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Home My WebLink About1993-12-21 Septic System Design ReportS -P TESTING, INC. Steven B. Schirmers — MPCA Cert. No. 627 951 Katydid Lane NE • St. Michael, MN 55376 • (612) 497-3566 December 21, 1993 Dickey site Lot 3, Block 2 Orono, Henn. Co., MN 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 soils on this site are SCS soils mapped - LrC - Lester loam. A seasonally high wa-zer table was located at 12" to 28", (mottled soil). Due to the seasonally high water table, a Pressurized mound System will need to be installed. The bottoin of the rock bed must be located at least 3' above the seasonally high water table. The soils at a depth of 12" have a percolation rate averaging 8.9 min/inch. A pumping chamber will need to be installed to lift the effluent to the tr;,r,tment area. The manifold and supply line pipe must have back drainage to the pumping chamber. The distribution pipes shall have their ends capped. Be sure the rock and sand fill material are clean. The sod layer below the entire mounded area must be turned over, just break up the sod, be sure not to over work. The power supply and switches must be located outside the manhole and pumping chamber in a weather proof enclosure. A warning device must be installed with a light and sound device, this is in case of a pump failure. Mercury floats are a good method. All neighboring wells are located greater than 100' away from the proposed treatment area. CONT'D Dickey site Lot 3, Block 2 Orono, Henn. Co., MN (2) Keep all heavy equipment off of the proposed treatment area before and after construction. The treatment area should be marked off before construction. This Design is not valid & the System will need to be relocated if failure to protect the areas proposed for On -Site Sewage Treatment occurs. 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 waste & toilet tissue should be disposed of into the septic tanks. Garbage disposals are not recommended. Smaller amounts of laundry soaps, dish soaps, cleaning agents, etc. are better for the system. Antibacterial soaps & chlorine agents may kill the bacteria needed to treat septic effluent properly. Additives are not recommended, they may cause harmful damage to your system. Recommend to pump & clean your tanks by a certified pumper every year if you have 1 tank & every 2 ;ears if you have 2 tanks to insure proper maintenance. teven A76Schirmers OS SBS/ds J O F m m r m D 0 z f/1 m 3 � 3 LD n A O Q N - ^z n 'i S' r� � N OWW 41, 33033 3 — vo N N ° lov z p N v � M I O Ci c � :i7 i - m r m D 0 z MOUND DESIGN WORKSHEET (For Flows up to 1200 gpd) A. FLOW Estimated -) s o gpd (seepages D-7 or I-3, 4, 5) or measured gpd x 1.5 = — B. SEPTIC TANK LIQUID VOLUMES J -; goc3gallons (see pages 3 or C-5; C. SOILS (refer to s.:e evaluation) 1. Depth to restricting layer = 1 a �v v' inches 2. Depth of percolation tests = 1 a " inches 3 Percolation rate q ,r 1 mpi Land slope % 13n1rrcd sewSe Flows In Galium per ay (9d) c.Ne4per '!os •, R201001ef ��n M=m main Mrn a 1 co.n/ save -- of iypc I Type II 7ypc III IAO N*oomt "M said» *A 2.00 fV 2 306 223 ISO Ll:: 3 456 300 219 M 4 600 375 256 r 5 75C 450 2W 6 900 S2S 332 Tr 1. 7 1050 600 370 Ga S 1200 1 675 1 401 �+... S,V Ur T.ab Cap" rim In Nor \rakrrd al�►./.;r4 Lq.Wr7w+Y.Y Bdn.r. c4rr.ry pbw d -F -W 1 w kw 750 1125 3:4 1000 llw 4�6 13W 2270 7.4 ar 1 30M 300D D. ROCK LAYER DIMENSIONS 1. Multiply flow rate by 0.83 to obtain required area of rock layer: Daily Flow x 0.83 = ' 'J gpd x 0.8.3 sq. ft./gpd = so. ft -i )o`er (r,%`+" 2. Select uridth of rock layer 00 feet or less) _ 16 ft. 3. Length of rock layer • Area + Width = LYLf sq. ft. + Zo ft.