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GARFIELD COUNTY BUILDING AND SANITATION DEPARTMENT
108 Eighth Street, Suite 201
Glenwood Springs, Coloradof 81601
Phone (970) 945-8212
INDIVIDUAL SEWAGE DISPOSAL PERMIT
PROPERTY
Owner's Name t 1 V`tf 1 I) to 1
C 153 t` cukt S usCers+(e Ci?/V7
I- i3!c_K 2 EIk CfreK bcueIcrktieti+
Permit 4 0 5 0
Assessor's Parcel No.
02/-5-c 5/—o3 -a7
This does not constitute
a building or use permit
Present Address 015
.3 (3i thio )0 /3( Sh' Phone '1 ?y—
System
v—
System Location
Legal Description of Assessor's Parcel No
SYSTEM DESIGN
Septic Tank Capacity (gallon) Other
Percolation Rate (minutes/inch) Number of Bedrooms (or other)
Required Absorption Area - See Attached
Special Setback Requirements.
Date Inspector
FINAL SYSTEM INSPECTION AND APPROVAL (as installed)
Call for Inspection (24 hours notice) Before Covering Installation
System Installer
Septic Tank Capacity ! 44S-7 Si A
Septic Tank Manufacturer or Trade Name
Septic Tank Access within 6 • of surface
Absorption Area
Absorption Area Type and/or Manufacturer or Trade Name
Adequate compliance with County and State regulations/requirements
Other
1r� !y� ipa-&s
Date (� f V l (- 0 Inspector 1/4�-iC- /y (-� %�� 4Q
RETAIN WITH RECEIPT RECORDS AT CONSTRUCTION SITE
*CONDITIONS:
1. All installation must comply with all requirements of the Colorado State Board of Health Individual Sewage Disposal Systems Chapter
25, Article 10 C.R.S. 1973, Revised 1984
2. This permit is valid only for connection to structures which have fully complied with County zoning and building requirements. Con-
nection to or use with any dwelling or structures not approved by the Building and Zoning office shall automatically be a violation or a
requirement of the permit and cause for both legal action and revocation of the permit
3 Any person who constructs,alters, or installs an individual sewage disposal system in a manner which involves a knowing and material
variation from the terms or specifications contained in the application of permit commits a Class I, Petty Offense ($500.00 fine — 6
months in jail or both).
INDIVIDUAL SEWAGE DISPOSAL SYSTEM APPLICATION
OWNER"Daf,,r-1
ADDRESS (16 3 /if -/ (<< Cc _ y f ( • ' PHONE % 7') ' y -_1/5/
CONTRACTOR
ADDRESS PHONE
PERMIT REQUEST FOR ( NEW INSTALLATION
( ) ALTERATION ('j REPAIR
Attach separate sheets or report showing entire area with respect to surrounding areas, topography of area, habitable
building, location of potable water wells, soil percolation test holes, soil profiles in test holes (See page 4).
LOCATION OF PROPOSED FACILITY:
Near what City of Town L-' — h- l' (;(11 e Size of Lot 1 . 15
Legal Description or Address y I S 3
WASTES TYPE:
IL Y 1 1
( ) DWELLING
( ) COMMERCIAL OR INDUSTRIAL
( ) OTHER—DESCRIBE
(
) TRANSIENT USE
) NON-DOMESTIC WASTES
BUILDING OR SERVICE TYPE: 14P 5t d e
Number of Bedrooms 3 Number of Persons 3
( ) Garbage Grinder (vjAutomatic Washer (v) Dishwasher
SOURCE AND TYPE OF WATER SUPPLY: ( ) WELL ( ) SPRING ( ) STREAM OR CREEK
If supplied by Community Water, give name of supplier:
DISTANCE TO NEAREST COMMUNITY SEWER SYSTEM: rr,, / < <
Was an effort made to connect to the Community System? -;y,
A site ' lan is re ' uired to be submitted that indicates the followin ' MINIMUM distances:
Leach Field to Well:
Septic Tank to Well:
Leach Field to Irrigation Ditches, Stream or Water Course:
Septic System (septic tank & disposal field) to Property Lines:
100 feet
50 feet
50 feet
10 feet
YOUR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT WILL NOT BE ISSUED WITHOUT
A SITE PLAN.
