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2016-07-13_PC_Agenda_Packet
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2016-07-13_PC_Agenda_Packet
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7/11/2016 4:10:15 PM
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Response Action Plan and Construction Contingency Plan June 10, 2016 <br />Attachment C <br />Former PIK Terminal, Roseville, MN <br />2.Area B –Southwest portion of the property. Primarily impacted with non- <br />petroleum compounds in soil and groundwater. The northern approximately <br />190 feet of Area B included a portion of the parcels that were sold to Calyxt. <br />Significant investigations on this portion of the area have identified only <br />petroleum impacts. <br />3.Area C –Southeast portion of the property. Primarily impacted with petroleum <br />compounds in soil and groundwater from two former underground storage tank <br />basins (LEAK# 1326). Soil impacted with petroleum-impacts remaining beneath <br />and around the former UST basins. <br />Based on the New Brighton, Minnesota USGS topographic map, the surface elevation of <br />the property ranges from approximately 910 feet above Mean Sea Level (MSL) on the <br />south side of the property to 930 feet on the north side of the property. No surface <br />water bodies are on the property, although Langton Lake is located less than 150 feet <br />north of Area C. <br />The 1992 Geologic Atlas of Ramsey County indicates that surficial geology in the vicinity <br />of the property consists of sandy lake sediments with fine to medium grained sand, silt, <br />and clay which is consistent with our field observations. <br />Bedrock is indicated to consist of fine grained dolostone and limestone of the Platteville <br />formation, underlain by thin, green sandy shale of the Glenwood Formation. The <br />Platteville is possibly overlain in places by the Decorah Shale. The bedrock surface is <br />expected to occur approximately 100 feet below ground surface (bgs). <br />The perched water table (shallow groundwater) is estimated to range from <br />approximately 10 to 20 feet deep. During the most recent investigations, groundwater <br />was encountered at a depth of approximately 10 feet in the south portion of the <br />property (Areas B and C). Four monitoring wells were recently installed on the property <br />and preliminary measurements indicate groundwater flow is to the north-northeast <br />which is consistent with investigations on adjoining properties. Based on recent borings <br />completed in the glacial aquifer, the depth to the glacial drift aquifer is about 55 feet. <br /> <br />The depth and gradient of the water table likely varies seasonally with changes in <br />precipitation, and may change significantly over time in response to development, <br />including impervious surfaces, storm water controls, and pumping wells (domestic, <br />industrial, or irrigation). <br />1.3 Prior Investigations <br /> <br />The larger PIK Terminal Site is listed on the following MPCA databases: <br />Leaking Underground Storage Tank (LUST) – Leak#1326 (Closed) <br />Voluntary Superfund – #SR387 (Active) <br />2 <br /> <br />
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