= coV ft. E. ROCK VOLUME I. Multiply rock area by rock depth to get cubic feet of rock; � sq. ft. x lx,� ft. - _v)1fS cu. ft. 2 Divide cu. ft. by 27 cu. ft./C?. --rd. to get cubic yards; r�&cu. ft. + 27 - __,-o ' _ cu. yd. 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 'D n cu. yd. x 1.4 ton/cu. yd. _ 1 -i? tons. F. ADSORP 1ON WIDTH L01I w 1 1. Percolation rate in top 12 inches of soil is mpi 2. Select allowable soil load in rate from table on page E-; .0 gpd/ft2 3. Calculate adsorption width ratio by dividing rock layer loading rate of 1.20 gpd/ft2 by allowable soil loading rate; 1.20 gpd/W4- . u, gpd /ft2= _ a . l.? Check this value on page E -I6. 4. Multiply adsorption width'ratio by rock layer width to get required adsorption width; I a,x -)L.1) ft s ft i ?�}Tfh?tJi��.'ZT�:tlilt2lT1:tl Abp W;em Width swngTubp: r.Robd=fir. � wnt Soil Tea c.Ne4per '!os •, R201001ef ��n M=m main Mrn a 1 co.n/ save -- — W a s 940/ 1.30 IAO 0.1 IDS N "M said» *A 2.00 f I2Ao »1330 Ll:: l0 310043 31M 1. Ims M 7.40 46 Lasso021 OAS 2S? ti01.120 500 l3. uUVVNbLUM ul2\1-VV r -1►-i I. if landslope is 3% or more, subtract rock layer width from adsorption width to obtain minimum downslope dike toe for absorption: ft -eft=_ 'L feet 2. Calculate minimum mound size based on geometery: a. Determine depth of clean sand fill at upslope edge of rock layer: Separation � , U feet b. Multiply rock layer width by landslope to determine drop in elevation; Slope Difference limp" ) 0 x _ - % + 100 = _L feet ��-- c. Add depth of clean sand depth of clean sand for +i~l- oA- �+�-- separation at upslope edge (2a) to depth of rock lay<°r to IA -#W rock depth and the depth of cover to find the total niuund height at upslope edge of rock layer; a.0 ft+ 1 ft+1 ft=_LLQ feet d. Enter table on page bottom with landslope and upslope dike ratio. Select dike multiplier of �.115 e. Multiply dike multiplier by upslope mound hs-i-Im to get upslope dike width: 4 .0 x 3,n = !'S ret f. Add the depth of slope difference (2b) to the upslope height to get the downslope height H , u +, Le - 4 • (, feet g. Enter table on page bottom with landslope and downslope dike ratio. Select dike multiplier of a h. Multiply dike multiplier by downslope mound height to get downslope dike width: 4 . L x S zj = _k!4L_ feet i. Cor�-are the values of sten " 1 and Step G -2-h. Select the gr. .er of the two value. ! downslope dike width; �-�1 feet j. Total mound u idth is the sum of upslope dike width plus rock layer width plus dowr.s!ope dike width; ft + I 0 ft + ft UP,1- k. Total mound length is the sum of upslope dike ,-!idth plus rock layer length plus upslope dike width; - �y--- ft i• -_� ��-- f t + L _.- ft = a1 `(-- feet 7 L4S -{ �I Q6 11 LI - M„: a{capc k1 6;1 7:1 11 L1 S.1 kt 7:1 SA 1 dem 0 JO 1.0 5_0 10 74 30 1.0 S.0 60 7.0 10 1 JA 6.17 536 6.3t 79,1 291 3 a 176 5.Y 651 7AI 2 1.19 615 $36 6.82 614 263 1110 I34 S36 111 6.90 3 330 131 S06 731 666357 43S S01 5.79 6AS / 341 6.:6 62S 7►9 +'.72 :nr 34i •..7 aU S 3.i3 Soo 667 57 1: : nl 3 33 100 : /J S 19 5.71 6 116 526 7.11 93t 1207 251 3.23 3 L Il./.9. 511 7 310 6.56 LI$ 1L . 1313 1" 3.12 x.70 6 n 1.70 5.11 1 3.9S S# W 1156 15-91 212 303 1S7 /OS /.M /JJ) 9 1,11 425 9.00 13.06 1192 2 36 2.91 3.6S 3.90 130 IAS 10 12q 467 100 15A0 2333 231 216 31) ? 73 /.1. 