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Home My WebLink About1983-08-01 Septic System Design Report5 ! ! TOM SMITH ASSOCIATES Inc Consulting Engineers August 1, 1983 IncAnderson Builders 3911 Lcslee Curve Excelsior, I'iK 55331 ATTN: Keith Anderson AU6-2Be3 OF ORONQ SUBJECT: Evaluation and report for onsite setiage treatment system, I-Iaass Residence, flaxwell Day, Orono, lH! Job // 1979 Per your request we have condicted a site evaluation for the above subject site# This report presents our findings, recommendations, and desigi specifications for the sewage treatment for this site# CODCLUSIONS AND PJSCO.DSTDATIONS; The depth to seasonally high ground water table, as indicated by mottling of the soil samples recovered, is betvreen 3 to u feet belov; existinr. grade. The percolation rate of the soils above this are on the order of 20 minutes per inch. Even considering minimum depth of rock under normal distribution lines in a standard drainfield, the site would have to receive some fill in order to maintain at least 3 feet between the bottom of the drainfield rock and the seasonally hi£^i ground water table. At any configuration, the topography of the site would not allow total gravity flow of the system , and some pumping would have to be incorporated# Given these conditions and the size of the drainfield required, "we recommend the onsite sev/age treatment system at this site incorporate a mound type system in accordance with the attached specifications# The mound system, and in fact even a standard drain tile system co\ild be accomodated in the area we discussed on the site, however either would have to extend to the south sufficiently far to be vrell within the drip line of the mature maple trees immediately east of the proposed new house. In order to avoid any possible damage to these trees from construction of the system, and to mo\.’-s the treatment area out of the swale in that particular location, wo recommend moving the treatment to the north of the site v:e discussed, just beyond the small grove of evergreen trees where open conditions exist. This area is shovm on the attached sketch, and was tested id-th boring B-2 and percolation tests P-!^, P-5> and P-6# EVALUATION; The site in question is relatively level with bordering groves of very mature trees. The lot width is 282 feet in the east-west dimension which fronts on the lake, and is a total of approximately 8 acres# The areas tested were grassy and fairly open. The attached sketch shows the areas tested and nearby features of interest, along with contour lines# A total of four soil test borings ircre put down on July 28th, and six percolation tests were set up to soak on July 28th and then run off of July 29th# The soils vrere predominately silty and lean claj^s, llottling, an indication of 5109 Kimberly Road, Minnetonka, Minnesota 55343 16121 934-8031 August 1, 1983 Anderson Guilders Inc Job {} 1979 Pago 2 of 2 r r! ' r ■ ; Iiv- f-; -5. r r r-- seasonal high ground water table, was indicated in the soil sanples recovered to be at a depth of betwenn abbut 3 to I feet below grade. The percolation rates above the mottling condition were determined to be just lees than 20 minutes per inch. Two of the percolation tests showed rates of 9 and liO minutes per inch, but should be discarded as not representative In light of the other four rates. In addition, the design recommended would not be affected if either of these rates were used in lieu of the rate of 20 minutes per inch# The percolation tests were cond\ictdd in accordance with the standards established by the 1-Iinnesota Pollution Control Agency and the City of Orono. Details concerning the tests and the borings are given on the attached copies of the field test data sheets and logs of soil borings# Very truly Yours, TOM SMITH ASSOCIATES, IT.!: TIIOMAS K SiaTH, PE cc City of Orono ATTH: Mke Gaffron I her«by certify that this plan, specification, or report was prepared by me or under my direct supervision and that 1 am a duly Registered Professionol Engineer imder Iho Laws of fho Slot* of Minnesota THO>;\AS K. SMITH Data Reg. Noi^04£ I. TOM SMITH ASSOCIATES Inc Logs of Soil Borings Job #y? 7;? Location or Project S~.5~ r,*" Borings nade by y~?