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HomeMy WebLinkAbout1986-01-23 Septic System SpecificationsSPECIFICATIONS FOR PROPOSED ON-SITE SEWAGE DISPOSAL. SYSTEM MOUND: PRESSURE DISTRIBUTION LOCATION: 4385 Chippewa Lane Orono, M'nnesota DATE: January 23, 1986 1. SEPTIC TANK -- Two 1,000 -gallon liquid capacity tanks, in series, manufactured and installed in compliance with the following specifications. See attached figure for location. 1. MATERIALS A. GENERAL All tanks, regardless of material or method of construction, shall be: (1) water -tight. (2) So designed and Constructed as to withstand all lateral earth pressures under saturated soil conditions with the tank empty. (3) So designed and constructed as to withstand a minimum of seven feet of saturated earth cover above the tank top. In addition, the following specifications apply to specific materials as Indicated. B. PRECAST CONCRETE TANKS (1) Precast ,.,,ncreLc _....ks shall be constructed of at least a 4,000 p:. (pounds per square inch) core test, air entrained concrete mix. (2, Precast concrete tanks shall be cured to at least a seven-day strength before installation. C. FIBERGLASS AND PLASTIC TANKS Fiberglass and plastic tanks shall be designed and constructed to meet the requirements in Section I.A. D. METAL TANKS Metal tanks shall have a will thickness of at least eight gauge corrosion - resistant alloys and shall be coated inside and out witn at least one coat of bitumastic seal, Koppers 3DO-M, or by other equivalent means. Tanks shall be carefully installed so as not to puncture or damage the seal coating. -1- E. BLOCK OR SECTIOi1AL TANKS (1) Rectangular Blocks (a) Rectangular blocks shall be laid on an approved bottom. Block shall be at least eight inches thick, constructed of a 4,000 psi core test concrete mix, and cured to a 28 -day strenth before installation. (b) Rectangular blocks shall be laid either with mortar joints or filled cores. (c) There shall be at le. two coats of 1/4 -inch thick concrete plaster placed on the insid. -ie block tank. There shall be at least two hours elapsed time coats. The plaster coat shall start at the bottom course and .,. .. (2) Circular Block Tanks (a) Circular blocks shall be carefully placed on an approved bottom. Circular blocks shall be at least two inches thick and constructed of a 4,000 psi core test concrete mix, cured t a 28 -day strength before installation. (b) There shall be at least two coats of 1/4-1. '. thick concrete plaster placed on the inside of the block tank. There shall be at least two hours elapsed time between coats. The plaster coag. shall start at the bottom coarse and work up. (3) Sectional Tanks (a) A sectional tank shall have an entire section cast as an integral unit. (b) A sectional tank shall have two jr more sections and shall have at least one joint below the level of the outlet invert of the tank. (c) Sectional tanks shall have an integrally cast bottom, or shall.te laid on an approved bottom. (d) The joint or joints shall be permanently sealed so as to be watertight. (4) Bottoms (a) Any tank not having an integrally cast bottom shall not oe installed when the water table is closer than three inches to the bottom of the excavation. (b) If the bottom is poured -in-place concrete, It shall be a• least four inches thick and extend to at least four inches outside the tank wsl'. A concrete mix of at least one part cement, two parts washed sand, and three parts washed rock shall be mixed before placement in the excavation. .2. (c) If a sta, ter ring is used, it shall be constructed of a 4,000 psI core test concrete mix, cured to a seven-day strength before installation. It shall extend at least one Inch beyond the tank wall, Inside and out. A bottom shall be poured of concrete mix defined in Section (b) above. It shall extend at least two Inches above the starter ring and shall be