HomeMy WebLinkAboutEngineer's Design PlanMay 15th, 2024
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704 -0311 • Fax (970) 704 -0313
S OPRIS E NGINEERING • LLC civil consultants
Hansen, Linda S
3290 CR 210,
Rifle, CO 81650
C/O Jose Gonzalez
J. Caliber Construction
(970) 314-0489
RE: Design Report–Onsite Wastewater Treatment System (OWTS), Hansen Residence, 3290 County Rd 210,
Rifle, CO, Garfield County, Colorado
SE Job No. 34058 Parcel No: 217906300068. Garfield County OWTS Permit No._____________
Dear Linda:
This letter report presents the applicable findings in regard to the design and construction of a new Onsite
Wastewater Treatment System (OWTS) at the above referenced Site, in support of your OWTS permit application
to Garfield County. The OWTS design is based on recent site assessment observations by Sopris Engineering of
existing physical site features, conditions, geotechnical soils evaluation with respect to the proposed residential
usage and applicable regulatory design criteria in accordance with State and County OWTS Regulations. The design
recommendations, specifications and construction details are delineated on the attached OWTS permit/construction
plan “C1-OWTS Plan”, dated 05-15-2024. The design criteria and system sizing information is summarized below.
Existing and Proposed Conditions
The proposed OWTS area is situated on a pasture adjacent to existing residential development to the west and
agricultural land to the south and west in the north central portion of the 3.5-acre Parcel. The proposed OWTS will
serve a new garage structure with an ADU.
The subject 3.5-acre residential development area existing topography and site conditions are derived from county
GIS data base, aerial mapping, LIDAR topography, and survey information based on the Survey Site Plan by
Bookcliff Survey Services, Inc., dated 2-9-24. The site is situated in existing irrigated agricultural land primarily
consisting of meadow and hayfield grasses west of the existing developed facilities. The proposed development area
is in a broad flat to gently sloped (0% to 5%) meadow that generally trends downgradient to the west. The proposed
OWTS field will be constructed parallel to the fence on the westerly faced slope of the terrain.
The proposed development will consist of the construction of a 1,200 S.F two-story garage/accessory structure with
a 1-bedroom residential apartment dwelling on the upper floor. The proposed site improvements will include
associated driveway, auto court, utilities and a new onsite wastewater treatment system. The development will be
based on applicable site design criteria and include appropriate grading, drainage, and site construction
management. The proposed development improvements and site layout plan is shown on the attached OWTS plan.
Summary Design Criteria
The new OWTS is designed for a treatment capacity of 300 gallons per day based on the design wastewater flow to
serve a minimum 2-bedroom residence in accordance with Table 6-2 values, Section 43.6, A.4. The new OWTS will
utilize a minimum 1,000 gallon two-compartment reinforced plastic or alternative concrete septic tank to be
installed off the westerly corner of the proposed structure. Sealed ribbed PVC risers with lids will be installed on
the new septic tank along with appropriate pipe connection to the new tank utilizing the appropriate fitting adaptor
Hansen Residence
3209 County Rd 210, Rifle, CO
SE Job No. 34058.01
May 15, 2024
Page2
rings for the tank and riser. The new 1,000 gallon 2-compartment septic tank will be installed with appropriate
sanitary tees, outlet effluent filter with risers and lids at the surface. A gravity schedule-40 or SDR-35 sewer pipe
section with two-way cleanout will be installed between the tank inlet on the gravity sewer line and the accessory
structure.
The soil treatment area (STA) will consist of leaching chamber trenches that provide 360 S.F. of total absorption
area. The septic tank effluent will be gravity discharged through a new 4-inch schedule-40 or SDR-35, installed at
minimum 1.5% slope, to the STA via a distribution box. The effluent will be equally distributed from the
distribution box via 4” distribution pipes connected to the head end cap of each chamber trench. Observation ports
with caps will be installed on the proximal and distal ends of each chamber trench. The design is in compliance with
the current County regulations with design calculations based on the soil type, texture and structure with an
appropriate long term acceptance rate (LTAR). The designed system meets all required setbacks and will be
installed within the general location indicated on the plan. Our design is outlined below and delineated on the
attached C-1 OWTS plan.
