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Home My WebLink AboutSeptic System Approval CITY OF ORONO ('/w/\- SEPTIC SYSTEM APPROVAL c,. CITY of ORONO II:- � Municipal Offices t• ��l ti Post Office Box 66 1i� 1`�� ) Crystal Bay,Mi nesota 55323-0066 kESTA - LOCATION: 1255 Woodhill 741/'0. OWNER: GENERAL CONTRACTOR: Bruce Bren SEPTIC CONTRACTOR: SITE EVALUATOR:S-P Testing REPORT DATE: June 9, 1994 The City of Orono has Approved your on-site system design as of August 5, 1994 (approved-disapproved) (date) with the following comments: THIS IS NOT A PERMIT. This is a design approval form which must accompany the site plan. A permit must be issued to a licensed septic contractor prior to installation. A list of currently licensed septic contractors is enclosed. NOTICE TO INSTALLERS: Any changes to the approved plans and specs must have prior approval of the Inspector (473-7357). Call for inspections 24 hours in advance. ALL DRAINFIELD AREAS MUST BE FENCED OFF prior to building site excavation and fencing must remain in place until final site grading. Approval to pour footings will not be granted until the Inspections Department has verified that primary and alternate sites are adequately protected. NO VEHICULAR TRAFFIC OF ANY KIND (cars, trucks, earth moving equipment, etc.) is allowed within 20' of tested drainfield sites either before or after system construction. Compaction of these areas could render them unusable prohibiting the timely completion and or limiting the long term use of the property. A site copy will be available at the City Offices for the septic contractor. CITY OV O ON , By _ .. /I ./.4 2 7-r..4/)'L StepheltS • khan, On-site Systems Manager TELEPI IONE-473-7357 • FAX-473-0510 S-P TESTING, INC. Steven B. Schirmers — MPCA Cert. No. 627 951 Katydid Lane NE • St. Michael, MN 55376 • (612) 497-3566 JUL' 2 0 1994 June 9 , 1994 Bruce Bren Homes Lot 4 , Block 1 Woodhill Ridge Orono, Henn. Co . , MN This On-Site Sewage Treatment System is Designed for a Type 1, four bedroom home Designed in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances . The soils on this site are SCS soils mapped - HbC - Hayden loam. A seasonally high water table was located at 44" to 48" , (mottled soil ) . A Shallow Trench System may be installed using gravelless trench. The soils at a depth of 12" have a percolation rate averaging 3 . 6 min/inch. The setback for the wetland is 75 ' . A pumping chamber will need to be installed to lift the effluent to the treatment area . The power supply and switches must be located outside the manhole and pumping chamber in a weather proof enclosure . A warning device must be installed with a light and sound device, this is in case of a pump failure. (mercury floats are a good method) . All neighboring wells are located greater than100 ' away from the proposed treatment area. Keep all heavy equipment off of the proposed treatment area before and after construction. The treatment area should be marked off before construction. This Design is not valid & the system will need to be relocated if failure to protect the areas proposed for On-Site Sewage Treatment occurs . CONT ' D r � Bruce Bren Homes Lot 4 , Block 1 , Woodhill