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CC_Minutes_2006_0320
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CC_Minutes_2006_0320
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7/17/2007 9:35:28 AM
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4/3/2006 10:28:07 AM
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Roseville City Council
Document Type
Council Minutes
Meeting Date
3/20/2006
Meeting Type
Study
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<br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />March 2006 <br /> <br />2 <br /> <br />053-2442 <br /> <br />Addition," also built as slab on grade, was erected sometime between 1974 and 1979. The Second <br />Addition adjoins the First Addition immediately to the west. <br /> <br />The site is underlain by lake sediment deposits, consisting of fine- to medium-grained sand with <br />minor amounts of silt and clay (Patterson, 1992). Based on review of well logs available for the area, <br />bedrock, consisting of Ordovician-age St. Peter Sandstone, occurs at a depth of approximately 100 <br />feet beneath the site. <br /> <br />Groundwater occurs at depths ranging from approximately three to 11 feet below ground surface <br />(Braun, 2005). Based on the apparent extent of VOC-affected groundwater beneath the site and the <br />suspected source area ofVOCs, it appears groundwater flows to the east-northeast. <br /> <br />1.3 Summary of Previous Investigations <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Six environmental investigations have been conducted at the site, the first of which was conducted <br />during 1992 and the most recent was completed during the fall of 2005. Brief descriptions of these <br />investigations and pertinent findings are described in the following sections. <br /> <br />1.3.1 UST Removal, Monitoring and Sampling (1992) <br /> <br />One 500-gallon and one 2,000-gallon underground storage tanks (UST) were removed from the <br />property during August of 1992. Both USTs were reportedly used to store No.2 fuel oil. The 500- <br />gallon UST was reportedly in poor condition at the time it was removed, and petroleum had been <br />released at the site. Approximately five cubic yards of petroleum-impacted soil were excavated and <br />the MPCA issued a closure letter for the leak attributed to the 500-gallon UST. A groundwater <br />sample collected from a depth of approximately seven feet below ground surface near the former 500- <br />gallon UST reportedly contained elevated concentrations (2,900 milligrams per liter) of diesel-range <br />organic compounds. <br /> <br />During November 1992, a groundwater sample was obtained from a three-inch diameter supply well <br />that was located within five feet of the former 500-gallon UST. According to District information, <br />the well was reportedly completed to a total depth of 88 feet below ground surface. The groundwater <br />sample was analyzed for a suite ofVOCs (Minnesota Department of Health List 465.D). It contained <br />detectable concentrations of VOCs, but at concentrations below Minnesota Department of Health <br />Recommended Allowable Limits (MDH-RALs). <br /> <br />I <br />I <br />I <br />I <br />l <br />I <br />I <br /> <br />According to Petroleum Tank Release Report filed for the two tanks, the 2,000-gallon UST was in <br />good condition when it was removed from the subsurface. <br /> <br />1.3.2 Water Well Sampling (1993) <br /> <br />An additional water sample was collected from the three-inch diameter supply well during July 1993. <br />The well was purged of an unknown quantity of water over the period of one week prior to collecting <br />the water sample. Analytical results for that water sample where similar to those measured in the <br />water sample collected the previous year, with VOCs measured at concentrations below MDH-RALs. <br />The supply well was subsequently sealed. <br /> <br />1.3.3 Soil and Groundwater Sampling (1997) <br /> <br />Four small diameter push probes were advanced near the former SOO-gallon UST basin during <br />January 1997 (probes P-l through P-4, Figure 2). Four groundwater samples and five soil samples <br />
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