HomeMy WebLinkAbout30 Vaquero Rd - 239128405001INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT
EAGLE COUNTY DEPARTMENT OF ENVIRONMENTAL HEALTH
P.O. Box 179 - 550 Broadway • Eagle, Colorado 81631
Telephone: 328-7311 or 949-5257 or 927-3823
YELLOW COPY OF PERMIT MUST BE POSTED AT INSTALLATION SITE. PERMIT NO. 1041
Please call for final inspection before covering any portion of installed system.
OWNER: Stan & Yvonne Hall PHONE: 927-4540
MAILING ADDRESS: 515 Holland Hills Rd, Basalt, CO 81621
AGENT: PHONE:
SYSTEM LOCATION: H.C.C. Subdivision Lot A, 0030 Vacquera - Carbondale
LICENSED INSTALLER: Stan Hall 30-91 LICENSE NO.
DESIGN ENGINEER OF SYSTEM:
INSTALLATION IS HEREBY GRANTED FOR THE FOLLOWING:
1000
GALLON SEPTIC TANK OR GALLON AERATED TREATMENT UNIT.
DISPERSAL AREA REQUIREMENTS:
SQUARE FEET OF SEEPAGE BED 523 SQUARE FEET OF TRENCH BOTTOM.
SPECIAL REQUIREMENTS: 180' of 10" SB2 R/17 infiltrators
Place leach field in the area of perc test holes 2 & 3, avoid
area
ooffj hole # 1
ENVIRONMENTAL HEALTH OFFICER: v ` DATE:...
CONDITIONS:
1. ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM
REGULATIONS, ADOPTED PURSUANT TO AUTHORITY GRANTED /N 25-10.104, C.R.S. 1973, AS AMENDED.
2. THIS PERMIT IS VALID ONLY FOR CONNECTION TO STRUCTURES WHICH HAVE FULLY COMPLIED WITH COUNTY ZONING AND
BUILDING REQUIREMENTS. CONNECTION TO OR USE WITH ANY DWELLING OR STRUCTURE NOT APPROVED BY THE ZONING AND
BUILDING DEPARTMENTS SHALL AUTOMATICALLY BE A VIOLATION OF A REQUIREMENT OF THE PERMIT AND CAUSE FOR BOTH
LEGAL ACTION AND REVOCATION OF THE PERMIT.
3. SECTION 1/1, 3.21 REQUIRES ANY PERSON WHO CONSTRUCTS, ALTERS OR INSTALLS AN INDIVIDUAL SEWAGE DISPOSAL SYSTEM
TO BE LICENSED ACCORDING TO THE REGULATIONS.
FINAL APPROVAL OF SYSTEM: (TO BE COMPLETED BY INSPECTOR):
NO SYSTEM SHALL BE DEEMED TO BE IN COMLIANCE WITH THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM REGULATIONS UNTIL THE SYSTEM IS APPROVED
PRIOR TO COVERING ANY PORTION OF THE SYSTEM. �p
INSTALLED ABSORPTION OR DISPERSAL AREA: 540 SQUARE FEET.0(c`0' /.SB.Z pie.
INSTALLED SEPTICTANK: 000 GALLONS 350 DEGREES23W.E-T Tt*- N. ae'_.4 POS/
SEPTIC TANK CLEANOUT TO WITHIN 8" OF FINAL GRADE, OR:
PROPER MATERIALSAND ASSEMBLY \� YES NO
COMPLIANCE WITH COUNTY/STATE REGULATION REQUIREMENTS: V YES NO
ANY ITEM CHECKED NO REQUIRES CORRECTION BEFORE FINAL APPROVAL OF SYSTEM IS MADE. ARRANGE A RE -INSPECTION WHEN WORK IS COMPLETED.
COMMENTS:
Af
ENVIRONMENTAL HEALTH OFFICER: DATE: / !
1000,
ENVIRONMENTAL HEALTH OFFICER: DATE:
(RE -INSPECTION IF NECESSARY)
RETAIN WITH RECEIPT RECORDS PERMIT
APPLICANT/AGENT:
OWNER:
AMOUNT PAID:— RECEIPT"#: CHECK M CASHIER:
ISDS Permit # �C�V/
j
Building Permit #
APPLICATION FOR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT
ENVIRONMENTAL HEALTH OFFICE- EAGLE COUNTY
P.O. BOX 179
EAGLE, CO 81631
328-8730/927-3823(Basalt)
PERMIT APPLICATION FEE $150.00 PERCOLATION TEST FEE $125.00
PROPERTY OWNER: c
MAILING ADDRESS:vv,�N �A
PHONE. � �--
APPLICANT/CONTACT PERS& K)co* s tL9A PHONE:
LICENSED SYSTEMS CONTRACTOR:
ADDRESS: c;
PERMIT APPLICATION IS FOR:
LOCATION OF PROPOSED INDII
Legal Description:
Parcel Number
Physical Address.