Ridge Orono, Henn. Co. , MN (2 ) With proper installation and maintenance, this system should have no problem in treating septic effluent effectively. Nothing other than gray water, (laundry, showers , etc . ) human waste & toilet tissue should be disposed of into the septic tanks . Garbage disposals are not recommended. Smaller amounts of laundry soaps , dish soaps , cleaning agents , etc . are better for the system. Antibacterial soaps & chlorine agents may kill the bacteria needed to treat septic effluent properly. Additives are not recommended, they may cause harmful damage to your system. Recommend to pump & clean your tanks by a certified pumper every year if you have 1 tank & every 2 years if you have 2 tanks to insure proper maintenance. - S7� Steven B. Schirmers SBS/ds -- — — — __ —� '14- .? A\--‘_.• N AV`-( ' -G6--\\ --1t,;-c o � oY~ AHC- 1 60)-k`.�F-•-\X10 191.9, . t� 1 I. / t '44 s/z.,,i• `,. v C.. /' \ ueos4 o 1 , fL_\-<a�f- -c�c�+ty�s t u>_i\ 7W ice% • Lik.---VA.. 1 14-c-,--.-t-444,\:/1,0"3:c.,1_111:4\4-.;O:r;r;c..T.,,, \ \ 1 \ I ,4}ocJ�J. `^ ,e, ** , 9e 0.1 . .4 I , .O 91 / / / / i ;2\ �g��960 �jO\\J(y \ {� �, r _ 6i 0 -r sEreucc gi �i z " o ti u.i $�e. 4 x/n //I' N`RLP u. .,, G. !~ .= .4 �'�`41 'C,+" �'Y CA" -)-�. --'CZ- , 4." E' .1:11 •/ !r ) 0 `i s� Tn.-) i + / // ' ./ . yo -i xm-cc- i 'S c� 1 . ..,\...-E-:V. — `lamtt,c� / tt 961. i�/✓ 9� r ns \ I 9///'// //// 4., 3O ,l 11 �>/ /�// � , + "oto \ i/ // //.g 4� '$7,7 Y�.oVoS�T� 9av a 3-1 ll(1)111!"./+ , r Ili !,�; ",d- -- a 14 lo"e,a. I�Yair�.Fs� G: Perco�otion Tests Scale: 1��=HO4 / 'II-It r + -tuctil 33y'1 3t,o wN.� \ XSoil Borings i o�3 9K�6 ( s° S�tow�� +1 + t ,/ ^1 . 3a, Bench Mork R'r 14>>a� /7� I m4 I+ . ',/''''',1144---- *--',,,,''4'4 � Note: This system is to be constructed to meet L Wm3C� -4\__ ',"•-0).n. • - - I! ' _o SSP. tt>rl .1 fi " ' Tggs.y __A �' the Minnesota Pollution Con!roi Agency t9�5 • r' -tso'- ��1 Chapter 7080 & Local Ordinance _ \"(BWI vTGL11�l1kb N _ �� 3 .+, EYK�m ?LT ,o-s.3 4'9.s I, ss� ;4�; •,� �s' ��,s' ,I, 33' l� Check all underground utilities! I' f 1 'I .71 • g,% PROrpERTY OF:S�Pr-C'� 1-IoMES s -\c _)o7- tn - 0 1''1 • ,C'�1• • •�I.Iv' S-//P TESTING/IJt/C. Designed By: 7t- A • L7 LTt-< -- -- Dole: (o/3Qi Y, PH.6:2-497-3566 1 I _ r existing grode bock filly min. ii 4)"t.-1.c ,k.,. i'mP`3-T4- xl 4, 'o-1=,. 1 ID-,-1,:.. rake sidewalls 8 bottom to i • SET- BACKS remove smearing =r- ' HOUSE System must be: Tank 222 from property lines TRENCH X- SECTION La-.1)\). ,..-:•;..-":::-,c•-, '1'^V .e--\-\ . =1-1)-2� .13,5v 1•n ,01--- 2sfrom wells t>AL-1--01-%-r 1 211 from bldgs. (min, of two trenches) = • 1°ou Treatment area 'from lakes, 2,... st rnsv� (max. length 100') Treatment area �2: from property lines • MN►-A14o E$ v+'tn.' " ,from wells M,r 1� , coJ u , R� �'�� X12,from bldgs. • /� from trees ote:Power supply and switches must be in a weather <T,•- SOIL BORING ELEVATIONS 1 i proof endosure outside_pumpio�hamker - .__>/ , min. Sr- —=--- _ ' T H tt I EL.-9,60 -�1� - -- .0 / Tank "pipe - , -i ' `_-' I ! TH."2 EL.-quo S Tank ,:<6,7‹. `i� 'QI ,D� .,- CZ: rode L°I°slope TH 73 EL.-9'6,0 Drop to Tank sicµ fi� � F� "� ..s ,. J At least 3'� of undisturbed - TH• 4 EL-`��"z- Min. I"to 8' t� vEcp J J „ � Pumping earth between trenches TH.