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• <br /> Jeffrey L. Hammes <br /> Certified Soil Testing 820 Williamson St., #401 <br /> Certified Designing Madison, WI 53703 <br /> (608) 233-9200 <br /> Date: 8/25/2016 <br /> To: Plan Review- Private Onsite Wastewater <br /> Division of Industry Services <br /> Re: Gravity Flow At-Grade Component Equivalency For: Erik & Catherine Ranheim <br /> Location: NE1/4, SE1/4, Section 20, T7N, R6E, Town of Vermont, Dane County <br /> 1) The linear loading rate will not exceed 6 gallon per foot per day. <br /> 2)The minimum soil loading rate within the top 9 inches of in situ soil is 0.6 gallons/ft2 per day. <br /> 3) Recent similar plan approvals with an at-grade drainfield using gravity flow: <br /> Transaction ID Name <br /> 2061306 Harold Marzolf <br /> 2062308 Myron Dickau <br /> 2003321 Todd Hoesly <br /> 2003762 Mark Janssen <br /> 2009380 Art Post <br /> 2010222 Greg Timm <br /> 2019890 Jeff Peterson <br /> 4)A performance survey of gravity flow at-grade components in Grant County conducted by Duane <br /> Steiner(formerly of Dept. of Commerce) and Wilbur Austin (formerly of Grant County) indicated that all <br /> were not failing. At the time Wilbur Austin stated that there were over 400 gravity flow at-grade <br /> components installed in his county alone since 1985. (As of 10/1/2015 there are over 740 gravity flow at- <br /> grade drainfields in Grant County according to Grant County Wastewater Specialist Jeffrey Krueger. <br /> There were no reports of failures.) <br /> 5) A distribution box with access is to be used at the midpoint within the cell for flow monitoring. Dial-a- <br /> Flow plugs for D-box outlets shall be installed to regulate flows for equal distribution. Proper flow level <br /> shall be inspected every 13 months. <br /> 6) All surface flow of water is to be diverted away from the at-grade component with the finished grade. <br /> 7) The proposed basal area is 1000 ft2 for the four bedroom residence and will provide for treatment <br /> within the at-grade component.. <br /> 8) The original grade is less than or equal to 11 percent. The distribution cell follows the original grade <br /> contour. The downslope soil cover width is extended to 7 feet. <br /> 9)A two compartment septic tank of 1000 gallons and 600 gallons with effluent filter on the second-tank <br /> will improve effluent quality. <br /> Historical data indicates proper functioning of gravity flow at-grade components. There was no suitable <br /> site for a below grade drainfield found on the parcel for this residence. <br /> If yoq have any questions, please contact me at the above phone number. <br /> Je rey L. Hammes <br /> Certified Designer D1171, Certified Professional Soil Scientist 191-112 <br />