at least four inches thick. (d) If a precast bottom is used, it shall be made of a 4,000 psi core test concrete mix, cured to a seven-day strength before installation. It shall extend at least one inch beyond the tank wall, or be cast integrally with the bottom section. (e) A sectional tank not having an integrally precast botton shall have a four -inch thick bottom poured within the tank walls. (5) Covers (a) Any tank cover not integrally cast with the tank shall be so installed that the joint with the tank sidewall is permanently sealed so as to be watertight. (b) All covers shall be so designed and constructed as to withstand a minimum of seven feet of saturated earth cover above the tank top. F. INLET AND OUTLET DEVICE W(TERIALS (1) Inlet and outlet devices shall be sanitary tees, or baffles constructed of acid -resistant concrete, acid -resistant fiberglass, or plastic. (2) Sanitary tees shall be glued to the inlet or outlet pipes. Baffles shall be integrally cast with the tank, affixed with a permanent waterproof adhesive, or affixed with stainless steel connectors, top and bottom. 2. DESIGN All tanks, regardless of material or method of construction, shall conform to the following design criteria: A. The liquid depth of any septic tank or compartment thereof shall be not less than 30 inches. A liquid depth greater than six and one-half feet shall not be considered in determining tank capacity. B. No tank or compartment thereof shall have an inside horizontal dimension less than 24 inches. C. Inlet and outlet connections of the tank thereof shall oe subnerged by means of vented sanitary tees or baffled. 0. The space in the tank between the liquid surface and the top of the inlet and outlet baffles or sanitary tees shall be not less than 20 percent of the tntal required liquid capacity, except that in horizontal cylind: 4a1 tanks, this Space Shrll be not less than 15 percent of the total required liquid capacity. .3- E. The inlet baffle or sanitary tee shall extend at least six inches but not more than 20 percent of the total liquid depth below the liquid surface and at least one Inch above the crown of the inlet sewer. F. The outlet baffle or sanitary tee and the baffles or sanitary tees between compartments shall extend below the liquid surface a distance equal to 40 percent of the liquid depth except that the penetration of the indicated baffles or sanitary tees for horizontal cylindrical tanks shall be 35 percent of the total liquid depth. They also shall extend above the liquid surface as required in 0. above. In no case shall they extend less than six inches above the liquid surface. G. There shall be at least one Inch between the underside of the top of the tank and the highest point of the inlet and outlet devices. H. The inlet invert shall be not less than three inches above the outlet invert. I. The Inlet and outlet shall be located opposite each other along the axis of maximum dimension. The horizontal distr^ce between the nearest points of the Inlet and outlet devices shall be a.. least four feet. J. Sanitary tees shall be at least four inches in diameter. Inlet baffles shall be no less than six inches or no Wore thin 12 inches meausred from the end of the inlet pipe to the nearest point on the baffle. Outlet baftles shall be six inches measured from beginning of the outlet pipe to the nearest point on the baffle. K. Access to the septic tank shall be as follows: (1) There shall be one or more manholes, at least 20 inches least dimension, and located within six feet of all walls of the tank. The manhole shall extend through the cover to a point within 12 inches but no closer than six inches below finished grade. The manhole cover shall be covered with at least six inches of earth. (2) There shall be inspection pipe of at least four inches diameter or a manhole over both the inlet and o6' -et devices. The