PHONE:
NEW INSTALLATION ( ) ALTERATION ( ) REPAIR
SEWAGE DISPOSAL,SYSTEM:
L �► 51 GYM - A
Lot size:
BUILDING TYPE: - (Check applicable category)
Residential / Single Family Number of Bedrooms 3
( ) Residential / Multi -Family* Number of Bedrooms
( ) Commercial / Industrial* Type
HOT TUB _ .. Yes ( ) _. No
WATER CONSERVATION PLAN: Yes ( ) No (�
TYPE OF WATER SUPPLY: Well'�,-+ Spring ( ) Surface ( )
Public ( ) Name of Supplier:
Give depth of all wells within 200 feet of system:' �'
*These systems require design by a Registered Professional Engineer
NOTE: SITE PLAN MUST BE ATTACHED TO APPLICATION
MAKE ALL REMI CE PAYABLE TO: "EAGLE C UNTY TREASURER"
SIGNATURE: DATE:
LI -S-- q
AMOUNT PAID •
•� p�" / v RECEIPT# � � � / DATE
CHECK # CASHIER:
TIME LOG
Travel Perc Final
cOMMUM-n D[UtL,rnIr'\T
PFPAI:T,1iC\T
EAGLE COUNTY, COLORADO
October 1. 1991
Stan & Yvonne Hall
515 Holland Rd
Basalt, CO 81621
RE: Final of ISDS Permit No. 1041
Dear Mr. and Mrs. Hall:
;oo RROAPIVAl
This letter is to inform you that the above referenced ISDS
Permit has been inspected and finalized. Enclosed is a copy to
retain for your records. Also enclosed are informational sheets
regarding the care of your septic system.
If you have any questions regarding this permit, please contact
the Eagle County Environmental Health Division, P.O. Box 179,
Eagle, Colorado 81631. We can also be reached, depending on your
calling area, at the following numbers: Eagle Valley 328-8730;
Basalt/El Jebel 927-3823.
Sincerely,
C. Kelley Carhart
Office Assistant
c lac
Encl:
cc:
Information Sheets
Final. ISDS Permit
Chrono File
Building Permit File
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TYPE OF DWELLING:NUMBER OF BEDROOMS 3
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\-PERC RATE: use /S MP-r MINIMUM SEPTIC TANK SIZE:
MINIMUM LEACH FIELD SIZE: 5,Q 47 /�Q �df 10- 5$20� l7 rs
COMMENTS:
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PERC TEST DONE BY:
DATE:
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MISC. COSTS
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INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT
EAGLE COUNTY ENVIRONMENTAL HEALTH DEPARTMENT
Telephone:(970)328-8755
P.O.Box 179 -500 Broadway,Eagle,CO 81631
COPY OF PERMIT MUST BE POSTED AT INSTALLATION SITE.
PERMIT#IS-2589-07 BUILDING PERMIT#18172
OWNER:LOURIE ALBANESE PHONE:561-573-8665
MAILING ADDRESS:508H SWINTON AVE.DEL RAY BEACH FL.33444
APPLICANT:SAA PHONE:
SYSTEM LOCATION:30 VAQUERO ROAD TAX PARCEL NO.239128405001
LICENSED INSTALLER:LICENSE NO.PHONE:
DESIGN ENGINEER:PHONE:
SYSTEM SIZED TO ACCOMODATE AN ADDITION OF 2 BEDROOMS FOR A TOTAL OF BEDROOM RESIDENCE:
INSTALLATION GRANTED FOR THE FOLLOWING: GALLON TANK, SQUARE FEET OF ABSORPTION AREA
CREDIT VIA
SPECIAL INSTRUCTIONS:
●DO NOT INSTALL IN WET WEATHER.
●CALL EAGLE COUNTY AND THE DESIGN ENGINEER FOR FINAL INSPECTION PRIOR TO BACK-FILLING ANY
PORTION OF THE INSTALLATION OR WITH ANY QUESTIONS.
●THE BUILDING TCO AND CO WILL NOT BE ISSUED UNTIL THE SEPTIC SYSTEM HAS BEEN INSPECTED AND
APPROVED
ENVIRONMENTAL HEALTH APPROVAL: DATE:
CONDITIONS:
1.ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM
REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN 25-10-104,1973,AS AMENDED.
2.THIS PERMIT IS VALID ONLY FOR CONNECTION TO STRUCTURES WHICH HAVE FULLY COMPLIED WITH COUNTY ZONING AND
BUILDING REQUIREMENTS.CONNECTION TO,OR USE WITH ANY DWELLING OR STRUCTURE NOT APPROVED BY THE ZONING AND
BUILDING DEPARTMENTS SHALL AUTOMATICALLY BE A VIOLATION OF A REQUIREMENT OF THE PERMIT,AND WILL RESULT IN
BOTH LEGAL ACTION AND REVOCATION OF THE PERMIT.
3.CHAPTER IV,SECTION 4.03.29 REQUIRES ANY PERSON WHO CONSTRUCTS,ALTERS OR INSTALLS AN INDIVIDUAL SEWAGE DISPOSAL
SYSTEM TO BE LICENSED.
FINAL APPROVAL OF SYSTEM (TO BE COMPLETED BY INSPECTOR):
NO SYSTEM SHALL BE DEEMED TO BE IN COMPLIANCE WITH THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM REGULATIONS
UNTIL THE SYSTEM IS APPROVED PRIOR TO COVERING ANY PORTION OF THE SYSTEM.
INSTALLED ABSORPTION OR DISPERSAL AREA: SQUARE FEET (VIA )
INSTALLED GALLON SEPTIC TANK LOCATED DEGREES AND FEET INCHES FROM
COMMENTS:
ANY ITEM NOT MEETING REQUIREMENTS WILL BE CORRECTED BEFORE FINAL APPROVAL OF SYSTEM IS MADE.ARRANGE A
RE-INSPECTION WHEN WORK IS COMPLETED.
