1978-06-07 Septic System Design - Laserfiche WebLink

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June 7, 1978 Mr. Lester Kelly 125 South Brown Road Long Lake, Minnesota 55356 Re: Percolation Tests for Subdivision Platting, Orono, Minnesol:� Job Number 11-78-25 Dear Mr. Kelly: Enclosed is information requested in regards to -the suitability of Parcels 2 and 3 for on-site sewage treatment. The drainfield information is based on percolation tests AtA T".. 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 percola- tion rate for the primary field as tested was 9.7 ^._r.:t� ",'i-.�!1. The percolation rate for the secondary field as tested was 7.3 minutes/ Lae proposed draintielu areas are indicated in riy re 1. Percolation rates and depths to the water table are shown in Table 1. The soil logs of the soil borings are shown 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 bottom of the drainfield and the water table. The soil borings taken at the primary and secondary draii)lield sites indicate that the water table is at a depth of 4.01 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, Hartel loar; an,] Lester loam. These soils are mapped in Fiqure 1. The percola- 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 borings, an(: proposed drainfield areas ares indicated in Figure 1. Percolation rates and depths to the water tables are shown in Table 1. The soil loqs of the soil borings are shown in Table 2.