Design Flow
The design flow is calculated as follows for the minimum design capacity of an equivalent 2-bedroom residential
dwelling. The OWTS is designed for a treatment capacity of 300 gallons per day based on the design wastewater
flow in accordance with Table 10-1 values, Section 43.6, A.4. Regulation 43:
Minimum population based on 2 bedrooms at 2 persons per bedroom equating to 4 persons.
The Design flow is calculated based on residential usage of 75 gal/person/day, No PF
Max. Design flow (Qd) gallons/day = (# of people) x (avg. flow) gal/person/day.
Design flow Qd = 4*75=300 gpd
Septic Tank Design
The septic tank capacity required for a minimum 48 hour retention time is calculated as follows:
V = 300 gal/day * 2 = 600 gallons. Use a 1,060 gallon 2-compartment reinforced plastic septic tank. The tank to be
installed with risers and access lids set a minimum 3 inches above finish grade surface.
Sub Surface Conditions and Testing
A subsurface soil investigation and site assessment was performed by Sopris Engineering on May 9th, 2024. The
soils in the proposed field envelope area were sampled and characterized by application of the USDA visual/tactile
soil texture method analysis from samples in two profile pits. Generally the soils below approximately 6 inches of
topsoil consist of medium dense sandy silt loam texture soil with slightly blocky to granular structure to the profile
pit depth of 8 feet. The soils contain less than 10% scattered gravel or rock content to the 8 -feet depth explored
below the surface grades. No free water was encountered in the pit excavations. No evidence of seasonal high
ground water or redox conditions was observed in the profile pits. Seasonal high groundwater levels are expected to
be below 10 feet from the existing surface grades on the relatively flat terrain.
The native soils sampled from 2-3 feet below the surface, in the vicinity of the proposed field, are characterized as a
soil type 2 consisting of sandy silt loam texture with granular structure. This soil has an effective loading rate for
conventional soil treatment of 0.6 Gal/S.F./day for a level 1 convent ional treatment system. The equivalent
percolation rate is assumed to be 20-30 minutes per inch. The soils are suitable for a shallow conventional
absorption field consisting of gravelless infiltration chamber units.
Hansen Residence
3209 County Rd 210, Rifle, CO
SE Job No. 34058.01
May 15, 2024
Page3
Additional observations and soil evaluation will be performed during construction, by Sopris Engineering
in the area of the proposed absorption field and tank to confirm the previous soil evaluation and design
criteria. If soil conditions encountered require adjustments to design criteria or the design plan notice will
be made to County EHD and applicable revisions to design/construction plans and report will be
submitted. The location of the installed OWTS components will be included in the As-Constructed
documentation.
Treatment-Soil Treatment Unit/ Absorption System Design
The treatment/absorption field is designed based on utilizing the effective Long Term Acceptance Rate (LTAR) for
the native soils and the application of appropriate loading factors for a soil treatment unit system utilizin g gravity
distribution to gravelless chamber trenches. The new treatment system and absorption field will consist of gravity
distribution of septic tank effluent via a distribution box to individual chamber trenches with treatment across the
native soil absorptive surface.
Long Term Acceptance Rate (LTAR)
Considering the application of the state regulation 43:
Receiving Wastewater Treatment Level 1;
LTAR; (Table 10-1 Soil type 2 loading rate for a sandy silt loam is (0.6 gal./S.F./day);
Design Flow; Qd = flow (gal/day) = 300 gpd
Loading factors; (Table 10-2, Gravity application trenches, L.F.1 = 1.0)
(Table 10-3, Gravelless chambers, L.F.2 = 0.7)
STU absorption treatment area; A = Area S.F.;
A(sf) = Qd x L.F.1 x L.F.2 .: A(sf) = 300 gpd x 1.0 x 0.7 = 350 S.F.