GROUND CONDITIONS:
Depth to first Ground Water Table
Percent Ground Slope -z
2
TYPE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED:
(VS SEPTIC TANK ( ) AERATION PLANT ( ) VAULT
( ) VAULT PRIVY ( ) COMPOSTING TOILET ( ) RECYCLING, POTABLE USE
( ) PIT PRIVY ( ) INCINERATION TOILET ( ) RECYCLING, OTHER USE
( ) CHEMICAL TOILET( ) OTHER -DESCRIBE
FINAL DISPOSAL BY:
ABSORPTION TRENCH, BED OR PIT
UNDERGROUND DISPERSAL
ABOVE GROUND DISPERSAL
OTHER -DESCRIBE
( ) EVAPOTRANSPIRATION
( ) SAND FILTER
( ) WASTEWATER POND
WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE? 4'2
PERCOLATION TEST RESULTS: (To be completed by Registered Professional Engineer, if the Engineer does the
Percolation Test)
Minutes per inch in hole No. 1 Minutes per inch in hole No. 3
Minutes per inch in hole No. 2 Minutes per inch in hole No. _
Name, address and telephone of RPE who made soil absorption tests:
Name, address and telephone of RPE responsible for design of the system:
Applicant acknowledges that the completeness of the application is conditional upon such further mandatory and
additional tests and reports as may be required by the local health department to be made and furnished by the applicant
or by the local health department for purposed of the evaluation of the application; and the issuance of the permit is
subject to such terms and conditions as deemed necessary to insure compliance with rules and regulations made,
information and reports submitted herewith and required to be submitted by the applicant are or will be represented to
be true and correct to the best of my knowledge and belief and are designed to be relied on by the local department of
health in evaluating the same for purposes of issuing the permit applied for herein. I further understand that any
falsification or misrepresentation may result in the denial of the application or revocation of any permit granted based
upon said application and in legal action for perjury as provided by law.
Signed 1-)c , r- j c'/ u Date ' I -
PLEASE DRAW AN ACCURATE MAP TO YOUR PROPERTY!!
3
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cn
Daniel Silva
0153 Navajo Street
New Castle, CO 81647
May 3, 2005
RE: Existing Residence— Lots 7, Elk Creek Subdivision, Garfield County. Colorado, On-site
Wastewater System (OWS),
SE Job No. 25096.01
Dear Daniel:
Pursuant to your request this letter presents our findings in regard to the feasibility and design for an Onsite
Wastewater System (OWS) at the above referenced Site. Our evaluation of the site conditions is based on
information provided by you and others for use in supporting your application to Garfield County. Our
recommendations are in accordance with the State of Colorado ISDS Regulations. We have reviewed the
information forwarded to us, conducted a site visit, formulated an OWS design and created a site plan with
construction details as part of our scope of work.
Conclusions
Based on our findings we believe that the design and installation of an approved OWS is feasible in
accordance with the Regulations. We recommend that new 1250 -gallon dual compartment septic tank be
installed with an effluent filter in the outlet tee. Effluent will gravity discharge to an engineered sand
filter/soil absorption bed system utilizing a synthetic absorption/treatment media in a bed configuration.
We recommend the use of a distribution box to equally distribute effluent to perforated distribution lines
running the length over the treatment media in the bed. To provide additional infiltrative surface area and
peak volume storage we recommend that the treatment bed be installed with under drains that discharge the
treated effluent to a seepage pit near the bed. The OWS will be installed within the general location as
delineated on the plan. Our design is outlined below.
Site Location and Existing Conditions
The subject site is located on Lot 7, Elk Creek Subdivision, near the Town of New Castle Colorado on the
west side of Navaho Street. The Site comprises approximately 0.2 acres. An existing 3 -bedroom double
wide pre -manufactured home exist on the site and is served by an existing septic tank and seepage pit
system. The approximately 20 -year-old septic system is failing. The site is bounded on the south and
north by adjacent developed lots and on the west by a small pasture. The site has moderate slopes (5%-
15%) toward the west. The site is vegetated with grasses, bushes, and weeds. Domestic water is supplied
by a central water system.
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311• Fax (970) 704-0313
SOPRIS ENGINEERING LLC
civil consultants
Daniel Silva
SE Job No. 25096.01
May 11, 2005
2
Proposed Site Conditions
It is our understanding that you intend to utilize the existing home as is with future plans for a major
remodel or replacement with a similar size home. The current proposed improvements would include a
new OWS system with appropriate site grading. The proposed absorption/treatment field area is designed
for receiving effluent treated through a select media in proposed bed. Due to the limited area and the need
to effectively treat wastewater we believe it is desirable to utilize an enhanced absorption/treatment system
for good secondary treatment of the effluent and recovery by infiltration into the ground.