`5 EL.-6N4.0 Max.l to4 Chamber op ELEVATION at PROPOSED PUMPING 4"to 6"dia. pipe DROP BOXES CHAMBER-9�?�.J (ground elev.) p'.I, PP ��n.v • roPos a '1'01- o' "%v*-9et(a,y ' 1 Lou SYSTEM DESIGN )''F��'c Ft oo1 --914.4 TYPE--.1,Li BEDROOM.- Percolation rate 3.1, min./inch (design //,,-30 min./inch)\_o1am Sol =w"o,a. ��4 J �� ` *t1S6 3 too t-\N',>rr LS � Treatment area required w/ (. of rock filter material —* O% /Doo sq.ft. of trench bottom area needed = 3� trench width = 33 L lin.ft.of trench needed , number of drop boxes -14w1 • (to be determined by the installer) ' Number of tanks required a , Ist tank/eev gal-, 2nd tankloevgal. minimums • Cleon rock — cu.yds. ( 3/4" to 2 '/2"dia.,includes 211abovepipe )31,0 Lt ,c 10'6,3t,1�4AL CESS 1/54 )-14)'"‘• cRO ERTY OF r-`'�� ' ‘,40)...-\5:<.., Pumping chamber capacity= 25% of daily sewage flow.of (,w gal.=(soca'+Reserve.storages gal.t Pipe back drainage.gal.=Z222.go!. cop. L.01 LA1 . ,,I...\(-- �U,0c��-1 N L._ =1 c',--,ac t4�.i t- -R' L 4aw,4 Li.7. --VII,n 1000 �o,l.oap , ( Reserve storagegal./ bedroom=_ o3yal. t pipe back drainage-i:� gal./!OOGn.ft.3 pipe- length of pipe needed app1�0 ft. =.gal.) g\a1a''G � OV--01- 0 M1 to . N =t-\L.\.C'D I Pump size_irk_hp w/mercury float pump controls .-‘5, -,;:, I as 0'E40 ' 5S. 1'D.ISL-1,1M-V4 4S cam,} )y,.,,n M A.X, S-P TEST/NG /N , Note: When constructing bed , this area should be shaped Note: Distance ce from treatment area to neighboring wells— Designed By: • e)T to divert run-off from entering treatment area. L � 3" - -c- - -1-141,4-‘4 Jo0 Date ...(2/an/ILI , PH. 612-497-3566 INDIVIDUAL SEWAGE TREATMENT SYSTEM WORKSHEET FLOW Estimated Sewage Flows in Gallons per day A. Estimated (-70gpd (gpd) measured x 1.5 = -- gpd Number SEPTIC TANK VOLUME of Type I Type II Type III Type B. D -1000 gallons Bedrooms IV 2 300 225 180 SOILS (Site evaluation data) 3 450 300 218 60% 114 600 375 256 ofiuu C. Depth to restricting layer= y4 'S0 t-.1461'fret iC 5 750 450 294 in D. Maximum depth of system C-3 ft = 54.,l IC I .'1 feet 6 900 525 332 Type I. E. Percolation rate 3 . (/ MPI 7 1050 600 370 II or F. Soil Sizing Factor ),L sq ft/gpd (See table 3) 1.--.0)-)s,1.1. , _I \ 8 1200 675 408 co i h s TRENCH BOTTOM AREAL ;`,'''. ':-'-• �+\^r.• : ,`, Septic Tank Capacities,in gallons H. For trenches with 6 inches of rock below the pipe: A x F= c-ora x ).c,') =;707.) sqft of bottom area Number of Ntinimum Liquid Liquid capacity with Bedrooms Capacity garbage disposal I. For trenches with 12 inches of rock below the pipe: • A x F x 0.8 = x x 0.8 = sqft of bottom arca 2 or less 750 1125 3 or 4 1(XX) 15(x) J. For trenches with 18 inches of rock below the pipe: 4 or 6 15(X) 2250 A x F x 0.66= x x 0.66 = sq ft of bottom area 7.8 or 9 2(Xx) 30kx) over 9 K. For trenches with 24 inches of rock below the pipe: A x F x 0.6= x x 0.6 = sq ft of bottom area BED BOTTOM AREA L. For seepage beds with 6 or 12 inches of rock below the pipe; 1.5 x A x F= 1.5 x x = sq ft of bottom area Soil Characteristics and Required Areas for Scwa2e Treatment ROCK VOLUME IN CU FT Percolation Rate in Square Gallons Ni. Rock depth below distribution pipe plus 0.5 foot times bottom area: 5tinut,.per Inch Soil Texture feet per per day per M =Rock depth(ft) + 6 inches x Area (H,1,J, L or K) (MPI) gallday on per square foot ( ____ft+0.5 ft)x cu ft Faster than 0.1 • Coarse Sand ROCK VOLUME IN CU YDS 0.1 toy Sand 0.83 1.20 0.1 to 5 Fine sand•• 1.67 0.60 N. Volume in cu ft divided by 27 6 to 15 Sandy Loam0.79 M+27=cu yds=-+-27= cu yds 16 to 30 Loam 67 0.60 31 to 45 Silt Loam 2. 