LTAR 0.6 Gal/S.F./day
Number of Quick-4 Infiltrator chambers 4'x3'x12"chambers:
350 S.F. = 29 chambers; Use 30 chambers
12 S.F./Chamber
Number of Equivalent Arc chambers 5'x3'x12"chambers:
350 S.F. = 23 chambers; Use 24 chambers
15 S.F./Chamber
Use 30 Quick-4 Infiltrator chambers in 2 trenches 62' long by 3' wide with 15 chambers units per trench plus two
end caps as delineated on the plan. Alternatively use 24 Arc chambers in 2 trenches 60' long by 3' wide with 12
chambers units per trench with ends caps. The septic tank effluent will be gravity distributed to the head of each
chamber row via individual distribution pipes from a distribution box.
Construction and Inspections
Prior to construction of the permitted system, the engineer should be contacted by the contractor and owner 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-OWTS construction
Hansen Residence
3209 County Rd 210, Rifle, CO
SE Job No. 34058.01
May 15, 2024
Page4
meeting is essential and required prior to installation of the OWTS. All septic system components shall be staked in
the field for approval by the Engineer prior to excavation.
During initial construction the engineer will evaluate the soils in the absorption treatment field excavations to
confirm soil conditions and make adjustments as needed. All septic system components and trench installations are
to be approved by the Engineer prior to backfilling. County Regulations require that the Engineers of record
perform site inspections of the permitted system during construction and provide “As-Constructed” documentation
of the installed system to the County after construction is complete. All installation will be inspected, field
measured, reported and delineated in the certification letter and record drawing. The contractor needs to photo
document all OWTS construction phases and supply photos to the Engineer.
The County Environmental Health department should be contacted at least 48 hours prior to final backfill of
components to provide advanced notice of construction schedule in order to perform a final inspection of the
in place components. The County Environmental Health department should be contacted at least 48 hours prior to
final backfill of components to provide advanced notice of construction schedule in order to perform a final
inspection of the in place components. The Garfield County contact is: Ted White, P.E., Environmental Health
Specialist III. Garfield County Public Health; twhite@garfield-county.com, 970-945-6614 x 8106 (main office) or
970-230-2442 (mobile)
OWS Operation and Maintenance
Ownership of the system and responsibility for maintenance and repair will remain with the property Owner. The
Owner is encouraged to retain the services of qualified personnel to inspect the OWTS and to perform all
maintenance and repairs necessary to ensure that the system components are maintained in good operating condition
and suitable vegetative cover is established on the fields. The components of the OWTS system should inspected
within 30 days of being placed into operation and should been inspected and maintained bi-annually. The tank,
absorption field and other system components should be visually inspected bi-annually for debris, damage, leaks, or
other potential problems. In general, for a properly utilized system, septic tanks should be pumped every 3 – 5 years.
The effluent filter should be cleaned every six months and at the time of pumping. Absorption fields should be
maintained with suitable vegetative cover and kept free of root invasive plants. Positive surface drainage away from
the absorption field should be maintained.
If you have any question or need any additional information, please call.
Sincerely,
SOPRIS ENGINEERING, LLC
Paul E. Rutledge Yancy Nichol, PE
Design Engineer Principal
x
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EXISTING PROPANE TANK
SHED ON
CONCRETE
PROPOSED GARAGE
24'X24'
EXISTING ONE STORY WOOD FRAME HOUSE
SHED
SPIGOT
4''SS
4''SS
4''SS
4''SS
4''SS4''SS4''SS
4" PVC DISTRIBUTION PIPE, INSTALL
INTO UPPER END PENETRATION OF
END CAP (TYP.)
PROPOSED 4"
2-WAY CLEANOUT
4" PVC GRAVITY SEWER PIPE. 2%
SLOPE ±, BED & BACKFILL W/ CLASS-6
4" PVC EFFLUENT PIPE @ MIN. 1%,
USE SCHD-40 OR SDR-26
BED & BACKFILL W/ SELECT NATIVE
OR CLASS-6
INSTALL A 2-COMPARTMENT 1060-GALLON PLASTIC SEPTIC TANK
(USE VALLEY PRECAST ITEM-15-IM-1060-2CPa OR EQUAL)
INSTALL INLET SANITARY TEE & OUTLET EFFLUENT FILTER ASSEMBLY.