inspection pipe shall extend through the cover and be capped flush or above finished grade. A downward projection of the center line of the inspection pipe shall be directly in line with the center line of the inlet or oitlet device. L. Multiple Tanks (1) Where more than one tank Is us•.d to obtair :he required liquid volume, the tanks shall be connected in series. (2) Each tank shall comply with all other r -o sions Of Section I.A. (3) No more than four tanks In series can be us.w to obtain the required liquid volume. .a - MAINTENANCE SUGGESTIONS Inspect the tank annually and have the tank cleaned when the scum is three inches or less above the outlet baffle and/or when the sludge level is eight inches or less below the outlet baffle. 3. LOCATION A. The sewage tank shall be placed so that access is convenient for the removal of liquids and accumulated solids. B. The sewage tank shall be placed on firm and settled soil capable of bearing the weight of the tank and its contents. C. Sewage tanks shall be set back the following distances from the features given below: Feature Minimum Setback Distances (feet) Mater Supply Well and Buried 15 Mater Suction Pipe Bun ed Pipe Distributing i5 Mater Under Pressure Buildings 10 Property Lines 20 The Ordinary High Mater Mark of: - Natural Environment Lakes 150* and Rivers - Recreational Development 15* Lakes and Rivers - General Development Lakes 50* and Streams - Wild River 150* - Scenic River 100* - Designated Tributaries of 15* Mild, Scenic, and Recreational Rivers - Wetlands 15 *Required for new developments and where practicable, for existing developments. -5- IV 4. SURFACE FLOODING Septic tanks shall not be placed in floodplalns delineated by local ordinances adopted in compliance with the Statewide _Standards for Manag.:ment of Floodplain Areas of Minnesota (Minnesota Reyulat Fon NR83-43T, or In areas—Tor which regional flood information is available from the Department of Natural Resources, except that in areas where ten-year flood information is available from and/or approved by the Department of Natural Resources. 11. PUMPING -- A 600 -gallon capacity tank, placed in series with the sewage tank, shall be manufactured and installed in compliance with the following specifications. See attached Figure fur location. 1. PUMPING CHAMBER A. The pumping chamber shall be watertight and constructed of sound and durable materials not subject to excessive corrosion or decay. 8. There shall be one or more manholes, at least 20 inches least dimension and preferably located directly above the dosing device. The manhole shall extend through the dosing chamber cover to final grade and shall be so ,nostru,t n as to prevent unauthorized entry. 2. PUMPS FOR PRESSURE OISTRUBUTION A. A pump shall deliver the dose to the soil treatment area. B. The pump discharge capacity shall be at least 30 gallons per minute, but no more than 45 gallons per minute. C. The pump shall be cast iron or bronze -fitted and with stainl-,ss steel screws or constructed of other sound, durable, and corrosion -resistant materials. D. The quantity of effluent delivered for each pump cycle shall be no more than 25 percent of one day's sewage flow or 200 gallons, whichever Is greater, and shall be no less than 75 gallons. E. The pump discharge head shall be at least five feet greater than the head required to overcome the pipe friction loss and the elevation difference between the pump and the distribution system. F. An alarm device shall be installed to warn of pump failure. For dwellings, there should be reserve storage volume equal to one day's sewage flow based on 75 gallons per bedroom. 