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HomeMy WebLinkAbout10-18-2018 Septic DesignCity of Orono Septic Plan Review Reviewer: q� / All work shall be done in full compliance with all applicable septic and zoning code. Joseph Olson D.B.A. 5 Bedroom Rusty Olson's--Soil and Percolation Testing 1-2250 Septic 1- 1250 PUMP Joseph J. Olson--MPCA License #810 10 X 63 Rook Bed 11481 Riverview Rd. NE, Hanover, MN 55341 36 GPM Pump (763) 498-8779 Fax (763) 498-8290 #16 TDH Revised October 18, 2018 Norton Homes 4710 Augusta Street Orono, Hennepin County This on-site Sewage Treatment System is designed for a Type 1, five -bedroom home in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances. The periodically saturated soils were located at 18-28 inches (mottled soil). Due to the periodically saturated soils, a pressurized mound system with 6 inches of rock will need to be installed to treat the septic effluent. The bottom of the treatment area must be located at least 3' above the saturated soils. This system is designed with 6 inches of rock. The soils at a depth of 12" have a percolation rate averaging I I MPI. A 2250 -gallon septic tank is designed for this site. All tanks need to be insulated if there is less than two feet of cover over the top of the tanks. Clean outs must be installed on the end of the laterals for maintenance. Use 7/32 -inch perforations on the laterals. A Darwin 1300 -gallon 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 weatherproof enclosure. A warning device must be installed with light and sound devices; this is in case of a pump failure. A flow measurement device must be installed. Including but not limited to a water meter, event counter, running time clocks or electronically controlled dosing. Keep all heavy equipment off of the proposed treatment areas before, during and after construction. The area around both sites must be fenced off by the contractor before any construction begins. 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 water and toilet tissue should be disposed of into the septic tanks. Iron filters cannot go into the septic system. Garbage disposals are not recommended. Additives must not be used they may cause hamnful damage to your septic system. It is recommended that you pump the septic tanks every two years. Sincerely, Joseph J. Olson CA iA 2011 purple code Mound Design www.SeptiQlResource,com (vers 15.2) Property Owner: Site Address: Comments: Norton Homes 4710 Augusta Street Date: 10/1812018 PID: 0611723320011 instructions: = =enter data 0 = adjust if desired 0 = computer calculated - DO NOT CHANGE! 1) =bedroom Type �I Residential System i 75D GPD design flow ;} Yes Garbage disposal or pumped to septic 50% larger tank with multiple comp/tanks Gal Septic tank (code minimum) 2250 Gal Septic tank (design size /LUG req'd) 1) F2250 Tank options: none 5} 1.2 GPD/fe mound sand loading rate contour loading rate of12 req's a min 62.5 ft. long rockbed it 16.0 ft rockbed width 62.5 ft rockbed length i} 3.0 ft lateral spacing 3.0 ft perforation spacing (maximum of 3 for both) end feed manifold connection ;} =laterals 60.5 feet long 21.0 perfs / lateral 63 perfs total (1 /2 a perf means the first pert starts at the middle feed manifold) �} 7132 inch perfs at =feet residual head gives 0.56 gpm flow rate per perforation for this pert size 8 spacing, ft