from MW-3. The results of the 2012 sampling event are consistent with historic low <br />concentrations found in groundwater samples collected from MW-2 and MW-3. <br />Historically PCE has been detected in MW-2 and Trichloroethene (TCE) has been detected in MW- <br />3. The VOC concentrations at the monitoring well locations (MW-2 and MW-3) have been <br />relatively stable over the last few monitoring events. TCE was not detected samples collected from <br />MW-3 for the May 2012 sampling event. In recent sampling events, TCE has not been detected in <br />MW-3 in the years 2005, 2007, 2009 and 2012. MW-3 TCE concentrations have been decreasing <br />since initial sampling conducted in 1989. PCE levels detected in MW-2 have remained relatively <br />static since 1989. PCE and TCE concentrations are currently below Minnesota Department of <br />Health (MDH) Health Risk Limits (HRLs) for drinking water. MDH HRLs for PCE and TCE are <br />currently set at 5 ppb. Based on information gathered during the 2012 sampling event it appears <br />that VOCs detected in the monitoring wells remains consistent with data from the last few years. <br />Please feel free to contact me at 763-489-3174 or John Lichter at 763-489-3120, should you have <br />any questions. <br />Sincerely, <br />www.liesch.com <br />LIESCH ASSOCIATES, INC. ^ 13400 15TH AVENUE NORTH ^ MINNEAPOLIS, MN 55441 ^ 763/489-3100 ^ FAX: 763/489-3101 <br />