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HomeMy WebLinkAbout1987-09-21 Septic System Design ReportSYSTEM DESIGN FOR GARY CARLSON IN TRACT 8, R.l S. # 1098 ORONO. MINNESOTA 9-21-87 1.Percolation Rate, Type of System_. 22.3 minutes per inch. Standard System. 2. Proposed Flow Rate. 4 bedrooms @ 150 G.P.D. = 450 G.P.Q. 3. Soil Treatment Area Required. Use 2.0 factor x 450 G.P.D. = 900 Sq. Ft. minimum. 4. Size and Number of Trenches. 300 lineal feet of trenches 3 feet wide - yuO Sq. Ft. These trenches would be spaceu a minimum ,f 7.5 feet center to center and be about 2 fee,. Jeep in the natural soil. 5. Drainfield Rock Needed. 50.0 cubic yards of rock is needed to have 12 inches under and 2 inches over a 4 inch distribution pipe. 6. Septic Tanks. 2 septic tanks of at least 1000 and 750 gallons are needed. It appears that a third pumping tank will not be needed depending on the final house el,va- tion. 7. Additional Information. All construction and materials must adhere to the provisions of the City of Orono. All grading and construction traffic must be kept off the primary drainfield area as well as the new alternate site. Drainage must: be diverted from the drainfield area by grading of swales or berms or the ise of do interceptor draintile. If there are any other questions, please contact me. Sincerely, P E��y `^ Mark S. Gronberg, PCA certified TERCOUTION TEST DATA SHEET f- 3S Test hole location ! -,.1 L(:_ Bole number Date test hole was prepared_ -2- - , Depth of hole bottom, 38 inches. Diameter of hole, _C_ inches. Soil data.from test bole: Depth, inches Sc _l texture 3O Method of scratchine sidewall _ f�OLc 71-.4-Ar,-1rFA Depth of pea -sized gravel in bottom o: hole, 2 inches. Date and hour of initial water filling :GG//h 9-zy_j; Depth of ini-ial water filling, 3 6 inches above hole bottom. Method used to maintain at least 12 inches of water depth in hole for at least 4 hours /,CFi•c •,v! Percolation test readings made by / i.� �;,t►o��NF,a on � a.m. starting at / : /y . Maximum water depth above hole bottom (dace) during test, inches. Time Time Interval, Minutes II Measurement, inches Drop in water level, inches Percolation rate, minutes per inch Remarks s" / / .c 19 23 7 Perco.'stion tat@ a 2 a• 7 sinotes per inch. PERCOLATION TEST DATA SHEET Test hole location _UU6dFC Bole number Date test hole was prepared 9 Ik of hole bottom,_ inches. Diameter of hole, _i�_ inches. Soil data from test hole: Depth, inches Soil texture 0 -/�_ Bc i:', Y_'IA Ph /L - 2 Y LDii/✓• Method of scratching sidewall ROLE S'C',eA7-,'NCR. Depth of pea -sized gravel in bottom of hole, 2 inches. Date and hour of initial water filling 6; /io p^ 7-2y.-p-? Depth of initial water filling, t 6 it lies above hole bottom. Method used to maintain at least 12 inches of water depth in hole for at least 4 hours P F F/4 Li��� Percolation test readings made by Qol-1 ( LI-le c r on 9-2starting at (:/d A.M. . Maximus water depth above hole botto: (date) during test, inches. Time Time Interval, Minutes Measurement, inches Drop in water level, inches Percolativn rate, minutes per inch Remarks / 7Vre AP I 0) / / It Percolation Tate L '� minutes per inch. PERCOLATION TEST DATA SHEET Test hole location &1,2FI.L Sole number 3 _ Date teat hole was prepared Q Z y- f? Depth of hale bottom.­?g inches. Liamrter o: hole, _K*_ inches. Soil data.from test hole: Depth, inches Soil texture -- -- .C.on Y AA t4 Method of scratching sidewall Depth of pea -sized gravel in bottom of hole, i 2 nches. Date and hour of initial water filling C:o G Dept-h of initial Ovate- filling, j S inrh,*s above hole bottom. ' Method used to maintain at least 12 inches f wa_ depta in hole for at least 4 hours /t EF/C C 4i;/F Percolation test r, .adingc made by _r'�i✓ C'�;r�iF�Pt= on L47-k"? starting a.m. 2l b at �; �L aximum water �cprh above hole bottos (datat e) during :est, inches. Time ':ime Interval, Minutes Measurement, Drop in water inches level, inches PLtr_Olation rate, minutes per inch Remarks / D ,;.2 �2— - — i Y / � Percolation rat% l 7 minutes par inch. 8- 3S PERCOLATION TZST DATA SHEET Test hole location:LC _ Bole number .S r Date test hole vas prepared ,1 E r 2 Y /',' Depth of hole bottom. 