pipe size on line 12, max perfs/lateral = 30 line #8 must be less ?I<. In) 4.0 doses per day (4 minimum) 1 I) F 188 gallons per dose (treatment volume) 2.00 5x 12} 2.00 inch diameter laterals must be used to meet "4x pipe volume" requirement 2.00 3x 13) 25 feet of 2.0 inch supply line leads to �galions of drainback volume (Tip: "top feed" manifold to control the drainback) 14) 142 gallons TOTAL pump out volume (treatment + drainback) is} P36 feet vertical lift from pump to mound laterals, leads to a: G} GPM Ca 16 feet of head, Pump requirement (note: >50gpm may require an extra 3.6' of head) 17} F750 gal Dose tank (code minimum) 1250 gal Dose tank (design size / LUG req'd) at F 25.49 gpi leads to a 18} 7.5 inch swing on Demand float, or timed dosing of5.3 min ON (confirm pump rate with drawdown (this delivers Average flow, =70% of Peak design flow) 1 9 1hrs OFF test and adjust as necessary) ig) 12 inches from bottom of tank to "Pump OFF" float N) 20 inches from bottom of tank to "Pump ON" float, or FI 12 inches to "Timer ON" float if time dosed >-i) 23 inches from bottom of tank to "Hi Level" float, or F 33 1 inches to "Hi Level" float if time dosed 22} 664 gallons reserve capacity (after High Level Alarm is activated) 0.45 gpd/ft' Absorption area Soil Loading Rate, which gives a mound ratio of [124] (minimum) (this must match the soil boring log) desired mound ratio =percent site slope (0-20% range) =(% downslope site slope, if different than upstope) 18 inches, or 1.5 ft. to Redox or other limiting condition (need at least 12" to be a Type 1) Treatment zone contains Tinches of 0% soil credit, and =inches of 50% soil credit. Giving a: 18 inch, or 1.5 ft. Sand Lift Mound CRITICAL FOR FUTURE CERTIFICATIONS I I I 27.0 ft.Total ABSORPTION width (with sand beyond rockbed as follows:) 0.0 ft. upslope and sideslope 17.0 ft. Downslope Individual slope ratios give BERM widths (topsoil beyond rockbed) of: �1 4:1 upslope ratio 11 ft. upslope berm n1 4:1 sidestope 17 ft. sideslope berms i 4:1 downslope 1 25 Ift. downslope berm Overall Dimensions: 10.0 ft. wide by 62.5 ft. long Rock bed 46 I ft, wide by r 971 ft, long Mound footprint 4" inspection pipe r— 18" cover on top berm 1 11 ) . i 1 1 I . nnwnclnno harm 1 25 12" cover on sides (6" loamy cap &6" topsoil) 1.5 Clean sand lift D=Pth to Limiting Absoration Width 27.0 Mote: For 0 to 1% slopes, Absorption Width is measured from the BedeguaRy in both directions. For slopes >1%, Absorption Width is measured downhill from the upslope edge of the Bed. Rock Bed: 10.0 fit, by 62.5 ft. by ©inches under pipe, plus 20% gives =yd' or "1.4=FT9_1 ton Mound Sand: (note: volume is based on 3:1/4:1 slope from top of rockbed, Exchange sand for loamy cap if desired) 31.0 up + 104.9 downslope } 16.1 ends + 44.0 under rock = 235 yds or "1.4= 329 ton plus 20% Loamy Cap: =ft, by 93 ft. 6" deep, plus 20% gives Topsoil: 46 ft, by F 97 ft. 6" deep, plus 20%gives 87 yds or "1.4=122 ton yd' or "1.4= 139 ton 99 I hereby certify that I have completed this work in accordance with all applicable ordinances, rules and laws. Rusty Olson"s Soil Et Perc 810 10818/18 Resigner Signature Company License# Date Installer Summary 2250 galton Septic tank (minimum) Tank options: none ouxo targer CanK W1 Un mutupte eomprianKs 1250 Igalton Dose tank (minimum) at 25.49 gpi F36 GPM @ 16 ft. of head, Pump required 