6.11 11 446 7.11 11 11 17LS 3013 226 270 3.23 341 3.95 126 12 4b9 7.N 1251 1143 4375 721 770 312 349 380 LO A. Determine pump capacity: Gravity Distribution 1. Minimum suggested is 600 gallons per hoe., � 10 hpm) to stay ahead of wader use rate. 2. Maximum suggested for delivery to a drop box of a home system e a gallons per hour (45 gpm) to prevent build-up of pressure in drop bo... Pressure D4lrlbutiloa 3. a. Select nuw&wrof pe'nwated laterals b. SdW perforation spacing '3_ it. c. Subtr :t 2 ft. from the rock layer length. -2ft. ft. d. Eleterrnine the number of spaces between perforations. Un.0 per- spacing = _rJic._ ft- + 1-ir.- ft. _ -R1_ spaces e. a a- spaces + 1 a S-L.i,_ perforations/lateral f. Multiply perforations per lateral by number of laterals to get total number of perforations. rfwiti.�. x ...1L2 perforations. PW SELECtED PUMP CAPACITY •L gpm B. Determine head requirements: 1. Elevation difference between pump and point of discharge. fee! 2. If pumping to a pressure distributiri� system, add five feet for pressure .,quired at manifold s feet 3. Friction loss a. Enter friction loss table with gpm and pipe diameter. Read friction loss in fee! per 100 feet from table. F.L = . a . k ft./100 ft of pipe b. Determine total pipe length from pump to discharge point. Add 25 percent to pipe length for fitting loss, or use a fitting loss chart. Equivalent pipe length -1.25 times p�c length - I Dx1.2= lsl. feet c. Calculate total friction loss by multiplying friction loss in ft/100 ft by equivalent pipe length. Total friction loss= :) . L x 1 S b +100 �_ feet Total head required is the sum of cic►'ag on difference, special head requirements, and total f7-- -tion loss. -I + ! + 4_ (1) (2) (3c) TOTAL HEAD_ feet C. Pump selection 1. A pump must be selected to deliver at least _250- gpm (Step A) with at least feet of total head (Step B). DO rEWORATWN OF A PEYW RATED LATERAL e,.. cn. Ty.d New a" low up « � vs. w L^W _ .. � .wrs :i'in'"'"'' TABLE OF POUK RA71l]P1 DOCHAVAM IN GM Had Paints" diewow0whM 1.3 inch V. ,/4 tae M ON is Oi! 090 2Ab Wo 101 2.5 on 1.17 3.0 098 IJs 40 1.13 IA? SA 1.76 Lid RUG* 1.0 W dletad !or "sWntlet gelear bU t 20 feet d hud Los other asublishomb Pipe LAmSth Paint of Discharjc T/CL` ETZ77"' auon Diffcmnce 9" r F -18b 1.3 inch 2.0 inch 3.0 inch Spm rrkam kw PW 100 h «P44 10 f 0.20 12 0.96 0.28 14 1.25 0.38 16 1.63 0.48 18 2.03 0.60 20 2.47 0.73 0.11 25 3.73 1.11 0.16 30 5.23 1.55 0.23 35 7.90 2.06 0.30 40 11.07 2.64 0.39 45 14.73 3.28 0.48 5o 3.99 0.38 SS 4.76 0.70 60 5.60 0.82 Location or Proiect Dickey site __Lat__3,_a1ock 2. Orono Borings made by ,-P ';.,sting, Inc. Steve Schirmers Date 11-22-93 Classifiction System: AAS:iO USDA -SCS X Unified Other Auger used (check two) : Hand X or � c•::er, Flight , or Bucket_ X DeFth, Boring number 1 Depth, Boring number 2 in in feet Surface elevation 996.5 feet Surface elevation 998.3 - --- — - 0 - -- - Topsoil dark brown loam Topsoil dark brown loam 0 - 1' -MOTTLED 1' 0 2" - Brown clay loam Rusty olive brown 1'2" - 1'8"-M0TTLEp,.„ clay loam 2 - 2 - Rusty olive brown 1' - 2-1/2' clay loam 1'8" - 2'10" 3 - Rusty olive gray 3 - 11 Rusty 2'10" - 3'4" 8Idvel8d90 4 - 5 - 6 - 7 - clay loam 2-1/2' - 4' Rusty olive gray '_oam 4' - 5' End of boring at 5' feet. Standing eater table: present at 2-1/2'feet of depth, 18 hours after boring. Not present in hole Mottled soil: Observed at it feet of depth. Not present in hole Comments: 4 - 5 - M 7 - r•Im Rusty olive gray loam '4" - 5' End of boring at 5' feet. Standing water table: present at 3'7" feet of depth, 18 hours after boring. lot present in hole Mottled soil: Observed at 1�8" feet of depth. Not present in hole Comments: Loca-ion or Project Dickey site, lot3, block 2, Orono Bori..gs made by S -r '.,-;ting, Inc. Steve Schirmers Date 11-22-93 Classifi.ction Sy3tem: AASNU USDA -SCS X Unified Other Auger used (check t%..o): hand X or