INSTALL WITH (2) 24" DIA. BY 12" DEEP PLASTIC RISERS WITH LIDS.
TOP OF RISERS/LIDS TO BE INSTALLED @ + 3" ABOVE FINISH GRADE.
INSTALL 4" RISER PIPE INSPECTION PORT EXTEND
RISER W/ PUSH ON CAP MIN. 4" BELOW FINISH
GRADE & COVER WITH 6" DIA. VALVE BOX SET
WITH LID 1" ABOVE FINSH GRADE
EACH TRENCH CHAMBER END CAP)
INSTALL CHAMBER END CAP
ON ALL END CHAMBERS
VARIABLE TRENCH EXCAVATION DEPTHS.
EACH TRENCH SURFACE ABSORPTIVE SURFACE
APPROX, 2'-3' BELOW EXISTING GRADE
TOP PERIMETER OF FIELD SURFACE TO BE
MOUNDED 4" ABOVE SURFACE GRADES
CONCRETE DISTRIBUTION BOX WITH BAFFLE
INSTALLED LEVEL ON COMPACTED BASE
INSTALL RISERS AND LID TO SURFACE
STA ABSORPTION/TREATMENT FIELD
USE 30 QUICK-4 CHAMBERS IN 2 TRENCHES 62' LENGTH
WITH 15 CHAMBERS PER TRENCH PLUS END CAPS FOR
A TOTAL ABSORPTION AREA OF 360 S.F.
5456
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DATE REVISION
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OWTS PLAN
1 inch = ft.
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GRAPHIC SCALE
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34058JOB NO.
DATE:05-15-24
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NOTE: ALL CHAMBERS IN EACH TRENCH MUST BE INSTALLED ON
LEVEL GRADE OVER 3" ASTM-33 FILTER SAND LEVELING COURSE.
MAXIMUM DEPTH OF TRENCHES NOT TO EXCEED 36" BELOW
PROPOSED SURFACE GRADES. INLET AND END CAPS ARE TO BE
INSTALLED ON EACH END CHAMBER ROW. IF EXCESSIVE LARGE
COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE
EXCAVATION, OVER EXCVATE AND BACKFILL WITH SAND OR
SUITABLE SCREENED NATIVE SOILS.
BACKFILL WITH SCREENED
ONSITE SOILS FREE OF ROCKS IN
EXCESS OF 3" DIAMETER OR USE 3/4"
TO 1.5' SCREENED ROCK
CROWN FIELD TRENCH TO
DIVERT SURFACE WATER
FILTER FABRIC
4' MIN
LEACHING
CHAMBER
12"
6"
N.T.S.
BACKFILL LAYER NATURAL ONSITE
SOILS FREE OF ROCKS
4" PVC INLET PORT
IN END CAP
SCARIFY/TILL BOTTOM SURFACE TO A
DEPTH OF 3"
HARVEY Design Calculations OWTS
The proposed onsite wastewater treatment system (OWTS) is being installed to serve an ADU and garage.
The design flow treatment capacity is calculated as follows for a minimum equivalent 2-bedroom single family
residence.
From the Regulation 43 usage table :
Minimum population based on 2 bedrooms = 4 persons.
Gallons per day per person = 75 gal/person/day, No peaking factor
Max. Design flow (Qd)gallons/day = (# of people) x (avg. flow)gal/person/day.
Design flow Qd =4*75=300 gpd
Septic Tank Design:
Use a 1000 gallon, two compartment plastic septic tank with an effluent filter outlet sanitary tee in the second
chamber. Tank shall be installed with sealed plastic risers and lids to the finish grade surface.
