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Home My WebLink About1982-11-15 Septic System Design ReportFOR "OPKINS CONSTRUCTION, INC. 1PLR- JL 11 E�>rv, 98,5 1 loco t000 GAL Gni. P"''o SE�TrC Sit>iv S-1 EL.- 1MV. EL.994.0 ZuV, Et. 983.E 1►J v . Et, . X183,3 1D\el C t4o—% %C) SC At" Vo QC£. . �!A -SIT E k EEV3GE Y12�F�t t�Et� ` SYS T ENS Loi 4 t "3 LE; , I Co ll �� T �>— Y Si 0 C �' - Ck�ECI. Vj11-/E , IF 1lJS i A�C.t.t, S (�J.�I_A �3C W 1TN;�J t kiL "MoutJr,'� LU �R_E.vc_�, � F2EC.L'.r_>G G:- "FpCtGc- 1-i��•I►J �U;:frJ L--\ C Yl^ 1 to ✓ �1,) 'Pu I P IUG STA—, NA[La L AT C.CAST "Pum;- :�TI•.tz�T,. �� ,� r U r1i' ---ro.p„ ✓ :i.� _ � Sc srf'��l_ E CAP Lt ; �' A r3 o v ri pd G qtr ►.� l . r -t 2 ►1 lc;� o S ✓ \�G x:.11 A (� U C,-, J i C� V_ 1 T U r,� i`_ T A ILS S 5 P&-C_t �IChrco W v L 'V N C. " O u0 S Q.X-1R[?--r-:-0JTrc);fcP Ttit=_ OP_oC) SATF- % WR'i Nt.�� --,-t L'�StC�� tllAL" �!A -SIT E k EEV3GE Y12�F�t t�Et� ` SYS T ENS Loi 4 t "3 LE; , I Co ll �� T �>— Y Si 0 C 177.6 x _ _ ... 251♦. 30 S B`�Sl ��' r ... _ _ .. M.o EXH,3- TO: Jeanne A. Mabusth, Zoning Administrator FROM: Michael 11. Gaffron, Septic System Inspector DATE: November 6, 1981 SUBJECT: #654 Dicon, Willow Drive South - Subdivision I have reviewed the submitted r(,r,rt for the above referenced proposed subdivision, and _ make the following comments: The report by Borg indicates high -water -table soils throughout the 6 lots tested. Lot 1 - Slopes of 8%, 10i. Percolation rates at a depth of 25" - 31" averaged 10 mpi in the primary site and 23 mpi for the alternate site. Both sites are acceptab' for standard mound systems. Lot 2 - Slopes of 4-6s in areas tested. Percolat,,jn rates averaged 25 mpi in the primary site and 13 mpi in the alternate site. Bot'1 sites are acceptable for standard mound systems. Lot 3 - Slopes of 5% - 6% in areas tested. Average percolation rates averaged 27 mpi for the primary site, and 34 mpi in the alternate site. Both sites are acceptable for standard mound systems. Lot 4 - Slopes of 3-4% in areas tested. Percolation rates averaged 41 mpi in primary site and 20 mpi in the alternate site. Both site: are acceptable for standard mound systems. Lot 11 - Slopes of 8-10% in areas tested percolation rates averaged 40 mpi in the primary site and 31 mpi at the alternate site. NOTE: CARE MUST BE TAKEN TO PLACE TETE MOUND ON A SLr,PE OF 6% OR LESS ON THIS LOT. Lot 10 - Slopes average 6%. P( --solation rates averaged 48 mpi on the primary site and 87 mpi on the alternate site. General Comments: Percolation testing was done at a range of depths from 13" to 31". No real correlation appears to exist between depth of testing and percolation rates. The soil borings reflect a seasonably saturated zone beginning at a a range of depths from 1.2 ft to 2.5 ft. Actual current perched water tables were found on some sites at a depth of 3.5 ft. or greater. Based on the above data, the site evaluations recommendation for all mound systems is appropriate. I confirmed the soil boring report wit]-, a boring of my own. Two additional comments are necessary: 1 - Enough sand should be placed above the surface soil to maintain a 3' separation between the shallowest mottled zone and the bottom of the rock bed in the mound. On some sites this will mean 2' of sand should be placed. 2 - In all cases, mound placement should be at the most level spot available in the natural topography in the area tested. I recommend approval of the subdivision, with the further stipulation that during road construction the drainfield sites remain totally undisturbed. TO: Jeanne A. Mabusth, Zoning Administrator FROM: Michael P. Gaffron, Septic System Inspector DATE: June 14, 1982 SUBJECT: 0654 Dicon, 151, Willow Drive South - Additional On -Site Testing I have reviewed the submitted soil and site evaluation for the two lots on the north side of the road in Phase 1. Testing indicates average perc rates varying from 1 to 48 mpi, with high water tables (saturated zones) in all but the most northeasterly site. Mound systems are applicable for all these sites, although the northern site for Lot 1, Block 1, could support a shallow trenzh system. I note that Lots 2, 3 and 4 in Block 2, have been realigned. By superimposing the previous testing over the new lot lines, it is apparent that 2 of the 6 perc tests originally done on Lot 4 are now on Lot 3. Technically, additional testing should be done within the boundaries of the revised Lot 4. However, since the soils appear to be fairly consistent throughout the division, and since mounds will be used on all the lots, this minor additional testing is not critical and may be waived until a house is proposed for the site. I will reiterate that mounds should be placed on the most level sites within the tested areas; and that prior to road construction, all drainfield sites should be staked off to eliminate traffic or disturbance. SEPTIC SYSTEM INFORMATION STREET ADDRESS iI LOT BLOCK C'_ SUBDIVISION (fot-w?job MONTH AND YEAR TESTING DONE_ LtJ y9p-/ ITEMS ALREADY COMPLETED _ �, if e -c 72F573 _� Rn�eiivG S ✓�n�_s / l�,�/tiG Arrra.3L NEED TO COMPLETE BEFORE ISSUING BUILDING PERMIT: ••� 7; v Iiii P-1 'ter' 0 SYSTEM DESIGN 0 SITE PLAN__ O OTHER oowv*&,'A ",^ N ate �, t - L SUADIVISION FILE NO. - DATE THIS SHEET FILED "��"�'�c' iiY •7 �� June 11, Box' jb9 Wayz:*, Mr. Richard Conry 21350 Exclesior Boulevard Excelsior, Minnesota 55331 Dear Mr. Conry: 1981 MN 55391 lie have completed a site evaluation for on-site sewage treatment facilities on 6 lots located west of Willow Road in Orono, Minnesota. A location map has been enclosed showing the location of the percolation tests, percolation data, location of soil borings and relative elevations of the surface at the location of the percolation tests. (For detailed contours please see topography prepared by Gary Gabriel). A loo of the soil borings is also enclosed. The soil borings reflect a uniformly high water table throughout the area tested. This condition prohibits the installation of conventional soil absorption systems and shallow trench systems. The percolation rates encountered and the gentle slopes on this site would indicate that mound systems should be satisfactory on each of these lots. We recommend that the future homes be provided with mound systems of soil absorption. Please call if you have any questions. Thank you. OF ORONO Yours very truly,, l Carl li. Borg, P.E. 1 4 VNe jL 440 'd I/ Je. 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