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Home My WebLink AboutSeptic design(for subdivision purposes only) � ��o C��a� �<< � � �Q � ui S� o�t1 � �!� SQ S 0�tlt y Rusty Olson's--Soil and Percolation Testing Joseph J. Otson--MPCA License #810 11481 Riverview Rd. NE, Hanover, MN 55341 (763) 498-8779 fax (763) 498-8290 Revised February 09, 2007 Bruce Paddock Proposed Lot 5, Block 2 Tract C, R.L.S. #843 Orono, Hennepin County This on-site Sewage Treatment System is partially designed for a Type 1, five-bedroom home in accordance with the Minnesota Pollution Control Agency Chapter 7080 and local ordinances. Once the house size, location and septic primary and future sites are chosen this design can be completed. The seasonally saturated soils were located at 18"-32"(mottled soil). Due to the seasonally saturated soils, a pressurized Mound System will need to be installed to treat septic effluent. The bottom of the treatment area must be located at least 3'above the saturated soils. 1'he soils at a depth of 12"have a percolation rate averaging ]0 MPI. 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 weatherproof enclosure. A waming device must be installed with a light and sound device;this is in case of a pump failure. Keep all heavy equipment off of the proposed treatment areas before and after construction. The treatroent area must be fenced off before construction begins. This Design is not valid&the System will need to be relocated if failure to protect the areas proposed for the On-Site Sewage Treatment systems occurs. Nothing other than gray water,(laundry,showers,ect.)human water&toilet tissue should be disposed of into the septic tanks. Garbage disposals are not recommended. Additives must no be used,they may cause harmful damage to your septic system. It is recommended that you pump the septic tank every year for 1 tank,every two years for two tanks. CITY OF ORONO Sincerely, SEPTIC PERMIT��i REV��B�_ iN5PECTUIt �"�� PERMIT NtJ.�,,,,.,....,...,,�.. ,,�------- DATE„�- 07 � APPROVfiD AS SUBM1'Tl'ED APPROVEQ WITH CORRECTIOl�1►SHC)?811 Joseph J.Olson � NOT APPROVED-CORABGT�ABSU8MIT Tlsese comn+eaa ate fat�ia6ora►sliao. Ml wak�Mi14t QoM in ti�ll oompliu�co with di applic+�le septie sqd�cai�B eOd�' Itequinsr►eate ineludin�{itomt not spocifiotlly aet.d�Wb��i�M. K6BP'1'H18 ALAN CBT Q2i W'fBA'�t�L[.T�M6S :'e,� ld,: L �N�' �"�.� �` _ � �+�a■a�" . �� 1B"D's —'--------- � / / � . , � i � y � � � ' / r` r� r� /' / i % � � O �� x � � � J � Dy J '� 1.s R� � -i� i � � �� } W 4 J � � ' a -�o} . '-----. J �1 �"� � {��\ / � . W R ...E,�_-i . !cj.fi'1 J_ l� � \� gd/Q_i� w `� S �� i�� M -r �r y � ��3 < 1 �,�� + �= � � � � � 7 � � Y �� L � �+ L� ^j C� �v�s�� v 1` � t- a "f ' y � ,�/ y yC � � .. � - R, � . '��j x 2 ,\ '� � �1 � a e' ��, � � �; �� , � � � � � � � � � � , ; � � -C. _ J A Z - O � w i.'J '� J � v C �'C. C �, a `-' r' `_ a � ,�Y � � p ,, � �, . � � ;, v, p ,�i O .o T ;-- � � n �: � � � .r r. J � � � � . � � � ONS�TE � SCWAGC -��.��. Site A lot 5 block 2 Job#� TRC4TMCNT - �_ PROGRAM .- .