HomeMy WebLinkAboutOWTS Design PlanGENERAL NOTES:
1. THE REPLACEMENT OWTS AS SHOWN ON THE PLAN AND THE DETAILS WERE DESIGNED
BYSOPRIS ENGINEERING,
2. THE PROP05ED LOT CONDITIONS BY SOPRIS ENGINEERING AND OWNERS.
DOSING BASIN (180 GALLON CAPACITY). _
EX WELL INSTALLED 30" DIAMETER RIBBED PVC PUMP BASIN W/ FIBER LID, MIN. 4' STORAGE DEPTH
BY 7' TOTAL BASIN HEIGHT W/ INLET SANITARY TEE. _
INSTALLED SIMPLEX30 GPM EFFLUENT PUMP ASSEMBLY (P300511 PUMP-50 GPM), W/1.5" =
-- X - --- x _ X _ DISCHARGE. PUMP IS INSTALLED IN A HIGHHEAD PUMP FLOW INDUCER (UFI) ASSEMBLY
X X ` X _ - x W/ FLOATTREE, BRACKET& MOUNTING FLANGE W/ THE SPECIFIED P300511 PUMP. _
PROPERTY LINE P� X - _ _ x
- WIRE :-
�{ � jl � FENCE , - - -- ' . - - --: •- _ _
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INSTALLED OWTS PUMP CONTROL BOX
POST MOUNTED PUMP CONTROL BOX IN LINE OF SITE WITH TANK . 1.5" SCHD-40 TRANSPORT PIPE W/ 1.S' MIN. DEPTH 1.5" PVC DISTRIBUTION MANIFOLD (TYP.j . =
OF BURY.. INSTALL AT MI N. 2.5% FOR DRAINBACK - --
1.5" SCHD-40 DISTRIBUTION MANIFOLD PIPE INSTALLED WITH TEE & END ELBOW
r I FITTINGS CONNECTED TO PERFORATED DISTRIBUTION LATERALS
FTn P -2 13 4 r' l INSTALLED'PIE20METER INSPECTION POR TAT EACH CORNER OFTHE FIELD
4" SCHD-40 PVC SEWER PIPE @ 2%, (TYP.) 4" PERFORATED PIPE INSTALLED VERTICALLY FROM SURFACE THROUGH
g p THE INFILTRATIVEDEPTH TO THE BOTTOM OF SAND LAYER.
INSTALL NEW 24" DIA. 30" DEPTH RIBBED PVC RISER W/ BOLT DOWN I GEO-MAT ABSORPTION/TREATMENT FIELD
FLANGE KIT & LID a o b INSTALLED 612.5 SF OF GEOMATRIX SYSTEMS HORIZONTAL GEOMAT 3900
INSTALLED NEW EFFLUENT FILTER SANITARY TEE ASSEMBLY ON TANK PRODUCT IN TWO BEDS. EACH BED INSTALLED WITH 4 ROWS OF 39" WIDE BY
OUTLET WITH HANDLE ACCESSIBLE IN RISER BELOW AT SURFACE LID 23.5' FEET LONG GEOMAT MATERIAL OVER 6" DEPTH OF FILTER SAND 23.7' FEET
[-. L i - L_ I LONG BY A 13' WIDE. THE SYSTEM IS PLUMBED FOR EQUAL PRESSURE
EXISITING 1,500-GALLON NORWESCO PLASTIC SEPTIC TANK I DISTRIBUTION THROUGH THE 8 CUSTOM PERFORATED DISTRIBUTION LATERALS.
23.7' 1
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Finished Grade
Recommended Cover Depth is 12", 6" Minimum
1" or 12'" 5ch. 40 PVC Distribution Pipe
Specified Orifice Holes
Fabri GeoGuard Orifice Shield
Native Soil and/or
GeoMat Core Specified Fill
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GEOMAT LEACHING SYSTEM
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IMPROVEMENT LOCATION CERTIFICATE
_ots 5, 6, 7 ❑nd
8, Block 13
Townsite • of
Copperton
County of Garfield,
State of Colorado
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Surveying Services
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1001 Grand Avenue
Suite #205
Prepared Fore SCALE: 1"-30
Ciianwood Springs.
Do.id Le -son pWG NO-: 99033
Colorado, 81605
970 925-82�53 I
Alpine 90nk PROJECT: 99433
PREVIOUS
SURVEY PLAN'
OWTS DEMAND DOSING CALCULATIONS
CYCLE, VOLUME AND PUMP FLOAT
DESIGN FLOW C?
