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Home My WebLink About02-27-2020 Septic DesignJoseph Olson D.B.A. Rusty Olson's--Soil and Percolation Testing Joseph J. Olson--MPCA License # 810 11481 Riverview Rd. NF, Hanover, MN 55341 (763) 498-8779 Fax (763) 498-8290 February 27, 2020 John Harris 2445 Woodhaven Drive Orono, Hennepin County To whom it may concern, I was contacted by Elmer J Peterson Company to design the repair for the failing four-bedroom mound system at 2445 Woodhaven Drive In the city of Orono. The results of the inspection and design are as follows. Soil borings indicated that the existing rock bed does not meet the three-foot separation to the periodically saturated soils. The periodically saturated soils were located at 1.0 feet below existing grade. Therefore, the solution is to remove the existing rock bed and any of the sand material under the rock that is not clean. Then replace it with two feet of clean sand and six inches of rock to the proper elevation. The original soils under the uphill side of the rock bed are at elevation. -101.0. There is currently approximately 1.0 feet of sand under the rock bed. The bottom of the new rock bed must be placed at the elevation of 103.1 the bench mark for the elevations is the top of the existing well. The existing tanks will need to be abandoned. The installer wants to remove the existing tanks and place the new tanks in the same area. One new 2250 -gallon combination septic tank and 1000 -gallon lift station. Precaution should be used to make sure the new tanks are greater than 50 feet from the existing well. The existing west property line must be identified before the work can begin. The systems toe must not cross the property line. There is an existing 10x55 foot rock bed to be replaced with a 10x50 rock bed. This will take approximately 17 cubic yards of rock with six inches of rock. The clean sand required will be approximately 37 cubic yards. This number may vary due to the fact that. We don't know how much of the sand will be removed until the rock bed is removed. The sandy loam cap will require approximately 15 cubic yards. The laterals will take 144 lineal feet of two-inch pipe with 1l4 -inch perforations. Clean outs must be installed on the end of the laterals. The topsoil required will be approximately 30 cubic yards. The pump curve is 38 gpm @ 20 feet of head pressure. If you have any questions please call. Sincerely, Joseph J. Olson �v two & o N c 1 1 � �v two & o N 2011 purple code Mound Design www.SepticResource.com (vers 15.2) Property Owner: John Harris Site Address: 2445 Woodhaven Drive. Date: 212712020 PID: 3311823410010 Comments: Replace rock bed and add sand. instructions: = = enter data = adjust if desired = computer calculated - DO NOT CHANGE! 1) bedroom Type 0 Residential System 600 GPD design flow 3) Yes Garbage disposal or pumped to septic 50% larger tank with multiple comp/tanks 4) 2250 Gal Septic tank (code minimum) 2250 Gal Septic tank (design size / LUG req'd) Tank options: none 5) 1.2 GPD/ft2 mound sand loading rate contour loading rate of F12 req's a min 50 ft. long rockbed 6) F 10.0 ft rockbed width 50.0 ft rockbed length 7) 3.0 ft lateral spacing 3.0 ft perforation spacing (maximum of 3 for both) end feed manifold connection 8) Olaterals 48.0 feet long 17.0 perfs / lateral 51 1perfs total (1 /2 a perf means the first pert starts at the middle feed manifold) C)) 1 l4" inch perfs at feet residual head gives 0.74 gpm flow rate per perforation for this pert size Et spacing, Ft pipe size on line 12, max perfs/lateral = 25 line #8 must be less > OK lo) 4.0 doses per day ( 4 minimum) 11) 150 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) 40 feet of 2.0 inch supply line leads to F7 gallons of drainback volume (Tip: "top feed" manifold to control the drainback) 14) 157 gallons TOTAL pump out volume (treatment + drainback) is) 13 feet vertical lift from pump to mound laterals, leads to a: 16) 38 GPM @ 20 feet of head, Pump requirement (note: 550gpm may require an extra 3-6' of head) 17) 500 gal Dose tank (code minimum) 1000 gal Dose tank (design size / LUG req'd) at 25.QQ gpi Leads to a 18) 6.3 inch swing on Demand float, or timed dosing of4.1�hrs min ON (confirm pump rate with drawdown fl (this delivers Average flow, =70% of Peak design ow) 9 OFF test and adjust as necessary) 19) 12 inches from bottom of tank to "Pump