ATT10 C1-16 SEPTIC DRAINFIELD and SEPTIC TANK-REV01.pdf

NOTE 1250 GALLON SEPTIC TANK SIZE DRAWN AS 6' WIDE X 8' LONG X

5'-7" HIGH WITH INLET INVERT BEING 55" FROM OUTSIDE BOTTOM OF

TANK. OUTLET INVERT 2" BELOW INLET INVERT. TANK DIMENSIONS

MAY VARY - FIELD ADJUST, BUT KEEP PIPE SLOPES AT 2%.

10' OF 4" SCH 40

PVC AT 2% SLOPE

ALL DRAIN FIELD

PIPE LAID LEVEL

WITH INVERTS AT

95.23'

40.0'

1.5' 1.5'

40' X 18', 6A DRAIN

ROCK TOP FOOTPRINT

6 EACH 37' LONG 4" PVC-DS 2 HOLE PERFORATION LATERAL

PIPES LAID LEVEL WITH 5/8" DIA PERFORATIONS AT 5" O.C.

LAID AT 4 & 8 O'CLOCK POSITION WITH PIPE LETTERING AT 12

O'CLOCK. ALL JOINTS TO BE GLUED.

4" PVC-DS PIPE

NON-PERFORATED HEADER

4" PVC-DS PIPE

NON-PERFORATED FOOTER

1 OF 4 OBSERVATION

PORTS - SEE DETAIL

ELBOWS AND TEES AS REQUIRED.

ALL JOINTS ARE TO BE GLUED.

PLAN VIEW OF DRAIN FIELD AND SEPTIC TANK - SCALE 5/16" = 1'

A

A

EFFLUENT FILTER

OUTLET INVERT

95.43' TO FIELD

4" SCH 40 PVC

AT 2% SLOPE

FROM BLDG

6"

INLET INVERT

95.60' FROM BLDG.

30" Ø RISER AND LID.

EXTEND RISER SO LID IS

4" ABOVE FINISHED

GRADE & INCLUDE

CONCRETE TANK LID -

SEE SPECIFICATIONS

· DESIGN FLOW BASED ON:

MEETINGS 41 PEOPLE X 5 GAL/PERSON = 205 GPD

SHOWERS 8 PEOPLE X 15 GAL/PERSON/SHOWER = 120 GPD

10 PERSONS FOR A FULL 8 HOUR SHIFT X 18 GPD = 180 GPD

1 CLOTHES WASHER CYCLE PER DAY X 20 GAL/CYCLE = 20 GPD

· DESIGN FLOW DETERMINED TO BE 525 GPD BASED ON CURRENT

EXPECTED USE. THIS WAS INCREASED BY ~40% DUE TO

POSSIBLE FUTURE INCREASE IN USE THAT IS NOT FORESEEN.

THEREFORE THE DESIGN FLOW OF THIS SYSTEM IS 720 GPD.

· ALLOWABLE LOADING RATE IS 1.0 GPD/SFT BASED ON COARSE TO

MEDIUM SAND BELOW THE DRAIN STONE & IS ALLOWABLE FOR A

BED DESIGN THAT IS LESS THAN 1000 GPD PER MI CRITERIA FOR

SUBSURFACE SEWAGE DISPOSAL

· DESIGN OF COMPONENTS PER THE MI DISTRICT HEALTH

DEPARTMENT #10 SANITARY CODE..

B B

CENTER

EFFLUENT FILTER

IN RISER - SEE

SPECIFICATIONS

LIQUID LEVEL (LL)

EXTEND INLET BAFFLE 12" BELOW LL

& 8" ABOVE LL USING SANITARY

SWEEP T AND 4" SCH 40 PVC PIPE -

GLUE ALL JOINTS. CENTER OF

BAFFLE SHALL BE 6" FROM EDGE OF

TANK OPENING.

1250 GAL SEPTIC TANK SECTION B-B - SCALE 3/8" = 1'

INLET INVERT = 95.60'

OUTLET FOR EFFLUENT FILTER

2" (0.17') BELOW INLET INVERT

OUTLET INVERT = 95.43'

TANK BEDDING SHALL CONSIST OF NATURAL INSITU SAND - NO

BEDDING STONE REQUIRED.

WATER TABLE OBSERVED AT APPROXIMATELY 90.7' +/-

FINISHED GRADE = 97.50'

EXISTING GRADE = 97.5'+/-

30" Ø RISER AND LID.

EXTEND RISER SO

TOP OF LID IS 4"

ABOVE FINISHED

GRADE & INCLUDE

CONCRETE TANK LID

- SEE

SPECIFICATIONS

CROSS SECTION A-A OF DRAIN FIELD - SCALE 3/8" = 1'

20'

18'

EXISTING GRADE ~97.4'

BOTTOM OF 6A STONE = 94.73'

INVERT OF ALL PIPE = 95.23'

TOP OF 6A STONE = 95.73'

FINISHED GRADE 97.5'

TOP OF BACKFILL/BOTTOM

OF TOPSOIL = 97.0'

GEOTEXTILE FABRIC

OVER TOP AND ALL

SIDES OF STONE

1.5' 3' 3' 3' 3' 1.5'

SALVAGED TOPSOIL

BACKFILL - CLEAN

EXCAVATED SOIL

4" PVC

PERFORATED

LATERALS

3'

8'

DRAWN

DESIGNER

STAMPS, LOGOS, AND SEALS

PROJECT NAME

DRAWING TITLE

CHECKED

ARCHIVE NO.

DATE

PROJECT NO.

DRAWING SHEET NO.

DATENO.

REVISION / ISSUE

OFSHEET

United States Department of Agriculture Forest Service

/10

/22

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EASTERN REGION

CADILLAC -

MANISTEE FIRE

OPERATIONS

CENTER

HURON-MANISTEE

NATIONAL FOREST

CADILLAC-MANISTEE RANGER

DISTRICT

SEPTIC DRAIN FIELD

AND SEPTIC TANK

8-3-2022 090403-ABL2022-0002-C0001

R.SUTTON

R.SUTTON

D.MATTEI

C1-16 6 6760

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