111. ORAINFIELD 1. LOCATION A. Mounds shall be located on flat areas or crests of slopes whenever possible. B. Mounds shall not be located on natural slopes of more than three percent if the percolation rate in all layers of natural or fill soil to a depth of at least 24 inches below the sand layer of the mound Is slower than 60 minutes per inch. 6- C. Mounds shall not be located on natural slopes of more than six percent if the percolation rate Is slower than 30 minutes per inch In all layers of natural or fill soil to a depth of at least 24 inches below the sand layer of the mound. D. Mounds shall not be located on natural slopes exceeding 12 percent under any soil percnlation rate conditions. E. Mounds shall not be located on any soil where the percolatino rate In any layer of natural or fill soil to a depth of at least 24 Inches below the sand layer of the mound is slower than 120 minutes per Inch. 2. CONSTRUCTION EQUIPMENT A rubber -tired tractor may be used for plowing or disk4ng to prepare the soil surface but in no case shall a rubber -tired tractor be used after the surface preparation is completed. A crawler or track -type tractor shall be used for mound construction. 3. SOIL SURFACE PREPARATION A. The discahrge pipe from the pumo to the mound area shall be installed prior to soil surface prvpxratiOP The trench excavated to install the discharge pipe shall be careiviiy backfilled and compacted to prevent seepage of effluent. B. The total area selected for the mound, including that under the dikes, shall be roughened in order to thoroughly break up any existing sod layer and to provide a suitable transition zone between the original soil and the sand layer of the Hound. The area shall be roughened only when the moisture content of the soil eight inches below the surface is drier than the plastic limit. Plastic Ilett is the soil moisture content below which the soil may be manipulated for purposes of installing a soil treatment system, and above which manipulation will cause compaction and puddling. If a fragment of soil can easily be rolled into a wire 1/8 -inch in diameter, the moisture content is above the plastic limit. If the soil is dry enough to be f-i'hle W. falls apart when rolling it into a wire, the moisture content I the limit, and the soil may be manipulated. The standard method of determining the plastic limit Is specified in American Association of ',Lace Highway Officials (AASHO) Designation: T 90-61. C. Surface preparation or roughening may be performed with a mold board plow, a disk plow, ur a backhoe using only the teeth. Mold board plow furrows shall be at least 8 inches deep, shall be thrown upslope, and Shall run perpendicular to the slope. There shall be no deadfurrow under the rnund. Disking may be used for surface preparaton as a substitute for mold board plowing in sols having percolation rates faster than 15 minutes per inch (sandy loam) In the top 8 -inch depth.. Disking shall be performed perpendicular to the slope. -7- Backhue teeth may oe used to roughen the soil surface and break up the sod layer. Care m..st be taken so as not to compact or puddle deeper soil layers. In no case snc'I any surface soil be excavated and removed from the area. Backhoe teeth shall roughen the surface perpendicular to the slope. D. Mound construction shall proceed immediately after surface preparation is completed. Every effort shall be taken to prevent rain from falling on the prepared soil surface. 4. SILL (see Figure for layout and details) A. The bottom area of the filter material (rock) was sized on the basis of 0.83 square feet per gallon of waste per day, yielding 500 square feet. B. In no case shall the width of the filter material (rock) in a single bed exceed 10 feet. 5. CONSTRUCTION MATERIALS AND PROCEDURES A. A minimum of 12 inches of soil defined as sand shall be placed where the filter material is to be located. A crawler tractor with a blade or bucket shall be used to move the sand 'rte place. At least six inches of sand shall be kept under the tracks to minimize compaction of the plowed layer. The sand layer upon