^^ >3V»» ^ ^^Date _; USDA-SCS _; Unified ; otherClassification System: AASHO _ Auger used (check two): Hand or Power_ _; Flight or Bucket _ _: other Depth, in feet 0 Boring number ^ Surface elevation 1 — 2 — 3 — 4 — 5 — 6 — 7 — 8 — A/^ «■*/ Ty C^^yr ^jeo r A0ra>/'r7’ OiA y^r jv”^ r CAAr f JT^OLaAA/^ U^/r/y /^••TrttAya’ /s^6f Af 7^ y.ft" \A/fr/r Ausr A^orrt^/ \AArjty :s‘A^AA^y /^t- End of boring at 7* ^ feet. Standing water table: Present at _ _ _ _ feet of depth, _ _ _ _ _ _ hours after boring. Not present in boring hole Mottled soil: Observed at 3 feet of depth. Not present in boring hole _ _ _ _ Observations and comnents: rZ^^/UAAyAfyT-ycT^ Depth, in feet 0 Boring number __________ Surface elevation 9^$^^ 1 — 2 ““ 3 — 4 — 5 — 6 — 7 — 8 <r^y7yy^i' Xyfy»/s>y^ TA^p-y j UX aP^AA ^ yA^yfC^ €>^ AtG^A ^PZ PtA O TPa. AAiAfi' ^yA ^ yAA\AAAAyy'ff‘ /f y- VAX/«- P~ y97^ ^AA y^AApAy' lAAyETPj yiy->^r^^-2> End of boring at ^ feet. Standing water table: Present at_ _ _ _ feet of depth, _ _ _ _ _ _ hours after boring. Not present in boring hole Mottled soil: Observed at feet of depth. Not present in boring hole _ _ _ _. Observations and comments: TOM SMITH ASSOCIATES Inc Lok8 of Soil Borlnss Job # y9 ■?s^ *Location or Project Borings made by ^ O ✓ y~✓V'Date -y - JZJr Classification System: AASHO ; USDA-SCS ji Unified ^ ; other Auger used (check two): Hand ^ . or Power_ _; Plight or Bucket _ _; other Depth* in feet 0 Boring number Surface elevation 1 — 2 — 3 — 4 — 5 — 6 — 7 — 8 — Oyr^/'< yS4^at,<y^j ^ ^y^yy C^^y^y* O-^ ^ y 771.•7^ End of boring at ^ ^ feet. Standing water table: Present at _ _ _ _ feet of depth* hours after boring. Not present in boring hole Mottled soil: Observed at feet of depth. Not present in boring hole _ _ _ _ Observations and comnents: Depth* in feet 0 Boring number ^ ~ Surface elevation 1 — 2 — 3 — 4 — 5 — 6 —. 7 — 8 — S'/fyO'PV' p.ytpyyp' Aer ^ ^ (Ziyf ^ y~:ypyfzfyr €>^ ^ JS^OLKyyiy ^ Z>^K PP^ ^pytyy Ay ^ A9r- /r-r^ End of boring at ^ ^ feet. Standing water table: Present at _ _ _ _ feet of depth* hours after boring. Not present in boring hole Mottled soil: Observed at feet of depth. Not present in boring hole Observations and comments: TOM SMITH ASSOCIATES inc c PERCOLATION TEST DATA SHEET Job r Test hole location Hole nxaibeT 7^- / ^ Date test hole was prepared 7 " 7 _ _ _, Depth of hole bottom. /^ inches. Diameter of hole, ^ inches. Soil data from test hole: Surrace Elevation ^ Depth, inches . Soil texture f) - ^5^7 //// V c/^i/ ' f y ^ ?. • /6 Method of scratching sidewall /7 ^V Depth of pea-sized gravel in bottom of hole. Date and hour of initial water filling J /J/ ^ ^ _ _ _ inches. 7 ? /r>:r^ ^ - :? ^ - •% Depth of initial water filling.inches above hole bottom. I Method usedi,%o maintain at least 12 inches of water depth in hole for at least 4 hoursc V .' O.-. .