0.50 ROCK WEIGHT 46to60 Clay Loam 2.20 0.45 Slower than 60••• Clay ---- O. Cubic yards times 1.4 =tons N x 1.4= tons .--x-1.4= tons DISTRIBUTION (Check one based on slope) ~"'~'~"''~""~'~ ''~'~'� r•r•r•r•:•r•r•r•r•r•:•r;r•r• Bed(less than 6%slope) ti•::::** ti',1•.; ti••••••.• ti•ti ✓:;:��rti.ti�tir.rti�::;..;: :•r� 2inchCovcr r•r•r•r•r•r•r•r•r; „▪;f;r- Trenches '�▪ ''•''Z��'• ' L.Drop boxes(any slope) .:.7.1:V....:. :;,r::• r•r•r•r• '\ 'r;r•r�r' inch Pipe Distribution box(level to slightly sloping) %*..fti fti. •�r TRENCH LENGTH :•'r• e:e;e• '••••fs''••:: P. Select trench width= 3 b ft po''tn - .'' :<< - c-'- ►sc\A ;�• •�:::•:::•*•1•'•''••'•• :▪:'S r•r•r•r•r•r•r•r•r•r•r; ti•ti••.•ti•ti••.•'.•ti•••'•' Q. Divide bottom area by trench width: (H,I,J,or K) +P= ,:::::::•:::::•:;::•.•;i:•:.....:::::•::•,:.••r•f.r.r-r.r•r•r•r•r :.f•r ; •. ti•ti••,•ti•. ti•.•. ••. ti••. nch • r•:•:•:•r•r•r•r•;:r•:•r•r• lineal feet 'ti•ti•ti•ti•ti•:•:::; �•'••ti•▪'- Rock Below the Pipe /ooz 3 =33'� • . • + lineal feet .....,.•••,..%•••••••••••••••••••••:•:.•▪•••••••,r•r•r•:•r•r•:•:•r•:.:•r•: LAWN AREAti•ti•.•ti•ti•ti•ti•ti••• ••ti••••, i•r•r•r•r•r•r:r•r•:••:.;r;r;r; R. Select trench spacing,center to center= feet ' ' '•' S. Multiply trench spacing by lineal feet R x Q= sq ft of lawn area ____________ _ _1 �___-____ 33y x S� _ /1,insgftti.-1,,n �a' L.o0 LAYOUT(Use other side) ,-------T � ��_ 1.Select an appropriate scale;one square= feet. 2.Show pertinent property boundaries, right-of-way,easements. 7 3.Show location of house,garage,driveway,and all other ! �0 "%)14. `� b741,Lx- . s5 t° improvements, existing or proposed 4.Show location and layout of sewage treatment system. KwN.)-sic- ` 5.Show location of water suPp .lv well. ,'i _ 6. Dimension <,i' t backs •.i'-. i:>>, 1 , F-17 PUMP SELECTION PROCEDURE ENC) PERFORATION CF A PERFORATED LATERAL A. Determine pump capacity: �-wd•Cf,•r Gravity Distribution 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of -:: .oa.a - Luau!Sand La,., .cn by.'of nay o a,.ow co.w.e j-:-Lartr of Grioterts.',citric(or tax- water use rate. / . _..a rosin>op..) ? Maximum suggested for delivery to a drop box of a home system is 2,700 4g,�-,;r` ';z .o�,- ^, gallons per hour(45 gpm)to prevent build-up of pressure in drop box. � Pius \� . le to Dir.orn F.,e rd or \ .��o,r� or Roca Luys -Parfora,brr Luuf.o of Pressure Distibution c,..,,sib Loy., B L'"'°' • 3.a. Select number of perforated laterals ' -_, _ _ ,. b. Select perforation spacing= feet a andl.Pw saLorin'Scaified c. Subtract 2 ft_from the rock layer length. �yQ '2ft------- feet. Rock Lezegth d. Determine the number of spaces between perforations. Length perf.spacing= ft+ ft.= spaces Required Perforation Discharge e. spaces+ 1 = perforations/lateral in talions per minute(gpm) f. Multiply perforations per lateral by number of laterals to Discharge get total number ofperforations. 