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Home My WebLink About1978-06-07 Septic System Soil Boring ReportJune 7, 1978 Mr. Lester Kelly 125 South Brown Road Long Lake, Minnesota 55356 545 Indian Mound Wayzata, Minnesota 55391 (612)473-4224 Re: Percolation Tests for Subdivision Platting, Orono, Minnesota 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 and soil b.grings 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 minutes/inch. The percolation rate for the secondary field as tested was 7.3 minutes/ inch. The location of the percolation test holes, soil borings, and the proposed drainfield areas are indicated in Figure i. 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 drainfield sites indicate that the 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 and Lester loam. These soils are mapped in Figure 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, 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 Table 2. June 7, 1978 Mr. Lester Kelly Page Two A conventional septic system is recommended for the primary drain - field site provided that a 3' verticle separation is maintained be- tween the bottom of the'drainfield trenches and the water table. The soil borings taken at the primary urainfield site indicate that the water table is at a depth of -5.1' or greater. An "innovative shallow trench system" is ondary site. This system will allow for tion between the bottom of the drainfield Soil borings indicated that the depth to or greater. recommended for the sec - the required 3.0' separa- and the water table. the water takle is 4.0' If you have any questions, please do not hesitate to conta.t me, Sincerely, EUGENE A. HfI�CKOK & A/SSOCIATES James P. DeBenedet, P.E. JPD/3el Enclosures TABLE 1 PERCOLATION RATES AND DEPTH TO WATER TABLE PARCEL 2 - (No. lot) Hole Material 1 Fine sandy clay 2 Clayey sand 3 Clayey sand 4 Clayey sand 5 Clayey sand 6 Fine sandy clay Sbl the Sb2 3, 4, Sb3 = 7.3 Percolation Rate Minutes/Inch 21.8 5.0 8.8 8.3 8.6 20.0 Depth to Water Table 5.51(mottling rate at 4.0 6.0'(mottling 1, at 5.0 5.0'(mottling min/inch at 4.q Percolation rate of the primary field (holes 1, 2, 5, 6) = 9.7 sand min/inch Percolation rate of the secondary field (2, 3, 4, 5) = 7.3 min/inch *See soil logs of soil bcring. PARCEL 3 - Hole Material 1 Clayey sand 2 Clayey sand 3 Clayey sand 4 Clayey sand 5 Fine sandy clay 6 Clayey sand Sbl min/inch Sb2 Sb3 Percolation Rate Minutes/Inch 3.7 7.3 10.0 10.9 43.5 5.5 Depth to Water Table Greater than 8.0' (mottling at 6.5') 7.0'(mottling at 5.1') 4.0 (mottling at 4.51) Percolation rate of the primary field (holes 1, 2, 5, 6) = 6.5 min/inch Percolation rate of the secondary field (2, 3, 4, 5) = 11.5 min/inch *See soil logs of soil boring. FA TABLE 2 SOIL LOGS PARCEL 2 - Sol"'L BORING NO. 1 Depth (feet) 0.0 - 0.5 - 1.0 0.5 - 2.1 1.0 2.1 - 4.0 Yellow brown 4.0 - 6.0 Yellow brown silty 6.0 - 8.0 Material Dark gray sandy loam Dark brown sandy clay Brown clayey sand Brown sandy clay, mottled Yellow brown silty clay, mottled Water table encountered at -5.51 . SOIL BORING NO. 3 Depth (feet) Material SOII, BORING NO. 2 Depth (feet) Material 0.0 - 1.0 Dark gray sandy loam 1.0 - 2.2 Dark brown sandy clay, 2.2 - 3.8 Yellow brown clayey sand 3.8 - 8.0 Yellow brown silty clay, mottling at -5.04 Water table encountered at -6.0'. 0.0 - 1.0 Black sandy loam 1.0 - 4.0 Reddish brown fine sandy clay 4.0 - 4.8 Brown sandy .clay, mottling at -4.0' 4.8 - 8.0 Yellow brown silty clay Water table encountered at -5.01 . PARCEL 3 - SOIL BORING NO. 1 Depth (feet) Material 0.0 - 0.5 - 1.0 Brown sanLly loam 1.0 silty - 2.0 Yellow brown sandy clay 2.0 Yellow brown silty - 6.0 Yellow brown clayey clay, calcareous silty 6.0 - sand material 6.0 - 7.0 - 8.0 Yellow brown silty clay, clay, mottling at -5.1' mottling at -6.5' Water table not encountered within 8.0' of surface. SOIL BORING NO. 3 SOIL BORING NO. 2 Depth (feet) Material 0.0 - 0.5 Depth Brown sandy loam 0.5 - 1.0 silty Brown silty clay loam 1.0 - 3.5 3.5 Yellow brown silty Brown silty clay loam Yellow brown silty clay 3.5 - 4.5 - 4.5 6.0 clay, calcareous silty 6.0 - 8.0 material 3.5 - 7.0 Yellow brown sandy clay, mottling at -5.1' 7.0 - 8.0 Yellow brown silty clay Water table encountered at -7.0'. Depth ( feet) Material Depth ( feet) Yellow brown silty 0.0 - 0.5 Brown sandy loam 3.0 - 3.5 0.5 - 1.0 1.0 - 3.0 Brown silty clay loam Yellow brown silty clay 3.5 - 4.5 - 4.5 6.0 brown silty 6.0 - 8.0 Water t�ible encountered at -4.0'. Material Yellow brown sandy clay Yellow brown silty clay Yellow brown sandy clay, mottling at -4.5' Yellow brown silty clay GRASS COVER 12"- 18" LOAM SOIL BACKFILL OVER � AREA ij 1d�o'• ,7L— .. . �O' IC,' • r DRA1"SF L� • TRENCHES .. I ---AT UEAsr 4 viz ---i 0 R IGI,N,4L INTERCEPTOR OR CURTAIN DRAIN TO REMOVE EXCESS SOIL WAT E R n SOIL TREAT P E.NT UNIT USING SHALLOW TRENCHES AND CUkTAI)N DRAIN cRouln SURFACE