HomeMy WebLinkAboutSystem Design Drawing 09.09.2020/
EXISTING OWTS PREVIOUS ISDS PERMIT NO. 1725 r W
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The existing OWTS was permitted for a 1 bedroom single family residence
based on minimum standards at the time of permit, being based on a a - t�r'EF.d' s Ul n ,' ` * ''' .w,f2 - -i
percolation rate of 24 minutes per inch requiring 353 square feet of -.�+Li ., ;11.A.o.",
absorption area per bedroom that is equivalent to 118 lineal feet of SB2 pipe „ s7 19�71
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treatment/absorption laterals. The State approval of SB2 tubing allowed for an 1" N T s -RI HARD D rl�i'vF/ '
equivalency of 1 L.F. of SB2 pipe being equivalent to 3 S.F. of a 3' wide pipe ! y YF#�4fl
and gravel absorption trench. ' a .4. Y '
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idicatin that a total of
The permit was finalized on 12-5-89 by Don Owens Picketing
140 lineal feet of SB2 treatment/absorption pipe was installed. Therefore the
capacity at the time of permit would be 140 L.F. SB2 (3 SF/1 LF) = 420 gpd
5 bedrooms.
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420 gpd could serve a population of people or 2.5
A Copland, 1000 gallon, two -compartment concrete bank was installed with
concrete access riser and lids on the access openings. A cleanout was
installed between the tank and the residence. a;
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Existing System Inspection Summary fr Fti �.6,T
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DESIGNED BY l
DRAWN BY
CHECKED BY
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The existing owts as shown and noted on the plan was inspected, tv evaluated �f
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and located by Sopris Engineering on August 26, 2020 in coordination with z '�
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Down Valley Septic. The approximate location and condition of the sewer pipes, Y ' . -• _ 4 " _� _: • ,' :. r±'
SB2 tubing was determined by tv probe and observation.
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The Tank has been previously pumped in December of 2019.
Depth of Scum and sludge levels were 1" to 3" and 2" to 6" respectively.
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No evidence of high water in the tank or riser was observed. The TV inspection t„
indicated continuity and generally good conditions of the raw sewage influent _i
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pipe to the tank from the house and the effluent pipe from the tank to the '' F3' ` ' -"•
SB3 field. Normal staining was apparent along the 20% pipe capacity flow line. ��n ai i .la ET'r Ir.:., h `�L ., s - -.; l' I s: r- EL jPLIS -DE I
LEXT D'r SEALEDR.-'SAND LIr AT2"+,r:u.
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the bends along the effluent pipe and transition 4" X 6' reducer fitting at the -�. �,•;.
S82 pipe were found intact and in good shape. Na excessive sludge was• g%i
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encountered in the SB2 piping explored. No evidence of high water staining or �"�' ''"� �l - l
ponding was observed. The system appeared to be in adequate conditon for %€a_��
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continued use based on current usage and design capacity. A 30 gallon
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water flush test indicated normal effective drainage operation.
VINCINITY
MAP
INSTALL 4"PV EWER P•E@2%,
U. SCHD-• o R SDR-3S
Proposed Site Improvements
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The proposed detached 25' x 40' garage facility will Include a small bathroom
GENERAL NOTES:—
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EXISTING r�GE
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ACCESS ��
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1-BE
D LLING
EXISTING 4" PVC
G I UE PIPE
for the exclusive and limited use of the two resident population and therefore
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will not increase usage of the existingsystem. The new 4" gravitywaste pipe 1. THE EXISTING OWTS AS SHOWN AND NOTED ON THE PLAN WAS INSPECTED, TV
from the proposed garage to the existing septic tank will connect via the side
inlet port with new sanitary tee or into exiting influent pipe to be re plumbed EVALUATED AND LOCATED BY SOPRIS ENGINEERING ON AUGUST 26, 2020 IN
COORDINATION WITH DOWN VALLEY SEPTIC. APPROXIMATE LOCATION DETERMINED BY
with full body wyes maintaining existing sanitary tee. N PROBE.
Existing System Recommendations THE PROPOSED
'RIS ENGINEERING, LLC.
CIVIL CONSULTANTS
502 MAIN STREET
CARBONDALE, CO 81623
(970) 704-0311
FAX: (970)-704-0313
1�' 1 IIII� EXI / G 10' GA 2-COM
' 53.0' �—� •"CRETE Pile TANK
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2. LOT CONDITIONS BY SOPRIS ENGINEERING AND OWNERS WITH
It is recommended that certain minor components and additions be installed PROPOSED BUILDING SITUATED BASED ON LIMITED HELD SURVEY OF EXISTING
to upgrade the existing OWTS and insure continued normal operation, ease of DRIVEWAY AND GRAVEL ACCESS ROAD.
Inspection, monitoring and maintenance.
ROPO 25' X 40' RAGE ®` : TAI S
.. / S ON GRADE
BUILDING P.'MIT NO.