ENVIRONMENTAL HEALTH APPROVAL: DATE:
INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT
EAGLE COUNTY ENVIRONMENTAL HEALTH DEPARTMENT
Telephone: (970) 328-8755
P.O. Box 179 - 500 Broadway, Eagle, CO 81631
COPY OF PERMIT MUST BE POSTED AT INSTALLATION SITE.
PERMIT# IS-2589-07 BUILDING PERMIT# 18172
OWNER: LOURIE ALBANESE PHONE: 561-573-8665
MAILING ADDRESS: 508H SWINTON AVE. DEL RAY BEACH FL. 33444
APPLICANT: SAA PHONE:
SYSTEM LOCATION: 30 VAQUERO ROAD TAX PARCEL NO. 239128405001
LICENSED INSTALLER: LICENSE NO. PHONE:
DESIGN ENGINEER: PHONE:
SYSTEM SIZED TO ACCOMODATE AN ADDITION OF 2 BEDROOMS FOR A TOTAL OF BEDROOM RESIDENCE:
INSTALLATION GRANTED FOR THE FOLLOWING: GALLON TANK, SQUARE FEET OF ABSORPTION AREA
CREDIT VIA
SPECIAL INSTRUCTIONS:
DO NOT INSTALL IN WET WEATHER.
CALL EAGLE COUNTY AND THE DESIGN ENGINEER FOR FINAL INSPECTION PRIOR TO BACK-FILLING ANY
PORTION OF THE INSTALLATION OR WITH ANY QUESTIONS.
THE BUILDING TCO AND CO WILL NOT BE ISSUED UNTIL THE SEPTIC SYSTEM HAS BEEN INSPECTED AND
APPROVED
ENVIRONMENTAL HEALTH APPROVAL: DATE:
CONDITIONS:
1. ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM
REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN 25-10-104, 1973, AS AMENDED.
2. THIS PERMIT IS VALID ONLY FOR CONNECTION TO STRUCTURES WHICH HAVE FULLY COMPLIED WITH COUNTY ZONING AND
BUILDING REQUIREMENTS. CONNECTION TO, OR USE WITH ANY DWELLING OR STRUCTURE NOT APPROVED BY THE ZONING AND
BUILDING DEPARTMENTS SHALL AUTOMATICALLY BE A VIOLATION OF A REQUIREMENT OF THE PERMIT, AND WILL RESULT IN
BOTH LEGAL ACTION AND REVOCATION OF THE PERMIT.
3. CHAPTER IV, SECTION 4.03.29 REQUIRES ANY PERSON WHO CONSTRUCTS, ALTERS OR INSTALLS AN INDIVIDUAL SEWAGE DISPOSAL
SYSTEM TO BE LICENSED.
FINAL APPROVAL OF SYSTEM (TO BE COMPLETED BY INSPECTOR):
NO SYSTEM SHALL BE DEEMED TO BE IN COMPLIANCE WITH THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM REGULATIONS
UNTIL THE SYSTEM IS APPROVED PRIOR TO COVERING ANY PORTION OF THE SYSTEM.
INSTALLED ABSORPTION OR DISPERSAL AREA: SQUARE FEET ( VIA )
INSTALLED GALLON SEPTIC TANK LOCATED DEGREES AND FEET INCHES FROM
COMMENTS:
ANY ITEM NOT MEETING REQUIREMENTS WILL BE CORRECTED BEFORE FINAL APPROVAL OF SYSTEM IS MADE. ARRANGE A
RE-INSPECTION WHEN WORK IS COMPLETED.
ENVIRONMENTAL HEALTH APPROVAL: DATE:
Today’s date
Mail to the licensed systems contractor (check for current year license)
RE:Issuance of Individual Sewage Disposal System (ISDS)Permit #2589-07,Tax Parcel
#239128405001.Property Location:30 Vaquero Road
Dear Licensed Systems Contractor,
Please find enclosed ISDS permit,number #2589-07to conduct the construction exactly as indicated on the
permit.It remains valid for 120 days or for the duration of a current building permit.The enclosed copy of the
permit must be posted at the installation site.Any changes in plans or specifications must be pre-approved by this
department.If you are receiving this permit and have not been contracted to perform the installation,please contact
us immediately.
Also enclosed is a final inspection completeness check list to assist you in making sure all of the detailed points of
an inspection have been properly addressed before calling for your final inspection.It is important to pay close
attention to the special conditions which may have been included to address site specific issues.All components of
the system must be exposed for our inspection.Projects that require multiple inspections will be assessed a
re-inspection fee of $55.00 payable before or at the time of inspection.It is extremely important to remember to
rake all infiltrative surfaces and avoid installing systems in wet or frozen ground.
In addition to avoiding installations during unfavorable site conditions,please be advised of our annual time frame
for ISDS installations,unless otherwise specifically approved by this department.Permits issued on or before
November 15 must be installed prior to December 1.Spring field activities typically resume around mid March.
Avoiding the winter months promotes better site evaluations,designs and installations resulting in the best private
wastewater system for our customers.If unfavorable conditions prevail between the installation and the final
inspection (such as snow)special precautions must be taken to protect the drain field area from the elements.