525.00
GPD
ADJUSTMENT FACTOR
0.50
METERED OR ASSUMED CQ
262.50
GPD
TARGET DOSING CYCLES/DAY
6.00
DOSLS/D
DOSE VOLUME /CYCLE
43.75
GAL
DISTRIBUTION LATERAL PIPES VOL
19.65
GAL
DOSE VOL/ LATERAL PIPES VOL
2.23
TIMES
TRANSPORT PIPE VOLUME
1.56
GAL
SUM TOTAL DOSE VOL/CYCLE
45.31
GAL
MIN. DOSING BASIN STAGEVOL
3.06
GAL/IN
ON/OFF FLOAT SPREAD SETTING
14.81
IN
DESIGN PUMP DISCHARGE RATE
37.00
GPM
PUMP RUNTIME
1.22
MIN
FLOW RATE PER ORIFICE
0.43
GPM
GAL/ORIFICE/DOSE
0.53
GAL
DOSIGN CALCULATIONS
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3. THE EXISTTNG LOT CONDITIONS PER COUNTY GIS DATA BASE, AERIAL MAPPING, LIDAR
TOPOGRAPHY, EXISTING 5UBDfV1SION PLATAND OWNER PROVfDED 5KETCHES.
4. OWNER NAME & ADDRESS: HAINES, STEVEN G & BAILEY A
18 PINE STREET,
CARBONDALE CO 81623.
S. LEGAL SUMMARY: Section: 28 Township: 7 Range: 88 Subdivision: COOPERTON
TWNSTE.
Block: 13 Lot: 5 AMENDED LOTS 5-9, BILK 13 PER PLAT REC4717128
15750 SQUARE FEET
6. SITE ADDRESS: 41 PINE ST , CARBONDALE, CO 81623
7. Parcel Number: 239328313016
S. EXISTING GARFIELD COUNTY BUILDING PERMIT# 59611, i55UED 11/04/98
9. NEW GARFIELD COUNTY PERMIT M _SEPT-6929, ACCEPTANCE 08-03-21
10. CONTRACTOR: OWNER CONSTRUCTED
GENERAL OWS CONDI
Existing OWTS Components
The previous OWTS system served the existing residential dwelling that currently has four bedrooms. The
OWTS components consisted of gravity service pipes, a 1,500-gallon Norwesco plastic septic tank, that
discharged effluent to a 741 S.F. chamber bed field consisting of 8 chamber rows approximately 3 V long by
24'. The effluent was gravity discharged to a buried plastic distribution box with (4) 4" effluent distribution
pipes each connected to a manifold pipe that connected to 1 of the 4 pairs of chamber rows. The existing
chamber bed was installed deep with the top of chambers over S feet below the existing surface grades.
The bed was partially backfilfed and abandoned in place to install the new proposed shallow OWTS Geomat
beds in and around the the general vicinity. The absorption field was installed in 1998, under County building
permit no. 6961.
Proposed OWTS System Replacement
The OWTS will maintain the gravity service pipe from the existing dwelling to the existing 1,500-gal concrete
2-compartment plastic septic tank. The replacement system will indude the installation of a new 30" ribbed PVC
riser Pump basin in series with the primary tank that provides for a minimum 45 gallon dosing volume and
minimum 150 gallon storage volume. The dosing basin is equipped with an Orenco System simplex highhead
effluent pump assembly for pressure distribution to the Geotextile Sand filter (GSF) bed's custom perforated
distribution laterals. The pump is installed in a highhead pump flow inducer (UFI) assembly w/ float tree,
bracket & mounting flange w/ the specified P300511 pump-Tha effluent discharge piping is installed to
connect to a common manifold pipe that connects to the custom perforated distribution laterals at the head of
the Geomat treatmentlabsorption beats.
OM UPGRADE DESIGN t,ALCUTA770M
The existing residential structure has 4 bedrooms. The total peak residential population is 7 persons.
From County adopted State Regulation 43, Design Flow Criteria: Minimum population is based on 2 persons
per bedroom for the first 3 bedrooms = 6 persons and 1 person per bedroom for each additional bedroom.
Therefore. design population is 3 bedrooms x 2 persons + 1 bedroom x 1 person = 7 persons total.
Gallons per day per person =75 gal/person/day, No peaking factor
Design capacity = Max. Design flaw (Qd)gallons/day = f4 of people) x (avg. ffow)gal/person/day.
Design flow Qd = 7+ 75 = 525 gpd
Septic Tank Design. 2-Day detention time = 525 x 2 = 1,050 gallons required.
