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HomeMy WebLinkAbout1993-12-16 Septic System Design Reporttit / S.V !# a SEPT»'’ crry of orono APPROVAL CITY of C* MMridpriOaai PMtOHIntaifCnfMBvftMtaMUSr LOCATION; Brian and Nancy SiskaOWNER: GENERAL CONTRACTOR: Peter Andrea SEPTIC CONTRACTOR:_______________ SITE EVALUATOR: Testing ___REPORT DATE: December 16, 1993 The City of Orono has Approved (approved-disapproved) with Che following comments:______________ ^ your on-sUe system design as of June 2. 1995 (date) THIS IS NOT A PERMIT. This is a design approval form which must accompany the site plan. A permit must be issued to a licensed septic contractor prior to installation. A list of currently licensed s^c contractors is enclosed. NOTICE TO INSTALLERS: Any changes to the approved plans and specs must have prior approval of the Inspector (473-73S7). Call for inspections 24 houra in advance. ALL DRAINFIELD AREAS MUST BE FENCED OFF prior to building site excavation and fencing must reiuain in place until final site grading. Approval to pour footings will not be granted until the Inspections Department has verified that primary and alternate sites are adequately protected. NO VEHICULAR TRAFFIC OF ANY KIND (cars, trucks, earth moving equipment, etc.) is allowv i within 20* of tested drainfield sites either before or after system cofL:truction. Compaction of these areas could render them unusable prohibiting the timely completion and or limiting the long term use of the property. A site copy will be available at the City Offices for the septic contractor. CITY OF ORONO Steph^WdbmianI. On-site Systems Manager TEUEniONE-47}.7)S7 • mX-41MSie ■ S-P TESTING, INC.Steven B. Schirmers — MPCA Cert^. 027 951 Katydid Lane NE • St. Michael. MN 55376 • (612) 497-3566 December 16, 1993 Coffin site Lot 10, Block 1 Orono, Henn. Co., MN This On-Site Sewaqe 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 - LrB - lester loam. A seasonally high water table was located at 20” to 34", (mottled soil). Due to the seasonally high water table, a Pressurized Mound System will need to be installed. The bottom of the rock bed must be located at least ?' above the seasonally high water table. The soils at a depth of 12" have a percolation rate averaging 3.8 min/inch. A pumping chamber will need to be installed to lift the effluent to the treatment 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 neigh’ ng wells are located greater than 100' away from the proposed t vument area. The existing well on this site will need to be abano^/ued. CONT'D Coffin site Lot 10, Block 1 Orono Keep all heavy equipment off of the proposed treatment area before and after construction. The treatmer ^rea 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 mainit problem in treating septic effluenv this system should have no -ively. Nothing other than gray water, (laundiv 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 years if you have 2 tanks to insure proper maintenance. SBS/ds r°wAU _ 24| - vEGG �&.' � »slam§m z|&\oI$ C, §i3 rn . �n� 0 f} Az . oa i■ . @ -36 tI. «� i ' I > ,J /\ i �, 2 ©� k !/ • � !