which the filter mateiral is placed shall be level. B. Sand is defined as a soil texture composed by weight of at least 25 percent of very coarse, coarse, and medium sand varying in size from 2.0 to 0.25 mm, less than 50 percent of fine or very fine sand ranging in size between 0.25 and 0.05 mm, and no more than 10 percent of particles smaller than 0.05 mm. C. A depth of at least 9 inches of filter material (rock) shall be placed on the sand layer prior to installing the distribution D. Filter material is defined as clean rock, crushed igneous rock, or similar insolubTe, durable, and decay -resistant material free from dust, sand, silt, or clay. The size shall range from 3./4 -inch diameter to 2 1/2 -inch diameter. E. Effluent shall be distributed over the filter material by 1 -inch to 1 1/2 -inch diameter perforated pipe under pressure. Perforation holes shall be 3/16 -inch to 1/4 -inch in diameter drilled in a straight line along the length of the pipe. Hole pacing shall be 30 inches to 36 inches. Holes shall be drilled straight into the pipe and not at an angle. A sharp drill shall be used and any burrs in the inside of the pipe shall be removed. The perforated pipe laterals sha.l be installed level with the perforations downward. F. The perforated pipe laterals shall be connected to a 2 -inch diameter manifold pipe and shall have their ends capped. The laterals shall be spaced no further than 40 'inches on center and no further than 20 inches from the edge of the filter material. Laterals shall be no longer than �O feet. G. The manifold pipe shall be connected t0 the supply pipe from the pump. The manifold pipe shall be sloped toward the supply pipe from the pump. -8- H. At least two inches of filter material shall be placed over the lateral pipes. 1. Straw or marsh hay to an uncompacted depth of three to four inches or untreated building paper shall be placed over the filter material. J. Construction vehicles shall not be allowed on the filter material until backfill is placed. K. Sandy loam soil shall be placed on the filter material to a depth of one foot in the center of the mound and to a depth of six inches at the sides. L. Six inches of topsoil shall be placed on the fill material over the entire area of the mound. A grass cover shall be established over the entire area of the mound. N. No shrubs shall be planted on the top of the mound. Shrubs may be placed at the foot and side slopes of the around. N. Side slopes of four feet horizontal to one foot vertical (a:l) are suggested for the dikes of the mound. This gentle slope will allow easy mowing of the grass cover. If area Is limited, steeper side slopes of 3:1 can be used. But In no case shall the dike slope be ctoeper then 3:1. The soil material at the toe of the dike should be sligutJy less v�rmeable or somewhat tighter than the natural soil below the mound. This can be accomplished by selecting a finer soil or by compaction. 0. Whenever mounds are located on slopes, a diversion shall be constructed immediately up slope from the mound to intercept and divert runoff. P. A four -inch in tion well shall be provided for, if required by the regulating au ity, and should be placed in the center of the field and capped flush with the ground. Feature Water supply well less than 50 feet deep and not encountering at least ten feet of impervious material Any other water supply well or buried water suction pipe Buried pipe distributing water under pressure Building Property lines .9- Setback Distance in Feet 100 7, 20 20 20 Feature The Ordinary High Water Mark of: - Natural Environment Lakes and Rivers - Recreational Development Lakes - General Development Lakes and Streams Setback_ Distance _ In Feet 150* 75• 50• - Wild River 150• - Scenic River 100. - Recreational River 75e - Designated Tributaries of 75• Wild, Scenic, and Recreational Rivers - Wetiands 75 •Required for new developments and where practicable, for existing developments. 