Preliminary Sub Surface Conditions and Testing:
A subsurface soil investigation and site assessment was performed by Sopris Engineering on May 9th, 2024. The
soils in the proposed field envelope area were sampled and characterized by application of the USDA
visual/tactile soil texture method analysis from samples in two profile pits. Generally the soils below
approximately 6 inches of topsoil consist of medium dense sandy silt loam texture soil with slightly blocky to
granular structure to the profile pit depth of 8 feet. The soils contain less than 10% scattered gravel or rock
content to the 8-feet depth explored below the surface grades. No free water was encountered in the pit
excavations. No evidence of seasonal high ground water or redox conditions was observed in the profile pits.
Seasonal high groundwater levels are expected to be below 10 feet from the existing surface grades on the
relatively flat terrain.
The native soils sampled from 2-3 feet below the surface, in the vicinity of the proposed field, are characterized
as a soil type 2 consisting of sandy silt loam texture with granular structure. This soil has an effective loading
rate for conventional soil treatment of 0.6 Gal/S.F./day for a level 1 conventional treatment system. The
equivalent percolation rate is assumed to be 20-30 minutes per inch. The soils are suitable for a shallow
conventional absorption field consisting of gravelless infiltration chamber units.
Soil Treatment Unit/ Absorption System Design:
The treatment/absorption field is designed based on utilizing the effective Long Term Acceptance Rate (LTAR)
for the native soils and the application of appropriate loading factors for a soil treatment unit system utilizing
gravity distribution to gravelless chamber trenches. The new treatment system and absorption field will consist
of gravity distribution of septic tank effluent via a distribution box to individual chamber trenches with
treatment across the native soil absorptive surface.
Long Term Acceptance Rate (LTAR):
Considering the application of the state regulation 43:
Receiving Wastewater Treatment Level 1;
LTAR; (Table 10-1 Soil type 2 loading rate for a silt loam is (0.6 gal./S.F./day);
Design Flow; Qd = flow (gal/day) = 300 gpd
Loading factors; (Table 10-2, Gravity application trenches, L.F.1 = 1.0 )
(Table 10-3, Gravelless chambers, L.F.2 = 0.7)
STA absorption treatment area; A = Area S.F.;
A(sf) = Qd x L.F.1 x L.F.2.: A(sf) = 300 gpd x 1.0 x 0.7 = 350 S.F.
LTAR 0.6 Gal/S.F./day
Number of Quick-4 Infiltrator chambers 4'x3'x12"chambers:
350 S.F. = 29 chambers; Use 30 chambers
12 S.F./Chamber
Number of Equivalent Arc chambers 5'x3'x12"chambers:
350 S.F. = 23 chambers; Use 24 chambers
15 S.F./Chamber
Use 30 Quick-4 Infiltrator chambers in 2 trenches 62' long by 3' wide with 15 chambers units per trench plus
two end caps as delineated on the plan. Alternative use 24 Arc chambers in 2 trenches 60' long by 3' wide with
12 chambers units per trench with ends caps. The septic tank effluent will be gravity distributed to the head of
each chamber row via individual distribution pipes from a distribution box.
1.ADDITIONAL GEOTECHNICAL EVALUATIONS AND INSPECTIONS BY THE ENGINEER SHOULD BE PERFORMED
DURING INITIAL STAGES OF CONSTRUCTION TO VERIFY SOIL CONDITIONS AND OWTS DESIGN.
2.THE EVALUATIONS AND INSPECTIONS MAY RESULT IN MODIFICATIONS TO THE DESIGN THAT MAY INCLUDE
FIELD SIZE REVISIONS AND POSSIBLE SOIL REPLACEMENT IN SELECT AREAS IF NEEDED. SUFFICIENT NOTICE
TO THE ENGINEER BY THE PROJECT MANAGER/CONTRACTOR NEEDS TO BE MADE IN ORDER TO SCHEDULE
THE SITE INSPECTIONS.
3.PRIOR TO CONSTRUCTION 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.
4.COUNTY REGULATIONS REQUIRE THAT THE DESIGN ENGINEERS OF RECORD PERFORM SITE INSPECTIONS
OF THE PERMITTED SYSTEM DURING CONSTRUCTION AND PROVIDE "AS-BUILT" DOCUMENTATION OF THE
INSTALLED SYSTEM TO THE COUNTY AFTER CONSTRUCTION IS COMPLETE. THE ENGINEER SHOULD BE
CONTACTED AND NOTIFIED OF THE CONSTRUCTION SCHEDULE.
