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Home My WebLink About1982-08-23 Septic System Design Specifications> \. 4 TOM SMITH ASSOCIATES ine Consulting Enginsors August 23, 1982 Doug Sjoberg 775 South Brown Road Orono, MN SubjectI Percolation test results and onsite sewage disposal desipi reconunendations, n9io In response to your authorization we have condwcted percolation tests on your proj^erty at 775 South Brown Road, This report preser.ts our results and recommendations for construction of a new system on tlie prenises, T!iu need for these teats and consideration of a nc\/ s; sto,n has been prompted by the inadequate functioning of the existing system in the wooded area, on the north slope to the north of the l.ouse. The area tested is to the vast of the existing system, situated on a north facing slope on open ground. The slope is aprroximately 12^ and is covered mostly by grass. Specific location of the soil boring and percolation tests are shown on the attached sketch. One soil boring to a total depth of seven feet, and two percolation tests were run. Surface alev.tions between the two percolation test locations was approximately’ h l/2 feet. RKULTS ffie soil encountered was primarily a sandy clay with a surface ccvcring of clayey silt topsoil. No mottling or evldaucc of ^X'^'indwater was encotntnred to a total depth of seven feet. The percolation rates determined were 20 and 27 minutes per inch in the two test holes. The soil boring log and percolation test data sheets are attached. RECOMMENDATIONS It is our rccormendatlon that a percolation rate of *7 minutes per inch bo used in designing the onsite sewage system at t! i-.. property. According to Information furnished by you, the existln:' house is essentially a tiace bed room home* We recommend considering a system desi-Tied for a Type I residence, as it is likely that more than two major water using appliances are, or will be installed during the probable useful life of this system* 5109 Kimberly Roed, Minnetonlte, Minnesota 55343 16121 934*80^'- 4" ’ • HV)lO AuGust 20, 1982 Doug ojootrg Pane 2 Critical sizes of the various elements of the system are indicated below. MINIMUM SEPTIC TA' K CAPACITY DRAIN FIELD PIPE DIAMETER SOIL TREATMENT AREA: 6“ of rock under drain pipe 12" of rock under drain pipe 18" of rock under drain pipe DEPTH OF TRENCH BELOIV EXISTING GP-\DE: 6" of rock under drain pipe 12" of rock under drain pipe of rock under drain pipe 1000 Gallons 1; inches 750 SF 6(.<0 SF h95 S? 22 inches 28 inches 32 inches The above date Is based on minimum cover over the drain field. It is recommended that the minimum cover be used in order to allow for maximum benefit through evapo*transplratlon. Given the nature and dimensions of the site, we recommend the drain field be constructed with four each 50 foot drain lines, connected by drop boxes arranged down the slope where the tests were run. The trench width should be 3o Inches and there shoi>ld be 12 Inches of rock under the drain field. Other arrangements meeting the above design criteria of critical sizes can be used. REMARKS The tests and recommendations presented herein were in accordance with proceedures outlined in the Onsite Sewage Treatment Manual, published by the University of Minnesoia Agricultural Extension Service and the Minnesota Pollution Control Agency, 1982 edition. Construction of tlie system should be in accordance with this manual. Veiy Truly Yours TOM SMITH ASSOCIATES INC I hereby cen«ty ihot f!iis plun« speciHcacion, or report was prepared by me or under my direct supervision and Ihof I am o duly ReQllIorod Prolessionol Engineer under the Laws of fte Slate of Minnesota TiiCKiAS K 5^aTH, PE TKS/oas incl THOmVAS Ki SMITH Datt Raq- ^ 9044 / i TOM SMITH ASSOCIATES Ir / / 1: J^Mo^^Sol^Jorlngs Location or Project 77$ S, Brovm Road, Orono, Minnesota_ _ _ _ _ _ _ _ _ Borings nade by Tnm Smith _ _ _ _ _ Date 8»l?