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��� � <br /> ` , <br /> � � �� �.�� �, � � . �: ��� WENCK <br /> Sw�t,�r�t/v;i"". . ,� .f-. '� ... ..�. <br /> � s +s s • <br /> •�`�., 01.�r.,• . i . . � �t.i�6 .. ... .. - . . . <br /> Responsive partner. <br /> Exceptional outcomes. <br /> May 3, 2018 <br /> Roger Peitso <br /> Building Official, City of Orono <br /> 2750 Kelly Parkway <br /> Orono, MN 55356 <br /> Subject: Individual Sewage Treatment System (ISTS) Design. <br /> THIS DESIGN APPLICATION WILL REQUIRE A VARIANCE FROM THE CITY OF ORONO <br /> PROPERTY LINE SETBACK REQUIREMENTS. THE CITY WILL ADVISE THE OWNER IF A <br /> PROPERTY LINE SURVEY IS REQUIRED. <br /> 1. Legal Description - 300 Big Island; City of Orono; Hennepin County, Minnesota. PID <br /> 053-2311723320027. <br /> 2. Site Conditions - The approximately 0.25 acre parcel contains a two-bedroom, Class II <br /> dwelling as well as two storage sheds. Water service is via a private well. The site slopes <br /> toward Lake Minnetonka at a 5-10% grade. A new well has been drilled near the <br /> dwelling to allow for the required 50-foot well setback from the proposed septic <br /> drainfield in the rear of the yard. <br /> 3. Soil Conditions - The Hennepin County Soil Survey was reviewed prior to our site visit; <br /> the soil survey indicates the site is underlain by glacial till deposits. The property is <br /> mapped as the L22C2 Lester loam map unit. Soil investigations indicate the presence of <br /> clay loam subsoil at the proposed system depth of 24 inches. Clay loam soil has a <br /> recommended loading rate of 0.45 gpd/sqft. Hydraulic conductivity testing confirm the <br /> soil can accept a loading rate of 0.45 gpd/sqft, and the drainfield has been sized <br /> accordingly. Soil profile descriptions can be found in Appendix A. Hydraulic conductivity <br /> testing results are in Appendix B. The locations of the soil tests are found on Figure 1. <br /> The depth to seasonal saturation and/or bedrock was determined to be at or <br /> below 60" during a site visit with Roger Peitso on April 28, 2017. <br /> 4. Sizing of Treatment System - The ISTS is designed for a two-bedroom Class II dwelling; <br /> the estimated daily flow for this residence is 225 gallons. Soil loading rate is 0.45 <br /> gpd/sqft. Infiltrator Quick4 High Capacity chambers provide 12 inches of sidewall <br /> absorption area, which allows for a 20% reduction in the final bottom surface area of the <br /> trenches per MN 7080.2210 Subp 3(B). Final total bottom area is 420 sqft (minimum <br /> required bottom area is 400 sqft) divided into five 28-foot trenches. Each chamber is <br /> four feet long, and each.trench length must be divisible by four feet. A total of 35 <br /> chamber units will be installed. Sink and toilet fixtures need to be monitored closely to <br /> ---- , - - -----ensure proper operation. A leaking faucet or toilet can more than double the daily flow <br /> � _ . _____ _.to the ISTS and cause hydraulic failure. <br /> 5. Description of the Treatment Process - <br /> • Primary Treatment - Sewage is gravity discharged from the house to a septic <br /> tank. Natural biological activities taking place inside of the septic tank will <br /> separate solids and suspended particles. Solids are reduced to some extent <br /> through this process. <br /> Wenck Associates, Inc. � 1802 Wooddale Drive � Woodbury, MN 55125-2937 <br /> Toll Free 800-472-2232 MGin 651-294-4580 Email wenckmp@wenck.com !Neb wenck.com <br />