HomeMy WebLinkAboutSystem Plan4" EFFLUENT LIN
FROM SEPTIC TANK
/DISTRIBUTION BOX LID
AT GROUND SURFACE
RISER SEC TION
INVERT IN
"' SOLID PVC GRAVITY
DISTRIBUTION PIPES (TYP.)
TO ABSORPTION LATERALS
DISTRIBUTION BOX DETAIL (SKEMATIC)
N.T.S.
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SUACEYARD LANSCAPED
�i�\/, //., OR AGGREATE PAVED SURFACE
6" MIN. rrrAr
EXCAVATED MATERIAL COMPACTED
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TO 90% STANDARD PROCTOR
AtA
\ EXISTING
CLEANOUT
EXISTING 2-COMPAINT 1500 -GALLON CON TE SEPTIC 0
TANK WITH RECENTLY INSTALLED (2) 24" DIA. RV 1.5' AND 0.1i.a
DEEP CONCRETE RISERS WITH UDS AT THE
"-INSTALLED EFFLUENT FILTER IN OUTLET SAl
TOP OF TANK EL.=6525.41
TANK INV,OUT EL.=6524.4
TANK ININ EL.=6524.7
IW
o
SROADLBASBACKFILL OR CLASS 6
TRENCH CROSS-SECTION FOR
I SDR -,26 HDPE OR SCHED-40 PIPES
N.T.S.
x
/ APPROXIMATE:. LOCATION OF FAILED
CHAMBER BITP ABSORPTION FIELD
INSTALLED BELOW 4=6 FEET LAWN FILL
TO/ BE DISCONNECTED AND ABONDONED INPLACE
BUI'"ING EIV
NOTES:
1. ENGINEER TO CONFIRM CONDITONS IN THE LOCATION OF THE
TREATMENT ABSORPTION FIELD. THE ENGINEER WILL PROVIDE
ADMONAL RECOMENDATIONS AND/OR
MODlFICATKINS TO FTNAUZE THE OWTS DESIGN AS NEEDED.
2. PROPOSED GRADES AND OWTS LAYOUT TO BE VERIFIED BY THE
CONTRACTOR AND INSPECTED BY THE ENGINEER. ALL OWTS
INSTALLATIONS, MATERIALS AND BACKFILL TO BE APPROVED BY
THE ENGINEER.
3. NEW ABSORPTION FIELD4SHALL BE MARKED AND
PROTECTED FROM VEHICULAR TRAFFIC
GEOTEXTILE SAND FM'? (GSF)
TREATMENT/ABSORFON BEDS
2,)"
LU
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N ri
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0
4" EFFLUENT LINE FROM TANK TO D -BOX
' a
BED 40W PAIR 4" MANIFOLD PIPE
ISTRIBUTTON BOX W/rIRSERS AND irf THE SURFA
USE 8'°PORT, CONCRETE, TUF-LITE EQUAL. INSTALL4 OVER N. 8"
AGGREGATE BASE COURSE OVEN COMPACTED SUBGRADE
INSTALL SNAP IN FLOW REGKA7�ON EACH OUTLET PIPE
OUTLET INV, =6576.5:
4" INDIVIDUALAIJISTRIBUTION LINES TO HE OF GSE ROW
USE 4" SDR -35 OR SCHD-401PVC W/ 18" MIN. Dell OF BURY. "BED
F{PE W/ SUITABLE NATIVE OR CL -6 ROAD BASE. STALL AT MIN. 1%
'CONNECTION TO PERFORATED' DISTRIBUTION PIPE INV. EL=65711/425t
4"DIA. L'PERFORATED DISTRIBUTION LATERAL PIPE INSTALLED AT THE TOP
CENTER OF THE IN -DRAIN UNITS RUN THE FULL LENGTH OF EACH ROW.
ORIENT PERFORATIONS DOWNWARD AT 5 AND 7 O'CLOCK. INSTALL
FIELD MARKERS,: AT THE SURFACE` ON EACH CORNER OF THE FIELD
INSPECTION PORT (TYP. END EA. ROW)
INSTALL SWEPT 90 Al END OF PERF. IgSTR.
