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HomeMy WebLinkAbout1981-05-11 Septic System Design ReportORONO COPY SIT'; -,Vls,UAT10.; IOT 7, BLOCK 1 `TH 3 111JR i Hy 5-11-81 /0(7 (eW S` ` c / On 1-:ay 6-7, 1981 tine above lot was tested for the suitabil- ity of supporting an on -site sewage drainfield system. Four per- colation holes were tested and two soil borings taken in the pri- mary site while two percolation holes and one soil boring were ta- ken in the alter•nat© site area. In addition, one :;oil borin was taken in the area of tho proposed house. The percolation holes were dug 6-inches In diameter and 2 ft. deop while the soil borings wer,; dug 6 inches in diameter to the 11. ft. depth and 3 inches in diameter to the remaining depth. All holes were dug with bucket typo hand augers, Because of the hiC1i water table in this aroa the percolation holed wero tested at the shallower depth for a mound or shallow trench system. Since the area contai-od an abundance of black loam, the av :rs3e Percolation rate a rather fast 115.5 minutes ,Aii.ch would allow the she trench system to be con- structed. However, because of the high grater table in the area,it will be necessary to construct an interceptor drain around the drain - field area to divert runoff water. This could be part of the drain tile system used t•ri.th the house. This drain should be 4 to 5 feet do-,p �:tth rock bein; placed over the tile with some black dirt i)laced on trio top to establi.sii a grass cover, Additional oyster desi�-,n lnformat` on follows. If any other information is no !deri, ploZro contact !.-p. Sincerely, .00 Bari; Lot 7, Block 1 ��•. �;"%�% The NUR:; CRY Percolation Results Role No. Material Percolation Ruts P-1 Black Loam 17.1 Eindinch P-2 Black J ,oam 12.6 P-3 Black Loam 30.0 P-4 Black T.,oam 1r.0 P-5 Black Loam 16.0 P-6 Black Loam 20.0 The average percolation rate 13 lt1.5 ninutos n,ir inch. moil Borings- B. r 1 Do-)th(ft.) I:atorial 0.0-2.6 Black ?_oan 2.8-5.5 Bro n Clay Ioam Ylottled coil at LF fe:ot and water table at L, feet after PJ� hours. s.B. .r _2 Depth fit_) Elaterial 0. �)-2.0 Black I can 2.0-�.0 Brown Cla * Loam 1:ot .led soil at _).o fe �t and wator taltle ,,t 3 foot after 24 hrs. S.B. I Depth(ft.) ?:at,rial 0.0-4.0 Black Foam )�.0-6.) Brom %lay ] oam Vottled soil at b. fe t and ivter table at i:_.2 feet after Z4 hre. D th(ft , 1".Ztc=�'inl ,).0-0.5 BlacL I,oa_-i 0.5-1.7 J�'rn. '.ands; 71a; I. mn 1..7-3.7 Coal-_>e and 3.7-7 ne .;.-,tad ;oar::o ;cc' ^nd .ater table at ').7 foot ifter J1. hours. . �YS T: 2D, SIGN 1. Percolation Rate. Tune of System. 18.5 minutes per ir.. ., jhallow Trench system. 2. Proposed Flow 'late 4 bedroomsC:lrO G.P.D. = 600 G.P.D. 3. Soil Treatment Area Required For 16-30 percolation rate use 1.6t x 600 r=1000 Sq. F 4• 4 trenches 2.1, feet wide acid 100 e-of feet longue 1000 Sq. Ft. _ 1 trenches should have 3 feet of.aeperation from the water tal,l.e so they would vary from ground level to 1 foot deep unless the interceptor drain lowers the water table. 5. Drainfield Rock Required 37 cubic yards are required for 1000 sq. ft. of drainfield with 6 inches below the 1� inch distribution pipe and 2 inches over the top of the pipe. 6. Septic Tanks Two tanks are required with each having a capacity of at leant 1000 gallons. In addition, depending on the house elevation, It might be necessary to have a separate pumping compartment and pwnp to reach the drainfield area. L o i 7, BG o C,C 'TNE /t/aAJ-CA Y /°= PfACa4ArloA/ Ala S.B. = -ro/G BeRi/✓G I G I N E '� toe F. r f/re. '7E : / to z /00 " Ln 0 m m No M< -nrn moo z m � m s-a vow' (s 11' .(� f�� S P e � •- - s .k ovi RjO ►�NCr /� V 2 isBovoc !A) , .+- �G✓ t L1 SA LAP /iu 7'0 Q- O, f Ta ePca I L T2, f Rer;/ .wN S�Dy cNY oYL a t-A' LoA--e . /V o "TTt_ / /A/ Gr Vj/,g v,,4,-