Continue use of the existing 1,500 gallon plastic two -compartment primary septic tank and install in series
a minimum 300 gallon dosing pump tank or minimum 150 gallon pump basin with a bio-tube simplex high
head pump dosing assembly.
Sub Surface Conditions and Testing
A subsurface soil investigation and site assessment was performed by Sopris Engineering in on June 10,
2021. 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 a 7 foot deep profile pits and 5 foot deep
excavations exposing the tank, effluent pipe and buried distribution box. The shallow soils in these
excavations were sampled, observed and tested at 2, 3 and 6 foot depths.
The soils below nil to 4 inches of topsoil consist of medium dense sandy silt foam texture soil with slightly
blocky to granular structure to a depth of 7 feet. The soil profile contains less than 20% scattered gravel or
rock content to the 6-feet depth below the surface grades. The soils appear to be consistent across the site
from observations in the excavations. No free water was encountered in the pit excavations. 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 vincinity of the proposed field, are
characterized as a soil type 2 consisting of sift loam texture with granular structure. This soil has an
effective loading rate for conventional soff treatment of 0.6 Gal/5.F./day fora level 1 conventional
treatment system. The equivalent percolation rate is assumed to be 20-30 minutes per inch. In order to
provide optimal treatment in the limited available area, a pressure dosed STA utilizing enhanced
manufactured media will be installed to provide for an enhanced treatment level TL-1 system. No free
water is expected to be encountered within the field excavations. Normal Groundwater levels are expected
to be below 10 feet from the existing surface grades.
GeoMat"° Treatment Unit/ Absorption System Design
The treatment/absorption fields are designed based on utilizing the effective Long Term Acceptance Rate
(LTAR) for a geotextile sand filter (GSF) treatment system utilizing pressure dosed distribution laterals. The
new treatment systems will consist of pressure dosed GeoMat sand filter treatment beds with 6-inches of
washed filter sand (ASTM-C33, "Concrete sand") below 4 rows of 39-inch wide GeoMat model 3900
manufactured treatment/distribution media, in accordance with Regulation 42 sections (43.10fC),
43.13.E.1.d, Table 10-2 and Table 10-3 as approved by CDPHE for this technology.
Long Term Acceptance Rate (LTAR)
Considering the allowable application of the OWTS regulation 43 and COPHE approved proprietary
Distribution Product for Geomatrix Systems, GeoMat product:
Receiving septic tank effluent, the treatment level-1 for GeoMat requires a minimum 6" depth of filter sand
media with the bottom of the sand layer defined as the infiltrative surface being at least 4-feet above a
limiting Layer (43.8, Table 7-2.4); Maximum hydraulic loading rate for TL1 effluent is the long term
acceptance rate of the receiving soil Type 2 is 0.6gal./S.F./day) (Table 10-1 &10-1A.).
Atsf) = Qd x i r 1 v i F 2' A= Area
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LTAR LTAR = 0.6 gaf/&F./day for silt loam
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Qd = flow (gal/day) for OWTS = 525 gpd
L.F.1=1.0 pressure dosed bed application
L.F.2=0.7 Enhanced Manufactured Media
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OWTS: A(sf) = 525 gpd x 1.0 x 0.7 = 612.5 S.F.
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Excavated two beds 18- depth below finish grade. Scarified surface and installed the specified length of
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GeoMat rows with the specified custom perforated distribution laterals and manufacturer supplied orifice
below GeoMat distribution laterals installed
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shields the specified orifices on top of the material, The per
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manufacturers recommendations below the top geofabric cover. Backfilled the completed geo mat beds
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with suitable excavated materials to -finish top of bed grade slightly mounded approximately 4 inches above
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the surrounding surface grades,
field feet long by feet dosed fitter beds
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The treatment consist of two 24 13 wide pressure Geomat sand
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each with of square of absorption area with custom perforated pressure
distribution laterals bed. The 612.S S.F. treatment field installed total 8 dose
per was with a of pressure
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distribution laterals equally pressured dosed by the high head pump assembly in the dosing basin, to a
1.5" lateral beds. Each bed
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common manifold pipe connected to each running the width of the two was
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constructed with 6-inches of washed filter sand below 4 rows of 39-inch wide GeoMat model 3900
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manufactured treatment distribution media. The dosing um assembly was installed in the um basin
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the septic tank and the field to provide for equal pressure distribution of effluent across each
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treatment/absorption bed. The septic tank effluent is dosed through each individual 1.5" custom perforated
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pressure distribution lateral running the length of each bed centered on each 39" GeoMat material row.
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DATE: 11-24-2021
JOB NO. 31132.01
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