PIPf k EXTENT 4" SOLID PVC RISER TO
SURFACE W/ NO-Gt.UE OR TREADED CAPS
TESTING, INSPECTIONS AND CONSTRUCTION MANAGEMENT
ADDITIONAL INSPECTIONS AND RECOMMENDATION WILL BE MADE BY THE
ENGINEER DURING CONSTRUCTION TO APPROVE THE LAYOUT OF THE
GEOTEXTILE SAND FILTER BED SYSTEM, VERIFY INSTALLATION OF
SPECIFIED MATERIALS AND OWS COMPONENTS.
PRIOR TO CONSTRUC TION OF THE PERMITTED SYSTEM THE ENGINEER
SHOULD BE CONTACTED BY THE PROJECT MANAGER/CONTRACTOR WELL
IN ADVANCE TO PROVIDE ADEQUATE TIME TO DISCUSS THE SYSTEM
COMPONENTS WITH THE CONTRACTOR, ANSWER QUESTIONS, RESOLVE ANY
CONFLICT ISSUES AND SCHEDULE INSPECTION SITE VISITS BASED ON
CONSTRUCTION PROGRESS. A PRE-OWS CONSTRUCTION MEETING WITH
THE ENGINEER, THE CONTRACTOR, AND/OR THE QUALIFIED INSTALLER IS
REOUIRED PRIOR TO INSTALLATION OF THE OWS COMPONENTS.
REGULATIONS REQUIRE THAT THE DESIGN ENGINEER OF RECORD PERFORM
SITE INSPECTIONS OF THE PERMITTED SYSTEM DURING CONSTRUCTION
AND PROVIDE "AS -BUILT' DOCUMENTATION OF THE INSTALLED SYSTEM TO
THE THE COUNTY AFTER CONSTRUCTION IS COMPLETE. WE RECOMMEND
THAT INSTALLED OWS COMPONENTS BE SURVEYED TO OBTAIN REQUIRED
AS -BUILT INFORMATION. REGULATIONS FURTHER REQUIRE THE COUNTY
ENVIRONMENTAL HEALTH DEPARTMENT BE CONTACED IN ADVANCE TO
PERFORM AN INSPECTION PRIOR TO FINAL BACKFILL OF COMPONENTS.
CONTRACTOR SHOULD DISCUSS ISSUES REGARDING SPECIFICATIONS,
INSTALLATION AND OPERATION OF OWS SYSTEMS AND CONTROLS WITH
THE SUPPLIER/INSTALLER AND/OR THE ENGINEER.
OUR DESIGN AND RECOMMENDATIONS ARE BASED UPON OUR EVALUATION
OF THE EXISTING AND PROPOSED SITE CONDITIONS AND INFORMATION
SUPPLIED TO US BY OTHERS. IF SITE CONDITIONS ARE FOUND TO BE
DIFFERENT FROM CONDITIONS ASSUMED OR INDICATED, WE SHOULD BE
NOTIFIED TO EVALUATE ANY EFFECT ON THE PROPOSED OWS.
GEOTEXTILE SAND FILTER ABSORPTION/TREATMENT FIELD
USE 40 ELGEN IN -DRAIN UNITS IN 4 BEDS WITH 2 ROWS OF 5 UNITS
PER EACH 225 SF BED. INSTALLED AT LEVEL GRADE OVER 12" OF
SELECT FILTER SAND (CONCRETE SAND) UNDERLAIN BY SANDY LOAM
SOILS. LOCATION OF GSF BED (MUST BE WITHIN.THE GENERAL LOCATION
SHOWN AND MEET ALL REQUIRED SETBACK REQUIREMENTS FOR 900 SF
str TOTAL 'ABSORPTION AREA. THE SYSTEM SHALL BE PLUMBED FOR
EQUAL DISTRIBUTION:TOP OF IN -DRAIN UNITS AT 1.5-2.5 EET BELOW
SURFACE GRADES.
