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- A list of ecological receptors of concern and an evaluation of potential <br />pathways. <br />Tnhlc 1\/ Rd _ Rcrontnr Pnthwnv Fvnh intinn <br />Receptor Soil Pathway Groundwater Pathway <br /> Groundwater is not expected <br /> to be impacted by surface <br /> Surface soils have been impacts above 5 feet bgs as <br />soils in the upper 5 feet are <br />Surface Soil impacted by slurry displaced predominantly clay and <br /> into the SHT. appear to have impeded <br /> vertical migration of <br /> contaminants. <br /> Limited subsurface soil Groundwater is expected to <br /> impacts are expected beyond be impacted where the SHT <br />and incomplete slurry wall <br /> the SHT and incomplete slurry was excavated below 6 feet <br />Subsurface Soil wall as the upper5 feet are <br />predominantly clay and bgs. Soils in the vadose and <br /> appear to have impeded saturated zone are <br />predominantly sands, gravels <br /> vertical or lateral migration of and cobbles with high <br /> contaminants. permeability. <br /> Groundwater is expected to Groundwater is expected to <br /> be impacted where the SHT be impacted since the pipeline <br /> and incomplete slurry wall is located approximately 17 <br /> was excavated below 6 feet feet bgs and groundwater is <br />Groundwater bgs. Soils in the vadose and approximately 12 feet bgs. <br /> saturated zone are Groundwater was immediately <br /> predominantly sands, gravels impacted at the time of the <br /> and cobbles with high release. <br /> permeability. <br /> There is the potential for <br /> The St. Vrain River is not impacts to the St. Vrain River <br />as is appears the groundwater <br />Surface Water expected to have been <br />impacted by soils as aquifer in the area of the <br />(St. Vrain River) contaminants were well pipeline release are in <br />However, <br />. <br />communication <br /> contained by soils the slurry to <br />flow appears <br />groundwater <br /> excavation and SHT. the to the north or away from <br /> the river <br /> There is the potential for There is the potential for <br /> impacts to the quarry ponds impacts to the quarry ponds <br /> as it appears the groundwater as it appears the groundwater <br />Surface Water aquifer in the area of the aquifer in the area of the <br />(Quarry Ponds) pipeline release are in pipeline release are in <br /> communication. Groundwater communication. Groundwater <br /> flow appears to be northerly flow appears to be northerly <br /> toward the quarry ponds. toward the quarry ponds. <br />15