HomeMy WebLinkAboutEngineer's OWTS Design PlanS
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EX. 1500 GALLON SEPTIC
TANK TO REMAIN. INSTALL
AN EFFLUENT FILTER IN
THE VERTICAL OUTLET TEE.
EX. SEWER PIPE
TO REMAIN
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10' MIN FROM
PROPERTY LINE
INSPECTION PORT AT EACH
END OF EACH LATERAL, BOTH
ENDS OF EACH BED, TYP.
4"Ø SDR35 PVC DISTRIBUTION LATERAL,
BOTH END OF EACH BED, TYP.
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EX. PRIMARY RESIDENCE
(4-BEDROOMS)
EX. GARAGE/ADU
(2-BEDROOMS)
4'
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Ø
4'
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4'
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4'
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4'
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4'
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4'
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Ø
TWO-WAY
DISTRIBUTION BOX
4"Ø SDR35 PVC
SEWER @ 2%. MIN.
C/
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INSTALL A TWO-WAY
CLEANOUT NEAR THE BEND
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EX. CLEANOUT
TO REMAIN
SALVAGE AND REUSE THE ORIGINAL 1000
GALLON SEPTIC TANK (ALSO REMOVE THE
INTERIOR BAFFLE) OR INSTALL A NEW 1000
GALLON ONE-COMPARTMENT SEPTIC TANK
UPSTREAM OF THE EX. TANK
EX. WELLS ARE MORE THAN 100'
AWAY FROM THE PROPOSED
ABSORPTION FIELD(S)
EX. SOLAR ARRAY
EX. SOLAR ARRAY
EX. GARDEN
4"Ø SDR35 PVC
SEWER @ 2%. MIN.
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1098 CR#214
County of Garfield,
State of Colorado
Parcel No: 2179-031-00-006
Silt
37110DERIC J O N WA
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COL O R A D O LICE
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SSIONA L E N G INEER
06/06/24
NORTH
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Da
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923 Cooper Avenue
Suite 201
Glenwood Springs, CO 81601
tele: 970.945.5252
fax: 970.384.2833
Engineer or Surveyor Seal
Sheet
Client Information:
PROJECT NO.
FILE NAME:
Designer:
Drafter:
Date:
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9.8.7.6.5.4.3.2.
06/06/24
DJW
DJW
24010-v-topo.dwg
24010
970.274.0064
Silt, CO 81652
1098 CR#214
Stephen Self
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C.1
00 30'60'
Scale: 1" = 30'
SITE EVALUATION
1.SITE AND SOIL EVALUATIONS WERE PERFORMED BY:
DERIC J. WALTER, PE KEVIN DYE, PE
BOUNDARIES UNLIMITED INC.GEO QUEST
923 COOPER AVE., STE. 201 PO BOX 1372
GLENWOOD SPRINGS, CO 81601 RIFLE, COLORADO 81650
970.945.5252 970.318.6784
2.EVALUATION DATE(S): MAY 27, 2024.
3.SETBACK REQUIREMENTS FOR A TREATMENT LEVEL 1 STA TRENCH/BED, UNLINED
SAND FILTER OR SEEPAGE PIT (PER TABLE 7-1) AND AN ADWF=825 GPD:
3.A.SPRING, WELL OR POTABLE CISTERN=100'
3.B.POTABLE WATER SUPPLY LINE=25'
3.C.STRUCTURE W/ BASEMENT/CRAWL SPACE=20'
3.D.STRUCTURE W/O BASEMENT/CRAWL SPACE=10'
3.E.PROPERTY LINE, PIPE OR LINED IRRIGATION DITCH=10'
3.F.INTERMITTENT IRRIGATION LATERAL, INFILTRATION STRUCTURE=25'
3.G.LAKE, WATER COURSE, IRRIGATION DITCH, STREAM OR WETLAND=50'
3.H.DRY GULCH, CUT BANK OR FILL AREA=25'
3.I.SEPTIC TANK=5'
3.J.RESTRICTIVE LAYER OR GROUNDWATER (VERTICAL): 4' (TREATMENT LEVEL 1,
GRAVITY FEED)
3.SETBACK REQUIREMENTS FOR THE SEPTIC TANK SHALL BE (PER TABLE 7-1):
3.A.SPRING, WELL OR POTABLE CISTERN=50'
3.B.POTABLE WATER SUPPLY LINE=10'
3.C.STRUCTURE W/ BASEMENT/CRAWL SPACE=5'
3.D.STRUCTURE W/O BASEMENT/CRAWL SPACE=5'
3.E.PROPERTY LINE, PIPE OR LINED IRRIGATION DITCH=10'
3.F.INTERMITTENT IRRIGATION LATERAL, INFILTRATION STRUCTURE=10'
3.G.LAKE WATER COURSE, IRRIGATION DITCH, STREAM OR WETLAND=50'
3.H.DRY GULCH, CUT BANK OR FILL AREA=10'
3.I.STA TRENCH/BED, UNLINED SAND FILTER OR SEEPAGE PIT=5'
SURFACE
12"
Scale: N.T.S.
