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June 7, 1978 Mr. Lester Kelly 125 South Brown Road Long Lake, Minnesota 55356 ke t4 r 545Indian Mound ; Wayzata, Minnesota 55391 (612) 473.4224 Re: Percolation Tests for Subdivision Platting, Orono, Minnesota Job Number 2.1-78-25 Dear Mr. Kelly: Enclosed is infer. • requested in regards to the suitability of Parcels 2 and 3 for on -site sewage treatment. The drainfield information is based on percolation tests and soil borings performed on May 23, 24, and 25, 1978. Parcel 2 The soils found on Parcel 2 are Glencoe silty clay loam, Hamel loam and Lester loam. These soils are mapped in Figure 1. The p, >>_a- tion rate for the primary field as tested was 9.7 minutes/int The percolation rate for the secondary field au tested was 7.3 minutes/ inch. The location of the percolation test holes, soil borings, and the proposed drainfield areas are indicated in Figure 1. Percolation rates and depths to the water table are shown in Table 1. The soil logs of the soil borings are showy. in Table 2. An "innovative shallow trench system" or a mound system is recommend- ed for both the primary and secondary drainfield sites. These sys- tems will allow for the required 3.0' separation between the bo-tom of the drainfield and the water table. The soil borings `aken at the primary and secondary drainfield sites indicate that tree: water table is at a depth of 4.0' or greater. I have enclosed an eleva- tion view of such a system. Parcel 3 The soils found on Parcel 3 are Glencoe silty clay loam, Hamel loam "nd Lester loam. These soils are mapped 4n Figure 1. The percol-- tion rate for the primary field as tested Was 6.5 minutes/inch. the percolation rate for the secondary field as tested was 11.5 minutes/ inch. The location of the percolation test holes, soil 1,orings, and proposed drainfield areas are indicated in Figure 1. Percolation rates and depths to the water table are shown in Table 1. The soil logs of the soil borings are shown in Tabl- Z.