11 - - x ��u�,= perforations. Head ;_ �" ; ma (feet) g. -qtr x �r= gpm. 1 1.0a 0.56 0.74 SELEC:i t:U PUMP CAPACITY L-4, -...<-_ gpm I,'i,- ,...' 7.Ob 0.80 1.04 B.Determine head requirements: a. Use for single family homes I. Elevation difference between pump and point of discharge. b.Use for all other applications J? feet 2. If pumping to a pressure distribution system,five feet for pressure required at manifold if gravity system,zero. . feet 3. Friction loss a. Enter friction loss table with gpm and pipe diameter. Pipe Length Read friction Oiss in feetper 100 feet fromtable. Point of Discharge F.L.= 3.� ce, ft./100 ft of pipe T b. Determine total pipe length from pump to discharge Elevation Difference point. Add 25 percent to pipe length for fitting Pump _ e7L7,0 loss,or use a fitting loss chart. Equivalent pipe length-1.25 times pipe length= F-18b )Sb x 1.25= ) c feet c. Calculate total friction loss bymultiplying1.5 inch 2.0 inch 3.0 inch gpm friaim loss per 100 ft of pipepe friction loss in ft/100 ft by equivalent pipe length. Total friction loss= ?,d ce• x 1 (<c<" =100= (- feet 10 0.96 0.28 '12 0.96 0.28 4. Total head required is the sum of elevation difference, 14 1.28 0.38 special head requirements,and total friction loss. 16 1.63 0.48 18 2.03 0.60 20 2.47 0.73 0.11 / 'f + + C0 25 3.73 1.11 0.16 (1) (2) (3c) 30 5.23 1.55 0.23 35 7.90 2.06 0.30 S 40 11.0743 2.64 0.39 TOTAL HEAD feet 45 14.733.28 0.48 50- - - - 3.99 0.58 55 4.76 0.70 C. Pump selection 60 5.60 0.82 1. A pump must be selected to deliver at least L. gpm (Step A)with at least ;. feet of total head (Step B). L-13 CE•RTIFtCATIO[J 4 O0627 Logs of Soil Borings Location or Project Bruce Bren Homes, Lot4 ,B1k. 1 ,Woodhill Ridge,Orono Borings made by S-P Testing, Inc . Steve Schirmers Date 6-6-94 Classifiction System: AASHO ; USDA-SCS X ; Unified ; Other Auger used (check two) : Hand X , or Power , Flight , or Bucket X Depth , Boring number 1A Depth, Boring number 2A in in feet Surface elevation 9P1 . 7 feet Surface elevation 980 . 5 0 Topsoil dark brown loam 0 Tcosoil dark brown loam 0 - 8" 0 - 8" 1 - Gray 8" - 1 ' 2" brown loam 1 - Gray brown loam _ 8" - 2 ' 2 _ Brown clay loam 2 Brown clay loam 3 - 3 - 2 ' - 3 ' 4" Brown loam 1 ' 2" - 4 ' -MOTTLED 4 ' 3 ' 4" - 4 ' -MOTTLED 4 ' 4 - 4 4 ' - 4 ' 4" olive broown 4 - Rusty olive brown silty clay 4 ' 4" - 4 ' 10" loam Rusty olive brown loam 5 - 5 - Rusty olive brown loam 4 ' l0" - 6 ' 4 ' - 6 ' 6 - 6 - 7 - 7 - 1 8 8 - End of boring at 6 ' feet. End of boring at 6 ' feet. Standing water table: Standing water table : present at feet of depth, present at feet of depth, hours after boring . hours after boring . N^t present in hole X Not present in hole X Mottled soil : Mottled soil : Observed at 4 ' feet of depth . Observed at 4 ' feet of depth. Not present in hole Not present in hole Comments : Comments : L-13 CERTIFICATION 4 00627 Logs of Soil Borings Location or Project Bruce Bren Homes,Lot4 ,B1k. 1 ,Woodhill Ridge,Orono Borings made by S-P Testing, Inc . Steve Schirmers Date 6-6-94 Classifiction System: AASHO ; USDA-SCS X ; Unified ; Other Auger used (check two) : Iland_ X , or Power , Flight , or Bucket X Depth , Boring number 3A Depth , Boring number 4A in in feet Surface elevation 982 . 