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PLANTER.The
3. THE EXISITNG LOT CONDITIONS PER COUNTY GIS DATA BASE, AERIAL MAPPING,
LIDAR TOPOGRAPHY AND SURVEY IN6"ORMA710N BY HIGH COUNTRY ENGINEERING.
An effluent filter should be installed on the septic tonk's second compartment
effuent outlet sanitary tee, 4. PRIMARY OWNER NAME & ADDRESS: MICHAEL & SUSAN THOMPSON FAMILY TRUST
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existing concrete Tank risers should be removed, cleaned and reset on the 477 COUNTY ROAD 112
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tank lids with fitted riser extentions to bring the lids approximately 2-3 inches CARBONDALE, CO 81623
above the surface grades. The risers need to be reset, extended and sealing
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with appropriate product and materials. 5. LEGAL SUMMARY: PARCEL 82 BEARWALD EXCEPTION. T 7N - R 88W A TRACT IN
The distal terminal ends of the SB2 piping should be recovered by careful NWSE SEC 23.
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excavation and equiped with 6' solid inspection ports with lids set a minimum
3" above existing surface grades. 6. SITE ADDRESS: 477 COUNTY ROAD 112, CARBONDALE CO 81623
It is recommended that the above upgrades be installed at the time of
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building construction and that the existing sewer lines be cleaned. The 7, PARCEL NUMBER: 239323400361
EXISTI 4" PVC e'-AVITY
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Engineer should be notified of the work and be engaged to inspect, locate,
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approve and produce an AS -Constructed plan and System conditions letter for 8. PREVIOUS GARFIELD COUNTY ISDS PERMIT #: 1725_ ISSUED11/27/1989
the owner and County updated County Records as needed. CONTRACTOR: K.B. WALTER CONSTRUCTION
Assumed ExistingSystem Treatment Caoacity
16 9. PROPOSED GARAGE FACILITY IMPROVEMENTS:
DATE
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/ / ISD PERMIT 1725, 12/
GARFIELD COUNTY BULDING PERMIT #:BLRE-08-20-6440
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.� / / D IGN ABS."'TION AREA 2
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The minimum residential treatment capacity for a residence would currently be CONTRACTOR: TALLY HO CONSTRUCTION.
based on an equivalent 2-bedroom home utilizing the LTAR and the minimum
population based on 2 bedrooms = 4 persons.
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ISTING Dr -WAY rr / POTEN •L OWION EN OPE
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
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Pursuant to observations on site and review of the ISDS file record the native
UPDATED IMPROVEMENT SURVEY PARCEL B2 BEARWALD EXEMPTION
RECOMME CATION:
soils from 2-3 feet below the surface are assumed to be characterized as a
\ / / INSTALL INIMUM 4' •CTION Pfi•T AT
/ EACH E OR TREA T ABSORPTON P `E LA '-L (TYP.)
soil type 2 consisting of silt loom texture with granular structure with some
varible rock content. This soil hos an effective loading rate for conventional
ACCORDING TO THE 2ND AMENDED REARM/LLD MI/PITON PLAT RECORDED AS RECEPTION NO. 465154,
COUNTY OFGARFIELD, STATE OF COLORADO
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soil treatment of 0.6 Gal/S.F./day fora level 1 conventional treatment system.
The equivalent percolation rate is assumed to be 15-25 minutes per inch. No
free water is expected to be encountered in excavations on site. Seasonal high
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Groundwater levels are expected to be below 100 feet from the existing
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REVISION
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surface grades. The soils should be suitable for a shallow conventional shallow
absorption field if a future replacement or upgrade is needed.
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Treatment -Soil Treatment Unit/ Absorption System Capacity
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Long Term Acceptance Rate (LTAR)
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Receiving Wastewater Treatment Level 1; Soil type 2 loading rate for a silt
loam is (0.6 gal./S.F./day).;
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Loading factors; (Table 10-2, Gravity application trenches = 1.0 ) and
(Table 10-3, Enhanced manufactured media = 0.7)
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(IN FEET
I. inch = oft. /
A(sf) = : A = Area;
LTAR LTAR = 0.6 Gal/S.F./day for silt loam soil
Qd = flow (gal/day) = 450 gpd
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LF.1=1.0 Gravity Distribution
LF.2=0.7 Enhanced manufactured media
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A(sf) = 300 god x 1,0 x 0.7 = 350 S.F. equivalent absorption area required.
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0.6 Gol/S.F./day
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THOMPSON RESIDENCE
477 COUNTY ROAD 112, CARBC
GARFIELD COUNTY, COLORAL
SITE PLAN AND EXISTING OWTS SYSTEI•
BUILDING PERMIT SUPPLEMENTAL SUPPOR
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cti i / , F'�`IGN 1B_Qflifi'�1F3 A+'.A is/ S.F /,
.�,, � / E TING OWTS/ iv .0P1-%
_ jP.t. ,9':11 WAl' / rI +•-'P(3i' vF> L /^WTS UPGRF `/EXPANSION EN + OPE
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DATE: SEPT 9, 2020
AERIAL EXISTING CONDITIONS
JOB NO. 30141.01
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