� ! f /� f� 1/� /� < \• . !. - -- - I 666 hl:z 16 b - R—-- ---, ' o .le -�---�--- � � !w CD Iƒ ■ `� \ § \ ;' ®IN,» � ` ( © � a7( it $ 22 n ( fin§ g d7 27 ± $.� } m \ m � © t ll, 3, f n .A• • 1 1 -� S S 2 S < = AWN—r 0 m (n (r'i fig in R1 rr� r j = R1 �i r � L w 'Zy n x O C I rn MOUND DESIGN WORKSHEET (For Flows up to 1200 gpd) A. FLOW Estimated gpd (see pages D-7 or 1-3,4,5) or measured ^ gpd x 15 =* —_______. B. SEPTIC TANK LIQUID VOLUMES % 1^/000 gallons (seepagesC-3oi C-5) C. SOILS (refer to site evaluation) 1. Depth to restricting layer » 2. Depth of percolation tests = 3. Percolation rate 4. Land slope _ IX inches . inches 1 _mpi % JV-. w C,ov\-TM EaiMM4 FiDwa ia CaluM for itHi l»mm ti Rttnmmi TV»«I lywii Tmm Tr 2 MO 22S no J 300 211 4M 4 «00 373 230 OW S 730 430 394 to«MO 323 332 riml 7 lOM 400 370 umm•1300 •73 400 ■i liatkTMik b laaNM MuubmM Ln.tal J eafmHf vitft C^iqr m iia l«4 MOB im4«4 WO tm T.lar*aw««•— D. ROCK LAYER DIMENSIONS 1. Multiply flow rate by 0.83 to obtain required area of rock layer: Daily Flow x 0.83 » gpdX0.83sq.ft./gpd« sq.ft.*^ 2. Select width of rock layer (10 feet or less) = /o ft. 3. Length of rock layer « Area Width « sq.ft.» /Q ft a ft.Rock Bed E. ROCK VOLUME 1. Multiply rock area by rock depth to get cubic feet of rock; U/hL sq. ft. X ft. ■ 0)^ cu. ft. 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; ^i</cu.ft. ♦ 27■ cu.yd. 3. Multiply cubic yards by 1.4 to get weight of rock in tons; in cu. yd. X 1.4 ton/cu. yd. * 3^ tons. duk siort F. 1. 2. 3. ADSORPTION WIDTH Percolation rate in top 12 inches of soil is mpi Select allowable soil loading rate from table on page E-; .MvT gpd/ft* Calculate adsorption width ratio by dividing rock layer loading rate of 1.20 gpd/fp by allowable soil loading rate; 1.20gpd/ft»^oHilgpd/ft*- . Check this value on page E-16. Multiply adsorption width ratio by rock layer width to get requir^ adsorption width; AtwrflliB WIddi ShfcunWt ^ft 1. If landslope Is 2.9 pciccnt or Ict^ basal width indudes both the upslope and downslope dike widths, Z Calculate minimum mound size based on geometery: a. Determine depdi of dean sand fill at uiMlope edge of rock layen Se/wation /.!_ feet b. Multiply rock layer width by landslope to determine drop in elevation; Slept Difference ^ X — %-t»100« — feet c Add depth of dean sand depth of dean sand for separation at upslope edge (2a) to depth of rock layer to rock depth and the depth of cover to find the toul mound height at upslope edge of rock layer; y.7 ft^ lft»lft«3.3 feetSo»^04 d. Enter table on page bottom with landslope and upslope dike ratia Select dike multiplier of H_____. e. Multiply dike multiplier by upslope mound height to get upsiopedike vddth: ~3-3 x ^ = 1*^ feet f. Add die depth of slope difference (2b) to the upslope height to get die downslope height - g. Enter table on page E-18 with landslope and downslope dike ratio. Select dike multiplier of h. Muldply dike multiplier by downslope mound height to get downslope dike width:__- x feet i. Mininmum mound width is the sum of upslope dike width plus roc^ layer widm plus doumslope dj^^^ j. Subtract the Minimum width G.i from the Absorption width F.4 to find the Additional Downslope required for Absorption ft ft. -fwt k. Add the Additional Downslope required