7.5 linch swing on Demand float which translates to roughly 4.8 inches of float tether length if time dosing is required -->5.3 minutes ON time Fchours OFF time 20 inches from bottom of tank to '"pump ON" float, or 12 inches to "timer ON" float 23 inches from bottom of tank to "Hi Level Alarm" or 33 inches to "Hi level alarm" if time dosed 25 ft. of 2.0 inch supply line with end fieed manifold connection (Tip: "top feed" manifold to control drainback) 18 inch, or 1.5 ft. Sand Lift Mound 10.0 ft. wide by 62.5 ft. long Rock bed 3 laterals 2.00 inch diameter 60,5 ft. long 3.0 ft. lateral spacing 7/32 inch perfs 3.0 ft. perforation spacing F­No7 Effluent filter a alarm =clean out Et valve box assemblies 27.0 ft.Total sand ABSORPTION width (minimum) 0.0 ft. upslope and sideslope (sand beyond rockbed, minimum) 17,0 ft. Downslope (sand beyond rockbed, minimum) Specific slope ratios give BERM widths (topsoil beyond rockbed) of: 4:1 upslope ratio11 ft, upslope berm 4:1 17 sideslope ft. sideslope berms downslope 25 ft. downslope berm 4:1 4" inspection pipe 18" cover on top berm = _ I 1� I . nnuan-Inna harm F 25 12" cover on sides (6" loamy* cap &6" topsoil) 1.5 11 Clean sand lift _ 1.5 Depth to Limiting Absorption Width F701 Note: For 0 to 1% slopes, Absorption Width is measured from the Bedequally in both directions. For slopes A 1 %, Absorption P dtf! is measured downhill from the upslope edge of the Bed. Rock Bed: 21.0 yd3 or "1.4= 29 ton 6 inches under pipe Mound Sand: 235 yd3 or `1.4= 329 ton calculation based on 3:1 /4:1 slope from top of rockbei Loamy Cap: 87 yd3 or "1.4= 122 ton 6" deep Topsoil: 99 yd3 or "1.4= 139 ton 6" deep INSPECTOR CHECKLIST - mound 4/1U Augusta Street ® WELL setbacks: 20' to pressure tested sewer line (5 psi for 15 min) 50' to everything 100' to dispersal area with shallow well PROPERTY LINES setback: 10' to everything Road setback: platted: 10' prop line. Metes & bounds: out of road easement, or outer ditch. LAKE/ BLUFF setback: 20' for bluff. Lakes: GD _, RD—, NE Protected wetland _. Building setbacks: 10' for everything, 20' for dispersal area. WATER LINE under pressure- se 10' to bed,tank a sewer line. (else sewer tine > 12" below) ❑ Sewer line Et baffle connection (no 90's, 3' between 45's, slope min i" in 8', max 2" in 8') (no depth req's, clean out every 100', Sch 40 pipe) Septic tank and risers (water tight, insulated, proper depth, existing verified by pumping) mfg 2250 gallons none Riser over outlet, riser over inlet or center, and 6"+ inspection pipe over any remaining baffles. No effluent fitter Et alarm Dose tank risers and piping (water tight, insulated, proper depth, drainback) Mfg 1250 gallons dose pump 36 gpm 16 head VERIFY PUMP CURVE 5.3 min ON 9 hr OFF float setting drop 7.5 inches at F25.5gpj "DESIGNED" 4.8 inches approx float tether length 192.0 gal dose divided by gpi "INSTALLED" inches float drop (field corrected LABEL pump requirements and drawdown on riser or panel Cam lock reachable from grade - 30" max, J -hook weep hole. Supply line access (no hard 90's) 2.0 inch supply pipe: Sch40, sloped 1/8"+, supported by 4" sch40 sleeve or compacted, and buried 6"+. splice box / control panel / electrical connections flow measurement: CT, ETM, time dosed, home water meter mound absorption area rough up mound rock dimensions 10.0 X 62.5 Sand lift depth 18 inches. (Jar