'Y o inches. Diameter of hole, ._ inches. Soil data from test hole: Depth, inches Soil texture %.' Veit e G 0A/'t Method of scratching sidewall 4-', L _ t';'f x /. 'e Depth of pea -sized gravel in bottom of hole, Z inches. Date and hour of initial water filling 00 Y-2Y-P3 Depth of initial water filling, 3 6 inches above hole bottom. Method used to maintain at least 12 inches of water depth is hole for at least 4 hours �Q-- r" _/x. ' Percolation test readings made by 'DIP" c7lealIC<;e on A.M. starting at _/ 1/0 Maxi— water depth above hole bottc (date) - - during test, inches. Time Time Interval, Minutes Measurement, inches Drop in water level, inches Percolation rate, Remarks minutes per inch [i21W�. Percolation rate - 20.0 minutes per inch. PERCOLATION TEST DATA SALT 8- 3s Test hole location AUet'-jC44 Hole number �O - 4g Date test .sole was prepared 9-2 y -e _3 , Depth of hole bottom,_ inches. Diameter of hole, 9 inches. Soil data .from test hole: Depth, inches Soil texture O - 2 ' - P o - ?,!r tieoc.�N .t i ewnl Method of scratching sldewal:._ Depth of pea -sized gravel in bottom of hole, 2 inches. Date and dour of initial eater filling _6 a �/►t 9_ y-�j 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_ XF.rrc c.'.r Percolation test readingr made by G'i�i �,r'�,�.�(c".=C.: on ? starting /: a.m. (date) _ 8 at 20 . Maxirum water dept.', above hole bott during test, inches. Time 'i'e Interval, Minutes ?Measurement, inches Drop in water L:vel, inches Percolation rate, minutes per inch Remarks O J 9 ' 2 y o Percolation rats - _ 'Z V. 0 ainutas per inch. Lop.a of Soil Borin`s 11-18 Loratlon or Project Borinps made by 102Z4 Ate_ 4r,.,RQAeA2f e 6 Date �Q t Classification System: AASHO USDA-SrS Unified other _ Auger used (checV.. two): Hand X. or Power __; Flight _, or Bucket: other Depth. Borinp. nurrher _— —L Depth, Rorinp num`.-r 2 in in feet Surface elevation feet Surface elevation 1 -- 2 — 4 — 5— OK. OOPc4w C ..A r -inn t A: 9 1A,4&,N L0AM �k!! ��r1 S•1 NG � LO/1 /k F — eRCa,," S'AN-VY C' 4A'( Vn R — Eno of boring at 7• S feet. Standings water table: Present at feet of depth, hou-,s after t A np. Not present in boring hoI.p )P< Mottled soil: Observed at feet of depth. Not present in boring hole �. Obs,rvations and comments: au CK 40AM OK. 4rjV ry 404^ I , _ . I I IK. dRo&,K, C4A r 44A M 3 _ OR 0 ZW- C. A'r 4f A A M eR.p „v r SA.vO t' C" ?+ 4 — vK. 000W v S-ANOr L •AN+ 5 — 6 — ( BRote.w S.1Mot' CeAr eorrr 7 — 8 — End of boring at 7. S feet. Standing niter table: Present at feet of depth, hours after horine. Not present in borino hole Mottled soil: Observed at feet of depth. Not present in boring: hole 2<_, Observation. and comments: Lo s of Soil Borings B-18 ►.oration or Project Borings made b AoU /Lftp,��FPG —_ Date Classification System: AASHO USDA-SCS ; Unified : other Auer used (check two): Hand 2L, or Power _ ; Flight _, or Bucket X: other r Depth. Boring. nucrher _ — ik-pth, Aoring number °in Surface elevation feet in Surface elevation BOAC A0, /K. Cam' A ZDA/K I BAG C4.,^' C z A r L 0A&I GXAt' 4FA-0W � C�LAr' LeAlm 4T, 46k9'Cv.✓ CLA- c:•A^ End of boring at �_ feet. Standing aster table: Present at feet of depth, hours after boring. 1 Not present in boring hole Mottled soil: Observed at y. o feet of depth. Not rresent in boring hole Ohscrvations and cortnents: End of boring at _ feet. Standing water table: Present at feet of depth, hours after boring. Not present in borin- hole Mottled soil: Observed at feet of depth. Not present in boring hole Observ„tions and comments: s- 3S PERCOLATION TEST DATA SHEET AL-7 6./R r CA4I J'rN Test hole location_I?Aer Bole number�P"�� Date test hole was prepared 9 - 9 47 Depth of hole bottom,_ inches. Diameter of hole, inches. Soil dais•from test bole: Depth, inches. Soil texture 0-9 8 - i8 Method of szratch.inq sidewall /✓itF &CACA CO.rM jt&.av✓ tI A r+^ Depth rr pea -sized gravel in bottom