-82 Classification System: AASHO _ _ _ W0#i9l0 USDA-SCS Unified other Auger used (check two‘> : Hand X . or Power_ _; Flight • X . or Bucket _ _: other Depth,Boring number Depthg Boring number In feet Surface elevation In feet Surface elevation CLAYISY SILT, Dk Drown to Brown, with roots, Med, Dry (ML;0,7$ 1 —SANDY C:AY, Drown, with gravel below 2*, Medium to stiff. Dry 1 — 2 —above about U* (till) (CL)2 — 3 — •• 3 — 4 —4 — 5 —5 — 6 —6 — 7 —7 — eImi) "fiORfNO = 8 —8 — End of boring at 7 fact.End of borine et feet. Standing water table:Standing water table: Present at fact of depth.Present at feet of depth. hours after boring.hours after boring. Not present In boring hole Y Not present In borlne hole Mottled soil:Mottled soil: Observed at feet of depth.Observed at feet of depth. Not present In boring hole I Not present In boring hole Observations and coanenta: Soil quite dry above U', becoming moist at and below about $<. No water on recheck at 2i00 PM 0-X3-82 Observations and coMents: / » * PERCOLATION TEST DATA SHEET WO # 19lO Hole number r»lTest hole location 77^ S. Brotm fid.. Qror.o. f-!T? Date test hole was prepared B.12»e2_ _ _ _ _ _ _« Depth of hole bottom. 30 inches. Dlaneter of hole, 6 Inches. Soil data from test hole: Depth, Inches 0,^" _ _ _ _ _ _ _ 8'*-30" Surface Elevationi Soil texture m.ivpv Silip Lk nwn to L'.vit*. Lrr. u/i'oota Sar.dy Clay, iirovm, w/f^ruvcl (till) Method of scratching sidewall Pointed hoe Depth of pea-sized gravel in bottom of hole.inches. Date and hour of Initial water filling fl-12-82 Depth of initial water filling, 23_ _ _ _ 12:00 Moon Inches above hole bottom. Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Ohaa'rv.^lt^ on Percolation test readings made by Toir. Smitt R-1 _ _ _ _ _Starting at Ptiy_ _ _ _ 6 Inches. (date) during test. m: p.m.Maximum water depth above hole bottoal Time Time Interval, Minutes Measurement, Inches Drop in water level. Inches Percolation rate, minutes per inch Remarks 2il2 2?Start ---- 22 </R </R ____2ll_______Chflck------ 2tl2 30 evil1 1/h 2h "ME 22 Refill tilt in 99 l/fi 1 1/R ____22----------- 3:17 22 Refill ^«)i7 10 99 l/fl 1 1/fi ____22----------- 22D m JVJ Li20 10 22 l78 ll/a 27________ .. ...-------- Percolation rate “linutes per inch. * » i PERCOLATION TEST DATA SHEET Hole nunber WO^ 19ljO P-2Test hole locetlon 77<^ S. Rt»auti Omnn^ ftTI Date teat hole was prepared 6-12-82 ____________, Depth of hole bottom, 2li Inches. Diameter of hole, 6 Inches. Soil data from test hole: Depth, inches 0-9_ _ _ _ _ _ __ 9-2lj Surface Elevation: 99*2' Soil texture Clayey Silt, Dk F.row:i to Lrrwn. Ltv. w/roots Sandy Clay. Drown v^f-Tfivol (till) Method of scratching sidewall Pointed Hoe Depth of pea->sised gravel in bottom of hole. Date and hour of initial water filling B-12-82 Depth of initial water filling, iL_ _ _ inches. 12:02 PM inches above hole bottom. Method used to maintain at least 12 inches of water depth in hole for at least A hours Observation _ _ _ _ _ _ _ _ _ Percolation test readings made by _ 6-l^-62_ _ _ _ starting at 8 Inches. Tom Smith Maxitmim water depth above hole boccoQ (date) during test. Time Time Interval, Minutes Measurement, Inches Crop in water level, inches Percolation rate, minutea per inch Remarks 2:10 16 Tnif.inl fi 15 36 3 A 3/li 20 Check 2:1:8 ^30 17 VZ 1 1/2 20 16 nAf-tii 3:12 30 17 1/2 1 1/2 20 17 3/8 oc' V 22 3:ti8 16 Refill L:l§30 17 1/2 1 1/2 20 1 Percolation rate minutes per inch. do To 5. BAOwN AD 5 i --E 7 -BM Eccv A GAA AG,C I SME TC H wo at /590 SG A 4E : NO,,VL i do To 5. BAOwN AD 5 i --E 7 -BM Eccv A GAA AG,C I SME TC H wo at /590 SG A 4E : NO,,VL