5.THE COUNTY ENVIRONMENTAL HEALTH DEPARTMENT SHOULD BE CONTACTED AT LEAST 48 HOURS PRIOR
TO FINAL BACKFILL OF COMPONENTS TO PROVIDE ADVANCED NOTICE OF CONSTRUCTION SCHEDULE IN
ORDER TO PERFORM A FINAL INSPECTION OF THE IN PLACE COMPONENTS. The Garfield County contact is:
Ted White, P.E., Environmental Health Specialist III.Garfield County Public Health;
twhite@garfield-county.com, 970-945-6614 x 8106 (main office) or 970-230-2442 (mobile)
6.OUR DESIGN AND RECOMMENDATIONS ARE BASED OUR SITE ASSESSMENT, SOIL EVALUATION AND UPON
INFORMATION SUPPLIED TO US BY OTHERS. IF SUBSURFACE OR SITE CONDITIONS ARE FOUND TO BE
DIFFERENT FROM CONDITIONS ASSUMED OR INDICATED, WE SHOULD BE NOTIFIED TO EVALUATE ANY
EFFECT ON THE PROPOSED OWTS. IF THE COUNTY REQUESTS CHANGES OR MODIFICATIONS TO THIS
DESIGN, WE SHOULD BE CONTACTED TO EVALUATE AND RESPOND TO THE REQUEST.
7.CONTRACTOR SHOULD REVIEW ANY CONDITIONS ON THE ISSUED PERMIT AND COORDINATE WITH THE
ENGINEER REGARDING CONSTRUCTION OF THE SYSTEM. THE CONSTRACTOR AND/OR SYSTEM INSTALLAR
SHOULD PHOTO DOCUMENT ALL PHASES OF OWTS CONSTRUCTION AND INSTALLATION OF COMPONENTS.
8.IF YOU HAVE ANY QUESTION OR NEED ANY ADDITIONAL INFORMATION, PLEASE CALL PAUL RUTLEDGE AT
SOPRIS ENGINEERING, 704 0311.
1.AN EFFLUENT FILTER SHALL BE INSTALLED IN THE DISCHARGE TEE IN THE SECONDARY COMPARTMENT OF
THE SEPTIC TANK. WE RECOMMEND THE INSTALLATION OF AN ORENCO SYSTEMS 4" EFFLUENT FILTER
FILTERED EFFLUENT TAHT WILL DISCHARGE TO A CONCRETE DISTRIBUTION BOX WITH RISERS AND LID AT
THE SURFACE.
2.THE DISTRIBUTION SYSTEM WILL BE INSTALLED TO ALLOW FOR EFFLUENT TO BE EQUALLY DISTRIBUTED
TO THE ABSORPTION TRENCHES VIA INDIVIDUAL 4" DISTRIBUTION LINES CONNECTED TO THE HEAD OF
EACH CHAMBER TRENCH.
3.THE MINIMUM SLOPE OF THE DISCHARGE LINE FROM THE TANK TO THE DISTRIBUTION BOX SHALL SHALL
BE INSTALLED AT A MINIMUM 1% SLOPE. THE INDIVIDUAL DISTRIBUTION LINES AT THE HEAD OF THE
TRENCHES SHALL BE INSTALLED AT A MINIMUM OF 2% SLOPE.
1.ALL MATERIALS AND INSTALLATION SHALL CONFORM TO STATE AND COUNTY ONSITE WASTEWATER
TREATMENT SYSTEM (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 OR SCHEDULE 40 P.V.C. PIPE UNLESS NOTED OTHERWISE.
4.INSTALL A TWO-WAY CLEAN OUT ON THE SERVICE LINE FROM THE STRUCTURE AND AN ADDITIONAL
CLEANOUT WITHIN 100' SECTION OF EFFLUENT DISCHARGE PIPE.