- University of Minnesota Mound Design Worksheet Greater than 1%Slopes A. FLOW Estimated 750 gpd(see figure A-1) or measured x 1.5(safety factor)= 0 gpd B. SEPTIC TANK LIQUID VOLUMES Septic tank capacity 3000 gallons(see figure C-1) Number of tanks/compartments 0 Effluent Filter (yeslno} yes C-1 Septic Tank Capacity in Gallons Number of Minimum Capacity with Capacity with Bedrooms Capacity Garb.Disp. Disp.and Lift 2 or less 750 1125 1500 3 or4 1000 1500 2000 5 or6 1500 2250 3000 7,8 or 9 2000 3000 4000 �, SOILS(Site evaluation data) 1. Depth to restricting layer- 2.5 feet 2. Depth of percolation tests= 12 inches 3. Texture loam 4. Soil loading rate(see Figure D-33) 0.60 gpd/ft2 Percolation rate 10 MPI 5. %Land Slope 4.0 % D. ROCK LAYER DIMENSIONS 1. Multiply average design flow(A)by 0.83 to obtain required area of rock layer:Item A x 0.83= 750 gpd x 0.83 ftZ/gpd= 630 ftZ 2, Determine rock layer width =0.83 ft`/gpd x Linear Loading Rate(LLR)(see LLR chart 0.83 ftzlgpd x 12.00 = 10.0 ft LLR Chart Perk Rate LLR <120 MPI <=12 >=120 MPI <=6 3. Length of rock layer=area divided by width= 630.0 ft2 I 10.0 feet= 63.0 ft E. ROCK VOLUME 1. Multiply rock area by rock depth to get cubic feet of rock 630.0 X 1.0 ft= 630.0 fl3 2. Divide ft3 by 27 ft3/yd3 to get cubic yards 630.0 ft3 / 27 = 23.3 yd3 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 23.3 yd3 X 1.4 ton/yd3 = 32.7 tons , � '� � ; � - Page 1 of 5 �� -� �., � ' :? °�' :� R::;� �, �' � � � F. ABSORPTION WIDTH Absorption ratio: � � � ? Absorpfion width equals absorption ratio fimes rock layer width Site A 2.00 x 10.0 ft = 20.0 ft G. MOUND SLOPE WIDTH&LENGTH(Greater than 1%) 1 Downslope absorption width=absorption width minus rock layer width 20.0 feet - 10.0 feet= 10.0 ft 2 Calculate mound size UPSLOPE a.Depth of clean sand at upslope edge of rock layer=3 feet minus distance to restricting layer(C1) 3.0 ft - 2.5 ft= 1.0 ft b.Mound height at the upslope edge of rock layer=depth of clean sand for separation(G2a) at upslope edge plus depth of rock layer(1 foot)to depth of cover(1 foot) 1 ft+1ft+1 ft= 3.0 ft c.Upslope berm multiplier based on land slope(see figure D-34) Selected berm multiplier: 3.45 d.Upslope width=berm multiplier(G2c)times upslope mound height(G2b): 3.45 x 3.0 ft = 10.4 ft DOWNSLOPE e.Drop in elevation=rock layer width(D2)times percent landslope(C5)/100 10.0 ft x 4.0 % /100= 0.4 ft f.Downslope mound height=depth of clean sand for siope difference(G2e) at downslope rock edge plus the mound height at the upslope edge of rock layer(2b) 0.4 ft + 3.0 ft= 3.4 ft g.Downslope berm multiplier based on percent land slope(see Frgure D-34 Selected berm multiplier: 4.76 h.Downslope width=downslope multiplier(G2g)times downslope mound height(G2fl 4.76 x 3.4 = 16.2 ft i.Select greater of G1 and G2h as the downslope width 16.2 ft j.Total mound width is the sum of upslope(G2d)width plus rock layer width(D2)plus downslope width(G2i) 10.4 ft+ 10.0 ft+ 16.2 ft= 36.6 ft k.Total mound length is the sum of upslope width(G2d)plus rock layer length(D3)plus upslope width(G2d) 10.4 fl + 63.0 ft+ 10.4 ft= 83.8 ft Final Dimensions (slope>1%) 36.6 ft x 83.8 ft I hereby certify that all work has been completed in accordance with all applicable ordinances,rules&laws. " (signature) 810 (license#) 12/19l2006 (date) � Page 2 of 5 � �`� � . ... ,�: `_ �� ` �'` ; - � �„� ``�•�.