The URL can be used to link to this page

Home My WebLink About1978-06-07 Septic System DesignJune 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. 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 drainfield site indicate that the water table is at a depth of -5.1' or greater. An "innovative shallow trench system" is recommended for the sec- ondary site. This system will allow for the required 3.0' separa- tion between the bottom of the drainfield and the water table. Soil borings indicated that the depth to the water table is 4.0' or greater. If you have any questions, please do not hesitate to contact me. Sincerely, EUGENE A. HICKOK & ASSOCIATES James P. DeBenedet, P.F. Enclosures 442, >' nE�T � P2oPa5E,D R-o� \ �ES7EIZ SrTE 1.1 F� GoE PY\ \ 47- + Z �OP.I-1 � o � ♦�P�- I 8 o Pyv- ++oak X SOIL &c -4 rel. PWF.lr f 3 - Z P.Gzf_ SES KEU,�' E.A. FNCKOK & ASSOCIATES JJA 197 Pczco l,-TIq►.I ?mST +kJL , -_iD" 3oiU r J L, HYDROLOGISTS - ENGNEERS x - -a,PTIo►JI1.5 f1P.f� M�IEAPOLIS-MINNESOTA �'�) TABLE 1 PERCOLATION RATES AND DEPTH TO WATER TABLE PARCEL 2 - (no lot) Percolation Rate Depth to Hole Material Percolation Rate Depth to Hole Material Minutes/Inch Water Table 1 Fine sandy clay 21.8 - 2 Clayey sand 5.0 - ' 3 Clayey sans 8.8 - 4 Clayey sand 8.3 - 5 Clayey sand 8.6 - 6 Fine sandy clay * 20.0 - 5.51(mottling at 4.0' Sbl * _ 6.01(mottling at 5.0' Sb3 * - 5.01(mottling at 4.0' Percolation rate of the primary field (holes 1, 2, 50 6) = 9.7 min/inch Percolation rate of the secondary field (2, 3, 4, 5) = 7.3 min/inch *See soil logs of soil bcring. PARCEL 3 - Percolation Rate Depth to Hole Material minutes/Inch e :'able y 2 .1v j'�: j Ju.aV Clayey sand •• 7.3 - 3 Clayey sand 10.0 -' 4 Clayey sand 10.9 5 Fi..e sandy clay 43.5 6 Clayey sand 5.5 - Sbl * - Greater than 8.0' (mottling at 6.5') Sb 2 * - 7.0'(mottling at 5.1' Sb3 * - 4.0 (mottling at 4.5' 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. TABLE 2 SOIL LOGS PARCEL 2 - SOIL BORING NO. 1 Depth (feet) Material 0.0 - 0.5 Dark gray sandy loam 0.5 - 2.1 Dark brown sandy clay 2.1 - 4.0 Brown clayey sand 4.0 - 6.0 Brown sandy clay, 3.0 - 3.5 mottled 6.0 - 8.0 Yellow brown silty 4.5 1.0 - clay, mottled Water table encountered at -5.5' SOIL BORING NO. 3 Depth (feet) Material SOIL 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 -5.0' 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 -5.0'. PARCLL. 3 - SOIL BORING NO. 1 Depth ( feet) 0.0 - 1.0 1.0 - 2.0 2.0 - 6.0 6.0 - 8.0 Material Brown sandy loam Yellow brown sandy clay Yellow brown clayey sand Yellow brown silty clay, mottling at -6.5' Water table not encountered within 8.0' of surface. SOIL BORING NO. 3 SOIL BORING NO. 2 Depth (feet) Material Depth 0.0 - 0.5 0.5 - 1.0 1.0 - 3.5 3.5 - 7.0 7.0 - 8.0 Material Brown sandy loam Brown silty clay loam Yellow brown silty clay, calcareous material Yellow brown sandy clay, mottling at -5.1 Yellow brown silty cla Water table encountered at -7.0'. Depth (feet) Material Depth (feet) 0.0 - 0.5 Brown sandy loam 3.0 - 3.5 0.5 - 1.0 Brown silty clay loam 3.5 - 4.5 1.0 - 3.0 Yellow brovin silty clay 4.5 - 6.0 6.0 - 8.0 Water table encountered dt -4.0'. Material Yellow brown sandy cl-ir Yellow brown silty cla Yellow brown sandy clay, mottling at -4.5 Yellow brown silty cla