0 feet Surface elevation 984 . 2 0 - - ---- 0 - -- - Topsoil dark brown loam Topsoil dark brown loam 0 - 8" Gray brown loam _ 0 - 10" 1 - 1 - Gray 10" _ 1 , 2„ brown loam 8" - 1 ' 4" 2 - Brown clay loam 2 - Brown clay loam 3 - 3 - 1 ' 4" - 3 ' 8"-MOTTLED 3 ' ; " 1 ' 2" - 3 ' 10"-MOTTLED 3 ' t0' Rusty olive brown Rusty olive brown clay loam 4 - clay loam 4 - 3 ' 10" - 4 ' 2" 3 ' 8" - 4-1/ 2 ' Rusty olive brown 5 - Rusty olive brown 5 - loam loam 4-1/2 ' - 6 ' 4 ' 2" - 6 ' 6 - 6 - 7 - 7 - 8 8 End of boring at 6 ' feet. End of boring at 6 ' feet. Standing water table : Standing water table : present at feet of depth, present at feet of depth, hours after boring . hours after boring. Not present in hole X Not present in hole X Mottled soil : Mottled soil : Observed at 3 ' 8" feet of depth . Observed at 3 ' 10" feet of depth . Not present in hole Not present in hole Comments : Comments : L-13 CERTIFICATION # 00627 Logs of Soil Borincns Location or Project Bruce Bren Homes , Lot4 ,Blk . 1 ,Woodhill Ridge,Orono Borings made by S-P Testing, Inc . Steve Schirmers Date 6-6-94 Classifiction System: AASHO ; USDA-SCS X ; Unified ; Other Auger used (check two) : Hand X , or Power , Flight , or Bucket X Depth , Boring number 5A Depth , Boring number 6A in in feet Surface elevation 9B4 . 7" feet Surface elevation 983 . 5 0 - _ Topsoil dark brown loam— 0 - 0 - 8" Gray brown loam 1 - 8" - 1 ' 2" 1 - 2 - Brown clay loam 2 - 3 - 3 - SAME AS BORING # 3 112" - 3-1/2 ' loam 3-1/2 ' - 3 ' 10"-MOTTLES 3 10" 4 - 4 - Rusty olive brown loam 5 - 5 - 3 ' 10" - 6 ' 6 - 6 - 7 - 7 - 8 - 8 - � f End of boring at 6 ' feet. End of boring at 6 ' feet. Standing water table : Standing water table : present at feet of depth, present at feet of depth, hours after boring . hours after boring. Not present in hole X Not present in hole X Mottled soil : Mottled soil : 3 ' 10" 3 ' 8" Observed at feet of depth. Observed atfeet of depth. Not present in hole Not present in hole Comments : Comments : CERT . 400627 PERCOLATION TEST DATA SHEET ,, S—P Testing, Inc. 6-7-94 10 : 45 (`''r" Percolati� :; .„(c.- ,,mdc h on startin at h.i Lot4 ,B1k. 1 ,Woodlhill Ridge lA 6-6-94 Test hole location . Hole number . Date hole was prepared Depth of hole bottom 12 inches. Diameter of hole 6 inches Soil data from test hole: Depth. inches Soil texture 0 — 8” Topsoil dark brown loam 8" — 12" Gray brown loam Knife Method of scratching_sidewall Depth of gravel in bottom of hole 2 inches 6-6-94 11 : 30am 12 Date and hour of initial water filling Depth of initial water filling inches above hole bottom Automatic siphon Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Maximum water depth above hole bottom during test 6 inches Time Percolation ime interval. Measurement. Drop in water rate. Remarks minutes inches level. inches minutes per inch 10 : 30 prefill 6 10 : 45 11 : 00 2-3/4 5 . 5 15 min 11 : 08 11 : 23 ' " 1, " 11 : 34 11: 49 " " " 11: 50 ! • 12 : 05 " " " " Percolation rate = 5• 5 minutes per inch. • CERT. #00627 PERCOLATION TEST DATA SHEET S—P Testing, Inc . 