HomeMy WebLinkAboutSeptic System Design ReportA
DESnN IjATA; (Kt>r o tJ*.ore* l«jnlviduol Sewsc® Trestncnl nyste.n)
Sewaae Flow Rate based on^JJ Rules Port 70-^0 Table IZT^e X House ^^edroor.s ..iM^ OPD ( Gallons per day)
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B. aeptlc Tank Capeity. I
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•• ,C., Soil Characteristics
1) Depth to high seasonal zone of saUratIon level
Mottled soil level)VS^‘ SV Inches
2) five. Percolation.-. Rate miVinch
((design range^.5^oain/inch
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........ sq.ft./gpd3)Soll sizing factor o2
U) Landslope i
D.. Treatment Area ( Dralnfleld) Required
1) Soil sizing factor X daily floW raU. ft
^ i:aq.ft./gpd X gpd. ■
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/c/% - /0<9c:> -^5 (minimum soil treatment area)
2) Maxlmun Trench Depth 9 *" / */
3) Trench Width: r>L
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sq. ft trench bottom area ^ c2> ^ trench width
* ^\JTj Lineal ft. of trench needed
5) Number of trenches need*
6) Trench Spacing
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7)Di8trlbution type
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Q) Rock Depth
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50 aocK V,l.»e „5-0;Sg_ cubic y«..
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TRENCH CONSTRUCTION DETAILS
TRENCH ROCK COVER
FIFE TO NEXT
•IHCCT i OROF 80XrlNtd I" OHO»' ow*
\^l earth*backfSCl
A, AOovE TOF or
A
o ROCK
r 4* diameter \ iNSFcaioM\ ig&'-T
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^ROF BOX
4’.lWI:n;iniT«7nBJTJ:
oefth or clean rock
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TNCNCH LCnCTH •, fCCTloo 4
DROP BOX v
r ®'^%r‘^ettlinc
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outlets
to trench
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BACKflLL
EHcattr
ROCK
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FIFE
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outlet TO
TRENCH
inlet from SEFTlC tank
or previousOROF BOX
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^7 v^—rsupply line //Vf^^SW TO NEXT
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notes* - BOTTOM OF TRENCH MUST BE LEVEL. TOR Of TRENq4iROCK MUST BE LEVEL.
• DISTRIBUTION FIFE SMALL BE INSTALLED LEVEL* TO|
slightly ALOFiNCi. • (4* iH ioO« |M».) v
• SCARIFY TRENCH BOTTOM AND SIDEWALLS .AS NICH
AS ROCK WILL BE PLACED IN*THE TRENCH .4 *.
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TRENCH®
• SUCCESTEO TRENCH UOUIO LEVEL IS AT
lTNTScr?«ISK"^W WOJiW 10.
or outlet fife if hay or stran
COVERS ROCK.. .........
FIFE TO NEXT OROF BOX.
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iWSTRUCTION SPECIFICATIONS
I. All construeunless otherwise noted. Is to be performed in strict
accordance with the provisions of MN Rules, Part 7080, Individual Sewage
Treatment Systems Sc.indards. Any deviation from this design shall be
approved in writing by the owner or his representative.
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2. The dralnfield treatment area will be staked out by the owner or his
representative before construction. Construction vehicle traffic within
this area shall be limited to backhoe and/or small tracked vehicles before,
during, and after construction.
3. Trench construction shall not occur if soil moisture has reached or
surpassed plastic limit.I;
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A. Trench bottoms anM rock shall be installed level and parallel to surface
contours as nearly as possible.
S. Only clean. Insoluble rock 3/A" to 2 1/2" mean diameter shall be installed
in trenches.
6. Sewer pipe shall be A" diameter, schedule*A0 PVC or of greater strength.
7. Distribution pipe shall be A" diameter PVC with a minimum 1,000 lbs.
crushing strength and one row of 1/2" diameter holes spaced no greater than
36" apart and installed at the 6 o'clock position. Pipes shall be
inacalled level with a slope variance of no more than 2" in 50* down and
away from drop boxes.
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Drop box inlets and outlets shall be as noted in the drawings.
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Drop boxes shall be installed on firm, natural soil as will sewer pips
connecting drop boxes.
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10. Trench*rock shall be covered with A" of straw and untreated building paper
or a thin, permeable, synthetic fabric from trench wall to trench wall
leaving no rock uncovered.
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11. Capped inspection pipes shall be installed at the end of each trench as
noted in the drawings. Pipes shall extend A" above final grads.
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12. The septic tank shall be a vertical sidewaU, watertight,
corrosion-resistant, one-piece, precast concrete tank with gasketed lid.
The lid shall have a minimum 20" diameter manhole bu^ie^* between 6" and 12'*
deep and A" dapped inspection pipes extending A" above grade, cantered over
the inlet and outlet baffles as notau in the drawings, j
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13. Septic tank baffles shall be made of acid resistant plastic or fibsrglassAvy
and attached with at least four corrosion-resistant connections pep baffle•
A" sanitary tees may be used in place of baffles.
14. Pinal grading upslope of the drainfield area shall provide for diversion of .
runoff away from the drainfield, as shall grading around the septic tank.' 'away from the drainfield, as shall grading around the septic
15. Turf establishment shall be the responsibility of the owner.
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