10- TABLE 1 PERCOLATION RATES Hole ?1o._I Rate (Minutes/Inch) P1 30 P2 60 TABLE 2 SOIL BORING LOGS Soil Boring No. I - 4-irdh )ower auger and hand -powered bucket auger 0' - 1' Silt Loam at 1' 1' P - 2' Clay loam 2' - 3' 2' - 3' Net heavy clay (greasy) Drier clay, less greasy, 3' - 4' Mottled •.lay with shallow (<I") gravel lens 4' - 5' Light tan colored clay with mottling 5' - 6' Light tan colored clay with mottling (hard drilling), heavy mottling at 5;' (4"-5" standing water found neat morning) Soil,Borinq No. 2 -- 1" hand auger 0' - 1' Silt loam 1' - 2' Clay 2' - 3' Heavy wet clay, greasy, some mottling 3' - 4' Dryer clay, light tan color, mottled, shallow gravel lens 4' - S. Mottled clay, dark tan color, hard drilling 5' - 6' Heavily mottled clay Soil Boring Yo• 3 -- 1" hand auger 0' - 1' Silt loam with silt clay at 1' 1' - 2' Wet greasy clay, mottled at 2' 2' - 3' Wet greasy clay, mottled 3' - 4' Drier clay, less greasy, mottled 4' - 5' Drier clay, gravel lens (<1") at 4.5', mottled 5' - 6' Light colored, drier clay, less mottled //o TF: BM- TeP STEP STiM.(S To A%45EMfN7 - /4VO.0 tibTE: �oCATio�J o- E.VST SE,oric 7 -,*)k 4W Ab1✓AI t \ � J FbiK.:ry �Dn rc tb a CN/PPElVA LANE 4aAye Va�.n� C.Srwbt/ i se, be Aw// P � w� • a sic Tisk \ 1 1 I I & � E•isi. D.i>< /!.r TreoTAr�nf � leca? p sb' Nt r, Vm(r),0) ')f /o�P/r Twee /✓oTE: rwo EP c -I- TANKS /N 5 ,iE QU/.fEv Woods yore: f'//p,P/e. To / YE.er �/OC ffecAfs USCD To L'+LC. //)oc/oID L/MiT.i. I Mv�K Fi rt/ems _ .ono M s• F A. WKOK & ASSOCIATES ✓ / /V HtfktOLOf'dSTS•ENC:It:t'tR5 A MUM APOI IS - MINAE $OTA rAAe,$ TO 445 EMENT - /"0. O nhTE: .00A!/o.V of EN5T SEPT/C uvr.�bw�/ Ll N SCALE.• / � So • � C1//OPEWA 4AmC /k�rkary 4olsgs � Oo�++� C.Ssw�e/ .fres � T k.r,lk Q F/ • dls y"e/� � • pi I I i CfyP•) iL lI / Bush --�• . . 58= Mo✓ted ,► / l T Trea msn� •` rT / l /4/E0. ,Eed .Are / / r • • • • • Sa3 � ' i J i i �I � App/e Or�ors/ • e e • e fs< SITE f3�le —.-- YA • e • Z • Tnie.(Tri.) 'A' FP0/kTree "ism-.-��..i� _f_.� f � .. �`-�.•'ti� NoTE� T'wo SEPT/C .� TA -./,CS /N Woods More; f "//O,Pie. sroC lccf'CS ✓seD ro CM r, //!9(/NO L/MiTA QV 0.47 _ E.A. MKOK & ASSOCIATES PLAN HYDROLOGISIS EWG" CRS M"4E APOI_IS • MiNNt SOTA FROM SEPTIC l TANK PUMPABLE CAPACITY AT LEAST 75 GALLONS PIGGY BACK PLUG iN WEATHER PROOF ENCLOSURE -OR LOCATE IN HOUSE BASEMENT POWER SUPPLY 't PUMP 24" MANHOLE - PLASTIC ROPE OR CHAIN - WITH ANCHOR _ ALARM FLOAT ON SEPARATE ELECTRICAL CIRCUIT RESERVE CAPACITY AFTER ALARM SOUNDS START LEVEL_ _ _SHUT _OFF LEVEL -s?- 12.. 18" MINIMUM 4-12"IB"MINIMUM DEPTH ALARM WIRE MANHOLE COVER SECURED TO PREVENT UNAUTHORIZED ,ENTRY UNION OR OTHER QUICK DISCONNECT FITTING PIPE IS LAID ON A UNIFORM SLOPE FROM PUMP STATION UP TO SOIL TREATMENT AREA FOR PROPER DRAINBACK r -;a 3 Iwr.. BY. Ma. �» »E•MP rp(A ETl( MY 4;'FI V%1rl I�O/9P[P wwu - -L__._ -. conrKDL WmE_._ 1%P'RwroFDwlx wMl I•M i.4V IIWI yN YNWrI I fIC0PI[4 (KKWf RI (~I, M TE» 4MM SRYNq T� R ww-ar y[vEL p. �H! T MiNiY.Y mol. iiwt�� S�uaHl� 4aNM »iM GALLONS PER FOOT OF DEPTH K.ME CMtP YCIVRO FROSTPROOFING THE Io FWH:NI WMNr10PM DISCHARGE PIPE FIN, 370 30 550 PLACE A ROCK ENVELOPE 940 50 AROUND DISCHARGE PIPE 60 2110 ROCK SHOULD BE V. TO 2 11, 75 _y�jp1(1NtnQ1IX1pDTNNyET�T INCHES IN DIAMETER, WITH ISO ISO 125115 NO SAND COVER WITH A 2 16 TO 30 250 rTTW4-T INCH THICK SHEET OF 165 150 SI TO 45 EXPANDED POLYSTYRENE 300 2A0 f WHEREVER POSSIBLE MAIN- 46 TO 60 �1oP&M{NI ME1 TAIN A GRASS COVER OVER 265 220 TOP OF TRENCH AND ALLOW SLOW WI (PARA TVM SNOW TO REMAIN IN PLACE DLYNINK., UX - MC. NPE Mb WHEN SNO'N COVER 15 LIGHT, HANE60A nl RAuufO V 10 M keel., PLACr A 6 INCH NAY OR .5 'P ' STRAW LAYER ON GROUND ABOVE PIPE PUMPING RATE SHOULD NOT EXCEED DROP BOR OUTFLOW CAPACITY OR AS GALLONS PER MINUTE (2100 GALLONS PER HOUR) PUMP DISCHARGE HEAP MUST BE ADEQUATE TO OVERCOME ELEVATION DIFFERENCE BETWEEN THE PUMP AND DISTRIBUTION BOX PLUS FRICTION LOSS IN DISCHARGE PIPE LIQUID CAPACITIES OF VERTICAL CIRCULAR TANKS IMIDE DIAMETER OF TANK IN FEET GALLONS PER FOOT OF DEPTH I S IS0 20 233 25 370 30 550 AO 940 50 I4]0 60 2110 TOP EXAMPLE. A CIRCULAR TANK W11H AN INSIDE DIAMETER OF A FEET HAS 94 GALLONS OF LIQUID CAPACITY PER FOOT OF ULPTH TD ('UMP 200 GALLUNS PER (TILE. THE PUMP CONTROL SWITCHES WOULD NEED FU BE SET 21 I.