Subsurface Conditions
A subsurface investigation was conducted on April 18, 2005 by Hepworth-Pawlak Geotechnical, Inc. (HP).
The HP report is dated April 20, 2005, Job Number 105 322. The subsoil encountered at the site in the
vicinity of the proposed absorption field consists of 1/2 foot of topsoil overlying sandy clayey gravel with
cobbles to a depth of 11 feet in the profile pit. Groundwater was not encountered in the test profile pit.
Percolation testing was performed at varying levels in the stepped profile pit. The fastest measured rate
was 60 minutes per inch and the slowest measured rate was 120 minutes per inch. The average
percolation rate is 90 minutes per inch. We recommend that a synthetic absorption/treatment media over
sand filter media be used for secondary treatment. We expect the soils in the proposed field location and
the proposed seepage pit at lower depths to be suitable for the infiltration of treated/filtered effluent. The
synthetic and sand filter media will provide secondary treatment of wastewater for infiltration into the
native soils.
Design Criteria
The existing dwelling has a total of 3 bedrooms. The dwelling will utilize permanently installed water
conservation devices. Therefore an appropriate reduction in the Design flow rate of 20% has been applied
for conservation. The design flow is calculated as follows:
Single family home — equivalent 3 bedroom population @ 2 person /bedroom = 6 persons.
From the State I. S. D. S. Regulations:
Max. Design flow (Qd) _ # of people x (avg. flow) x 1.5 gal/person/day.
Gallons per day per person for the subject house = 75 gal/person/day
Assume maximum 4 people daily population
Qd = 6*75*1.5* =675 gal/day
Design flow Qd = 675 gpd
Apply 20% reduction to Qd for water saving fixtures.
Qd(reduce) = Qd x 0.80 = 675 (0.80) =540 gpd
Daniel Silva
SE Job No. 25096.01
May 11, 2005
3
Septic Tank Design
Based on Design Flow Qd.
Qd = 675 gal/day
Volume (V) of tank = Design Flow * 1.25
(30 hour retention time)
V = 675 gal/day * 1.25 days = 844 gallons
Use a dual compartment 1250 -gallon concrete septic tank.
Absorption/Treatment System Design
The effluent will be treated underground by distribution through a synthetic media over 24" of filter sand.
The majority of treated effluent will be absorbed into the native soils below the bed. During periods of
peak loading treated effluent will be collected in underdrain pipes installed in a gravel layer below the sand
filter layer and be discharge to a 4 foot diameter concrete seepage pit with a 12 foot diameter gravel
envelope for infiltration into the ground. Influent from the septic tank will be equally distributed through
the entire length and width of the bed. The bed is designed to treat effluent through the biomat that will
form on the synthetic Elgen In -Drain units to be installed over the sand filter media. The sand filter media
will provide additional treatment and allow for absorption of the treated effluent into the soil and to the
underdrains. We do not expect a bio mat to form on the native soil therefore the acceptance rate of the soil
will be maintained to allow for recovery of the design flow volumes. We are utilizing the guidelines
approved by the State of Colorado for sizing these types of absorption/treatment systems.
The preferred synthetic absorption/treatment media is the Elgen In -Drain system over 24" of filter sand.
The Elgen In -Drain units are a 7" deep by 24" wide by 48" long synthetic distribution/treatment product.
which efficiently distributes effluent over the product's entire horizontal and vertical surface areas. The
additional sand provides additional treatment and increases the sidewall absorption area in the bed. We do
not anticipate that a conventional bio mat will form on the excavated bed surface because the system is
designed to form bio mat in the synthetic media. The sizing of the bed system is per the guidelines
approved by the State of Colorado for sizing of sand filter beds and the incorporated Eljen In -Drain system.
The State allows an equivalency of 5.0 sf per linear foot of conventional 3 -foot trenches.
We recommend the use of 32 Eljen In -Drain units. To be placed in 3 rows for a total of 384 square feet of
horizontal bed area. This recommendation is based on the effective treatment area required for Eljen In -
Drain units and use of the sand media that has a loading rate of 0.95 gal./S.F./day with respect to the
general indications of the soil type.
