3.4. SR 08-08-2011 - Laserfiche WebLink

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REQUEST FOR ACTION To Item Number Ma or & Ci Council 3.4. Agenda Section Meeting Date Prepared by Consent August 8, 2011 Rebecca Haug, Environmental Administrator Item Description Reviewed by Annual Monitoring of Old City Dump Tina Allard, Ci Clerk Reviewed by Robert Thistle, Interim City Administrator ~ Action Requested Staff recommends the following: Annual monitoring continues until future. plans for the site are known or no VOCs are detected. Background/Discussion Liesch Associates, Inc. completed the yearly groundwater sampling on July 14, 2011. Samples were taken at monitoring wells MW-2 and MW-3 within the dump. The Vandenberg and Hipsag residential wells located west and southeast of the dump were not tested. The Kirkeide and Brown residences, formerly located south of the dump, no longer exist. MW-1, formerly located north of the dump, was sealed in 2002 when a parking lot for the city park was constructed in the area where the well was located. FINDINGS ^ Volatile Organic Compound (VOC) detections were at a low level in MW-2. Tetrachloroethylene (PCE) was identified at 1.4 parts per billion (ppb) in MW-2 (down from 1.6 ppb in 2010). The PCE level detected in MW-2 is consistent with historic low PCE concentrations. Low levels of Trichloroethene (TCE) were detected at MW-3. The TCE was identified at a level of 1.1 ppb (down from 1.4 ppb in 2010). TCE was not detected in 2009, 2007 or 2005 but has been historically detected since 1989 at decreasing levels. VOC concentrations at the monitoring well locations continue to be stable and consistent with previous samplings of these wells. The concentrations are below current Minnesota Department of Health (MDH) Health Risk Limits (HRLs) for drinking water. PCE and TCE levels axe currently set at 5 ppb. Attachments July 2011 Groundwater Monitoring Results for the Old City Dump -Tom C. Johnson, Leisch Assoc., Inc. -July 29, 2011 Action Motion by Second by Vote