HomeMy WebLinkAboutOWTS Plan 06.26.2023• 1►Z % ;44 1 GENERAL NOTES:
* ~ 1. THE OWTS EXISTING CONDITIONS AS SHOWN ON TNT PLAN WERE OBSERVED AND DRAFTED BY SOPRIS
% ENGINEERING.
• SP-2 2. THE EXISITNG LOTCONDITIONS PER COUNTY GIS DATA BASE, AERIAL MAPPING, LIDAR TOPOGRAPHY BY SOPRIS
• ENGINEERING.
_ 3. PRIMARY OWNER NAME & ADDRESS: Paul & Robyn Whaley
44 40
1776 County Road 241,
New Castle CO 91647
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- * PH: 712 249 2811
�'•y �� EM: "robyn whaley13" <robyn.whaley13@gmail.com>
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26, 2023.,;
4. LEGAL SUMMARY: Tr In E1/4 Of Lot 3 Lying Ely of New Hwris Ditch.
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't S. SITE ADDRESS: 1775 County Road 2411, New Castle CID
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• 6. PARCEL NUMBER: 2123183000011xYx
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2 ^ • 7. EXISTING GARFIELD COUNTY ISDS PERMIT # 1777, ISSUED 5-16-1990 (MAt1r I HOUSE)
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■ , S. NEW GARFIELD COUNTY OWTS PERMIT # SEPT-7985, ISSUED 3-160-2023 (2-EIEDROOMSOML Y-ADU)
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■ k , WHALEY-AS CONSTRUCTED OWTS
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The OWTS installations were constructed to serve a detached guest bedroom suite on the 14 acre rural parcel.
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11r o The existing bedroom suite contains 2 bedrooms, a Y. bath and basin and does not have any kitchen or laundry
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r 5 a GARAGE fixtures. Regulatory usage is considered to be equivalent to additional bedrooms in addition to the existing
r , 3-bedroom residence. Sopris Engineering performed site visits to inspect and document the as -constructed
condVions of the OWTS. Inspections were coordinated with the property owner that had the system
components installed approximately 2 years ago.
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Post Improvement Summary Existing CaJIITS Conditions
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The OWTS utilizes a 1,060-gallon two compartment reinforced plastic septic tank and soil treatment area (STA)
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r • 1 �r The soil treatment unit (STA) consists of 9 Arc-36 leaching chamber trenches that provide 135 S.F. of total
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absorption area. Two additional chamber units were installed on the terminal end a€the existing chamber
7 in April, 2023 Number SEPT-7985. The t@nk is discharged through
10% trench Lmder permit septic effluent gravity a
"'w -i - r ,a.. , 4-inch schedule-4C gravity sewer pipe installed to the head of the first trench chamber. Observation ports
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= with threaded PVC caps are installed on the head, seventh chamber and the new distal end chamber units.
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Regulatory Flow
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• _ The OWTS is regulatory design flaw is 150 gallons per day based on the nxnimum design wastewater flow to
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'+ + serve 1 person per additional bedroom for a single family residential complex that has a total 5 bedrooms.
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Minimum population based on 1 person per bedroom forthe additional 2 bedroom capacity = 2 persons.
Gallons day =75 No factor
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per per person gal/person/day, peaking
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Max. Design flow (QdJgalion s/day = (# of people) x (avg. flow)gal/person/day.
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• r Design flow Qd = 2* 75=150 gpd
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Septic Tank
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�� ► 1 The existing septic tank has adequate capacityfor minimum 48 hour retention time:
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♦+mow s 40 V = 150 gal/day * 2 = 300 gallons. Installed a 1,000 gallon, two compartment reinforced plastic septic tank
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with an inlet sanitary tee and ef'!uent filter outlet sanitary tee in the second chamber. Tank was ,'nstalled with
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ot ofsealed risers and lids to the finish grade surface.
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s� qliiiiiiil Sub Surface Conditions and Observation
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.6 A, � � A site assessment was performed by Sopris Engineering in on October 3, 2022. The onsite sails near and
adjacent to the existing STA were sampled and characterized by application of the USDA visual/tactile soil
texture method analysis from samples obtained in a driveway ebcavation cut and a shallow hand dug
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excavation near the distal end of the trench. The sails below 3-6 inches of topsoil consist of medium dense
loamy sand texture soil with slightly granular structure to a depth of 3 feet. The soils contain scattered
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s. a gravels and cobbles assumed to be less than 3.0% in the loamy sand to sandy loam soil matrix. The native
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- '+ sandy soils in the immediate area appear to be well drained. Seasonal high C-zoundwater levels are expected
to be below 20 feet from the existing surface grades on the moderately slope terrain.