Area required for a sand filter treatment bed:
Long Term Acceptance Rate method (LTAR)
Using imported course sand media yields the minimum area:
LTAR maximum loading rate for sand filter = 0.95ga1/S.F./day
Qd(reduce) = Qd x 0.80 = 675 (0.80) =540 gpd
A=Q/LTAR = 540/0.95 = 568 sq. ft.
Daniel Silva
SE Job No. 25096.01
May 1 1, 2005
4
Apply Eljen In -Drain sizing factor of 5 SF equivalent absorption area per L.F.
A(Eljen In -Drain treatment area)= A / 5 = 568 / 5 = 113 L.F.
Treatment surface area equal to 113 L.F. x 2 FT = 226 S.F. required
Therefore the number of Eljen In -Drain units required equals 113 L.F. / 4 FT = 28 units.
Use 28 Eljen In -Drain units providing for an initial treatment surface of 226 S.F. of In -drains over
approximately 348 S.F. of select sand 24" deep.
Use (4) rows 28 FT long with 7 In -Drain units per each row in a 29' x 12' bed.
The top of the In -Drain units will be set in the bed over 24" of sand placed from a level depth of 48"-60"
below the surface grades. The sand will be placed over 12" of clean -screened rock cover with a layer of
filter fabric. The gravel will be placed over the native soil in the area of the field. Two 4" underdrain pipes
will be placed in the gravel with the invert at a level approximately 3" above the bottom of the gravel. A
minimum separation distance of 1 foot will be maintained between the In -drain rows with a minimum 6"
separation around the perimeter of the excavation. Individual 4" perforated distribution piping will be
placed on the center of each In -Drain row and run the entire length. The ends of the distribution pipes will
be connected with a solid header pipe. The distribution pipes and the In -Drain units shall be covered with
filter fabric placed down the sides of the In -Drain units. Additional select sand media will be backfilled
around the In -Drain units to the top of the distribution pipe. The bed will be backfilled with suitable
excavated soil (3" minus material) to the finished grade. The top of the bed shall be graded slightly above
the finished grade to allow positive drainage away from the bed surface.
The underdrain pipes will be connected to a solid 4" header pipe at the end of the bed. A 4" tee connection
will connect a solid 4" drain pipe to the seepage pit to allow excess treated influent to drain to the seepage
pit for infiltration into the soil at lower depths. The seepage pit structure will be approximately 8' deep
from the top of the gravel layer. A minimum 9 -foot diameter gravel envelope will be placed around the 4'
diameter concrete drywell structure. The gravel will be placed to a depth of approximately 9' from the level
at the top of the gravel layer in the treatment bed. The space between the treatment bed and the drywell
will be maintained and/or backfilled with compacted clayey soils to maintain a hydraulic barrier between
the bed and the seepage pit.
The additional infiltrative surface area around the perimeter of the seepage dispersal pit is based on the
depth of the installed gravel envelope at a depth 9 feet with an average diameter of 9 feet.
Seepage dispersal pit sidewall Area = PI x Diameter x Depth = 3.142 x 9 x 9 = 254 square feet.
The additional infiltrative surface area around the perimeter of the gravel layer in the treatment bed is
based on the 12" depth of the installed gravel and the perimeter length of the bed excavation.
Treatment bed gravel layer Sidewall Area = {(2 x bed length) + (2 x bed width)} x Depth of gravel.
A={(2 x 29) + (2 x 12)} x 1 = 82 square feet.
The total absorption area in the system is 720 S.F.
Daniel Silva
SE Job No. 25096.01
May 11, 2005
5
Distribution System
The need to assure equal distribution of effluent across the entire surface of the treatment media will be by
gravity distribution across the bed. The transport line from the septic tank to the absorption/treatment field
shall be 4" SDR -35 PVC routed to a distribution box. Individual 4" PVC distribution lines from the
distribution box to each In -Drain rows will connect to perforated distribution lines running the length of
each trench. The distribution lateral shall be oriented at 5 and 7 o'clock. The perforated distribution pipe
will be installed on the center top of the In -drain units with the orifices oriented to drip at a diagonal
downward (5 an 7 o'clock). The distribution pipe and the In -Drain units will be covered with filter fabric.