Please keep this office informed regarding the progress of your installation so we can provide responsive customer
service when scheduling your final inspection.The Temporary Occupancy Permit (TCO)associated with the
building permit cannot be issued without the septic system being finally inspected.Systems designed by a
registered professional engineer must be inspected and certified by the design engineer as well as Eagle County
Environmental Health.
If you have any questions,please feel free to contact us at (970)328-8755.
Sincerely,
Terri Vroman,Administrative Technician IV
cc:electronic permit folder
electronic chronological file
hard copy permit file
design engineer –if applicable
Enclosures:ISDS Permit #2589-07
Final Inspection Completeness Checklist
Engineer design
From:Laura Fawcett
Sent:Monday,December 03,2007 2:21 PM
To:'LourieA@aol.com'
Cc:Terri Vroman
Subject:RE:(no subject)
Hi Lourie,
I received an email from Paul with the plan,but it was hard to read since it was so small and enlarging it
was difficult since portions of the plan had been scanned. I called Paul and we discussed some issues
over the phone and he told me that a hard copy would be arriving soon. Some additional site work will
most likely need to be completed in the spring,but as I told Paul,if in his expert opinion there was
adequate room to accommodate the system enlargement,we could more forward with releasing the
building permit. I need documentation from Paul on this.
Thank you,
Laura
From:LourieA@aol.com [mailto:LourieA@aol.com]
Sent:Monday,December 03,2007 1:57 PM
To:Laura Fawcett
Subject:(no subject)
Hi Laura,
Re:septic permit #2589-07 30 Vaquero Road,Carbondale CO
Just checking to see if you did receive my septic design from Paul at Sopris Engineering and how long
you estimate it might before it gets reviewied.
and if there are any comments yet?
Thank you,
Lourie Albanese
561-573-8665
Check out AOL Money &Finance's list of the hottest products and top money wasters of 2007.
From:Paul Rutledge [paulr@sopriseng.com]
Sent:Tuesday,December 04,2007 1:25 PM
To:Laura Fawcett
Subject:RE:Albanese OWS expansion design-30-Vasquero road
Yes;there is room to install the expansion system in an appropriate configuration to be determined in the
Spring. Additional site evaluations will be conducted in the spring including soil inspections and system
layout. We will also look at the appropriate tank components and distribution. Thank you for your
response.
Paul
From:Laura Fawcett [mailto:Laura.Fawcett@eaglecounty.us]
Sent:Tuesday,December 04,2007 10:54 AM
To:paulr@sopriseng.com
Cc:LourieA@aol.com
Subject:RE:Albanese OWS expansion design-30-Vasquero road
Hi Paul,
I spoke to Ray at our staff meeting today;he OK�d my releasing the building permit based on the
information you e-mailed earlier,as long as further site work will be completed in the spring and you do
indeed feel that there is adequate area to accommodate whatever expansion you deem necessary.
Please confirm this in an e-mail response for the record.
Thank you,
Laura Fawcett
From:Paul Rutledge [mailto:paulr@sopriseng.com]
Sent:Wednesday,November 21,2007 12:16 PM
To:Laura Fawcett
Subject:Albanese OWS expansion design-30-Vasquero road
Attached is draft plan and report for the OWS expansion for your review and comment. Thank you for the
input.
November 21, 2007
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
S OPRIS E NGINEERING • LLC civil consultants
Lourie Albanese
30 Vaquero Road.
Carbondale, CO 81623
RE: DRAFT_Addition/Upgrade Onsite Wastewater System, Albanese Residence, Lot A, Cook Minor
Subdivision, 30 Vaquero Rd. Eagle County, CO
SE Job No. 27228.01
Dear Lourie:
Pursuant to your request, attached is a letter/report presenting our findings in regard to a proposed upgrade and
expansion to your Existing Onsite Wastewater System (OWS) at the above referenced Site. The expansion of
treatment capacity is necessary to adequately handle the wastewater design flow resulting from your proposed
residential improvements. It is our understanding that you have applied for a building permit to construct an addition
that will include up to 3 new bedrooms. The existing OWS was permitted and installed for the existing 3 bedroom
residence in 1991. Our understanding the existing facilities are based on information provided by your and from
county records with regard to the as built conditions and capacity of the system. The letter provides a preliminary
design for expansion of the system based on our understanding of the site conditions and the previous design
criteria. We have reviewed previous percolation test information; site information forwarded to us by the owner,
calculated the theoretical OWS capacity for the existing absorption facility and designed reasonable OWS expansion
components as part of our scope of work.
Existing OWS Conditions
Based on our findings and the reporting of others we believe that the existing OWS system is feasible for continued
use. The system appears to be functioning based on Inspection of the tank, and lack of any evidence or reports of
backups, surfacing or other failure conditions. The existing two-chamber 1000 gallon septic tank appears to be
sealed and functioning. It appears that the field is accepting the wastewater flow from the tanks. County records
indicate that approximately 180 feet of 10-inch SB-2 pipe is in place. The system appears to be adequate to handle
the wastewater flows that have been applied however the theoretical capacity of the existing 10” SB-2 absorption
system is 697 gallons per day based on the previous State guidelines in effect at the time of construction. The total
septic tank capacity was reported to be 1000 gallons.
