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Elk River Station EAW <br /> <br />September 6, 2002 <br /> <br />The Elk River Station development is estimated to produce approximately 127,136 gallons of <br />wastewater per day, which is eight percent of the plant's current capacity. Because the WWTP <br />has adequate treatment capacity for [he additional wastewater, treatment capacity issues are not <br />anticipated. <br /> <br />d) If the project requires disposal of liquid animal manure, describe disposal technique and location and <br /> discuss capaciO: of handle the volume and composition of manure. Identify any improvements necessary. <br /> ' Describe any required setbacks for land disposal systems. <br /> <br />The project will not include facilities that generate liquid animal manure requiring disposal. <br /> <br />19. Geologic Hazards and Soil Conditions <br /> <br />Appro.¥imate depth (in feed to ground~'ater: 0 <br />Approximate depth (in feeO to bedrock: 1 O0 <br /> <br />minimum 16 average <br />minimum 160 average <br /> <br />Describe any of the following geologic site hazards to ground water and also identifi.; them on the site map: <br />sinkholes, shallow limestone formations or karst Conditions. Describe measures to avoid or minimize <br />environmental problems due to any of these hazards. <br /> <br />No known geologic hazards in the form of sinkholes, faults, shallow limestone formations, and <br />karst topography are present on the project site. Measures to avoid or minimize environmental <br />problems due to these hazards are not proposed. <br /> <br />Depth to groundwater was estimated by calculating the difference between the water table <br />elevation and the surface topography. Braun Intertec prepared a Report of Geotechnical <br />Evaluation in December 2000 and supplemented it in September 2001. The December 2000 <br />report indicated that water was not encountered during soil boring advancement. Based on the <br />measured cave-in depths and.the evaluation of moisture contents apparent in the penetration test <br />samples, the groundwater could be within 10 to 20 feet of the ground surface, with corresponding <br />elevations of 875 and 878, respectively. Some soil borings completed in September 2001 were <br />located adjacent to the wetland, and groundwater was encountered between one and five feet <br />below grade, with corresponding elevations of 878 to 880, respectively. <br /> <br />According to the Anoka Sand Plain Regional Hydrogeologic Assessment (Minnesota Geological <br />Survey, 1993), the water table contour is 875 feet above mean sea level.(msl). Two-foot <br />topographic mapping indicates elevations on the site range from 880 to 902, and exist mostly <br />between 888 and 894 feet msl. Thus, depth to groundwater averages 16 feet. Because surficial <br />groundwater is sometimes encountered in the wetland, the minimum depth to groundwater is <br />estimated at 0 feet. <br /> <br />Depth to bedrock was determined from Geologic Map of Minnesota: Depth to Bedrock (Minnesota <br />Geological Survey, Map S-14, 1982). <br /> <br />Page 12 W West'wood Professional Services, Inc. <br /> <br /> <br />