5.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. BACKFILL WITH
SUITABLE NATIVE SOIL FREE OF BOULDER AND ROCK IN EXCESS OF 3" DIAMETER.
6.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 MAINTENANCE OF TANK
FROM THE TANK RISERS.
7.INSTALL A 4" EFFLUENT FILTER ON THE 4" 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 NECESSARY. INSTALL A SUITABLE EXTENSION ON THE FILTER WITH
A HANDLE TO BE WITHIN 6" BELOW THE ACCESS LID.
8.THE CONTRACTOR SHALL ENSURE THAT THE SEWER LINES, SEPTIC TANK AND RISERS ARE WATERTIGHT.
ALL PLUMBING FIXTURES AND OWTS COMPONENTS SHALL BE INSTALLED AND MAINTAINED TO AVOID
SURFACE OR GROUNDWATER FROM ENTERING THE SYSTEM AND TO PREVENT LEAKAGE FROM THE
SYSTEM.
9.THE DIMENSIONS AND NOTES SHOWN ON THE PLAN INDICATE MINIMUM AREA, LENGTH, WIDTHS AND
SEPARATION DISTANCES FOR THE TRENCHES, BED OR MOUNDED ABSORPTION FIELD.
10.THE ABSORPTION TRENCHES SHALL BE EXCAVATED TO LEVEL GRADE IN NATIVE EARTH. THE TRENCH
BOTTOM AND SIDEWALLS SHALL BE SCARIFIED AND/OR RACKED IF SMEARING OCCURS. IF EXCESSIVE
LARGE COBBLES OR BOULDERS ARE ENCOUNTERED IN ANY PART OF THE EXCAVATION OVER 6" FROM THE
PROPOSED TRENCH BOTTOM SURFACE, OVER EXCAVATE AND BACKFILL WITH SAND.
11.THE LEACHING CHAMBERS SHALL BE INSTALLED LEVEL WITH A MINIMUM COVER OF 10 INCHES NOT TO
EXCEED 24 INCHES.
12.LEACHING CHAMBERS WILL BE PLACED IN THE EXCAVATION OVER THE NATIVE SOIL OR SELECT SOIL
REPLACEMENT OR ASTM-33 SAND LEVELING COURSE. END CAPS SHALL BE INSTALLED ON THE END
CHAMBERS IN EACH TRENCH.
13.VERTICAL INSPECTION PORTS SHALL BE INSTALLED FROM THE PRE MARKED HOLE ON THE TOP OF EACH
END CHAMBER OR END CAP. (TYP. BOTH ENDS OF EACH ROW) THE PORTS MAY HAVE THREADED CAPS AT
GRADE OR HOUSED IN A 6" VALVE BOX.
14.THE CHAMBERS WILL BE BACKFILLED WITH EXCAVATED MATERIAL VOID OF ROCKS, THE BACKFILL
MATERIAL SHALL NOT EXCEED 2 1/2" DIAMETER AND SHALL BE PLACED TO AT LEAST 6 INCHES ABOVE THE
TOP OF THE CHAMBERS. THE TOP OF THE PLACED BACKFILL SHALL BE COVERED WITH A LAYER OF FILTER
FABRIC. A MINIMUM 3" DEPTH OF TOPSOIL IS TO BE PLACED ABOVE THE BACKFILL TO THE SURFACE & RE
VEGETATED.
15.INSTALLATION OF LEACHING CHAMBERS SHALL BE IN CONFORMANCE WITH THE MANUFACTURERS
INSTALLATION INSTRUCTIONS.
16.THE ABSORPTION TRENCHES/BED OR MOUND MUST BE GENERALLY MARKED AT THE FOUR CORNERS
WITH INSPECTION PORTS AND/OR BURIED REBAR. THE FIELDS MUST BE PROTECTED FROM VEHICULAR
AND LIVESTOCK TRAFFIC.
17.THE ABSORPTION FIELD SURFACES MUST BE SLOPED OR SLIGHTLY MOUNDED TO DIVERT SURFACE
DRAINAGE AWAY FROM THE FIELD.