4" OBSERVATION PEIZOMETER RISER
INSTALL FROM BATT OF SAND
LAYER USE 4" P ,. THREADED
CAP, SAW SLOTTED FORATED TO
TOP OF SAND (."<' ..,doi
4"PERFORATED
PVC (TYP)
OWTS Design Criteria:
Average daily flow (Q) = # of people x gal/person/day (avg. flow)
Max. Design flow (Qd) = Q x 1.5 (peaking factor) = gal/day (design)
5 bedroom house equivalent ® 2 persons per bedroom
Per capita flow = 75 gal/person/day
Qd = 5x2x75x1.5 = 1125 gal/day
Total Peak Design Flow is 1125 gal/day
Septic Tank Design:
Per regulations
Od = 1125 gal/day
Volume (V) of tank = Design Flow * 1.25 (30 hour retention time)
V = 1125 gal/day * 1.25 = 1406
Use one 1500 -gallon concrete two-compartment septic tank
The existing 1500 -gal septic tank was cleaned, inspected and found in
good shape for continued use. The tank was retrofitted with concrete
riser with reset lids at the surface. An effluent filter was installed in
the sanitary tee outlet.
Sub Surface Conditions and Testing:
Subsurfoce soil investigations and USDA soil texture method tests were
performed by Sopris Engineering in the area of the new proposed
secondary treatment absorption fields. One profile pits was excavated
by a backhoe approximately 8 feet deep to allow observation of the
soils in the area of the proposed field. The soils at 2.5 and 3.0 feet
deep were sampled and characterized by application of the usra soil
texture method test. The soils were tested to determine the
equivalent percolation rate based on the hydraulic loading rate and to
confirm the appropriate absorptive surface level suitable for conventional
absorption systems in native soils. The soils below nil to 4 inches of
topsoil consist of medium dense, blocky to granulor slightly sandy
clayey loam to clay loam clay material with gravel and cobbles to 0.3
to 3 feet below the surfoce.
The underlying native soil observed from 2.5 to 8 feet beow the
surface grades consist moderate granular slightly clayey sondy loam
with grovels and scattered cobbles. This soil has an effe.tive loading
rate for conventionol soil treatment of 0.7 Gal/S.F./day for a level 2
secondary treatment system. The equivalent percolation rote is 40 mpi
No free water was encountered in the exploration pit. GroJnd Water
levels are expectedto be below a minimum of 10 feet from the
existing surface grades.
The soils are suitable for treatment/absorption beds.
Previous geotechnical Testing:
A subsurface soil investigation was conducted by HP GEOTECH 2010
(HP report dated 11/19/2000, job N 100 362) in the areo near the
house. Three percolotion test holes were tested to calculate percolation
rates and to confirm the onsite soils are suitable for conventional
absorption systems. The average rate was determined to ae 44 MPI.
The subsoils below about 1 and 1/2 feet of topsoil consist of light
brown clay and sand with siltstone and shale fragments. rhese soil
were observed during our investigation of the existing sysem and
appear to be consistent with the soils shallow soils observed in the
proposed replacement field area.
Soil Absorption System Design:
The absorption field is designed based on utilizing the reported
percolation rate for the native soils and the application of a loading
factor reduction for single pass secondary treatment and use of water
saving fixtures. Install a Elgen In-Drain/Geotextile Sand Fiter (GSF)
Treatment System
The new absorption field will consist of multiple gravity d'stribution GSF
beds. The beds will be equally dosed through a new distrbution box.
Elgen In-Drain/Geotextile Sand Filter Treatment System Design
Area required for a Geotextile Sand Filter treatment bed:
Use a design percolation rate of 44 minutes per irch.
L.F. = 0.6 for low flow and secondary treatment
(non -conventional) with a
full 12- inch depth of filter sand.
A 40% reduction to Area for use of low flow fixtures and
secondary
treatment (non -conventional) with a full 12- inch depth of filter
sand
will be applied. ---
Standard absorption area equation yields:
A(sf) = (Qd *0)1 x L.F.: A = Area;
5 t = time in minutes per inch=44mpi
Qd = flow (gal/day) = 11:5 gad
L.D. = 0.6 L.F. = 0.8 for low flow and
secondary
(non -conventional)
A = = 675 *(44) 1 x 0.6 = 895 S.F.