Power, flight or Bucket X Dept:, Boring num;:er _ 3 Depth, Boring number 4 in in feet Surface elevation 997.3 feet Surface elevation 1005.7 Topsoil very dark brown loam Topsoil dark brown 1 - 0 - 1'2" -MOTTLED 1'2" 1 - loam Rusty very dark brown loam 0 - 1'10" -MOTTLED 191 2 -1'2" - 2'2" 2 - Rusty 1'10" - 2'2" dlgkmgray Rusty olive brown 3 - Rusty gray clay 3 - clay loam" loam 212" - 314" _ _ Rusty olive gray 4 212" - 414" loam Rusty gray loamy sand 5 _ 414" - 5' _ 314" - 5' 6 - 7 - I:nd of boring at 5' feet. Staniuing eater table: present at 111119 feet of depth, 18 hours after borinq. Not present in hole Mottled soil: Observed at 1'2" feet of depth. Not present in hole Comments: 6 - 8 - End of boring at 5' feet. Standing water table: present at feet of depth, hours after boring. Not present in hole X Mottled soil: Observed at 1'10" feet of depth. Not present in hole Comments: Location or Project Dickey site, Lot 3, Block 2. Orono Borings made by 'ostinq, Inc. Steve Schirmers Date 11-22-93 Classifiction System: AASHO USDA -SCS X Unified Other Auge_ used (check two) : Hand- X or Power, Flight or Bucket X Depth, Boring number 5 Depth, Boring number 6 in in feet Surface elevation 1007.6 feet Surface elevation 1005.0 J- - - ---- - 0 - - — Topsoil dark brown loam 1 1 - Topsoil dark brown 0 - 1'4" -MOTTLED 184" loam Rusty 114" - 1'8" daftagray 2 - M 4 - 5 - 6 - 7 - 8 - Rusty olive brown clay loam 1'8" - 3'10" Rusty olive brown loam 3'10" - 5' End of boring at so feet. Standing %later table: present at 4-1/2' feet of depth, 18 hours after boring. Not present in hole Mottled soil: Observed at 1'4" feet of depth. Not present in hole Comments: 2 0 - 2'4"-MOTTLED2'4" Brown 2'4" - 2'10" clay loa 3 - Rusty olive brown 4 - clay loam 2'10" - 4-1/2' Rusty olive gray loam 4-1/2' - 5' t P' 7 - 8 - End of boring at ,SI feet. Standing water table: present at — feet of depth, hours after boring. Not present in hole Y Mottled soil: Observed at 2'4" feet of depth. Not present in hole Comments: CERT.;;00627 PERCOLATION TEST DATA SHEET S–P Testing, inc. 11-23-93 9:25 Percolation tc,t reading madr b,,un—�tanim_ at Lot3,B1k.2,Dickey site 1 11-22-93 Test hole location .Hole number .Date hole a as prepared Depth of hole bottom 12 inches. Diameter of hole 6 inches Soil data from test hole: Depth. inches Soil texture 0 - 12" Topsoil dark brown loam Method of scratching sidewall Knif e Depth of gravel in bottom of hole 2 inches 11-22-93 3:30pm 12 Date and hour of initial water filling . 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 Mi t-nma t i r siphon . Maximum aaterdepth above hole bottom during test 6 inches ime Time interval, minutes Measurement. inches Drop in water level, inches Percolation rate. minutes per inch Remarks 9• 1 6 9:25 9:55" 2-7/8 10.4 30 min 10.05 I 10:35 10.9 " 10:48 11:18 2-11/16 10.8 " II I Percolation rate = 10 - R minutes per inch. %ERT.#00627 PERCOLATION TEST DATA SHEET Percolation test made h\ S—D—. T@r,*;nq' l;nn- _on i i-_��_93 starts,,_ at • �7 m Test hole location Lot 3 , B1 k . 2 ,Dickey site Hale n.imber 3 Date hole was prepared 11-22-93 Depth of hole hotimn 12 inche,. Diameter ,1f hole 6 inches Soil data from test hole: Depth. inches 0 - 12" Soil texture Topsoil very dark brown loam Method of scratching sidewall KP if a Depth of gravel in bottom of hole 2 inches 11-22-9&3g3 12 12 Date and hour of initial water filling pt ii of t tttal water filling inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours Automatic siphon 6 (Maximum water depth above hole bottom during test inches Time ime i interval. minutes Measurement. inches Drop in water level. inches Percolation rate, minutes per inch Remarks 9:02 pref111 6 9:27 9:57 2-3/16 13.7 30 min 10:03 10:33 " 2-1/16 14.6 " " 10:50 11:20 " 2-1/16 14.6 of " I I _ Percolation rate = 14.3 minutes per inch. CERT.4V00627 PERCOLATION TEST DATA SHEET Percodatikmtest readin,_smideh� S—P Testing, Inc. 11-23-93�tarting:u 9'28 Test hole location Lot 3 , B 1 k . 