for Absorption to the downslope dike width and recalulate the Total "" - - • * Mound Width which is is the sum of upslope dike Vto^>V width plus rock layer width plus downslope dike width ^ ‘ l:t ft4 ;o ft^ ]•! ft = feeti90^-ru I* 'Ha' 1. Total mound length is the sum of upslope dike width plus rock layer length plus upslope dike width; _r3 ft*^_LV ft + _/u_fl= HO feet M at dowMIaiw 4cl 7:1 kl 4:1 -t^ kl 7:1 M 0 la 40 10 10 7.0 10 4.0 10 40 7D 10 I i»417 S34 414 7 51 2«1 }«1 474 144 454 741 3 ji*4J«55.1 4*3 ■ 14 2*5 J-0 4:4 514 4 14 t JA-:45;rt:»7 7;.• •:4"'5 m 5 7.^45 4 ail 47*4Zi :.»i v:2 3m 3 45 417 4M 544 4U4 S 351 SO)447 157 liJ77 341 131 4UU 442 11*$71 4 3i4 124 7.14 «Jt 1307 214 321 IIS 44t 443 541 7 IJO 114 744 1034 1171 241 112 170 421 470 SII•l.tS IM 131 1114 1541 2.43 3!0 157 405 4.4*4J5«4.11 42S *0*1304 1*42 314 2«4 145 140 410 445 43«♦ C :co I5fl0 3131 311 3*4 111 ITS 413 444 n 4U :i4 ::ii 1745 3i:4)3 34 2;*121 1.41 1«5 424 u 444 74*1210 2U1 4171 221 270 113 14*140 4i» m mm ( WJMPSBLICTIQN A. DctemfaitpwRpcapadtyi j ,{#:•( Ml] •/LE Gmily DitIrlbulSon 1. Mlnlmuimiigyiiwlit600gallootpgrhour(10gpm)loiUyhMKtol water UM rale. 2. Maximum fuggeiled for delivery to a di^ box of a home system if 2700 galions per hour (45 gpm) to prevent build-up of pressure in drop box. 00 wwoawiox V A rearoaiiiD uuhim . Pressure Disiribulloa 3. a. Select nuiriberof perforated laterals, b. Select perforation spacing • ~L Subtract 2 ft from the rock layer length. - 2 ft - Jik. ft- e. f. Determine the number of spaces between pe^rations. Length perf. spacingft ♦JL-. ft* spaces .spaces♦ 1 ■ * perforatioits/latcral Multiply perforations per lateral by number of laterals to get tc^ number of pffforations. ^ -----perforations. •» gpm. SELECTED PUMP CAPACITY.gpw B. Delenninc head lequiiements: 1. Elevation difference between pump and point of discharge. ^ fret 2. If pumping to a pressure distribution system* add five feet for pressure icquir^ at manifold 5" feet 3. Friction loss a. Enter friction loss table with gpm and pipe diameter. Read friction loss in feet per 100 feet from table. F.L. - ft./100 ft of pipe b. Determirre total pipe length from pump to discharge point. Add 25 percent to pipe len^h for fitting loss* or use a Htting loss chart. Equivalent pipe length -1.25 times pipe length » I - J X 1.25 * / 'y ’■ feet c. Calculate total friction loss by multiplying friction loss in ft/100 ft by equivalent pipe length. Total friction loss * • .x / - -t-lOO =__y. Total head required is the sum of elevation diflcretvje, special head requirements* and total friction loss. r (1) (2) TOTAL HEAD _ <3c) feet C. Pump selection 1. A pump must be selected to deliver at least with at least feet of total head (Step B). j_gpm (Step A) Hum tar iM* ssTr&'sur TAMJOFPIIFOIIAIION OOCHAIICBMCPM Hmt V.V. iJOi OSS SJ4 U OiS a« ijOb OJO IjM 2S OJS 1.17 SjO O.W 111 4j0 I.U U7 SjO IM US aUe UHbot oOmd far Midmital ^UciM. Pipe Length Pun'ofDiiciMm —— ’-Tc-jr Eteveiion DifToaiM 1 F-lIb gpm IJinch 2.0inch S.Oindi FrioioR taM l»a if 10 0.20 12 0.96 0.28 14 1.28 0.38 Ifi 1.63 0.48 18 2.03 0.60 20 2.47 0.73 0.11 2S 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 4S 14.73 3.21 0.41 