Subsurface Conditions
Percolation tests were conducted on August 23, 1991 by the county. The design percolation rate used was
determined to be 15 minutes per inch and should be suitable for a conventional absorption system expansion. Prior
to construction a new profile pit and percolation test shall be performed to verify the geotechnical conditions and
design criteria for the expansion trenches within the proposed installation locations. Evaluations and inspections by
the engineer and Eagle County should be performed during initial stages of construction to verify assumptions made
for the OWS design. The profile hole needs to be excavated for visual inspection by the Eagle County
Environmental Health Specialist and the Engineer prior to excavation of the absorption field. 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 Eagle County and the Engineer by the owner/contractor
needs to be made in order to schedule the site visit.
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 2
Existing Absorption System
The state approved equivalent sizing for 10” SB-2 tubing was on linear foot in place of 3 square feet of gravel
trench. The State certified this product for use in ISDS pursuant to a letter to Advanced Drainage Systems, Inc.
from the Colorado Department of Health, dated September 8, 1987, distributed to County ISDS Contacts. The
existing absorption system would have been sized at the time of installation to be equivalent to 540 square feet of
gravel trench (180 LF SB-2 x 3 SF gravel trench/1 LF SB-2 = 540 SF gravel trench).
Current Capacity
The estimated effluent generated is based on standard usage rates for residential at 150 gpd per bedroom.
We believe these rates per bedroom a conservative representation of the assumed wastewater generation.
Based upon the percolation test rates, the standard absorption area equation gives a recommended minimum
absorption area for a conventional gravel and pipe system using a peaking factor.
Ae (SF) = Q *(t) ½ : where Ae = Existing Area; Q = flow (gal/day)
5 t = time in minutes
Solving for Q (peak) with the applied percolation rate and equivalent field area results in:
Qp (gpd) = 540 (SF) * 5 = 697gpd : where Ae = 540; Qp = 697 (gal/day) peak flow
(14) ½ t = 15 minutes per inch
Q (gpd) = 697 (SF) = 465gpd : where Q =465 (gal/day) average design flow
1.5 1.5 = peaking factor
Q = 450 (gal/day) average flow per 3 bedrooms
Therefore current capacity of the existing system allows for the minimum of 450 gallon per day average with up to
697 gallons per day peak. Additional peak capacity is available however the system is older and due respect to
limitations on the capacity need to be acknowledged in terms of peak design flows. The system should continue to
perform as designed to handle the theoretical design flows with the usage based on peak flows from 3 bedrooms.
Expansion design
The estimated effluent generated is based on standard usage rates for residential at 150 gpd per bedroom.
We believe these rates per bedroom a conservative representation of the assumed wastewater generation.
The proposed addition/remodel will result in a 6-bedroom house. The design flow is calculated as follows:
Residence unit - 6 bedrooms @ 2 person /bedroom = 12 person
From the Eagle County I. S. D. S. Regulation;
Max. Design flow (Qd) = # of people x 1.5(avg. flow) gal/person/day.
Gallons per day for the subject house = 75 gal/person/day
Qd = 12*75*1.5 =1350 gal/day
Septic Tank Capacity Expansion
Q =1350
Volume (V) of tank = Design Flow * 1.25
(30 hour retention time)
V = 1350 gal/day * 1.25 = 1687
Install an additional 1000-gallon two compartment concrete septic tank in series with the existing tank.
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 3
Design Criteria
The absorption field is designed based on utilizing the suitable native soil for treatment in trenches.
Based on the reported percolation rate and observations of the percolation holes and review of the geotechnical
information we have designed a system that will treat the calculated quantity of effluent with native soils utilizing
the Long Term Acceptance Rate (LTAR) for the native soils. The treated effluent will then be absorbed into the
natural soils across the bottom area and a portion of the sidewall areas of the trench excavation. . The LTAR is
based on the interpolation of absorption rates corresponding to the average percolation rate. The wastewater
application rates are from Table 7-2, EPA Design Manual, Onsite Wastewater Treatment and Disposal Systems.
The absorption field is designed based on utilizing the suitable native soil for treatment in trenches. However if
some areas in the proposed trenches need soil replacement for added treatment efficiency and to mitigate the
presence of scattered cobbles and or boulders, we recommend the placement suitable soil or concrete sand, as
needed, to a level grade with the rest of the trench.
Soil Absorption System Expansion Design
The percolation test indicated an average rate of 15 minutes per inch. Therefore this rate is used to estimate a
loading rate for the soil and size the absorption area required for treatment utilizing native soils.
At = Absorption Area Total
Long Term Acceptance Rate method (LTAR):
LTAR loading rate for soil with perc rate between
6 and 15 min/inch = 0.8 gal/S.F./day
Existing flow based on 3 bedroom design is 675 gallon per day.
Existing field size credit based on the design flow is 523 S.F.
At=Qd/LTAR = 1350/0.8 = 1687 S.F.
At – Ae = 1687 – 523 = 1164 S.F.
We recommend using a gravelless leaching chamber absorption trench system. The county allows up to a 50%
adjustment in absorption area if gravelless leaching chambers are used in suitable soils. The equivalent Absorption
area per the Infiltrator Quick-4 leaching chamber unit is 10 S.F.
Apply a 50% reduction for utilizing gravelless infiltration chambers in a trench configuration.
.