�' H. SAND VOLUME '. Upslope Volume* Volume under rockbed+Downslope Volume Site A a. Upslope Volume:(depth of clean sand+1)x(upslope berm) x(mound length)I 2=ft' 2.0 ft x 10.4 ft x 83.8 ft 12 = 871.5 ft3 b.Volume under rockbed: (average depth of sand under rock)x(rockbed width)x(mound length)=ft� 1.2 ft x 10.0 ft x 83.8 ft = 1005.6 ft3 c.Downslope Volume: (depth of clean sand+1)x(downslope berm)x(mound length)/2=ft3 2.4 ft x 16.2 ft x 83.8 ft / 2 = 1629.1 ft3 Total cubic feet: = 3506.2 ft' 2. Divide ft3 by 27 ft3/yd3 to get cubic yards 3506.2 127 = 129.9 yds3 3. Multiply cubic yards by 1.4 to get weight of sand in tons 129.9 yds3x 1.4 181.8 tons 4 Add 10%for Constructability 181.8 tons x 1.1 = 200.0 tons A-1 Estimated Sewage Flows in GPD No.of Bdrms Class I Class II Class III Class IV 2 300 225 180 60%of 3 450 300 218 the 4 600 375 256 values 5 750 450 294 in the g 900 525 332 Class I, 7 1050 600 370 II or II g 1200 675 408 columns D-33 Abso tion Width Sizin Table Perc Rate Soil Texture Loading Rate Absorption mP� gpd/sq ft Ratio Coarse sand <5 Loamy sand 1.20 1.00 Med.,Fine sand 6-15 Sand loam 0.79 1.50 16-30 Loam 0.60 2.00 31�5 Silt Loam,Silt 0.50 2.40 46-60 Clay loam,Silty 0.45 2.67 or Sand Cla Loam 61-120 Silty or Sandy Clay or Clay 0.24 5 >120' 'Must be other or rformance. � �i .r; -- - _ ' � ��.��"',,.�.�; � 5:;5 � .' ' u. '��f �*yu1,'a: Page 3 of 5 � � `r`'� �� ; + �' � � 4"inspection pipe • Site A � � � 12"topsoil 1.0 riginal grade ' Restrictive layer 2.5 10.4 10.0 ' 16.2 26.2 absorption width Mound Detail: Land slope > 1% 10.4 Upslope berm: ........................................................................ ...............�-----••--�----.............................................................................._.._ Rockbed 10.4 Width: 10.0 10.4 Total Length: 63.0 Width: 36.6 Downslope berm: Downslope absorption width: 16.2 10.0 Total length: 83.8 Notes: Divert surface water away from mound. � 3 �.._: �.. ' .... Page 5 of 5 °:� ` �� . , � . QNS�TE _�..� s��,,,,,�� ,e Site B lot 5 block 2 Job#�] TRlATMlNT _ - -- PR06R/\M -.-�- �. University of Minnesota Mound Design Worksheet Greater than 1%Slopes A. FLOW Estimated 750 gpd(see figure A-1) or measured x 1.5(safety factor)= 0 gpd B. SEPTIC TANK LIQUID VOLUMES Septic tank capacity 3000 gallons(see figure C-1) Number of tanks/compartments 0 Effluent Filter (yeslno) yes C-1 Septic Tank Capacity in Gallons Number of Minimum Capacity with Capacity with Bedrooms Capacity Gart�.Disp. Disp.and Lift 2 or less 750 1125 1500 3 or 4 1000 1500 2000 5 or6 1500 2250 3000 7,8 or 9 2000 3000 4000 �. SOILS(Srte evaluation data) 1. Depth to restricting layer= 2.0 feet 2. Depth of percolation tests= 12 inches 3. Texture loam 4, Soil loading rate(see Figure D-33) 0.60 gpd/ft2 Percolation rate 10 MPI 5. %Land Slope 4.0 % D. ROCK LAYER DIMENSIONS 1. Multiply average design flow(A)by 0.83 to obtain required area of rock layer:Item A x 0.83= 750 gpd x 0.83 ftz/gpd= 630 ftZ 2. Determine rock layer width =0.83 ft`/gpd x Linear Loading Rate(LLR)(see LLR chart 0.83 ftz/gpd x 12.00 = 10.0 ft LLR Chart Perk Rate LLR <120 MPI <=12 >=120 MPI <=6 3. Length of rock layer=area divided by width= 630.0 ft2 I 10.0 feet= 63.0 ft E. ROCK VOLUME 1. Multiply rock area by rock depth to get cubic feet of rock 630.0 X 1.0 ft= 630.0 ft3 2. Divide ft3 by 27 ft3/yd3 to get cubic yards 630.0 ft3 I 27 = 23.3 yd3 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 23.3 yd3 X 1.4 ton/yd3 = 32.� tons � � � �� , �. , ��-::� � '�� :�� , _, Page 1 of 5 ,� '�� `� ' �"` ,#� fr � � v ,� • . �-' F. ABSORPTION WIDTH Absorption ratio: 2 . 