Site & Soils Evaluation
SOIL EVALUATION
1.SOIL WAS CLASSIFIED BY THE GEOTECHNICAL
ENGINEER (GEO QUEST (PROJECT #24-157, MAY
27, 2024) AS USDA CLAY LOAM; TYPE 3A; WITH AN
LTAR OF 0.30 GPD/SF.
9'
±
SYSTEM DESIGN & CONSTRUCTION NOTES:
1.THIS DESIGN IS FOR A REPLACEMENT ABSORPTION FIELD. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH CDPHE REGULATION 43 ONSITE
WASTEWATER TREATMENT SYSTEM (OWTS) REGULATION, MOST CURRENT EDITION AND LOCAL AGENCY REQUIREMENTS WHICH MAY OR MAY NOT
SPECIFICALLY BE NOTED ON THE DRAWINGS. THE CONTRACTOR SHALL BE RESPONSIBLE FOR KNOWING AND CONFORMING TO SUCH SPECIFIC DETAILS
AS ARE REFERRED TO IN THE ABOVE MENTIONED REGULATIONS. THIS DRAWING DOES NOT CONSTITUTE AN OWTS PERMIT. A PERMIT MUST BE OBTAINED
FROM APPROPRIATE LOCAL AGENCY. THE CONTRACTOR MUST CONTACT THE LOCAL AGENCY HEALTH DEPARTMENT AND THE PROJECT ENGINEER FOR
INSPECTIONS OF THE CONSTRUCTED SYSTEM BEFORE BACKFILL. A REQUEST FOR INSPECTION BY THE PROJECT ENGINEER AND THE COUNTY
ENVIRONMENTAL HEALTH OFFICER MUST BE MADE AT LEAST 72-HOURS PRIOR TO THE DESIRED TIME OF BACKFILLING.
2.DEMAND CALCULATIONS (SEC.43.6.A.2.h)
2.A.FOUR (4) BEDROOM PRIMARY RESIDENCE AND A TWO (2) BEDROOM ADU USING TREATMENT LEVEL 1 (TL1).
2.B.AVERAGE DAILY WASTEWATER FLOW (ADWF) AND ORGANIC LOAD RATE (BOD5):
2.B.1.SINGLE FAMILY DWELLING: 75 gpdc & 0.20 BOD5 lbs/day
2.B.2.ADWF:
2.B.2.1.PRIMARY RESIDENCE = 75 gpd * (3 BEDROOMS * 2 PERSONS/BEDROOM + 1 BEDROOM * 1 PERSONS/BEDROOM) = 525 gpd
2.B.2.2.ADU = 75 gpd * (2 BEDROOMS * 2 PERSONS/BEDROOM ) = 300 gpd
2.B.2.3.TOTAL= 825 gpd
2.B.3.BOD5 = 0.20 lbs/day * 11 PERSONS = 2.20 lbs/day
BOD5 mg/L = BOD5*1,000,000 = 2.20 lbs/day*1,000,000 = 319.74 mg/L
ADWF*8.34 825 gpd*8.34
2.B.4.CBOD5 = BOD5 * 0.85 = 272 mg/L
3.SEPTIC TANK (SEC.43.9.B.2.a):
3.A.48-HOURS OF MINIMUM DETENTION TIME: ADWF * 48 hrs/24 hrs = 825 * 48 hrs/ 24 hrs = 1650 GALLONS.
3.B.EXISTING TANK IS 1,500-GALLON TWO COMPARTMENT TANK (SEPT-12-77-5046). INSTALL A 1,000 GALLON ONE-COMPARTMENT TANK UPSTREAM
OF THE EXISTING TANK.
3.C.THE TANK IS NOT SUBJECT TO BUOYANCY.
4.ABSORPTION AREA CALCULATIONS:
4.A.THE ABSORPTION AREA SLOPES GENTLY.
4.B.LONG TERM ACCEPTANCE RATE (LTAR) FOR TREATMENT LEVEL 1 (TL1) OF 0.30 gpd/SF (SEE SITE & SOILS EVALUATION NOTES/DETAIL).
