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REQUEST FOR ACTION <br />TO <br />ITEM NUMBER <br />City Council <br />3.8. <br />AGENDA SECTION <br />MEETING DATE <br />PREPARED BY <br />Consent <br />September 7, 2010 <br />Rebecca Haug, Environmental <br />Administrator <br />ITEM DESCRIPTION <br />REVIEWED BY <br />Old City Dump <br />REVIEWED BY <br />ACTION REQUESTED <br />Staff recommends the following: <br />■ Annual monitoring continues until future plans for the site are known or until no Volatile <br />Organic Compounds (VOCs) are detected. <br />BACKGROUND/DISCUSSION <br />Liesch Associates, Inc. completed the yearly groundwater sampling on June 14, 2010. Samples were taken <br />at monitoring wells MW -2 and MW -3 within the dump. The Vandenberg and Hipsag residential wells <br />located west and southeast of the dump were not tested. The Kirkeide and Brown residences, formerly <br />located south of the dump, no longer exist. MW -1 formerly located north of the dump was sealed in 2002 <br />when a parking lot for the city park was constructed in the area where the well was located. <br />Findings <br />■ Volatile Organic Compound (VOC) detections were at a low level in MW -2. <br />Tetrachloroethylene (PCE) was identified at 1.6 parts per billion (ppb) in MW -2. The PCE <br />level detected in MW -2 is consistent with historic low PCE concentrations. <br />■ Low levels of Trichloroethene (TCE) were detected at MW -3. The TCE was identified at a <br />level of 1.4 ppb. TCE was not detected in 2007 or 2005 but has been historically detected <br />since 1989 at decreasing levels. <br />■ VOC concentrations at the monitoring well locations continue to be stable and consistent <br />with previous samplings of these wells. <br />■ The concentrations are below current Minnesota Department of Health (MDH) Health Risk <br />Limits (HRLs) for drinking water. PCE and TCE levels are currently set at 5 ppb. <br />ATTACHMENTS <br />■ June 2010 Groundwater Monitoring Results for the Old City Dump —Tom C. Johnson, Leisch <br />Assoc., Inc. —August 19, 2010 <br />Action Motion by Second by Vote <br />C:\Documents and Settings\XPMUser\Local Settings\Temporary Internet Files\OLK66\Action Requested-10.doc <br />