of hole, 2 inches. Date and hour of initial Later filling 9 -19-P1 Depth of initial Later filling, .15 inches above hole bottom. Method used *.o maintain at least 12 inches of Later depth is hole for at least 4 hours X OCA-it c..1A. 4� Percolation test readings made by A.WA 'Roc.fErr, on 9-19 47 r-a.m:arting at 3:// .m Maximum water depth above hole bottom (date) during test, inches. ;ime ` Time i Inte-ti•al, ! Measurement, ' Minutes inches Drop in water level, inches Percolation rate, Remarks minutes per inch � �• I N If I yt Percolation -rats 20,0 minutes per inch. �LT , s- 3s PERCOLATION TEST DATA SEAT J 7-Lr- oo Teat hole location ' C.4,t r 6(el fore Bole number 2- 10' S Date test hole was prepared Depth of hole bottom,— inches. Diameter of hole, 6 . inches. Soil data.from test bole: Depth, inches O- 6 Soil texture �tA�a.•- c c � r c a�.►� Method of scratching sidevall Nit.0 JC.e.4fr1let Depth of pea -sited gravel in botto3 of hole, 2_ inches. Date and hour cf initial water'filling 9-/9jf7 pla Aw+ Depth of initial vat-; filling, /S inches above hole bottom. Method used to maintain at least 12 inches of water depth in hole for at least 4 hours AFsi«MC Percolation test readings made by AfdA,K 6WA-., f,?e- on 9� /9 f� starting at 3: �t a.m. . Maxiw= water depth above hole bottom (date) .a. dur_ng :est, inches. time ( % me i Interval, ' Xeasurement, vinutes inches I Percolation Drop in water rate, level, inches minutes per inch Remarks L i w 1 ,6 If 9/4 mutes per inch.Tercol4tion- -rate • — �. Lo 1s of Soil Borings ' II-27 Location or Project _04r C,It11'Dw err Op(S Ne /09fi Borings made by Agook 6i0AI'MA6: Date Classification System: AASIIO ; USDA-SCS _; Unified ; other ,Auger used (check two): Hand >—C, or Power _; F1ighE `, or Bucket 2!�_; other Depth, Borin& number Depth, Boring number 2 SB-S feet Surface elevation feet in Surface elevation — 0 0 _ ,#IAPAe rAAW% I I &AtK CDA 1— /Rvrr.� 2— 3 — dtow�✓ C!„'r 44A)'% 4— 7 — 8- End of boring at i S feet. Standing water table: Present at feet of depth, hours after boring. Not present in boring hole >(_. Mottled soil: Observed at V. 0 _ feet of. depth. Not present in boring hole Observations and comments: `. 1 — `,PGc•-, CL J Y Ga,i 0-•. 2 — 3 -- 4 W1Ir'4&0- CLAY ?nd of boring at f. D feet. 3tandin); -ater table: ?rescn,. at feet of depth, hours after boring. :lot present in boring hole x -. ''.ottled coil: )bserved at y -s feet of depth. trot present in borinr. hole Observations and co:rments: TO: Jeanne A. Mabusth FROM: Michael P. Gaffron DATE: October 12, 1983 SUBJECT: Dick Howell - Variance - Septic System Review Tract B, R.L.S. 1098 The applicant wishes to build a new home on an existing lot of approximately 1.5 acres with no City sewer or water available. In addition, he is asking for a front setback variance to allow construction of the house near the west side of the lot presumably due 'o the extreme slopes and to keep from encroaching on the drainfield sites. Note that the application shows a different house proposal than the one shown on the site eva]-.ation report submittedi. The longer, narrow configuration would likely encroach :much less on the drainfield sites. The primary and alternate sites tested are located on a rei:cively flat area halfway down the steep slopes. Part of '_.his area has been used recently as an access for the neighbor on the south in order to bring materials in form septic syscem repair. However, from the perc test results, compaction in this location was not a problem. Adequate area appears to exist suitable for trenches on both primary and alternate sites. The site evaluator did note that runoff diversion will be necessary to protect the sites from excess surface water. Based on the information submitted, I recommend approval of the application. Approval of the front setback variance appears to be necessary so as not to encroach on the drainfield areas. The applicant should be informed that an actual system design and final site gradi_nq plans must be submitted prior to issuance of building permits.