50 3.99 0.58 55 4.76 0.70 60 5.60 0.82 /il i ■ *• 10-24-93 Location or Project Coffin site » Lot 10» Block Orono Borings made by S-P Testing# Inc. Steve Schirmers_ _ _Date_ _ _ _ _ _ _ _ Classifiction System: AASHU_ _ _; USDA-SCS_X_t Unified_ _ _; Other_ _ Auger used (check two): Hand X , or Power_ _ _, Flight_ _ _, or Bucket, Depth, in feet 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - Boring number. Surface elevation 997.2 Topsoil dark brown loam 0 - 1*4" Brown clay loam 1'4" - 2-1/2*-MOTTLED 2-1 Rusty olive brown clay loam 2-1/2* - 4* Rusty olive brown loam 4* - 5* End of boring at 5*f eet. Str,ndi:.:j './a tor present at_ _ _ _ _ feet of depth. _ _ _ _ _ _ hours after boring. Not present in hole_ _ _X_ _ _ Mottled soil: Observed at of depth. Not present in hole_ _ _ _ _ _ _ _. Comments: Depth, in feet 0 - 1 - 2 - ®*°''!oii)*Y*8** - 2*2**-MOTTLED 2** 3 - 4 - 5 - 6 - 7 - 8 - Boring number. Surface elevation 992.6 Topsoil dark brown loam 0 - 1*8' Rusty olive brown 212" - 3* Rusty olive gray clay loam 3* - 4*8** Rusty ^.3. . 5. 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 2*2** feet of depth Not present in hole Comments: .-02/ Location or Project Coffin site# Lot 10> Blcok 1» Orono_ _ _ _ _ _ _ _ _ Borings made by s-P Testing. Inc. Steve Schirmers Date 10-24-93 Classifiction System: AASHO_ _ _; USDA-SCS X ; Unified_ _ _; Other_ , FlightAuger used (check two): Hand X , or Power^, or Bucket Depth, in feet 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - Boring number. Surface elevation 992.2 Topsoil dark brovm loam 0 - 1-1/2* Brown clay loam 1-1/2* - 2*10"-HgT|y Rusty olive brown 2'10* - 3•8* Rusty olive brown loam 3*8** - 5* End of Loring at 5*feet. S t nd i'j •./a t r :r; 1 : present at_ _ _ _ _ feet of depth, _ _ _ _ _ _ hours after boring. Depth, in feet 0 - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - °pY8am 2*2** - 2-1/2 *-NgT|]pED Boring number Surface elevation 991.9 Topsoil dark brown loam 0 - 1*2** _ _ Brown clay loam 1*2" - 2*2** Rusty olive brown loam 2-1/2* - 5* End of boring at_ _ _ Standing water table: feet. present at feet of depth. Not prfc^sent in hole _ _ _ _ _ _ _ hours after boring. Not present in hole_ _ _^_ _ _ _ Mottled '• d. 1: Observe- t feet of depth. Not pres-*; • in hole_ _ _ _ _ _ _ _. Comments: Mottled soil: Observed at 2-1 /2* feet of depth Not present in hole_ _ _ _ _ _ ' Comments: V-..1 . i * 1 V ^ ^ Location or Project Coffin site# Lot 10, Block 1, Orono_ _ _ _ _ _ _ _ Borings made by s-P Testing, Inc, Steve Schirmers Date 10*24-93 Classifiction System; AASHO_ _; USDA-SCS_X_; Unified_ _ _; Other Auger used (check two) : llandj(_, or Power_ _ _, Flight , or Bucket Depth,Boring number 5 Depth,Boring number 6inin feet Surface elevation 991.4 feet Surface elevation 990.4 0 - Topsoil dark brown loam u — Topsoil dark brown 0 - 10"loam 1 -Brown clay loam 1 -0 - 1*4" 10" - l*8"-MOTTLED 1*8 *Brovt ^1819^1*4" - 1'8"-IK)TTLED 1*8* 2 -2 -Rusty olive brown clay loan Rusty olive brown 1*8" - 2-1/2* clay loam 3 -1'8* - 3'4*3 -Rusty olive gray clay loam Rusty olive brown 4 -loam 4 -2-1/2* - 4* Rusty olive gray clay loam •> —n’4" - 5*4* - 5*5 - 6 -6 - 7 -7 - 8 -8 - End of boring at feet End of boring at «;'feet Standing '..