6-7-94 10 : 46 C.a.m. Percolation test readings made by on starting at p.m. Lot4 ,B1k . 1 ,Woodhill Ridge 2A 6-6-94 Test hole location , Hole number , Date hole was prepared Depth of hole bottom 12 _inches. Diameter of hole 6 inches Soil data from test hole: Depth, inches Soil texture 0 — 8" Topsoil dark brown loam 8" — 12" Gray brown loam Method of scratching sidewall Knife Depth of gravel in bottom of hole 2 inches 6-6-94 11 : 30am 12 Date and hour of initial V,ater filling , Depth of initial water filling inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon ,Maximum water depth above hole bottom during test 6 inches Time Percolation ime interval, Measurement, Drop in water rate, Remarks minutes inches level, inches minutes per inch • • 10 : 30 prefill 6 10 :46 11 : 01 II 5-1/2 2. 7 15 min 11 : 09 11 : 24 la 5-1/4 2.9 " 11 : 33 11: 48 5-1/8 2. 9 II " 11 : 51 12 :06 n 5 3 .0 II " Percolation rate = 2 • 9 minutes per inch. CERT. #00627 PERCOLATION TEST DATA SHEET Testing, Inc . Percolation test readings made by S-P Tesg on 6-7-94 starting at 10 : 47 :i1 Lot4 ,B1k. 1 ,Woodhill Ridge 3A 6-6-94 Test hole location . Hole number . Date hole was prepared Depth of hole bottom 12 inches. Diameter of hole 6 inches Soil data from test hole: Depth. inches Soil texture 0 - 8" Topsoil dark brown loam 8" - 12" Gray brown loam Method of scratching sidewall Knife Depth of gravel in bottom of hole 2 inches 6-6-94 11 : 30am 12 Date and hour of initial water filling , Depth of initial water filling inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon , Maximum water depth above hole bottom during test 6 inches Time Percolation ime interval, Measurement, Drop in water rate, Remarks minutes inches level. inches minutes per inch 10 :30 prefill 6 10 : 47 i 11 : 02 5-1/4 2. 9 15 min 11 : 10 11 : 25 5 3.0 11:32 11: 47 I 4-7/8 3 . 1 11: 52 12 : 07 4-7/8 3 . 1 II " l Percolation rate = 3• 1 minutes per inch. CERT. #00627 . PERCOLATION TEST DATA SHEET S-P Testing, Inc . 6-7-94 10 : 48 a.m. Percolation test readings made by on starting at p.m. Lot4 ,B1k . 1 ,Woodhill Ridge 4A 6-6-94 Test hole location , Hole number , Date hole was prepared Depth of hole bottom 12 inches. Diameter of hole 6 inches Soil data from test hole: Depth. inches Soil texture 0 - 10" Topsoil dark brown loam 10" - 12" Gray brown loam Method of scratching sidewall Knife Depth of gravel in bottom of hole 2 inches 6-6-94 11 : 30am 12 Date and hour of initial water filling . Depth of initial water filling inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon , Maximum water depth above hole bottom during test 6 inches Time I Percolation ime interval. Measurement, Drop in water rate. Remarks minutes inches level, inches minutes per inch ' 10 :30 prefill 6 10 : 48 11: 03 n4-7/8 3.1 15 min 11 : 11 11: 26 " 4-5/8 3. 2 " " 11 : 31 11 : 46 " 4-1/2 3. 3 " " 11 : 53 12 : 08 " 4-3/8 3. 4 " " • Percolation rate = 3• 3 minutes per inch. • CERT. #006 7 PERCOLATION TEST DATA SHEET S-P Testing, Inc . 