-> , Percolation test readings made by ~7' ^ starting at ^ ^ s' <2 ^ on (date) during test. '*p.m.. Maximum water depth above hole bottom inches. Time Time Interval, Minutes Measurement, inches Drop in water level, inches Percolation rate, minutes per inch Remarks A- y :s5 7 '=?o -7 Al /A -/3.3 / / \ t 1 6'^ /rjT^ 30 V 7/4 P/5 9:?o A 'v r^/ 9: A "7 3 o V -A-o /./ 5- 7^ <7 ■r •, Percolation rate ■2 ht minutes per inch. TOM SMITH ASSOCIATES inc m. r PERCOLATION TEST DATA SHEET Job ^ti Test hole locetlon5'.f Hole nu^er P ~. Date test hole was prepared / V' ^ Depth of hole botton. /^ Inches. Diameter of hole.Inches. Soil data from test hole: Depth, Inches O- Surface Elevation ^ Soil texture 1 V ^ Method of scratching sidewall /C A? f cr Depth of pea-sized gravel In bottom of hole. Date and hour of Initial water filling_ _ _^ Depth of Initial water filling, _ _ _ _ - . Inches.:l Inches above hole bottom. Method used to maintain at least 12 Inches of water depth In hole for at least 4 hours P T’-s '->,-» _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ /Percolation test readings made by 'y ^ 29 ~ starting at 7 ■ -^9 (date) / /r during test, 0 ^ Inches. T C> ^on (a^ . ■~p .m.Maximum water depth above hole bottom Time Time Interval, Minutes Measurement, Inches Drop In water level. Inches Percolation rate, minutes per Inch Remarks 7:^<?3 ^ t: / is - /g>.9 /^SO -7- 3^ V'v . / t ■ C '/r: lo ?/y 4 0 IQ. / /cV-v J ■"y.- 1 .• Percolation rate *minutes per Inch. TOM SMITH ASSOCIATES Inc PERCOLATION TEST DATA SHEET Job Hole ntimberTest hole location^^^^^rr Date test hole was prepared ^ - g-? . Depth of hole botton, Dianeter of hole, Inches. J <9 72^ Inches. Soil data from test hole: Depth, Inches / 7 Surface Elevation __ Soil texture i, ■ ! “7 /✓ I I Method of scratching sidewall / V^ Depth of pea-sized gravel in bottom of hole, ^ Date and hour of initial water filling ^ /"•5~7 Depth of Initial water filling. _ _ inches. ✓>inches above hole bottom. % • Method used to maintain at least 12 Inches of water depth in hole for at least ^ A hours ✓ Percolation test readings made by / / y ~ ^ ^ ^ "^3 starting at 7r (date) ^ 4 '' during test, o Inches. on ^a.m^ —p.m.Maximum water depth above hole bottom ‘ i I* Time Time Interval, Minutes Measurement, Inches Drop in water level, inches Percolation rate, minutes per inch Remarks t 'OX 3 c>Jl •7^- 6p ^ r ? A. 7/ 7^7 9:cp&>c O :p9 "? la c^.-7 T-.- -T" 3 ^A f Percolation rate *^.5 minutes per Inch. ’ TOM SMITH ASSOCIATES inc I ,! 11' .7 PERCOLATION TEST DATA SHEET ►Job i/. Hole nuniberT^t hole location ^_ _ _ _ _ _ _ _ _ Date test hole was prepared 7-2S> ~~ *^ 7_ _ _» Depth of hole bottom. /9 inches. Diameter of hole, /C inches. Soil data from test hole: Depth, inches ' CP ^ /9_ _ _ _ _ _ Surface Elevation Soil texture cy t«=» A 57 '//. A- c 'Z > t ;■ / Hethod of acratchina sidewall ■\ 4 •i inches.Depth of pea-sized gravel in bottom of'hole. Date and hour of initial water filling ^ P /Vf. "P ~ ^ ^ .J Depth of Initial water filling, _/5 inches above hole bottom. Hethod used to maintain at least 12 inches of water depth in hole for at least A hours /Jf/fa ry A <7'f_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /Percolation teat readings made by 7 ^ ^ 3 starting at “7 [ 3S (date) ^ during test, ^ ^ Inches. /TV ona -p.m . Maximum water depth above hole bottom Time Time Interval, Minutes Measurement, inches Drop in water level, inches Percolation rate, minutes per inch Remarks 5<'^7 ^ 7f u <i. •7'> q:o^ / -V*' 4 T.;) / ! 3F. • Percolation rate * // 7-^ minutes per inch. TOM SMITH ASSOCIATES Inc PERCOLATION TEST DATA SHEET Job fi Test hole locationSf Bole nunber f Date test hole was prepared ^ ^ —5? 5 Depth of hole bottom. inches. Diameter of hole, ^ Inches. Soil data from test hole: Surface Elevation _ _ _ Depth, inches Soil texture ^ / Method of scratching sidewall /:/ /* Depth of pea-sized gravel in bottom of hole, _ Date and hour of initial water filling 5 Depth of initial water filling, /^ P /t7 inches. 