-ater tarl'.*: present at_f2i^£l of depth, hours after boring. Not present in hole_ _ _ _ _ _ _ Standing water table: present at 24 3*10"feet of depth. hours after boring. Not p_esent in hole Mottled soil: Observed Mottled soil; Observed at 1'8'feet of depth Not present in hole Comments; Not present in hole Comments: nok'.^ CEHi.i00627 PERCOLATION TEST DATA SHEET Percolaiion lest readings made Ky S-P Taatlnq* Inc._____»» 10-25-93 Tesihole incaiinn yBlk. 1 »Cof f In site number _____L 12 6 Depth of hole bonom— inches. Diameter of hole__________inches . Date hole was prepared. 10-24-93 Soil data fror: -fv hole: Depth, 0 - 12- Soil texture Topsoil dark brown loam Method of scratching MA^watl Knifs Depth of gravel in bottom of hole..inches Date and hour of initial \vater filling Dej^h*^ untial water filling__________inches above hole bottom Meihixl used to maintain at least 12 inches of water depth in hole ft>r at least 4 h«Mir^ Aufeoma^lc aiphon .. Maximum water depth aKne hole bottom during tesL .inches •'line 1 Time 1 interval. ' minutes Measurement. inches Drop in water lesel. inches Piercolatir^i rale. minutes per inch Remarks 10:00 prefill 6 10:11 10:26 «3-1/4 4.6 15 min 10:37 10:52 •3-1/16 4.9 m N 10:53 11:08 m 3-1/16 4.9 ■ m 1 i 1 1 i Peradatit’n rale 4.8 .minutes per inch. CERT.*00627 Peicolaiion test leadings made by. ^ u. • - LotlO,Blk.l,Coffin site,Test hole locauon________1 ----------------------------- Hole PERCOLATION TEST DATA SHEET -25-9 J ciMting; (4mm S-P Testing# Inc. nit 10-25-93 ctMftin«ai 10s 00 Date hole was prepared.10-24-93 Depth of hole bottom.Jnches. Diameter of hoi .inches Soil dau from lest hole: Depth, inches 0 - 12- Soil texture Topsoil dark brovm loam Method of scratching sidewalL ICnt f( Depth of gravel in bottom of hole— Dme and hour of initial water niling. .inches 10-24-93 De(Hh*<^ifutial water filling..inches above hole bottom Method used to maintain at least i: inches of water depth in hole for at least 4 hours-----hiifnnatir siphon. .. Maximum water depth above hole bottom during test Jnches i'imc Time interval. minutes Measurement. inches Drop in water level, inches Percolation rate. minutes per inch Remarks lOiOn » nrefill i 6 1 n • 1 2 10s27 If 2.9 15 min lQs5l 1 ! **«»-l /4 2.9 N m 1 n f Rd 11 sOQ 1 "S-1 /fl 2.9 m m 1 i------------------------^ 1 t ♦ :! I Percolation rate jmnutes per inch. PERCOLATION TEST DATA SHEET Percolation test readings made b>*.g-p tar MhSI*- Test hole Waiirtn LptlO »Blk. 1»Coffin site numbcr. Depth of hole bottom—. 12 _____inches. Diameter of hole__§______inches 10-25-?? __10113 Date hole was prepared.10-24-93 Soil data from test hole: Depth, inches Soil texture Tnpartt 1 hmwn loaitl_____ Method of scratching sidgwa H_ Knife Depth of gravel in Kntoin of hole.-inches Date and hour of initial water filling 10-24-93 [)Jp!h*^?n1k!al water lining inches above hole Kmom Method used to maintain at least 12 inches of water depth in hole for at least 4 hfwirx Automatic siphon .. .Maximum w ater depth abo\c lu»lc bottom during tcsL Jnches .*ime Time interval. minutes .Measurement. inches i Drop in w ater [ level, inches 1 Percolation rate. minutes per inch Remarks 10:00 1 preflll 6 ! 