-'I,.I FEET APA..T &ACKFppIELELLp POLTS�TYRENF. DISCHARGE W FIFE -- r ROCK n/••- 2'/i DIA - TO DETERMINE THE LIOUID CAPACITY OF ANY TARN, FIRS - DETERMINE THE SURFACE ARr;c OF THE LIQUID MULTIPLY THIS VALUE BY :: (GALLONS PER CUBIC FOOT) TO DETER- MINE THE TANK LIQUID CAPACITY IN GALLONS PER FOOT OF DEP•H BS DROP BOM Y soK r'E•__ _ M' S'/' D�. WC. POM PU� L DRAIN Ty` OR R" r y PERFORATED PLASTIC PIPE 3'MIN FROM BOTTOM OF TRENCH TO -�-i WArEk ATER TABLE OR CLAY OR ROCK SOIL TREATMENT AREAS FDR TYPE I HOMCS6 REQUIRED SOIL TREATMENT AREA IN SQUARE FEET PER BEDROOM pTEWLFR��ION TRENCHES INCH RR gEp BQS� 0R84 UTpc IEX BELM_WKS i 1 12 I 18 1 24 FASTER THAN OI P — — 0.1 TO SIRS 125 100 BS 75 6 TO IS 190 ' ISO ISO 125115 16 TO 30 250 250 200 165 150 SI TO 45 300 300 2A0 200 1B0 46 TO 60 330 330 265 220 200 SLOW HANE60A Y--. "r .ISO w HP AT . •S'HO-1 DESi4N Sq 00 WE OSEA M FKFMSE M PWI IRE.TMENI " XXHX,H.,N X, [E(µENS RECOMM'NOEO AMOUNT OF EFFLUENT TO NMP PER CYCLE IS 25 PERCENT OF ONLY SEWAGE FLOW. MINIMUM AMOUWT OF EFFLUENT TO PUMP PER CYCLE 15 75 GALLONS PV MHK swM WIRE DISPLACEMENT. WEIGHT - AOJ REW PUMP CONTROLS MOISTURE -PROOF HOUSING SWITCH PLUGS INTO POWER SUPPLY � PUMP 1 I 1 ADJUSTABLE WEIGHT MAGNETIC CONTACTOR MERCURY FLOAT PUMP PLUGS TO RELAY IN �- INTO SWITCH iWEATHER-PROOFr ENCLOSURE l OUTSIDE OF PUMP TANK I POWER CORD POWER CORD TO i0 PUMP PUMP COMES FROM RELAY i I E`E CTRODES E MERCURY !SWITCH BOATS NOTE LIQUID LEVEL AT LOCATION OF STOP CONTROL MUST BE ABOVE PUMP CASE ELECTRODE HANGER QSTARTBEVEL RELAY 'c -'j 4 COMPARTMENTED SEPTIC TANK AT LEAST 1/2 �- BUT NOT MORE _ THAN 2/3 OF DEPTH, D TOTAL CAPACITY wrEs: 1. SEPTIC TANKS LARGER THAN 1000 GALLONS AND FABRICATED AS A SINGLE UNIT SHALL BE DIVIDED INTO TWO OP MORE COMPARTMENTS. 2. WHEN A SEPTIC TANK IS DIVIDED INTO TWO COMPARTMENTS, NOT LESS 71LO ONE-HALF NOR MORE THAN TWO-THIRDS OF THE TOTAL VOLUME SHALL BE IN THE FIRST COMPARTMENT. ' 7. WHEN A SEPTIC TANK IS DIVIDED INTO THREE OR MORE COMPARTMENTS, ONE-HALF OF THE TOTAL VOLUME SHALL BE IN THE FIRST COMPARTMENT AND THE OTHER HALF EOUALLY DIVIDED IN THE OTHER COMPARTMENTS. CONNECTIONS BETWEEN COMPARTMENTS SHALL BE BAFFLED TO AS TO EFFECTIVELY RETAIN SCUM AND SLUDGE. ADF�UATE VENTI`" SHALL BE PROVIDED BETWEEN COMPARTMENTS BY BAFFLES OR BY AN OPENING OF AT LEAST 50 SQUARE INCHES NEAR THE TOP OF THE COMPARTMENT WALL. ADEQUATE ACCESS TO EACH COMPARTMENT SHALL BE PROVIDED BY ONE OR MORE MANHOLES, AT LEAST 2U INCHES LEAST DIMENSION, AND LOCATED WITHIN SIX FEET OF ALL WALLS OF 711E TANK. THE MANHOLE SHALL EXTEND THROUGH THE COVER lU A P:MNT WITHIN 12 INCHES BUT NO CLOSER THAN SIX INCHES BELOW FINISHED CRAOL. THE MANHOLE COVER SHALL BE COVERED WITH AT LEAST 6 INCHES OF EAVTH. 6. WHEN MULTIPLE TANKS ARE USED TO OBTAIN THE REQUIRED LIQUID VOLUME, THE TANKS SHALL BE CONNECTED IN SERIES. NO MORE THAN FOUR TANKS IN SERIES CAN BE USED TO OBTAIN THE REQUIRED LIQUID VOLUME. THE FIRST TANK SHALL. BE NO SMALLER THAN ANY SUB9EQUF.NT TANKS IN THE SERIES. I" MIN. HORIZONTAL, CYLINDRICAL SEPTIC TANK DIMENSIONS DIA 1 a FT MINIMUM INSIDE LIAMETER I A D 10.79 DIAMETER 9 L 12 T03 TIMES THE DIAMETER C MANHOLE 20" DIA. MIN. 0.15 D 6 IN MINIMUM 0.2 D MAXIMUM 0.35 D TO NEAREST INCH a" DIA. I" MIN. MIN. 1T A LIOUID LEVEL SCUM B I A � 3" MIN, Li 6" 0 L SLUDGE l DIMENSIONS DIA 1 a FT MINIMUM INSIDE LIAMETER I A D 10.79 DIAMETER 9 L 12 T03 TIMES THE DIAMETER C MANHOLE 20" DIA. MIN. 0.15 D 6 IN MINIMUM 0.2 D MAXIMUM 0.35 D TO NEAREST INCH VERTICAL SIDEWALL SEPTIC TANK FINISHED GRADE r LEAST �-� T--� -SAT LEA! 4" DIA. S' TO 12 SOIL COVER 4" D14 AT LEAST 1" AT LEAST I" -AT LEAST 3" DIMENSIONS FOR TANKS WITH VERTICAL SIDES WIDTH W 24" MINIMUM LENGTH L 2 TO 3 TIMES THE WIDTH DIAMETER 60" MINIMUM DEPTH. D 130" MINIMUM, 78" MAXIMUM A 0.2 D 13 6" MINIMUM; 0 2 D MAXIMUM C 10.4 D AT LEAST 4 FEET NOTES: 1. SAVITARY TEES AT LEAST 4 INCHES IN DIAMETER MAY BE USED IN PLACE: OF BAFFLES. 