7S'3- inches above hole bottom. Method used to maintain at least 12 inches of water depth in hole for at least A hours jZ /y 7 ^ <r/ o/o _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Percolation test readings made by *TO^on 7- 79^ ^3 starting at 7^3^ ^3^ , Maximum water depth above hole bottom —Cdtio- - P*”*(date) during test.Inches. Time Time Interval, Minutes Measurement, inches Drop in water level. Inches Percolation rate, minutes per inch Remarks 9. L 71. 5 ?-/ ^ -Llf •> ^ % / r7 ^i\n ^C> v' 9: 9<- ^'<4 3^7/0. :> •/<lO 7/0. O o Percolation rate *40. o minutes per inch. TOM SMITH ASSOCIATES Inc PERCOLATION TEST DATA SHEET Test hole locetion A Job ■e>Hole nuaber Date test hole was prepared 7 - Diipth of hole bottom. inches. Diameter of hole, inches. 9s~C. 3 7Soil data from test hole: Depth, Inches b Surface Elevation Soil texture C/co u, 5V ./■ // \ i ' I Itethod of scratchinR sidewall /CA j i«epth of pea-sized gravel in bottom of hole.Inches. *•Date and hour of initial water filling _ Depth of initial water filling, /3 7 - inches above hole bottom. Method Used to maintain at least 12 Inches of water depth in hole for at least 4 hours ^ Percolation test readings made by ^ ✓ p-py• ........e., ....... ij ^ on 7 ^ ^ ^J* Starting at 7 f 4"/ , Maximum water depth above hole bottom (date) ^ ^ P-®-(date) during test.inches. Time "F77 Time Interval, Minutes Measurement, Inches Drop in water level, inches Percolation rate, minutes per inch Remarks n %W3 U'/z. /5>r ir.y? 7^ / 9 //r, 5' ^ j ^ Percolation rate ■/ 9.9 minutes per inch. TOM SMITH ASSOCIATES Inc k - u i r «■ r f- i h. spsciFiCATio?:s FOR ONSITE SF-JACS the;.t:'3i:t SYSTK^: Kaass Residence, Kaxwell Ba^;. Orono, Kinnescta August 1, 1983 1979 (5:^:ERALt These specifications are based on the standards contained in the Minnesota Pollution Control ONSira SEITAGE TRSAnXTJT MAIOJAL as modified by local regulations contained in resolution Ko« 891i, City of Orono ONSITE SE17AGE TREAT:s::T BSSICTI KJLNUAL. adopted April 13, 1978. The installer of the ' system shall be certified by the I'Hnnesota Pollution Control Agency, and shall be knowledgable of these standards. All materials, equipment, and Installations shall be in accordance vjith these standards. Except vdiere specifically spelled out in this specification, the installer has the latitude of choice of materials, techniques, equipment and final construction configuration as long as they conform to-the above standards. SYSTS!! COIPOl^ZsTSt ^e sewage treatment system shall consist of the following; - Two septic tanks in series. In lieu of two tanks, a single tank vith two separate compartments may be used, - One pumping station. - One mound tj^pe treatment area. - Building sevrer and appropriate connecting plumbing to make the entire system function. DESIGN PARA^-STBR3; The follo:;ing parameters have been used in designing th^ sewage treatment system; - U.’.’ELLING, Type I single family home with 6 bed rooms. The studio in the house and the nearby log cabin have each been considered as one bedroom in arriving at the total of 6 for des5gn purposes, •• PEP.COLATIOM PJiTE. 20 Minutes per inch in the upper 3* of natural soil, - LrnTITTG SOIL PROFIIE. I'ottled soil indicating seasonal higl; ground water level at 3» beloi^ grade. - ESTE-IATED SnJAGS FLOl-J, 900 gallons per day SEPTIC TA^rO: Tv7o septic tanks will be installed in the approximate location shov.Ti on the attached location plan. Each tank ^^ill have a capacity of not less than 1000 gallons. In lieu of tv70 septic tanks, one tpjik id.th two separate compartments, irith capacities of not less than 1000 gallons each* nay be used. The elevation of the tanks shall be such as to allow gravity flw: through the