6-7-94 10 : 49 ( a.m.) . Percolation test ^ ;:de v on starting at p.m• Lot4 ,B1k. 1 ,Woodhill Ridge 5A" ' 6-6-94 Test hole location . Hole number . Date hole was prepared 12 6 Depth of hole botton inches. Diameter of hole inches Soil data from test hole: Depth. inches Soil texture 0 - 8" Topsoil dark brown loam 8" - 12" Gray brown loam Method of scratching_ sidewall Knife Depth of gravel in bottom of hole 2 inches 6-6-94 11 : 30am 12 Date and hour of initial water filling . Depth of initial water filling inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon Maximum water depth above hole bottom during test 6 inches Time Percolation ime interval. Measurement. Drop in water rate, Remarks minutes inches level, inches minutes per inch • 10 : 30 prefill 6 10 : 49 11 : 04 4-1/8 3. 6 15 min 11 :12 11: 27 ! 4 3. 8 " 11: 30 11 : 45 " " 11 : 54 i 12 : 09 " • 3 Percolation rate = ' 8 minutes per inch. CERT. #00627 . PERCOLATION TEST DATA SHEET Ia'-11:1)-- Percolation .rr1/Percolation test readings made h� S—P Testing, Inc . 6-7-94 10 : 50 on starting at p.m. Lot4 ,B1k. 1 ,Woodhill Ridgqe 6A 6-6-94 Test hole location ,Hole number Date hole was prepared Depth of hole bottom 12 _inches, Diameter of hole 6 inches Soil data from test hole: Depth, inches Soil texture 0 - 8" Topsoil dark brown loam 8" - 12" Gray brown loam Method of scratching sidewall Knife 2 Depth of gravel in bottom of hole inches 6-6-94 11 : 30am 12 Date and hour of initial water filling , Depth of initial water filling inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon , Maximum water depth above hole bottom during test 6 inches Time Percolation ime interval. Measurement. Drop in water rate, Remarks minutes inches level, inches minutes per inch . 10 : 30 prefill 6 10 : 50 11: 05 II 5-1/2 2. 7 15 min 11 : 13 11 : 28 II II II II " 11 : 29 11 : 44 " 11 : 55 12 : 10 " Percolation rate = 2.7 minutes per inch. r D-35 Part 3: Gravelless Options for Trench Systems The Gravelless Trench has been used in Texas since 1971. It is an extremely viable option for onsite sewage treatment in Minnesota, and testing and data show that it is as reliable as a trench filled with gravel. As a result, it has been adopted as a standard system for use in Minnesota. (See Figure D-33.) The idea of using something other than rock to hold the trenches apart is not new. Chapter 7080 currently recognizes two acceptable options. The first is gravelless pipe, which is corrugated pipe surrounded by a synthetic fabric. The second is a chamber made out of a nondegradable material, typically plastic, used to hold the soil apart. GRAVELLESS TRENCH CONSTRUCTION DETAILS 1 1/2" Inspection Inlet Pipe to Next Well Drop Box 1 1/2 Male 0 Adapter a`I• — 12" Soil Backlill ) : \\� _1 • • • e • • •0 • Corrugated Tubing Covered • nnnnnrvnnnr with Geotextile FabriChnnnnrnnnr, Drop Box 1.1 Trench Length = up to 100 Feet Overfill to Allow NOTES: 1. Bottom of trench must be level. Top for Settling of tubing must be level. V Soil Te i`\\\G 12" of Soil 2. Scarily trench bottom and sidewalls Backfill Backfill at least 12 inches above trench bottom 24" to expose natural soil. I A. 11" UI 2_L 3. For proprietary products consult manufacturers performance criteria. 1.1 Holes Located 24" ' at 4 and 8 O'Clock Figure D-33 i .. r E VERTICAL SIDEWALL SEPTIC TANK -FINISHED GRADE AT LEAST 6"TO 12" SOIL AT LEAST I" 4" DIA. —I COVER 4" DIA. 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