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campus on an average annual6asis. With an increase in student population to a total of 2,400 FTE students along with the associated jaculty and staff, the average monthly sewer usage is ezpected to increase to an approximate 1,690,230 gallons. This then assumes that 32,282,755 gallons will serve the 2, 400 FTE students along with the associated faculty and staff on an average annual basis. This is an approzimate increase in sewer usage of 33%. The recipient of that sewerage will be Arden Hills and Roseville. The increases are approximated to be evenly distributed beriveen the hvo cities based on the current proportion of sewer distribution to each city. b. Describe waste treatment methods or pollution prevention efforts and give estimates of composition after treatment. Identify receiving waters, including major downstream water bodies, and estimate the discharge impact on the quality of receiving waters. If the project involves on-site sewage systems, discuss the suitability of site conditions for such systems. The College does not treat or pre-treat sewage emanating from the campus. The ultimate receiving water of treated wastewater is the Mississippi River from the cities of Arden Hills and Roseville. Sewage from the campus flows into the citv se��er lines. There will be no direct impact on the receiving waters aside from the additional quantities of treated wastewater. The project does not involve on-site sewage treatment systems. c. If wastes will be discharged into a publicly owned treatment facility, identify the facility, describe any pretreatment provisions and discuss the facility's ability to handle the volume and composition of wastes, identifying any improvements necessary. All wastewater is conveyed to the Metropolitan Wastewater Treatment Plant by way of regional interceptors. There is no pre-treatment of any wastewater prior to discharge into the metropolitan system. The Metropolitan Wastex�ater Treatment Plant has adequate capacity to treat the additional guantity of wastewater. d. If the project requires disposal of liquid animal manure, describe disposal technique and location and discuss capacity to handle the volume and composition of manure. Identify any improvements necessary. Describe any required setbacks for land disposal systems. This is not applicable jor this project. 19. Geologic hazards and soil conditions a. Approximate depth (in feet) to ground water: 20 feet minimum 30 average Approximate depth (in feet) to bedrock: ]00 feet minimum 150 average Describe any of the following geologic site hazards to ground water and also identify them on the site map: sinkholes, shallow limestone formations or karst conditions. Describe measures to avoid or minimize environmental problems due to any of these hazards. The soils have a groundwater depth that is between 20 feet to 40 feet as shown in Attachment 19. The depth of bedrock ranges from approximately 100 feet to 200 feet as seen in Attachment 16. There are no known geological site hazards on the site including sink holes, shallow limestone formations, aba�tdoned wells, or kcrrst conditions. b. Describe the soils on the site, giving NRCS (SCS) classifications, if known. Discuss soil granularity and potential for groundwater contamination from wastes or chemicals spread or spilled onto the soils. Discuss any mitigation measures to prevent such contamination. Map Unit Approximate Symbol Map Unit Name Percent ofSite 1588 Zimmerman loamy ftne sand, 0 to 6 percent slopes 18.2 1 SSC Zimmerman loamy fine sand, 6 to 12 percent slopes 17. S 158D Zimmerman loamy ftne sand, 12 to 25 percent slopes 23.5 8598 Urban land-Zimnrerman complex, 1 to 8 percent slopes 0.5 P�,�; � v