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' 4! ■ . { r ,� �� �•- r The native soils sampled at 3 feet below the surface grades, ki the vicinity, are characterized as a soil type 1
4 consisting of loamy sand texture with slightly granular structure. This soil is assumed to have an effective
loading rate for conventional soil treatment of 0.8 Gal/S.F./day for a level 1 conventional treatment system.
f • ' ' 4 The equivalent percolation rate is assumed to be 5-15 minutes per inch. The soils observed appear to be
'y, fdwr' • suitable forthe conventional shallow absorption field consisting of gravelless infiltration chamber units.
= - Septic tank & Treatment -Soil Treatment Area Existing Conditions
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< < • # The existing treatment system and absorption field consists of gravity distribution of septic tank effluent to a
- y r ■ single chamber trench with treatment across the native soil absorptive surface. The STA trench was installed
i -_ to a maximum depth at the absorptive surface approximately 36 inches from pre -construction existing surface
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' _ + grades and back with 6 to I2-inches of final grading subgrade soils and imported gravel over the trench
/ placed to allow positive drainage off the finish grave surface. The trench area is protected from vehicularab
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f traffic by a line of placed embedded boulders installed in a northwesterly line adjacent to the tank and trench
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` to the existing corr:ours.
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STA Sizing Long Term Acceptance Rate (LTAR)
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R �� r Receiving Wastewater Treatment Level 1; Soil type 1 loading rate for a loamy sand is (0.8 gal./S.F./day).;
STING RESIDENCE
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t _ ti ti Loading factors; (Table 10-2, Gravity application trenches =1.0 ) and
- � ' ! (Table 10-3, gravelless chambers = 0.7)
EXISTING POND -
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W/ IMPERVIOUS LINER A(sf) = Cid x L.F.1 x L.F.2 .: A= Area;
. LTAR LTAR = 0.8 Gal/S.F./day for loamy sand
r _ _ • 010, 0 ue- Qd = flow (gal/day) = 150 gpd
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1 = . L.F.2=0.7 Chambers
• A(sfj=150
_ - gpd x1.0x0.7=131.5S.F.
: GRAPHIC SCALE 0.8Ga1/5.F./day
• 20 0 10 20 0 80 �41f� �.. Number of Arc-36 chambers 5'x3'x12"chambers:
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13123 S.F. = 8.75 chambers; Minimum 9 Arc-36 chamers required.
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15 S.F./Chamber
( IN FEET j � � t + � Original trench had 7 chambers, 35 L.F. absorption area by 3 feet wide = 105 S.F.
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incur - 20 'Ft. i '� � � • ' ■ Two additional chamber were installed for a total soil treatment area of 135 S.F.
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The original 7 Arc-36 chambers and two additional chambers were installed sn a single trench 45' long by 3'
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- 'I ''f i '-' wide. Based on reported average water usage in the structure of 25 gpd and the limited occupancy of the
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8 - _ ? _ - „ rd3+4T, Si .le:r '� KLeIN i�f�j <+" bedrooms the effective absorptive area of 135 S.F. provides adequate treatment for actual usage.
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- ::. { • �� `, ,. Ownership of the system and responsibility for maintenance and repair remains with the property Owner.
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-__ L� • _ " . . • r x F.,- The Owner is encouraged to retain the services of qualified personnel to inspect the OWLS and to perform all
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` t a-eo1211:iIUR836 = 1 y�'' r .� maintenance, repairs and any future upgrades as necessary to ensure that the system components are
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8 ; i , °a e n o' • �. S _ SHAW,�S • = aL.LY'.4 r 27251370[i035 rr�-'4�4 ^ '-. mairtained in good operating condition. The components of the OWTS system should be inspected and
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._ fi s.;��'� +C^ maintained bi-annually. The tank, absorption field and other system components should be visually inspected
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4, r - - " ,`: >r' ' five ears. The effluent filter should be cleaned eve six months and at the time of um In Positive surface
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DATE: fl6-25-23
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PREVIOUS SURVEY PLAT. SITE FEATURE GIS AERIAL MAP
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SHEET C1