test : 2" sand leaves < 1 /8" silt after 30 min) ❑ Absorption Sand beyond rock 0.0 upslope 17.0 downslope ❑ Bermed topsoil beyond rockbed 11 upslope 17 sideslope 25 downslope cover depth of 12-18"+ VERIFY 3 laterals (1-2' from edge of rock) 2.00 inch pipe size (Sch40 pipe & fittings) 3.0 ft lateral spacing e 7132 inch perforations 3.0 ft perforation spacing Air inlet at end of laterals, and at top feed manifold if necessary. VERIFY clean outs (no hard 99s) 4" inspection pipe to bottom of rock, anchored VERIFY Abandon existing system - if necessary =Re -use existing tank certification monitoring plan and type well abandonment form - if necessary v 4 Y O Q 2 6 6 0 0 C u O � � O i v 4 Logs of Soil Borings License #810 Location or Project: Lot 10, Blk 1 Borings made by: Rusty Olson's Soil and Pere testing 6/1/2414 Classification System: AASHO ; USDS• USDS-SCS_X Unified ; Other Auger used (check two): Hand X or Power, Flight, Bucket or Probe _X_ Boring Number –1— Surface elevation _995.0 Mottled Soil at-1.7–feet 0"4" Dark brown loam 10yr3/2 H2O present at –X- 6"-12" Brown foam 10yr414 12"-20" Brown loam 10yr5/4 20"-28" Rusty brown loam 1.0yr5/4 Boring Number -2— Surface elevation _995.2 Mottled Soil at -1.5— feet 0"-S° Dark brown loam 10yr3/2 H2O present at _X 6'"-12" Brown loam 10yr4/4 12"-18" Brown loam 10yr5/4 18"-28" Rusty brown loam to clay loam 10yr5/3 Boring Number-3__Surface elevation 993.5 Mottled Soil at -1.7_ feet 0"-12" Dark brown loam 10yr3/2 H2O present at _X_ �0 nn qj �c m rt) U` H L i 'L QI W G d q`p a �• . E> 1W a c -J Q CL L Ca n 9 H "a y c , cgi axi Logs of Soil Borings License #810 Location or Project: Lot 10, Blk 1 Borings made by: Rusty Olson's Soil and Pere testing 6/1/2414 Classification System: AASHO ; USDS• USDS-SCS_X Unified ; Other Auger used (check two): Hand X or Power, Flight, Bucket or Probe _X_ Boring Number –1— Surface elevation _995.0 Mottled Soil at-1.7–feet 0"4" Dark brown loam 10yr3/2 H2O present at –X- 6"-12" Brown foam 10yr414 12"-20" Brown loam 10yr5/4 20"-28" Rusty brown loam 1.0yr5/4 Boring Number -2— Surface elevation _995.2 Mottled Soil at -1.5— feet 0"-S° Dark brown loam 10yr3/2 H2O present at _X 6'"-12" Brown loam 10yr4/4 12"-18" Brown loam 10yr5/4 18"-28" Rusty brown loam to clay loam 10yr5/3 Boring Number-3__Surface elevation 993.5 Mottled Soil at -1.7_ feet 0"-12" Dark brown loam 10yr3/2 H2O present at _X_ I L -6.0 oluWII iudrn I VyI4f4 ?0"-30" Rusty brown loam to clay loam 10yr5/3 Boring Number 4_ Surface elevation !994.7_ 3"-6" Dark brown loam 10yr3/2 Y-12" Brown loam 10yr4/4 12"-22" Brown loam 10yr5/4 22"-30" Rusty brown silty loam 10yr5/4 Boring Number -5— 5urtace ele% 0"'-6" Dark brown loam 10yr3/2 6"'-12" Brown loam 10yr4/4 12"-28" Brown loam 10yr5/4 28"-32" Rusty brown loam 10yr5/4 Boring Number 6 Surface elevation _994.7 0"'-6" Dark brown loam 10yr3/2 6"-12" Brown loam 10yr4/4 12""-20" Brown loam 10yr5/4 20"-28" Rusty brown loam 10yr5/4 Lugs of Soil Borings Mottled Soil at _1.8_ feet H2O present at _X_ Mottled Soil at _2.3_ feet H2O present at _X_ Mottled Soil at _1.7_ feet H2O present at —X— License #810 Location or Project: Lot 10, Blk 1 Borings made by: Rusty Olson's Soil and Perc testing 6/1/2014 Classification System: AASHO ; USDS• USDSSCSTX Unified ; Other Auger used (check two): Hand—X____, or Power , Flight, Bucket or Probe —X— Boring Number _7_ Surface elevation 993.5 Mottled Soil at_1.5_feet 0'"-6" Dark brown loam 10yr3/2 H2O present at –X- 6"-12" Brown loam 10yr4/4 12"-18" Brown loam 10yr5/4 18"-28" Rusty brown loam to clay loam 10yr5/3 Percolation Test Data Sheet Lic4810 Percolating test readings made by: Rusty Olson's Pere. starting at 11:24 A.M. On 711114 Location: Lot 10 Blk 1 Hole number: 1 Date hole was prepared: 6130114 Depth of hole bottom _12 inches, Diameter of hole _6"_ inches. Soil data from test hole: Depth, inches Soil texture 0-12" Dark Brown Loam 10yr312 Method of scratching side wall: Knife Depth of gravel in bottom of hole 2 inches: Date of initial water filling 6130/14 depth of initial water filling 12 inches above the 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 tests 6 inches Time Time Depth Drop in H2O Perc Rate 11:34 11:49 6" 1.2 12.5 11:56 12:13 6" 1.2 12.5 12:14 12:29 6" 1.2 12.5 AVERAGE PERC. RATE 12.5 MPI Percolation Test Data Sheet Lic.#810 Percolating test readings made by: Rusty Olson's Perc. starting at 11:24 A.M. On 711114 Location: Lot 10 Blk 1 Hole number: 2 Date hole was prepared: 6130114 Depth of hole bottom _12"_ inches, Diameter of hole —6"— inches. Soil data from test hole: Depth, inches Soil texture 0-12" Dark Brown Loam 10yr3l2 Method of scratching side wall: Knife Depth of gravel in bottom of hole 2 inches: Date of initiat water filling 6/30114 depth of initial water filling 12 inches above the 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 tests 6 inches Time Time Depth Drop in H2O Perc Rate 11:35 11:50 6" 2.1 7.2 11:55 12:10 6" 2.0 7.5 12:15 12:30 6" 1.9 7.9 AVERAGE FERC. RATE 7.5 MPI Percolation Test Data Sheet Lic.#810 Percolating test readings made by: Rusty Olson's Perc. starting at 11:24 A.M. On 7/1/14 Location: Lot 10 Blk 1 Hole number: 3 Date hole was prepared: 6/30114 Depth of hole bottom _12"_ inches, Diameter of hole _6"_ inches. Soil data from test hole: Depth, inches Soil texture 0-12" Dark Brown Loam 10yr3/2 Method of scratching side wall: Knife Depth of gravel in bottom of hole 2 inches: Date of initial water filling 6/30/14 depth of initial water filling 12 inches above the 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 tests 6 inches Time Time Depth Drop in H2O Perc Rate 11:36 11:51 6" 1.8 8.3 11:54 12:11 6" 1.8 8.3 12:16 12:31 6" 1.8 8.3 AVERAGE PERC. RATE 8.3 MPI Percolation Test Data Sheet Lic.#810 Percolating test readings made by: Rusty Olson's Perc. starting at 11:24 A.M. On 711114 Location: Lot 10 Blk 1 Hole number: 4 Date hole was prepared: 6130!14 Depth of hole bottom _12"_ inches, Diameter of hole _6"— inches. Soil data from test hole: Depth, inches Soil texture 0-12" [lark Brown Loam 10yr3l2 Method of scratching side wall: Knife Depth of gravel in bottom of hole 2 inches: Date of initial water filling 6130114 depth of initial water filling 12 inches above the 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 tests 6 inches Time Time Depth Drop in H2O Perc Rate 11:37 11:52 6" 1.0 15.0 11:53 12:12 6" 1.0 15.0 12:17 12:32 6" 1.0 15.0 AVERAGE PERC. RATE 15.0 MPI Hie _ _ _ r_-- - � _ � � .,� _ .._.w •....d... / / , /% a✓ _ /�_ � rot —��������-�\ i.,,y i � \ ' rrr Ir It °f 1r I `�-��"_�_ `! _ \ "„ ••� , _=:2 ,�flrr �r' I I� J/ / � �Sr � `� *° � ' _ CERTIPICATEOF SURVEY .�. SATHRE-BERiGi1VIST, INC. OROND, rxva�xeusox: -r-'�-1� ',�• MINNESOTA NORTON IIOMPS