4.C.MINIMUM SOIL TREATMENT AREA, A:
A = ADWF = 825 = 2,750 S.F.
LTAR 0.30 gpd/S.F.
4.D.SIZE ADJUSTMENT FACTORS: GRAVITY BED = 1.2; CHAMBERS = 0.7 (TABLE 10-1A).
4.D.1.A,adj = 2,750 SF * 1.2* 0.7 = 2,310 SF
4.E.GRAVELLESS CHAMBER BED SYSTEM:
4.E.1.INFILTRATOR QUICK4: 2,310 SF / 12 SF/UNIT = 193 UNITS. INSTALL 200 UNITS IN TWO (2) 4 x 25 UNIT BEDS.
4.E.2.ADS ARC 36: 2,310 SF / 15 SF/UNIT = 154 UNITS. INSTALL 160 UNITS IN TWO (2) 4 x 20 UNIT BEDS.
5.THIS SYSTEM IS SIZED FOR TYPICAL DOMESTIC WASTES ONLY. BACKWASH OR FLUSHING FLOWS FOR REVERSE OSMOSIS UNITS (EXCLUDING SMALL
UNDER-SINK) OR WATER SOFTENERS AND/OR FILTERS SHOULD NOT BE INTRODUCED INTO THIS SYSTEM.
6.CLEAN OUTS ARE REQUIRED AT THE HOUSE AND AT ALL BENDS AND AT LEAST EVERY 100-FEET BETWEEN THE HOUSE AND THE SEPTIC TANK.
7.THE CONTRACTOR SHALL BE RESPONSIBLE FOR INSTALLING ALL WATER TIGHT COMPONENTS THROUGHOUT THE SYSTEM TO PREVENT INFILTRATION.
8.INSTALL RISERS AS NECESSARY TO BRING ALL ACCESS PORTS TO FINAL GRADE. PORTS SHALL BE MARKED IF CAPS ARE TO BE BURIED.
9.INSTALL 3-INCHES OF BLUEBOARD INSULATION, 3-FEET WIDE, OVER SEWER AND EFFLUENT PIPE WHEREVER DEPTH IS LESS THAN 3-FEET. UNDER NO
CIRCUMSTANCES SHALL COVER BE LESS THAN 2-FEET.
10.SITE PLAN INFORMATION FROM OTHERS. LOCATIONS OF ALL COMPONENTS MAY BE VARIED AS NECESSARY AS LONG AS ALL MINIMUM DISTANCES AND
SLOPES MEET THOSE REQUIRED.
NO
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To New Castle
I-70
SITE
Vicinity Map
10
'
±
MAINTENANCE NOTES
1.TO ENCOURAGE THE HEALTH AND LONGEVITY OF THE OWTS SYSTEM, THE OWNER SHALL CONSIDER THE FOLLOWING:
1.A.MINIMIZE THE AMOUNT OF WATER THAT GOES DOWN THE DRAIN, THE BETTER YOUR SYSTEM WILL WORK.
1.B.MINIMIZE SOLIDS GOING DOWN THE DRAIN.
1.C.ELIMINATE GARBAGE DISPOSALS OR KEEP THE USE OF GARBAGE DISPOSALS TO A MINIMUM.
1.D.MINIMIZE GREASE AND OILS THAT GO DOWN THE DRAIN.
1.E.USE LINT FILTERS ON LAUNDRY MACHINE DRAINS.
1.F.KEEP SAND AND DIRT OUT OF THE BUILDING DRAIN.
1.G.AVOID FLUSHING SANITARY NAPKINS OR PAPER PRODUCTS OTHER THAN TOILET PAPER.
1.H.DO NOT USE LYE-BASED DRAIN UNCLOGGER CHEMICALS SUCH AS DRAINO, OVEN-OFF, OR OTHER STRONG
CLEANING AGENTS.
1.I.DO NOT PUT ANY “ROOT DETERRENTS” DOWN THE DRAIN.
1.J.DO NOT POUR PAINT THINNER, PESTICIDES, PAINTS OR PHOTO LAB CHEMICALS DOWN THE DRAIN
1.K.MINIMIZE USE OF CHLORINE BLEACH AND TOILET ADDITIVES.
2.THE OWNER SHALL CONTRACT WITH A SEPTIC TANK INSPECTOR TO INSPECT THE TANK ANNUALLY FOR GREASE AND
SEDIMENT ACCUMULATION. THE INSPECTOR SHALL REMOVED AND PROPERLY DISPOSED OF ACCUMULATED GREASE
AND SEDIMENT AS NEEDED TO ENSURE PROPER FUNCTION OF THE SYSTEM.