OFF" float 20) 18 inches from bottom of tank to "Pump ON" float, orP31 inches to "Timer ON" float if time dosed 21) 21 inches from bottom of tank to "Hi Level" float, or inches to "Hi Level" float if time dosed 22) 475 gallons reserve capacity (after High Level Alarm is activated) 133 ) s) 0.45 gpd/ftz Absorption area Soil Loading Rate, which gives a mound ratio of 2.7 (minimum) (this must match the soil boring log) desired mound ratio 2.7 percent site slope (0-20% range) 0 (% downslope site slope, if different than upslope) 12 inches, or 1.0 ft. to Redox or other limiting condition (need at least 12" to be a Type 1) Treatment zone contains=inches of 0% soil credit, and ®inches of 50% soil credit. Giving a: 24 inch, or 2.0 ft. Sand Lift Mound CRITICAL FOR FUTURE CERTIFICATIONS!ll 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: 3:1 upslope ratio 0 ft. upslope berm 3:1 sideslope 0 ft. sideslope berms 3:1 downslope 0 ft. downslope berm Overall Dimensions: UDslooe berm 1 0 2.0 Limiting Condition �Fd ft. wide by 50.0 ft. long Rock bed ft. wide by 50 ft, long Mound footprint 4" inspection pipe r— 18" cover on top C 12" cover on sides (6" loamy cap do 6" topsoil) Clean sand lift Depth to Limiting ---------------- Absorption Width 1 27.0 - ` - �_ - -.. - - -- - - t Note: For a to 1% slopes, Ahsorptian Width is measured from the Bedequally in bath directions. For slopes >1%, Absorption Width is measured downhill from the upslope edge of the Berl, Rock Bed: 10.0 ft. by §Q.0 ft. by ®inches under pipe, plus 20% gives =yd-' or *1.4= 24 ton Mound Sand: (note: volume is based on 3:1/4:1 slope from top of rockbed, Exchange sand for loamy cap if desired) 19.1 up + 35.2 downslope + 13.6 ends + F41.7junder rock V F —37103 or *1.4= 52 ton plus 20% Loamy Cap: 10 ft, by 50 ft. 6" deep, plus 20% gives 36) Topsoil: =yd-' or *1.4=F--271ton 10 ft. by 5Q ft. 6" deep, plus 20% gives =yd-' or #1.4= 17 ton 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 2/27/2020 Designer Signature Company License# Date Soil Observation Log www.SepticResource.com vers 12.4 Owner Information Property Owner / project: John Harris Date 8/5/2019 Property Address / PID: 2445 Woodhaven Drive Soil Survey Information ❑ refer to attached soil survey Parent matl's: D Till ❑ Outwash ❑ tacustrine 0 Alluvium ❑ organic ❑ Bedrock landscape position: ❑ summit ❑ Shoulder 21 Side slope El Toe slope soil survey map units: 1,2222 slope 5 % direction- Linear Soil Log #1 p Boring ❑ Pit Elevation 101.8 Depth to SHWT 12 orifi Inches Depth (in) Texture fragment % matrix color redox color consistence grade shape 0-12 Fill -'35 1Oyr3/1 Friable Moderate Blocky 12-24 Topsoil <35 1Oyr3/1 Friable Strong Blocky 24-30 Clay Loam <35 2.5y4/3 IOy4/8,1-6/10y Firm Strong Blocky <�5 loose loose single grain 35 -50 friable weak granular blocky firm moderate prismatic platy >50 rigid strong massive <35 loose loose single grain friable weak granular blocky 35-50 firm moderate prismatic platy >50 rigid strong massive Comunents: 2445 Woodhaven Drive Soil Log #2 R11 Boring ❑ Pik Elevation 101.6 Depth to SHWT 12 Inches Depth (in) Texture fragment % matrix color redox color consistence grade shape 0-12 Topsoil <35 10yr3/1 I Friable Moderate Blocky 12-18 Clay Loam <35 2.5y4/3 I Oy4/8,1-6/1 Oy Friable Strong 1310cky <35 loose loose single grain 35-50 friable weak granular blocky firm moderate prismatic platy >50 rigid strong massive <35 loose loose single grain 35-50 friable weak granular blocky 35-50 firm moderate prismatic platy >50 rigid strong massive <35 loose loose single grain 35-50 friable weak granular blocky firm moderate prismatic platy >50 rigid strong massive 2445 Woodhaven Drive Soil Log #3 21 Boring ❑ Pit Elevation 101.9 Depth to SHWT 12 orig Inches Depth (in) Texture fragment % matrix color redox color consistence grade shape 0-8 Topsoil <35 IOyr3/1 Friable Moderate �Block-y 8-20 1 Clay Loam 1 <35 2.5y413 Friable (Strong IBlocky 20-26 Clay Loam <35 2.5y4/3 lOy4/8,1-6/10y Friable Strong Blocky <35 loose loose single grain 35-50 friable weak granular blocky firm moderate prismatic platy >50 rigid strong massive <35 loose loose single grain friable weak granular blocky 35-50 Firm moderate prismatic platy >50 rigid I strong I massive 1 hereby certify this work was completed in accordance with AAV 7080 and any local reqs. Rusty Olson's Soil & Perc 810 Afels,igner Signature Company License #