A = 1164 sq. ft. x 0.50 = 582 sq. ft. (Applied 50% reduction)
Assume 10 square feet per chamber: 582 sq.ft. = 58 chambers Use 58 chambers
10 sq.ft/chamber
We recommend using a trench system composed of 3 trenches up to 80 feet long and 3 foot wide, containing
gravelles chamber units in 2 serial trenches with up to 20 Infiltrator Quick-4 chamber units each and 1 trench with
18 Infiltrator Quick-4 chamber units in the last serial trench. Excavate absorption trenches to accommodate a
minimum 582 S.F. of interior surface area. Pursuant to previous discussions with Eagle County Environmental
Health, serial distribution is recommended. An effluent filter shall be installed on the outlet of the secondary
chamber in the second septic tank. The filter should be inspected every six months. Maintenance shall include
cleaning the filter as needed and after periodic pumping of the tank.
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 4
We recommend that the trenches be connected with the inlet pipe coming into the inlet port of the first serial trench
chamber. The effluent flow will run the length of the first trench discharge through the outlet pipe connected to the
end chamber. The outlet pipe will run across the minimum 6’ separation distance to the second serial trench and
connect to the inlet port of the first chamber. The flow will run the length of the second trench and connect the same
way to the first chamber in the third trench. Each trench will be constructed level with successive trenches installed
at a lower elevation than the preceding trench to accommodate drainage in the distribution pipes and surface grades.
Each trench shall be constructed not to exceed a maximum depth of 3 feet. The method allows for the sloped terrain,
provides increased longevity of the system and allows for maintenance and/or partial reconstruction if needed. An
inspection port should be installed on the top cut out port on the serial end chamber in each trench. This will allow
for checking the performance of the system over time.
ISDS Operation and Maintenance
The system shall be inspected on a regular basis and be properly maintained. The system and responsibility for
repair and maintenance of the system will remain with the Lot Owner.
The onsite system should require minimal maintenance. Several factors influencing the need for maintenance
include: actual wastewater flows versus design flows, the volume of kitchen/domestic waste (excluding human
waste and toilet paper), excessive household chemicals and other toxic liquids. The tank, absorption field and
effluent filter should be visually inspected bi-annually for debris, wear, damage, leaks, or other potential problems.
In general, for a properly utilized system, septic tanks should be pumped and inspected every 2 - 4 years. The
effluent filters should be cleaned every six months and at the time of pumping. Absorption fields should be
maintained with suitable cover and kept free of root invasive plants. Positive surface drainage away from the
absorption field should be maintained.
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. 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 Regulations
further require site inspections and approval by the County Environmental Health Department of the exposed
components of the system prior to backfilling. Therefore the County Environmental Health Department should also
be contacted and notified of the construction schedule.
General Notes
1) All materials and installation practices shall conform to the Eagle County Individual Sewage Disposal
Regulation.
2) All sewer lines and distribution lines in the system shall be 4” Schedule 40 or SDR-35 PVC unless specified
otherwise on the plans.
3) Add a two-way clean out on the service line from the proposed house.
4) The system shall be plumbed to distribution effluent into the trenches with serial distribution.
5) The contractor shall ensure that the concrete septic tank and sewer lines are watertight.
6) The trench area must be protected to prevent damage from vehicular or livestock traffic and must be crowned to
divert drainage runoff away from the trenches to minimize surface infiltration.
7) The infiltration chambers shall be installed level in each trench. A splash plate shall be installed on the trench
bottom surface below the inlet in each serial trench to prevent scouring from the effluent or an appropriate
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 5
chamber end plate may be used to prevent scouring from the effluent. The top of the backfill over the chambers
shall be covered with filter fabric or other suitable pervious material to prevent the migration of fines from the
overlying topsoil layer.
8) The trenches must have a minimum cover of 12 inches. A final cover of topsoil suitable for vegetation, a
minimum 4” deep, shall be placed from the top of the pervious cover layer to the finished surface grade.
The absorption trenches must be sodded or covered with vegetative ground cover.
Our evaluation is based upon review of county records and information supplied to us by others.
If you have any question or need any additional information, please call.
Sincerely,
SOPRIS ENGINEERING, LLC
Paul E. Rutledge
Design Engineer
Yancy Nichol, P.E.
Project Engineer
cc: Laura Fawcett, Eagle County for Environmental Health
November 21, 2007
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
S OPRIS E NGINEERING • LLC civil consultants
Lourie Albanese
30 Vaquero Road.
Carbondale, CO 81623
RE: DRAFT_Addition/Upgrade Onsite Wastewater System, Albanese Residence, Lot A, Cook Minor
Subdivision, 30 Vaquero Rd. Eagle County, CO
SE Job No. 27228.01
Dear Lourie:
Pursuant to your request, attached is a letter/report presenting our findings in regard to a proposed upgrade and
expansion to your Existing Onsite Wastewater System (OWS) at the above referenced Site. The expansion of
treatment capacity is necessary to adequately handle the wastewater design flow resulting from your proposed
residential improvements. It is our understanding that you have applied for a building permit to construct an addition
that will include up to 3 new bedrooms. The existing OWS was permitted and installed for the existing 3 bedroom
residence in 1991. Our understanding the existing facilities are based on information provided by your and from
county records with regard to the as built conditions and capacity of the system. The letter provides a preliminary
design for expansion of the system based on our understanding of the site conditions and the previous design
criteria. We have reviewed previous percolation test information; site information forwarded to us by the owner,
calculated the theoretical OWS capacity for the existing absorption facility and designed reasonable OWS expansion
components as part of our scope of work.