building sewer from both the log cabin and main house. Given a lovrer floor elevation of 9li2* - 7i" for the main house, it is estimated that the inlet invert at the tanks wil be approximately’’ elevation 939 (approximately 8» belov: grade). PI“*TI1:G Discharge from the second septic tank shall be to a rvr.ping chamber installed in the general location shoi-.T. on the attached location plan, Tv7o each one- half HP high head pumps shall be installed, controlled to pump on alternate cycles. The pump dosage rate per cycle sliall be 1^0 gallons. The pumping chamber shall have a to+’il capacity of 7^0 gallons. Controls will be provided TOM SMITH ASSOCIATES Inc • f- 1 I August 1, 1983 Speclfleatlonsj Maass Residence Job # 1979 Page 2 of h activate a warning mechanism in the event that either pump fails* The discharge line leading to the treatment area shall be 2" diameter. TRSATriE!'!? AREA: A mound system treatment area will be constructed in the general location shoi-.Ti on the attached location plan. The natural slope in this area is approximately 2^%% The mound configuration is indicated on the attached General Mound Configuration sketch. Pertinent details are as follows| - ROCK BED. The rock bed shaJLl be 10 feet wide by 78 feet long, placed on top of the sand fill. 9 inches of rock shall be placed under the perforated laterals and 2 inches of rock shall be placed on top of the perforated laterals. The rock bed material shall be a clean rock, ^ crushed igneous rock, or similar insoluable, durable and decay resistant material, free from dust, san^ silt, or clay. The size shall range from 3Ai inch diameter to 2 l/2 inch diameter. The rock bed shall be level* • PERFORATED LATERAL. The perforated laterals shall be 1 VI inch pipe with inch holes spaced 36 inches on center at the inrort. Three laterals will installed, lO inches on center, the outer two being 20 inches from the edge of the rock bed. The perforated laterals shall be connected by a 2 inch manifold pipe and shall be capped at the ends* The manifold shall connect the perforated laterals at the center* The purpose of the manifold pipe is*to distribute effluent from the pumping chamber equally to the perforated laterals. Details showing the manifold connection and cap is shcnm on the attached sketch, ”Tee to Te^i; Lateral - Manifold Construction". - SALT) FILL. After preparation of the natural ground, a sand fill will be placed as the base of the mound. The sand fill will extend at least 12 inches thick under the rock bed at its uphill location, and shall be level >rith the top of the rock bed, extending 18 inches beyond the rock bed, then dovm on a 3si slope. The sand shall be co’posed by weight of at least 2^f of very coarse, coarse, and medium sand varjdng in size from 2.0 to 0.2^ mm, less than 505^ of fine or very fine sand ranging in size between 0.25 and 0.05 Jnm* snd no more than lOJ^ of particles smaller than 0.05 inm. - Rinio?? Dr^^P-SIor. The mo'jnd shall be protected from surface runoff by constructing a diversion drainage uphill of the moimd system. The diversion shall consist of cohesive fill extending 8 feet beyond the uphill side of the mound at the center, uniformly extending, at the base, to the comers of the mound as indicated on the attached General Mound Config uration sketch. This diversion fill shall be compacted to of the standard proctor density according to ASTM: D-698, and shall form a smooth surface to the top of the mound. - SAIZ:Y LO;:: com:?.. The sand fill and rock bed shall be covered with a movjid of loosly placed sandy loam fill, 12 inches deep at the center of the rock bed and 6 inches deep at the edge of the rock bed, tapering outward at a 35l slope. - TOPSOIL