2, Dickey site Hole numtxr 4 Date hole was prepared 11-22—f 3 Depth of hole bottom 1 2 inches. Diameter of hole-6inches Soil data from test hole: Depth, inches Soil texture 0 — 12" Topsoil dark brown loam Method of scratching sideu all Knife Depth of gravel in bottom of hole 2 inches 11-22-93 3:30p 12 Date and hour of initial eater filling . 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 Automatic siphon , Maximum %%ater depth above hole bottom during test 6 inches ime Time interval. minutes Measurement. inches Drop in water level. inches Percolation rate, minutes per inch Remarks 9:02 pref111 6 9:28 9:43 3-5%8 4.1 15 min 10:02 10:17 i 3-7/16 t 4.4 10:51 11:06 I I 3-3/8 I 4.5 Percolation rate = 4.3 minutes per inch. CERT.#00627 PERCOLATION TEST DATA SHEET Percolation test readinesnii&he S—P Testing, Inc. on 11-23-93�taningat 9:26 Lot3,B1k.1,Dickey site 2 11-22-93 Test hole location .Hole number .Date hole was prepared Depth of hole bottom 12 inches. Diameter of hole 6 inches Soil data from test hole: Depth. inches Soil texture 0 — 12" Topsoil dark brown loam Method of scratching sidewall Knife Depth of gravel in bottom of hole—_-L—inches 11-22-93 3:O�m12 Date and hour of initial water filling . Dept o tmtial water filling 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 test inches : ime Time interval. minutes Measurement, inches Drop in water level, inches Percolation rate. minutes per inch Remarks 9:02 pref111 6 9:26 9:56 2-11/16 11.2 30 min 10:04 10:34 " 10:49 11:19 " `! I I 1 Percolation rate = 11.2 ,minutes per inch. CERT. -00627 PERCOLATION TEST DATA SHEET Percolation ie,i readiligN niade by S—P Testing, Inc. 11-23-93 9 : 29 tilt 011 .tartin_ a► Lot3,B1k.2,Dickey site 5 11-22-93 Test hole location . Hole numoer . Date hole was prepared Depth of hole bottom 12 inche,. Diameter of hole 6 inches Soil data from test hole: Depth. inches Soil texture 0 — 12" Topsoil dark brown loam Method of scratching sidewall Depth of gravel in bottom of hole 2 inches 11-22-93 3:30pm 12 Date and hour of initial water filling . 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 Att tnmat i n c iphnn . Maximum water depth above hole hottom during test 6 inches ime Time interval, minutes Measurement. I inches Drop in water level. inches Percolation rate. minutes per inch Remarks 9.02 Drefill 1 6 9 . 9 ' 9. 9 _ min 10.01 10.31 1 Percolation rate = 9 - 4 minutes per inch. CERT.#00627 PERCOLATION TEST DATA SHEET S -P Testing, Inc. 11-23-93 9:30 m1 Percol:-' te,t readincs made b%_— on startim_ at Tts' Test hole :-ration Lot3 , Blk . 2 , Dickey site Hole number 6 Date hole %%asP ' P' rc ared 11-22-93 Depth of hole bottom 12 Anches. Diameter of hole 6 inches Soil data from test hole: Depth, inches Soil texture 0 — 12" Topsoil dark brown loam Method of scratching sidewall Knife Depth of gravel in bottom of hole 2 inches Date and hour of initial water filling 11-22-93 l pt optnttial 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 6 Maximum Hater depth above hole bottom during test inches ime Time interval. minutes Measurement, inches Drop in water level, inches Percolation rate. minutes per inch Remarks 9:02 pref111 6 9:30 9:45 of 1 4-1/4 3.5 15 min 10:00 10:15 " 10:53 11:08 " 1 Percolation rate = 3 • 5 minutes per inch.