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BROCK CIVIL, LLC
Professional Services
P.O. BOX 23
Eagle, CO 81631
Cell 970-471-2121
May 21, 2024
Borah Barn/ADU
3207 CR #342
Silt, CO
Garfield County, CO
PN 245502200038
DESIGN CALCULATIONS FOR SEPTIC SYSTEM
REFERENCES
Garfield County Public Health Agency On -Site Wastewater Treatment System Regulations adopted March 6, 2023 ("Regulations").
Colo. Dept. of Public Health and Environment Regulation #43 5 CCR 1002-43.
DESIGN FLOWS
Number of bedrooms = 2
Number of persons per bedroom = 2 (design flow)
Single Family Residential Design Flows = 75 gallons/day/person
Q design = 2 bdrms x 2 persons/bdrm x 75 gallons/person/day = 300 gpd
SOILS PROFILE (Visual and tactile investigation):
Soil type 2A (SEE USDA)
CHAMBER TRENCH CONSTRUCTION: Install chambers onto each undisturbed trench (approx) 3 ft X 48 ft bed level. in (3)
run of (12) chambers. Backfill the chambers and all voids between with native Sandy Loam (no cobbles) to top of chambers.
TOP SOIL CONSTRUCTION: Back fill over chambers with 12 inches of high organic top soil and reseed to native vegetation. D
not compact top soil!
SEPTIC TANK & PIPE CONSTRUCTION: Install septic tank level with 6" sand gravel bedding. Install the delivery pipe from
the residence to the septic tank 2% slope, Schedule 40 PVC (ASTM D 2665) or SDR 35. Insulate under driveway or any parking area
with 2" rigid insulation. Septic tank to have risers brought to or above final grade and shall have a secure locking mechanism.
ALARM: A visual and audible alarm shall be incorporated into the controls and electrical connections. Alarm to be in an open
area or area easily visible.
NOTES:
1. The building sewer line from the barn to the septic tank shall have a slope of inch per foot (2%). Bends in the building sewer
shall be limited to 45 degrees.
2. Use topsoil for vegetative cover.
3. Assemble and install the Infiltrator Chambers in the trenches according to the manufacturer's recommendations.
4. Avoid vehicle traffic, animal concentrated loads and irrigation over the system. Fencing advised.
5. The Septic System Installation shall be inspected by the Design Engineer prior to backfill. (Pictures not sufficient)
6. All installations shall meet the rules and regulations of the Eagle County Environmental Health Department.
7. Electrical requirements of alarm to be determined by Electrical Contractor prior to construction. In general, all electrical to be
18" below grade.
8. The Bio effluent screen shall be installed at outlet tee and maintained annually or as needed.
9. Pump septic tank every 2-3 years minimum to prevent deterioration of concrete.
10. Installer must be licensed installer in eagle county; see permit.
MINIMUM DIMENSIONS TO FACILITIES
ACTUAL
(MIN. REQ'D)
Profile Holes (2) Textural Classification (New Location)
0.0 to 2.0 ft Topsoil with organics
SEPTIC TANK TO BUILDING
20 FT
(5 FT)
2.0 to 8.0 ft Tan, Sandy Loam
SEPTIC TANK TO WATER LINE
30 FT
(10 FT)
No groundwater.
SEPTIC TANK TO ABSORPTION BED
81 FT
(10 FT)
ABSORPTION BED TO WELL SPRING
(100
PERCOLATION TESTS: Visual and tactile evaluation of the treatment soil indicates Sandy, Silty Loam to Loam with a
ABSORPTION BED TO BUILDING
80 F0 FT
( T)
percolation rate 30 Minutes/inch.
ABSORPTION BED TO WATER LINE
140 FT
(2 F
(25 FT)
ABSORPTION BED TO IRRIGATION
N/A
(50 FT)
INFILTRATOR CHAMBER SYSTEM IN SERIAL TRENCH DISTRIBUTION
ABSORPTION BED TO PROPERTY LINE
0
(10 FT)
Given this information, the new barn would be best served by a chamber system in serial trench distribution.
BUILDING SEWER TO WATER LINE
3F
30 FT
(]0 FT)
Treatment Level 1 Effluent: Per Table 6-3: 10-1
Surface of Soil Treatment Area (STA) shall be based on LTAR of secondary sand and not the percolation rate.
Soil Treatment Area = Design Flow (gals/day)/LTAR gal/day/SF.
Long Term Acceptance Rate (LTAR) is calculated as follows:
• According to Table 10-1, the LTAR is estimated to be 0.5 Gal/day/SF.
• Design Flow = 300 GPD/ 0.5 G/day/sf x (0.7) (Table 10-3) = 420 SF.
• Using Standard Quick 4 Infiltrators; 420 SF/12 sf per Infiltrator = 35 Infiltrators.
• Trench shall be (3) runs of (12) Infiltrators, TOTAL (36).
• Valley Precast 1,000 gallon tank with over flow audible and visual alarm.
• Chamber Product to be Infiltrator Systems, Inc. "Quick 4" Standard Chambers.
SEPTIC TANK: Table 9-1, for a 2 bedroom residential structure, Minimum Tank Capacity is 1,000 gallons in the first 2 chambers,
and meets a minimum 48 hours of retention. Owner decision to install 1,250 tank. Proposed Valley Precast Tank: Inlet side 843
gallons, Outlet 416 gallons. Water tightness per Section 9, ASTM C 1227-12.
INSTALLATION
Install all components to the required setbacks required by regulations. No over excavation allowed for septic tank or trenches.
See 43.7, Table 7-1 for further information and requirements if changes are made to assure proper clearances.
SANDY LOAM
55% SAND
30% SILT
15% CLAY
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DESIGN NOTES
• Design per performance test per ASTM
C1227
• Top surface area 56.25 ft'
• f'c ® 28 days; concrete = 6.000 PSI
Min.
Installation,
• Tank to be set on 5" min. sand
bed or pea gravel
• Tank to be backfilled uniformly on
all sides in lifts less than 24' and
mechanically compacted
• Excavated material may be used for
backfill, provided large stones are
removed
• Excavation should be dewatered and
tank filled with water prior to being
put in service for installation with
water table less than 2' below grade
• Meets C1644-06 for resilient
connectors
• Inlet and Outlet identified above pipe
• Delivered complete with internal piping
• PVC or concrete risers available
• Secondary safety screen available with
PVC riser
• Option of pump or siphon installed
ALLOWABLE BURY
(Based on Water Table)
WATER TABLE
ALLOWABLE
EARTH FILL
0'-0"
2'-0"
1' — 0"
3' — 0"
2'-0"
3'-0"
3'-0'
4'-0"
DRY
4' — 0"
20" Clear Access
• TANK
ID
1,250 Gallon Tank
Top
View
Section
View
Digging Specs
Invert
Dimensions
Net Capacity
Net Weight
13' Long x 7' Wide
Inlet
Outlet
Length
Width
I Height
Inlet Side
Outlet
I Total
Lid
I Tank
I Total
56" below inlet
56"'
53"
135"
60"
68"
843 gal
416 gal
1259 gal
3120 Ibs
10880 Ibs
14000 be
BIO FILTER OUTLET
(CLEAN ANNUALLY -MIN)
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INFILTRATOR SYSTEMS INC.
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