To Rifle
TOPSOIL
SC/CL
SAND, CLAY, SILT, TAN,
DRY TO MOIST,
CALCAREOUS, ORGANICS
FLOW
ATTACH REMOVABLE CAP OR
THREADED CLEANOUT ASSEMBLY.
INSTALL MARKER IF CAP IS TO
BE BURIED.
FINISH GRADE
4"Ø PVC RISER
4"Ø PVC TWO-WAY
CLEANOUT TEE
4"Ø SEWER LINE
Scale: N.T.S.
Two-Way Cleanout
BOTTOM TO BE LEVEL AND FLAT OVER ENTIRE AREA TO WITHIN
0.1'±. (TYP.). IF NECESSARY TO ACHIEVE THIS SURFACE, IMPORT
CONCRETE SAND TO USE AS LEVELING MATERIAL. REMOVE ANY
ENCOUNTERED BOULDERS AND BACKFILL WITH LOAMY SAND OR
SANDY GRAVELS. DO NOT USE COMPACTED MATERIALS.
GENERAL ABSORPTION AREA NOTES
1.INSTALL CHAMBER UNITS IN ACCORDANCE WITH
MANUFACTURER'S RECOMMENDATIONS.
2.ABSORPTION BEDS SHALL NOT EXCEED 12' WIDE BY
100-FEET IN LENGTH, SHALL PARALLEL THE
TOPOGRAPHY AND SHALL BE INSTALLED IN A
RECTANGULAR PATTERN WHENEVER POSSIBLE.
3.THE BOTTOM OF THE ABSORPTION BED SHALL BE
LEVEL AND THE BOTTOM AND SIDEWALLS MUST BE
RAKED TO REMOVE ANY SOIL SMEARS INCURRED
DURING THE EXCAVATION. FAILURE TO DO SO MAY
REQUIRE THE CONTRACTOR TO REPLACE THE
ABSORPTION FIELD AT HIS/HER OWN EXPENSE.
4.DRAINAGE SWALES ARE TO BE PROVIDED ABOVE
AND AROUND THE FIELD, AS NECESSARY, TO
PREVENT SURFACE RUNOFF FROM ENTERING
ABSORPTION AREA.
5.NO EXCAVATION OF THE ABSORPTION FIELD IS TO
BE DONE DURING WET WEATHER AND USE OF
RUBBER TIRE VEHICLES OVER THE ABSORPTION
AREA IS STRICTLY PROHIBITED.
6.UNSUITABLE MATERIAL EXISTING WITHIN THE FIELD
SHALL BE EXCAVATED AND BACKFILL SHALL
CONSIST OF IMPORTED LOAMY SAND OR SANDY
GRAVEL. THE ENGINEER SHALL BE CONTACTED IF
BEDROCK OR GROUNDWATER IS ENCOUNTERED IN
THE EXCAVATION.
7.TOPSOIL COVER MAY BE VARIED (1-FOOT MINIMUM,
2-FOOT MAXIMUM) TO ALLOW FOR LANDSCAPING.
8.WHEN MULTIPLE BEDS ARE USED, BEDS SHALL BE
SEPARATED BY 6-FEET MIN. OF UNDISTURBED
SOILS.
4"Ø PERFORATED PVC PIPE.
EXTEND PIPE TO REST ON
BOTTOM OF THE BED
COVER WITH 6" OF TOPSOIL
AND REVEGETATE
12
"
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24
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M
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GRAVELLESS CHAMBER SYSTEM:
INFILTRATOR QUICK 4, ADVANCED DRAINAGE
SYSTEMS BIODIFFUSER (STANDARD), OR
ENGINEER APPROVED EQUAL.
FILL OVER THE CHAMBERS
WITH UNCOMPACTED WELL
GRADED LOCAL SOILS.
4"Ø COUPLING (UNION). USE A
HOLE SAW TO CUT OUT CIRCLE
OFF THE CENTER OF THE UNIT
STANDARD INSPECTION PORT, TYP. (4"Ø PVC
SOLID PIPE CUT TO FIT. LOCATE PER PLAN
VIEW. ATTACH REMOVABLE CAP OR
THREADED CLEANOUT ASSEMBLY.
CIRCULAR IRRIGATION-STYLE VALVE
BOX & COVER - LID COLOR PURPLE
OR GREEN - LABEL "SEWER"
Scale: N.T.S.
Gravelless Chamber Absorption Bed
NOTE:
A 1000-GALLON LOW PROFILE SINGLE COMPARTMENT
NORWESCO POLYETHYLENE RESIN TANK IS ALSO ACCEPTABLE.