1 Absorption width equals absorption ratio times rock layer width Site B 2 00 x 10.0 fl 20 0 ft G. MOUND SLOPE WIDTH 8 LENGTH(Greater than 1%) 1 Downslope absorption width=absorption width minus rock layer width 20.0 feet - 10.0 feet= 10.0 ft 2. Calculate mound size UPSLOPE a.Depth of clean sand at upslope edge of rock layer=3 feet minus distance to restricting layer(C1) 3.0 ft - 2.0 ft= 1.0 ft b.Mound height at the upslope edge of rock layer=depth of clean sand for separation(G2a) at upslope edge plus depth of rock layer(1 foot)to depth of cover(1 foot) 1 ft+1ft+1 ft= 3.0 ft c.Upslope berm multiplier based on land slope(see figure D-34) Selected berm multiplier: 3.45 d.Upslope width=berm multiplier(G2c)times upslope mound height(G2b): 3.45 x 3.0 ft = 10.4 ft DOWNSLOPE e.Drop in elevation=rock layer width(D2)times percent landslope(C5)/100 10.0 ft x 4.0 °/a /100= 0.4 ft f.Downslope mound height=depth of clean sand for slope difference(G2e) at downslope rock edge pius the mound height at the upslope edge of rock layer(2b) 0.4 ft + 3.0 ft= 3.4 ft g.Downslope berm multiplier based on percent land slope(see Figure D-34) Selected berm multiplier: 4.76 h.Downslope width=downslope multiplier(G2g)times downslope mound height(G2fl 4.76 x 3.4 = 16.2 ft i.Select greater of G1 and G2h as the downslope width 16.2 ft j.Total mound width is the sum of upslope(G2d)width plus rock layer width(D2)plus downslope width(G2i) 10.4 ft+ 10.0 ft+ 16.2 ft= 36.6 ft k.Total mound length is the sum of upslope width(G2d)plus rock layer length(D3)plus upslope width(G2d) 10.4 ft + 63.0 ft+ 10.4 ft= 83.8 ft Final Dimensions (slope>1%) 36.6 ft x 83.8 ft I hereby ceRify that all�wk has been completed in accordance with all applicable ordinances,rules&laws. � (signature) 810 (license#) 121191'Z006 (date) E�--.� �''=� � Page 2 of 5 � �,,;' '� a� � �c� � 4 �- � � _ _ H. SAND VOLUME ' Upslope Volume+ Volume under rockbed+Downslope Volume Site B a.Upslope Volume:(depth of clean sand+1)x(upslope berm) x(mound length)I 2=ft' 2.0 ft x 10.4 ft x 83.8 ft 12 = 871.5 ft3 b.Volume under rockbed: (average depth of sand under rock)x(rockbed width)x(mound length)=ft3 1.2 ft x 10.0 ft x 83.8 ft = 1005.6 ft3 c.Downslope Volume: (depth of clean sand+1)x(downsiope berm)x(mound length)/2=ft3 2.4 ft x 16.2 ft x 83.8 ft I 2 = 1629.1 ft3 Total cubic feet: = 3506.2 ft3 2. Divide ft3 by 27 ft3/yd3 to get cubic yards 3506.2 /27 = 129.9 yds3 3. Multiply cubic yards by 1.4 to get weight of sand in lons 129,9 yds3"1.4 181.8 tons 4 Add 10%for Constructability 181.8 tons x 1.1 = 200.0 tons A-1 Estimated Sevrage Flows in GPD No.of Bdrms Class I Class II Class III Class IV 2 300 225 180 60°/a of 3 450 300 218 the 4 600 375 256 values 5 750 450 294 in the g 900 525 332 Class I, 7 1050 600 370 II or II g 1200 675 408 columns D-33 Abso tion Width Sizin Table Perc Rate Soil Tezture Loading Rate Absorption mPi gpd/sq ft Ratio Coarse sand <5 Loamy sand 1.20 1.00 Med.,Fine sand 6-15 Sand loam 0.79 1.50 16-30 Loam 0.60 2.00 31�5 Silt Loam,Silt 0.50 2.40 46-60 Clay loam,Silty 0.45 2.67 or Sand Cla Loam 61-120 Silty or Sandy Clay or Clay 0.24 5 >120' 'Must be other or rformance. ,�� -,,.� ��;>:_;� �� .,� �F� �� ti: , [" . � � ,.,� . Page 3 of 5 {:� ��' , � ��' , - �i"inspection pipe . Site B � � � � 12"topsoil 1.0 riginal grade Restrictive layer 2.0 ' 10.4 : 10.0 16.2 '. 26.2 absorption width Mound Detail: Land slope > 1% 10.4 Upslope berm: ..................................................................................................�-----...---�--...................................................................._...