8 In -Drain units per bedroom is recommended for the initial treatment.
trea tnen t
Use 40 Elven In -Drain units over select sand 12" deep, poced in 4
separate 25' by 9' beds with 2 rows of 5 In -Drains per each 225 SF
bed. Each In-Droin row is 20 feet long with a perforated distribution
pipe running the full length of the row. The four beds provide broad
distribution across a total of 900 S.F. at the infiltrative sirface of
each 225 SF bed. Each In -Drain unit is 4 -feet long by feet wide by
7 -inches deep and is placed over a minimum 12 -inch bel of sand
3 -feet wide. The total horizontal and vertical sand/soil interface Basal
area is 1172 S,F,
PLACE SAND UP TO
TOP OF IN -DRAIN
UNITS BETWEEN ROWS
INSTALLER SHALL INSTALL A 12' LAYER OF MEDIUM TO
COURSE CONCRETE SAND OR EQUIV. SEE EWEN IN -DRAIN
DESIGN AND INSTALLATION MANUAL FOR DETAILS
PLACE FILTER FABRIC OVER
INSTALLED SAND. IN -DRAINS AND
DISTRIBUTION PIPE PRIOR TO
BACKFILL. DO NOT BLOCK
HOLES IN PIPE
MAIN HOUSE TYPICAL CROSS SECTION
" 4" PERFORATED
DISTRIBUTION
LATERALS
NOT TO SCALE
TWO WAY CLEAN OUT
EFFLUENT FILTER
OUTLET TEE
PROPOSED GRADE
INSPECTION PORT
GRAPHIC SCALE
EXISTING
GRADE
DISTRIBUTION LINES
AT MIN 2% SLOPE
EFFLUENT DRAIN LINE AT
MIN 2% SLOPE
SEPTIC TANK
EFFLUENT DISCHARGE LINE
AT MIN 1% SLOPE
DISTRIBUTION BOX W/ RISER AND
LID AT THE SURFACE
PLACED FILTER FABRIC OVER
INSTALLED SAND, IN -DRAINS AND
DISRIBUTION PIPE PRIOR TO
BACKFILL. DO NOT BLOCK HOLES IN
PIPE
MAIN HOUSE OWS SECTION
N.T.S.
OWS SYSTEM NOTES
1. ALL MATERIALS AND INSTALLATION SHALL CONFORM TO STATE
AND COUNTY ONSITE WASTEWATER TREATMENT SYSTEMS (OWTS)
REGULATIONS.
2. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO CONTACT ALL
UTILITY COMPANIES FOR FIELD LOCATIONS OF UTILITIES PRIOR TO
CONSTRUCTION AND EXCAVATION.
3. ALL SEWER LINES TO BE SDR -35 BEDDED IN CLASS 6, SDR -26
BEDDED IN SCREENED NATIVE OR SCHEDULE 40 P.V.C. PIPE
BEDDED IN SCREENED NATIVE MATERIAL UNLESS NOTED
OTHERWISE.
4. INSTALL A TWO-WAY CLEAN OUT ON THE SERVICE LINE FROM THE
HOUSE.
5. THE CONTRACTOR SHALL ENSURE ALL SEWER LINES AND SEPTIC
TANKS ARE WATERTIGHT. ANY POTENTIAL PLUMBING LEAKS SHALL
BE REPAIRED TO AVOID EXCESSIVE WATER ENTERING THE SEPTIC
SYSTEM.
6. THE SEPTIC TANK SHALL BE INSTALLED LEVEL ON COMPACTED
EARTH. INSTALL WATERTIGHT RISERS AS NECESSARY TO BRING ALL
REQUIRED ACCESS POINTS TO THE FINISHED SURFACE GRADE.
7. A SANITARY BAFFLE TEE IS REQUIRED ON THE SEPTIC TANK INLET
AND OUTLET. INSTALL THE INLET AND OUTLET TEES PLUMB AND IN
A POSITION TO ALLOW EASY INSPECTION AND MAINTAINANCE OF
TANK FROM THE TANK RISERS.