Existing OWS Conditions
Based on our findings and the reporting of others we believe that the existing OWS system is feasible for continued
use. The system appears to be functioning based on Inspection of the tank, and lack of any evidence or reports of
backups, surfacing or other failure conditions. The existing two-chamber 1000 gallon septic tank appears to be
sealed and functioning. It appears that the field is accepting the wastewater flow from the tanks. County records
indicate that approximately 180 feet of 10-inch SB-2 pipe is in place. The system appears to be adequate to handle
the wastewater flows that have been applied however the theoretical capacity of the existing 10” SB-2 absorption
system is 697 gallons per day based on the previous State guidelines in effect at the time of construction. The total
septic tank capacity was reported to be 1000 gallons.
Subsurface Conditions
Percolation tests were conducted on August 23, 1991 by the county. The design percolation rate used was
determined to be 15 minutes per inch and should be suitable for a conventional absorption system expansion. Prior
to construction a new profile pit and percolation test shall be performed to verify the geotechnical conditions and
design criteria for the expansion trenches within the proposed installation locations. Evaluations and inspections by
the engineer and Eagle County should be performed during initial stages of construction to verify assumptions made
for the OWS design. The profile hole needs to be excavated for visual inspection by the Eagle County
Environmental Health Specialist and the Engineer prior to excavation of the absorption field. 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 Eagle County and the Engineer by the owner/contractor
needs to be made in order to schedule the site visit.
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 2
Existing Absorption System
The state approved equivalent sizing for 10” SB-2 tubing was on linear foot in place of 3 square feet of gravel
trench. The State certified this product for use in ISDS pursuant to a letter to Advanced Drainage Systems, Inc.
from the Colorado Department of Health, dated September 8, 1987, distributed to County ISDS Contacts. The
existing absorption system would have been sized at the time of installation to be equivalent to 540 square feet of
gravel trench (180 LF SB-2 x 3 SF gravel trench/1 LF SB-2 = 540 SF gravel trench).
Current Capacity
The estimated effluent generated is based on standard usage rates for residential at 150 gpd per bedroom.
We believe these rates per bedroom a conservative representation of the assumed wastewater generation.
Based upon the percolation test rates, the standard absorption area equation gives a recommended minimum
absorption area for a conventional gravel and pipe system using a peaking factor.
Ae (SF) = Q *(t) ½ : where Ae = Existing Area; Q = flow (gal/day)
5 t = time in minutes
Solving for Q (peak) with the applied percolation rate and equivalent field area results in:
Qp (gpd) = 540 (SF) * 5 = 697gpd : where Ae = 540; Qp = 697 (gal/day) peak flow
(14) ½ t = 15 minutes per inch
Q (gpd) = 697 (SF) = 465gpd : where Q =465 (gal/day) average design flow
1.5 1.5 = peaking factor
Q = 450 (gal/day) average flow per 3 bedrooms
Therefore current capacity of the existing system allows for the minimum of 450 gallon per day average with up to
697 gallons per day peak. Additional peak capacity is available however the system is older and due respect to
limitations on the capacity need to be acknowledged in terms of peak design flows. The system should continue to
perform as designed to handle the theoretical design flows with the usage based on peak flows from 3 bedrooms.
Expansion design
The estimated effluent generated is based on standard usage rates for residential at 150 gpd per bedroom.
We believe these rates per bedroom a conservative representation of the assumed wastewater generation.
The proposed addition/remodel will result in a 6-bedroom house. The design flow is calculated as follows:
Residence unit - 6 bedrooms @ 2 person /bedroom = 12 person
From the Eagle County I. S. D. S. Regulation;
Max. Design flow (Qd) = # of people x 1.5(avg. flow) gal/person/day.
Gallons per day for the subject house = 75 gal/person/day
Qd = 12*75*1.5 =1350 gal/day
Septic Tank Capacity Expansion
Q =1350
Volume (V) of tank = Design Flow * 1.25
(30 hour retention time)
V = 1350 gal/day * 1.25 = 1687
Install an additional 1000-gallon two compartment concrete septic tank in series with the existing tank.
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 3
Design Criteria
The absorption field is designed based on utilizing the suitable native soil for treatment in trenches.
Based on the reported percolation rate and observations of the percolation holes and review of the geotechnical
information we have designed a system that will treat the calculated quantity of effluent with native soils utilizing
the Long Term Acceptance Rate (LTAR) for the native soils. The treated effluent will then be absorbed into the
natural soils across the bottom area and a portion of the sidewall areas of the trench excavation. . The LTAR is
based on the interpolation of absorption rates corresponding to the average percolation rate. The wastewater
application rates are from Table 7-2, EPA Design Manual, Onsite Wastewater Treatment and Disposal Systems.
The absorption field is designed based on utilizing the suitable native soil for treatment in trenches. However if
some areas in the proposed trenches need soil replacement for added treatment efficiency and to mitigate the
presence of scattered cobbles and or boulders, we recommend the placement suitable soil or concrete sand, as
needed, to a level grade with the rest of the trench.