- Rockbed 10.4 Width: 10.0 10.4 Total Length: 63.0 Width: 36.6 Downslope berm: Downslope absorption width: 16.2 10.0 Total length: 83.8 _ Notes: Divert surface water away from mound. Page 5 0 � . �V� t ,� �- ' ' �,�� Logs of Soil Borinqs License#810 Location or Project: Proposed Lot 5, Block 2 Borings made by: Rusty Olson's Soil and Perc testing 12/1/2006 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_978.9_ Mottled Soil at_2.6_feet 0"-32" Dark brown loam 10yr3/2 H20 present at_X_ 32"-50" Rusry dark brown loam 10yr3/2 50"-60" Rusty olive brown clay loam 2.5y4/3 Boring Number_2_Surface elevation_978.9_ Mottled Soil at_2.5_feet 0"-30" Dark brown loam 10yr3/2 H20 present at_X_ . 30"-46" Rusty dark brown loam 10yr3/2 Boring Number_3_Surface Elevation_977.0 Mottled Soil at_2.0_ feet 0"-24" Dark brown loam 10yr3/2 H20 present at_X_. 24"�6" Rusty dark brown loam 10yr3/2 Boring Number 4_ Surface elevation_977.0_ Mottled Soil at_2.0_ feet 0-24" Dark brown loam 10yr3/2 H20 present at_X_ 24"-46" Rusty dark brown loam 10yr3/2 Boring Number 5_Surface elevation_978.0_ Mottled Soil at_2.5_feet 0-30" Dark brown loam 10yr3/2 H20 present at_X_ 30"�6" Rusty dark brown loam 10yr3/2 Boring Number 6_Surface elevation_975.9_ Mottled Soil at_1.5_feet 0-18" Dark brown loam 10yr3/2 H20 present at_X_. 18"-36" Rusty dark brown loam 10yr3/2 � �:. . 7, j r � � , dw61� �i Percolation Test Data Sheet Lic.#810 Percolating test readings made by: Rusty Olson's Perc. starting at 10:30 A.M. On12/11/06 Location: Proposed Lot 5, Block 2 H�le number: 1 Date hole was prepared:12/10//06 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 12/10/2006 depth of initial water filling 12 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 tests 6 inches Time Time Depth Drop in H20 Perc Rate 10:27 10:57 6" 4.5 6.6 11:04 11:34 6" 4.3 7.0 11:43 12:13 6" 4.2 7.1 AVERAGE PERC. RATE 6.9 MPI �� . . .� � � � �� ;`� ��` {' ;� �... � �� a� , r"� !2 � � G� y _� � Percolation Test Data Sheet Lic.#810 Percolating test readings made by: Rusty Olson's Perc. starting at 10:30 A.M. On12/11/06 Location: Proposed Lot 5, Block 2 Hole number: 2 Date hole was prepared:12/10//06 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 12/10/2006 depth of initial water filling 12 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 tests 6 inches Time Time Depth Drop in H20 Perc Rate 10:28 10:58 6" 5.5 5.4 11:03 11:33 6" 5.5 5.4 11:44 12:14 6" 5.5 5.4 AVERAGE PERC. RATE 5.4 MPI �� ,�: �' � '� ,a� �, .. � � Y+K �.' i Percolation Test Data Sheet Lic.#810 Percolating test readings made by: Rusty Olson's Perc. starting at 10:30 A.M. On12/11/06 Location: Proposed Lot 5, Block 2 Hole number: 3 Date hole was prepared:12/10//06 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 12/10/2006 depth of initial water filling 12 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 tests 6 inches Time Time Depth Drop in H20 Perc Rate 10:29 10:59 6" 2.2 13.6 11:02 11:32 6" 2.2 13.6 11:45 12:15 6" 2.2 13.6 AVERAGE PERC. RATE 13.6 MPI 1,, � �„°>."� '� ��arr% ��' /�y,py fyx� �.�;}� ��e„��,,. 'i � �a. Percolation Test Data Sheet Lic.#810 Percolating test readings made by: Rusty Olson's Perc. starting at 10:30 A.M. On12/11/06 Location: Proposed Lot 5, Block 2 Hole number: 4 Date hole was prepared:12/10//06 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 12/10/2006 depth of initial water filling 12 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 tests 6 inches Time Time Depth Drop in H20 Perc Rate 10:30 11:00 6" 2.1 14.3 11:01 11:31 6" 2.0 15.0 11:46 12:16 6" 2.0 15.0 AVERAGE PERC. RATE 14.8 MPI � -- - ;--.� -, ;�,� '- �a � �..��,.: � �':. � � � r � '�-- L � � � , . . ,� . .. . � �'`'