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4.a) Ganzel comments re 16987 197th SSTS (2)Washingtm ��County 7/29/2014 Sherri Buss City Planner, TKDA 1500 Piper Jafray Plaza 444 Cedar St St Paul, MN 55101-2140 Department of Public Health and Environment Lowell Johnson Director Sue Hedlund Deputy Director RE: Cabin Reconstruction, Sewage System, 16987197th Street (Thompson/Holloway) While I don't have complete plans, the scope of the building reconstruction appears to involve more than 50% of the building value. Under Section 6.2 of the Washington County SSTS ordinance, a conforming (compliant) sewage system is required for this proposal. Based on a preliminary site visit, the system appears to be a very small, shallow gravity mound which likely does not have adequate separation to groundwater. For a project of this scope, a secondary system area should be identified. Seepage type wetland vegetation is on both sides of the creek flowing through the lot as well as in the vicinity of the existing mound, so a wetland setback variance will likely be needed for any replacement or secondary mound. Likely any SSTS design on the lot will be a type III system because of insufficient suitable soil. The potable water source is apparently a spring/stream box and pump which is likely influenced by the mound system and other surface water and should be abandoned and a new well installed. If you have any questions, call me at (651)430-6676 Sincerely, 61-71 &Zq-0? Pete Ganzel Senior Environmental Specialist Government Center • 14949 62nd Street North — P.O. Box 6, Stillwater, Minnesota 55082-0006 Phone: 651-430-6655 • Fax: 651-430-6730 • TTY: 651-430-6246 www.co.washington.mn.us Equal Employment Opportunity / Affirmative Action