10:13 i 10:28 N 4 3.8 15 min 10:35 !10:50 It 3-11/16 4.1 m m 10:55 !11:10 N 3-1/2 1 4.3 m m 1 1 1 1 1 r i ! 1 Percolation rate 4.1 .minute^ per inch. CERT.100627 PERCOLATION TEST DATA SHEET PeicolatioiilitlieadingtiiMdeby S«P T#»ting, Inc .-------on_lO*^S-A3 —suitingai —10: lA Test hole LotlOfBlk* logoff in Slte Hnlg number -----------i------ Date hole was prepared ----10-24«93 .inchesDepth of hole bottom-----------------inches. Diameter of hoi Soil dau from test hole: Depth, inches Soiltextuie 0-12" Topsoil dark brown loam Method of scratching sidewall ----*^nlfe_ Dtne and hour of initial water rillingJ:£rLHz22. WJidAPfMfial water niling—---------inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at lca.st 4 hours—AUtOn^at iC giPhOD. ________ Ma..imum water depth sdwve hole bottom during test-----£.Jnches •'ime Time 1 interval. Measurement. minutes ’ inches 1 Drop in water level, inches Percolation rate. i minutes per i inch 1 Remarks i 10:00 prefill 1 6 10:14 10:29 1 4-11/16 3.2 IS min 10:34 10:49 4-1/2 3.3 ft • 10:56 11:11 1 "4-3/8 3.4 ■ m i 1 1 i i i i ! i 1 I i Percolation rate 3.3 minutes per inch. J CERT.#00627 PERCOLATION TEST DATA SHEET S-P Testing> Inc. ^ «4Mri ® Percolation U; t readings made by— Test hole tnraiv^w LotlOyBlk. lyCoff in site Hole number_____l_. Date hole was pf»pa«»rf 10-24-93 Depth of hole bou. m__12_____inches. Diameter of hole____fi_____inches Soil data from U DejX - . >y. Soil texture 0-10" Topsoil dark brown loam 10" - 12"Brown clay loam Method of scratching sidewall__Knife Depth of gravel in bottom of hole..incho 10-24-93 10:00am 12 Dale and hour of initial water filling__________Depth of initial water filling__________inches above hole Ixntom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours__Automatic siphon____ .. Maximum water depth above hide bottom during tesL .inches fime Time t inters al. Measurement, minutes inches Drop in water level, inches 1 Percolation rate. minutes per 1 inch Remarks 10:00 prefill 6 10:16 10:31 "4-1/16 3.7 15 min 10:32 10:47 "4 3.8 n ■ 10:58 11:13 ' "3-7/8 3.9 N n ! 1 :i !1 i ; i 1 i * i ______J 1 ;( 1 1 ............. 1 :1 Percolation rate = minutes per inch I ' CERT.#00627 PERCOLATION TEST DATA SHEET Ptefcolation test leadings made by----S«P Teatingi InOi— Test hole LotlO .Blk. 1 >Cof f In siteHok number. jS_____inches 10tl 6----- P "»• Soil data from test hole: Depth, inches 0 - 12" Soil texture Topsoil dark brown loam Method of scratching sidewall—Knife, Depth of gravel in bottom of hole------?-------inches D^te and hour of initial water rilling_-12zllli?D^x#ftllffll water filling-----II-------inches above hole bottom Method used to maintain at least 12 inches of water depth in hole for at least 4 hours—etphon _________________________^ _______ ■ Maximum water depth above hole bottom during test-----§----Jnches '»'ime Time interval. minutes Measurement. inches Drop in water level, inches Percolation rate. minutes per inch Remarks 10:00 prefill 6 10:16 10:31 N 4-1/16 3.7 min 10:32 10:47 N 4 3.8 « m 10:S^11:13 n 3-7/8 3.9 m M 1 1 i \ 1 i ;1 !... 1 1 _ .. __................................... Percolation rate »----LtJ-----minutes per inch.