8. WE RECOMMEND THE INSTALLATION OF A 4" EFFLUENT FILTER
CONTAINED IN THE 4" BAFFLE OUTLET TEE OF THE SEPTIC TANK.
THE FILTER SHOULD BE INSPECTED EVERY SIX MONTHS. THE
EFFLUENT FILTER SHALL BE MAINTAINED AND CLEANED WHEN THE
TANK IS PERIODICALLY PUMPED OR AS NECCESSARY. INSTALL A
SUITABLE EXTENSION ON THE FILTER WITH A HANDLE TO BE
WITHIN 6" BELOW THE ACCESS LID.
9. THE TREATMENT BED MUST BE MARKED AND PROTECTED TO
PREVENT DAMAGE FROM VEHICULAR AND LIVESTOCK TRAFFIC.
10. THE ENTIRE TREATMENT BED SURFACE MUST BE SODDED OR
RE -VEGETATED WITH GROUND COVER.
11. THE TREATMENT BED SURFACE MUST BE CROWNED TO DIVERT
SURFACE DRAINAGE AWAY FROM THE BED.
12. THE DIMENSIONS SHOWN ON THE PLAN INDICATE MINIMUM AREA
AND SEPARATION DISTANCES FOR THE OWS COMPONENTS.
13. THE BED SHALL BE LEVEL WITH DISTRIBUTION PIPES INSTALLED
FOR EQUAL GRAVITY DISTRIBUTION.
14. THE BED SHALL BE OVER EXCAVATED TO
THE SPECIFIED
DEPTH OF TREATMENT SAND . THE BOTTOM
AND SIDEWALLS OF THE EXCAVATION TO BE
NECCESSARY PRIOR TO PLACEMENT OF THE
ALLOW PLACEMENT OF
SURFAC E
SCARIFIED AND RAKED Ac.
SAND.
15. THE TREATMENT BED SHALL BE CONSTRUCTED WITH THE
IN -DRAINS UNITS PLACED OVER A MINIMUM 6 -INCH (OR AS SPECIFIED
ON THE PLANS) LAYER OF CONCRETE
SAND. THE SHALL BE PLACED AROUND THE UNITS UP TO THE TOP. THE
IN -DRAINS, TOP OF SAND AND DISTRIBUTION PIPES SHALL BE COVERED
WITH FILTER FABRIC.
16. THE MINIMUM COVER OVER THE TOP OF THE IN -DRAIN UNITS
SHALL BE 10 INCHES NOT TO EXCEED 36".
17. THE GSF IN -DRAIN UNITS WILL BE BACKFILLED
TO THE SURFACE WITH EXCAVATED MATERIAL VOID OF ROCKS. THE
BACKFILL MATERIAL SHALL NOT EXCEED 3" DIAMETER. A MINIMUM
4" DEPTH OF TOPSOIL IS TO BE PLACED ABOVE THE BACKFILL TO
THE FINISH SURFACE GRADE.
18. A 4" OBSERVATION PEIZOMETER RISER SHALL BE INSTALLED FROM
BOTTOM OF SAND LAYER ON THE ENDS OF EACH BED. USE 4" PVC W/
THREADED CAP, SAW SLOTTED PERFORATED TO TOP OF SAND (TYP.).
19. ALL INSTALLATION OF IN -DRAIN UNITS SHALL BE IN CONFORMANCE
WITH THE MANUFACTURES INSTALLATION INSTRUCTIONS.
THE ABSORPTION FIELD SHALL BE INSTALLED PER THE REQUIRES,
SETBACK DISTANCES:
10 feet from any property line.
25 feet from any potable water supply line.
20 feet from any occupied dwelling.
100 feet from ony well, spring or cistern.
25 feet from drainage swale or ditches
50 feet from any stream or water course.
GENERAL NOTES:
1. THE EXISTING LOT CONDITIONS AND OWTS SYSTEM DESIGN AS SHOWN
ON THE PLAN AND THE DETAILS WERE BY SOPRIS ENGINEERING.
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DATE: JUNE 9, 2014
JOB NO. 14092.01
SHEET C-1