2. THERE SKALI, BE ONE OR MORE MANHOLES. 20" LEAST '-IME:NSION AND LOCATED WITHIN 6 FEET OF AL1. TANK WALLS. J. AN INSI-EC'1'I0H PIPE OF AT LEAST 4 INCITES DIAMETER OR A MANHOLE SHALL BE LOCATED OVER BO'TII'lll. INLET AND OUTI.EIDEVICES. THE CENTER LINE (IF THE: INSPECTION PIPES SHALT. BE THF. SAME AS THE CENTER LINE OF THE RAFFIT OPENINGS OR SANITARY TEES. 4. MANHOLE COVERS SHALL BE LOCATED WITHIN 12 INC4ES BUT NO CLOSER THAN 6 INCHES BELOW iINISHED GRADE AND COVERED WITH AT LEAST 6 INCHES OF EARTH. 5. SEPARATION DISTANCE BETWEEN END OF INLET PIPE A'!I NEAREST POINT ON BAFFLE SMALL BE NO LES THAN 6 INCHES OR NO MORE TRAM 12 INCITES. I. FOR HORIZONTAL CYLINDRICAL TANKS DIMENSION A IS 0 ISD AND DIMENSION C IS 0.35D. 101:;' . 7 SPECIAL SEPTIC TANK OUTLETS 2 In.- AIR n: AIR VENT"_I I I I I2 in. 1 1; 1 B. OUTSIDE TANK GAS BAFFLE inl 811 2in.----�i R21n. 64` C GAS BAFFLELECTOR OUTLET SCUM BAFFLE 121n. 1.21n. 16in. in. TANK OUTLET PIPE A. GAS TANK �, GAS AFFLE � 4in DEFLECTION 30°:. BAFFLE CLEAN OUT -- INSULATED '�, _VENT LOCATE THE SEPTIC TANK NEAR THE MAIN SOURCE OF SEWAGE 6" TO 12" OF EARTH COVER TO SOIL [N0 CLOSER i TREATMENT THAN 10' l UNIT F�. 9 INSULATED USE A PUMP TO LIFT 4VENT LAUNDRY AND FLOOR DRAIN PIPE WASTES TO A SEPTIC TANK LOCATED ABOVE THE BASEMENT FLOOR LEVEL !2° SUBMERSIBLE SUMP PUMP TO SOIL TREATMENT UNIT lri INLETSi�3 SCUM rt -,OUTLET LEVEL ' M t =SCUM CLEAR = 4I MARKS OUTLET CLEAN OUT TANK W4EN A IS 3' OR LESS OR ' R "B" 15 12' OR LESS Di BLACK COLOR SLUDGE j Ilor DIS"INGUISHES SLUDGE LAVER FROM LIQUID MEASURE SCUM AND SLUDGE ACCUMULATIONS IN THE SEPTIC TANK SANDY LOAM MARSH HAYSCOVERED WITH RED ROSIN PAPER I'/" OR 2" \ PIPEFROM PUMP CLEAN2'f�OCK ' V TOPSOIL -W LEA SAND FILL J If 9., BR REN YER Up PERFORATED LATERALS ' DIVERSION FOR SURFACE WATER Mq BQNR�,��RA LAYER Ft. iZ -PIPE FROM PUMPING CHAMBER x ',''I,// O / PERFORATED I � II I BED AREA W 2 .: I CM i •�11NCRE - e -DIKE --�- �O, FEET, -DIKE - TOTAL WIDTH PLAN VIEW 13 CLEAN ROCK PERFORATED LATERAL (TYR? 3/4" TO 2 V2" 12SANDY LOAN SOIL S" TOPSOIL SVSRASS COVER S^ 1 EXIST. IMPOUND PROIFILE TY . 12" 'LEAN SAND PRL LAVER SROREN W m IWW ASM STRAIN, YSN NAY COVERED WI. 1 REO ROSIN PAPER OR DISREOI NOT TO SCALE EA. HICKOK A ASSOCIATES NYOROLOGtS� E71QI�E� 14 CROSS-SECTION A -A 14 MNEAPOLIS-MIlESCYTA VIEW LAYOUT OF PERFORATED PIPE LATERALS FOR PRESSURE Dl,,TRIBUTION IN MOUND PERFORATED PLASTIC PIPE 30" OR 36" ION _c UBi PERFORATIONS ON BOTTOM OF PLASTIC PIPE P£RFORArION SPA�IN� MANIFOLD PIPE END CAP �AreRA� EO PERFORAr N6'N OF FROM CHAMBER F1. /S TEE TO TEE LATERAL -MANIFOLD CONSTRUCTION Grass Cover Topsoi I < < Loamy Sand Backfill !- Hay or Straw .vere:i —=—` ---- -- _—� -—_ --_ by Layer of Red Rosin - = Paper (or nylon fabric) Late oT Perforation in Cap Near <` Tee ``. �t Crown of Pipe Reducer Perforations at Lateral t� Ma�niiiffoolld Invert ,Tee , Rock Layer 12 -Inch Layer of Clean Sand MANIFOLD LOCATED AT END OF PRESSURE DISTRIBUTION SYSTEM �E�rrr MANIFOLD PIPE of PERFoorfo I pof fg L ALTE 4NATE � LOCATION OF PIPE FROM PUMP .1r;I. /a REQUIRED PUMPING RATES AND MAXIMUM PERFORATED LATERAL LENGTHS FOR VARIOUS PERFORATION SIZES AND PIPE DIAMETERS PERFORATION SPACING 30 INCHES PERF - DIA GPM/ PIPE DIAMETER SOOT PERFORATION SPACING 36 INCHES GPfV/ 100 PIPE DIAMETER SO FT I" 5.0 34' 52' 70' 4.5 36' 60' 75' 7/32.. 7.0 30' 45' 57' 6.0 33' 51' 63' 1/4' I 9.0 25' 38' 50' 7.5 27' 42' 54'