The effluent will distribute along the entire length of the bed. An inspection port should be installed on the
ends of each perforated distribution pipe on the outer rows.
OWS Operation and Maintenance
The engineered 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 owner shall
inspect the OWS and to perform all maintenance and repairs necessary to ensure that the system is
operating as designed. The components of the OWS will be inspected within 30 days of being placed into
operation and thereafter every six months. The effluent filter shall be maintained when the tank is pumped
or as needed. Suitable risers, lids, component handles and extensions on the tank and filter assemblies will
be installed to provide easy access from the surface. We recommend a periodic inspection and
maintenance procedure be performed every 6 months
The OWS 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 other applicable system components 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
to provide adequate time to discuss the system components, answer questions, resolve any conflict issues
and schedule inspection site visits based on construction progress. 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 after construction is complete.
General Notes
Daniel Silva
SE Job No. 25096.01
May 11, 2005
6
1) All materials and installation practices shall conform to the State Individual Sewage Disposal
Regulations.
2) All sewer lines and distribution lines in the system shall be Schedule 40 or SDR -35 PVC unless
specified otherwise on the plans and shall be watertight.
3) Add a two-way clean out on the service line from the proposed house.
4) The system shall be plumbed to distribute effluent into the bed rows with equal distribution.
5) The contractor shall ensure that the concrete septic tank is watertight and that an effluent filter is
installed in the outlet tee per the manufactures recommendations.
6) The bed area must be protected to prevent damage from vehicular or livestock traffic and graded to
allow surface water to runoff the top and around the bed.
7) The In -Drain units shall be installed level in the bed. The distribution pipe and the In -Drain units will
be covered to the bottom of the trench with filter fabric to prevent the migration of fines.
8) A final cover of soil suitable for vegetation, a minimum 12" deep, shall be placed from the top of the
filter fabric to the finished surface grade.
9) Every effort shall be made to minimize the damage to surrounding land and vegetation on either side of
the bed.
10)The bed must be seeded and mulched or covered with vegetative ground cover.
Our design and recommendations are based upon data supplied to us by others. If subsurface or site
conditions are found to be different from those presented in this report, we should be notified to evaluate
the effect it may have on the proposed OWS.
If you have any question or need any additional information, please call.
Sincerely,
SOPRIS ENGINEERING, LLC
Paul E. Rutledge
Design Engineer
Gettecr,
HEPWORTH -PAWLAK GEOTECHNICAL
April 20, 2005
Dorais Excavating, Inc.
Attn: Daniel Silva
P.O. Box 391
Carbondale, Colorado 81623
Hepworth-Pawiaic Geotechnical, Inc.
5020 Counry Road 154
Glenwood springs, Colorado 61601
Phone: 970-945-7988
Fax: 970-945-8454
email: hpgeo@hpgeotech.com
Job No. 105 322
Subject: Percolation Testing for Proposed Seepage Pit and Septic Disposal Design,
Lot 7, Block 2, Ellc Creek Subdivision, 153 Navajo Street, New Castle,
Colorado
Dear Mr. Silva:
As requested, Hepworth-Pawlak Geotechnical, Inc. performed percolation testing at the
subject site. The testing was done in accordance with our agreement for professional
services to you, dated April 15, 2005. We understand that the results of the percolation
test will be used by Paul Rutledge with Sopris Engineering to design a seepage pit
infiltration system to replace the existing failing system.
A pit was excavated at the rear of the existing residence in the area of the proposed new
infiltration septic disposal system as directed by Paul Rutledge with Sopris Engineering
on April 17, 2005. The subsoils exposed in the pit consisted of about'/ foot of topsoil
overlying stratified sandy clay and gravel with cobbles (alluvial deposits) down to the
bottom pit depth of 11 feet. No free water was observed in the pit and the soils were
slightly moist to moist. Percolation test holes had been hand dug at three levels within
the pit and soaked with water by the client on April 17, 2005.
Percolation testing was conducted on April 18, 2005 by a representative of Hepworth-
Pawlak Geotechnical, Inc. The percolation test results are summarized on Table 1. The
percolation test results indicate infiltration rates between 60 and 120 minutes per inch.
The variable percolation rates appear to be due to the stratified subsoils and relatively
slow due to the clay content. Percolation test hole P-1 was run in the bottom of the pit
where the soils were sandy and contained more gravel and cobbles. Percolation test holes
P-2 and P-3 were run at the higher levels of the pit which contained more clay soils.