Soil Absorption System Expansion Design
The percolation test indicated an average rate of 15 minutes per inch. Therefore this rate is used to estimate a
loading rate for the soil and size the absorption area required for treatment utilizing native soils.
At = Absorption Area Total
Long Term Acceptance Rate method (LTAR):
LTAR loading rate for soil with perc rate between
6 and 15 min/inch = 0.8 gal/S.F./day
Existing flow based on 3 bedroom design is 675 gallon per day.
Existing field size credit based on the design flow is 523 S.F.
At=Qd/LTAR = 1350/0.8 = 1687 S.F.
At – Ae = 1687 – 523 = 1164 S.F.
We recommend using a gravelless leaching chamber absorption trench system. The county allows up to a 50%
adjustment in absorption area if gravelless leaching chambers are used in suitable soils. The equivalent Absorption
area per the Infiltrator Quick-4 leaching chamber unit is 10 S.F.
Apply a 50% reduction for utilizing gravelless infiltration chambers in a trench configuration.
.
A = 1164 sq. ft. x 0.50 = 582 sq. ft. (Applied 50% reduction)
Assume 10 square feet per chamber: 582 sq.ft. = 58 chambers Use 58 chambers
10 sq.ft/chamber
We recommend using a trench system composed of 3 trenches up to 80 feet long and 3 foot wide, containing
gravelles chamber units in 2 serial trenches with up to 20 Infiltrator Quick-4 chamber units each and 1 trench with
18 Infiltrator Quick-4 chamber units in the last serial trench. Excavate absorption trenches to accommodate a
minimum 582 S.F. of interior surface area. Pursuant to previous discussions with Eagle County Environmental
Health, serial distribution is recommended. An effluent filter shall be installed on the outlet of the secondary
chamber in the second septic tank. The filter should be inspected every six months. Maintenance shall include
cleaning the filter as needed and after periodic pumping of the tank.
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 4
We recommend that the trenches be connected with the inlet pipe coming into the inlet port of the first serial trench
chamber. The effluent flow will run the length of the first trench discharge through the outlet pipe connected to the
end chamber. The outlet pipe will run across the minimum 6’ separation distance to the second serial trench and
connect to the inlet port of the first chamber. The flow will run the length of the second trench and connect the same
way to the first chamber in the third trench. Each trench will be constructed level with successive trenches installed
at a lower elevation than the preceding trench to accommodate drainage in the distribution pipes and surface grades.
Each trench shall be constructed not to exceed a maximum depth of 3 feet. The method allows for the sloped terrain,
provides increased longevity of the system and allows for maintenance and/or partial reconstruction if needed. An
inspection port should be installed on the top cut out port on the serial end chamber in each trench. This will allow
for checking the performance of the system over time.
ISDS Operation and Maintenance
The system shall be inspected on a regular basis and be properly maintained. The system and responsibility for
repair and maintenance of the system will remain with the Lot Owner.
The onsite system should require minimal maintenance. Several factors influencing the need for maintenance
include: actual wastewater flows versus design flows, the volume of kitchen/domestic waste (excluding human
waste and toilet paper), excessive household chemicals and other toxic liquids. The tank, absorption field and
effluent filter should be visually inspected bi-annually for debris, wear, damage, leaks, or other potential problems.
In general, for a properly utilized system, septic tanks should be pumped and inspected every 2 - 4 years. The
effluent filters should be cleaned every six months and at the time of pumping. Absorption fields should be
maintained with suitable cover and kept free of root invasive plants. Positive surface drainage away from the
absorption field should be maintained.
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. 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 Regulations
further require site inspections and approval by the County Environmental Health Department of the exposed
components of the system prior to backfilling. Therefore the County Environmental Health Department should also
be contacted and notified of the construction schedule.
General Notes
1) All materials and installation practices shall conform to the Eagle County Individual Sewage Disposal
Regulation.
2) All sewer lines and distribution lines in the system shall be 4” Schedule 40 or SDR-35 PVC unless specified
otherwise on the plans.
3) Add a two-way clean out on the service line from the proposed house.
4) The system shall be plumbed to distribution effluent into the trenches with serial distribution.
5) The contractor shall ensure that the concrete septic tank and sewer lines are watertight.
6) The trench area must be protected to prevent damage from vehicular or livestock traffic and must be crowned to
divert drainage runoff away from the trenches to minimize surface infiltration.
7) The infiltration chambers shall be installed level in each trench. A splash plate shall be installed on the trench
bottom surface below the inlet in each serial trench to prevent scouring from the effluent or an appropriate
Lourie Albanese
SE Job No. 27228.01
November 21, 2007
Page 5
chamber end plate may be used to prevent scouring from the effluent. The top of the backfill over the chambers
shall be covered with filter fabric or other suitable pervious material to prevent the migration of fines from the
overlying topsoil layer.
8) The trenches must have a minimum cover of 12 inches. A final cover of topsoil suitable for vegetation, a
minimum 4” deep, shall be placed from the top of the pervious cover layer to the finished surface grade.
The absorption trenches must be sodded or covered with vegetative ground cover.
Our evaluation is based upon review of county records and information supplied to us by others.
If you have any question or need any additional information, please call.
Sincerely,
SOPRIS ENGINEERING, LLC
Paul E. Rutledge
Design Engineer
Yancy Nichol, P.E.
Project Engineer
cc: Laura Fawcett, Eagle County for Environmental Health