18.THE ABSORPTION FIELD SHALL BE INSTALLED PER THE REQUIRED SETBACK DISTANCES:
10 FEET FROM ANY PROPERTY LINE.
25 FEET FROM ANY POTABLE WATER SUPPLY LINE.
20 FEET FROM ANY OCCUPIED DWELLING WITH CRAWL SPACE .
100 FEET FROM ANY WELL, SPRING OR CISTERN.
50 FEET FROM ANY STREAM OR WATER COURSE.
NATIVE, YARD OR LANDSCAPED
SURFACE
N.T.S.
COMPACTED SUBGRADE
4" SDR35
3" DIA
4" SCH40
4" SCH404" SDR35
3" DIA
CHAMBER END CAP
CONNECT INDIVIDUAL 4" DISTRIBUTION PIPE
TO HEAD OF EACH CHAMBER TRENCH (TYPICAL EACH TRENCH).
INSTALL CONNECTION AS NEEDED FROM END OR SIDE INLET
PORT OF EACH INFILTRATOR CHAMBER END CAP.
N.T.S.
SUITABLE BACKFILL OR
CLASS 6 ROAD BASE
1.THE OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE DESIGNED BY SOPRIS ENGINEERING.
2.THE EXISTING/ PROPOSED LOT CONDITIONS BY SOPRIS ENGINEERING & BOOKCLIFF SURVEY AND
SURVEY/PLAT INFORMATION SHOWN IS BASED ON SITE PLAN BY BOOKCLIFF SURVEY, 01-19-24.
3.PRIMARY OWNER NAME AND ADDRESS: HANSEN LINDA S, 3290 COUNTY ROAD 210 (MILE POND), RIFLE,
CO 81650, CONTACT: CRAIG HANSEN, hansencraiga@gmail.com, (970) 618-4535.
4.SITE ADDRESS: 3290 COUNTY ROAD 210, RIFLE, CO 81650
5.Legal Summary: Section: 6 Township: 6 Range: 92 TR OF LAND IN LOTS 5&6, ALSO A TR OF LAND CONT
2.432 AC +/- S DESC IN BNDY LINE ADJ BK 1545/934 AND BK 1533/412 EXCEPT A TR OF LAND CONT .842 AC
+/- AS DESC IN BNDY LINE ADJ BK 1545 934 AND BK 1533/412.
6.Parcel Number: 217906300068
7. COUNTY SEPTIC PERMIT #: ____________, ISSUED ______________
8.CONTRACTOR: J CALIBER CONSTRUCTION, 970-314-0489
6" MIN.
4" MIN.
6" MIN.
4"4"
4" DISTRIBUTION
GRAVITY LINE
FROM SEPTIC TANK
INVERT IN
N.T.S.
4" SOLID PVC GRAVITY
DISTRIBUTION PIPES (TYP.)
TO ABSORPTION FEILD
BAFFLE
COMPACTED SUBGRADE
8" AGREGATE BASE COURSE
RISER SECTION
DISTRIBUTION BOX LID
AT GROUND SURFACE
4" SDR35
3" DIA
4" SCH40
4" SCH40
4" SDR35
3" DIA
N.T.S.
4" EFFLUENT PIPE FROM
DISTRIBUTION BOX
4" INSPECTION PORT RISER
6" VALVE BOX
QUICK-4 INFILTRATOR
OR EQUAL BIO DIFFUSER
CHAMBER
QUICK-4 INFILTRATOR
END CAP
EXTEND 4" RISER PIPE
MIN. 3" THROUGH END
CAP OR CHAMBER PRE
FORMED PENETRATION
SECURE WITH SCREWS
THROUGH PENETRATION
FLANGE INTO PIPE CAP
6" VALVE BOX
EXCAVATED MATERIAL COMPACTED
TO 90% STANDARD PROCTOR UNDISTURBED EARTH
SILTY LOAM SOIL.
REVEGATATION
TOPSOIL LAYER
N.T.S.
05/15/24
05/15/24