COv’ER. The entire mound and runoff diversion shall be covered of topsoil suitable for growing grass, 7 ‘u TOM SMITH ASSOCIATES Inc ■; I 11 I f f ‘ i r k t-' ' r- ■ tI August 1, 1983 Specifications, Maass Residence Job # 1979 Page 3 of I II. MOUm SYSTE-I COFSTHUCTIOK: . C0K3TRUCTI0K EiU:PI'I^JT. A rubber-tired tractor nay be used for plowing or disking to prepare the soil surface but in no case shall a rubber- tired tractor be used after the surface preparation is conpleted. A crawler or track-tvpe tractor shall be used for nound construction# - SOIL SITHFACE PPEPA?ATIO!I, The discharge pipe fron the punp to the nound area shall be installed prior to soil surface perparation. The trench excavated to install the discharge pipe shall be carefully backfilled and compacted to prevent seepa'-e of effluent, Corpaction shall be to not less than 9S% of the standard proctor density according to ASTI!: D-698. The total area selected for the nound, including that under the dikes, shall be roughened in order to thoroughls*- break up any existing sod layers and to provide a suitable transition zone between the original soil and the sand layer of the mound. The area shall be roughened only when the moisture content of the soil 8 inches below the surface is drier than the plastic limit. Plastic limit is the soil moisture content below which the soil nay be manipulated for purposes of installing a soil treatment system, aiid above vihich manipulation will cause conpaction and puddling. If a fragment of soil can easily be rolled into a wire I/8 inch in dianeter, the moisture content is above the plastic limit. If the soil is dry enough to be friable and falls apart vrhen rolling it into a wire, the moisture content is below the limit, and soil nay be manipulated. The standard method of determining the plastic limit is specified in American Association of State Highvra^ and Transportation Officials (AASKTO) Designation: T 90^1» Surface preparation or roughening nay be performed with a mold board plow, a disk plow, or a bacichoe using only the teeth, Mold board plow furroughs shall be at least 8 inches deep, shall be thrown upslope and shall run perpendicular to the slope, ibere shall be no dead furrow under the mound. Bacldioe teeth may be used to roughen the soil surface and break up the sod laj'er, Ca'^e must be taken so as not to compact or puddle deeper soil la^^ers. In no case shall any surface soil be excavated and removed from the area* Mound construction shall proceed Immediately after surface preparation is completed, Eveim’’ effort should be taken to prevent rain from falling on the prepared soil surfaces. PLACIIIG SA!r» LiY^H, A crawler +ractor with a blade cr bucket shall be used to Tiove the snnd into place, A+ least 6 inches of sand shall be kept under the tracks to mdnlmize compaction of the plowed layer. The sand layer i:pon w’ ich the filter m.nterial is rinsed shall be level. TOM SMITH ASSOCIATES Inc 4 1 ’1 August 1, i:?83 Specifications, Kaass Residence Job § 1979 Page li of OraSR CONSIDSRATIONSx §he builder should rope or fence off the treatment area and not allow storage of construction materials or construction traffic on this area# Such activities will destroy natural properties of the soils and invalidate some of the design parameters* ATTACKOTS: The following items are attached to and made a part of this specification. - Site Evaluation Location Plan A Qeneral Mound Configuration sketch - Tee to Tee Lateral - Kahifold construction sketch I hereby certify that this plon« specificolkn^ or reportwospropcredbyrr.e cr under my dirad supervision ond lho» ! cni a day Rtglitmrad . 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