If you have any questions or need further assistance, please call our office.
Sincerely,
HEPWORTH - PAWLAK GEOTECHNICAL, INC.
Trevor L. Knell, P.E.
Reviewed by:
Steven L. Pawlak, P.E.
TLK/ksw
attachments Table 1 -
cc: Sopris Engineerin
Parker 303-841-7119 • Colorado Springs 719-633-5562 • Silverthome 970-468-1989
HEPWORTH-PAWLAK GEOTECHNICAL, INC.
TABLE 1
PERCOLATION TEST RESULTS
JOB NO. 105 322
HOLE NO.
HOLE DEPTH
(FEET)
LENGTH OF
INTERVAL
(MIN)
WATER
DEPTH AT
START OF
INTERVAL
(INCHES)
WATER
DEPTH AT
END OF
INTERVAL _
(INCHES)
DROP IN
WATER
LEVEL
(INCHES)
AVERAGE
PERCOLATION
RATE
(MIN./INCH)
P-1
11
15
7 1/2
5 1/4
2 1/4
5 1/4
4 3/4
1/2
4 3/4
4 1/4
1/2
4 1/4
4
1/4
60
4
3 3/4
1/4
3 3/4
3 1/2
1/4
3 1/2
3 1/4
1/4
3 1/4
3
1/4
P-2
51/2
15
7 1/2
7 1/4
1/4
120
7 1/4
7
1/4
7
6 3/4
1/4
6 3/4
6 1/2
1/4
6 1/2
6 3/8
1/8
6 3/8
6 1/4
1/8
6 1/4
6 1/8
1/8
6 1/8
6
1/8
P-3
3
15
6 1/2
6
1/2
90
6
5 1/2
1/2
5 1/2
5 1/4
1/4
5 1/4
5
1/4
5
4 7/8
1/8
4 7/8
4 3/4
1/8
4 3/4
4 1/2
1/4
4 1/2
4 3/8
1/8
Note: Percolation test holes were hand dug at three levels within a backhoe pit excavated in
the approximate location of the proposed septic system and soaked by the client one
day prior to testing. Percolation tests were conducted on April 18, 2005. The average
percolation rates were based on the last three readings of each test.
10/30/2006 09:57 970-704-0313
SOPRIS ENGINEERING
PAGE 01
FAX Transmittal
Ti: Janelle
Conan Garfield County Building Department
Fexth 384-3470
Bate: October 30, 2006
Total Pages: 3
SE Project Ne. 25096
fret Paul Rutledge
Message: As -Build OWS
• Original not to follow
0 Original to follow by mail
0 Original to be delivered by messenger
0 Original to be picked up
502 main street • suite A3 n carbondale, CO 81623 D (970) 704-0311
fax (970) 704-0313
SOPRIS ENGINEERING • LLC
civil consultants
10/30/2006 09:57 970-704-0313
SOPRIS ENGINEERING
PAGE 02
October 17, 2006
Daniel Silva
0153 Navajo Street
New Castle, CC) 81647
RE: AS -BUILT OWS -Existing Residence— Lots 7, Elk Creek Subdivision, Garfield County, Colorado,
On-site Wastewater System (OWS),
SE Job No. 25096.01
Dear Daniel:
Pursuant to requirements, this letter provides documentation that the new Onsite Wastewater System (OWS)
recently installed at the above referenced site is in general compliance with the permitted design. Sopris
Engineering inspected the excavations and the installation of system components at various times during
construction prior to final backfill. The replacement system installed on site was designed and built to serve the
needs of the existing 3 -bedroom double wide pre -manufactured home. Sopris Engineering performed visits to
inspect and document the as built conditions of the constructed system. We have coordinated our efforts with the
system installer. The as built conditions and installation of the new OWS components is in compliance with the
permitted design specifications for the system.
The System was installed in accordance with Garfield County Regulations; the design presented in the Sopris
Engineering design drawing dated May 11, 2005. A 1250 -gallon dual compartment concrete septic tank was
installed with appropriate sanitary tees and an effluent filter in the outlet tee. Effluent gravity discharges to an
engineered sand filter/soil absorption bed system utilizing a synthetic absorption/treatment media in a bed
configuration. The absorption field was constructed with a total of 32 Eljen In -Drain units placed in 3 rows for
a total of 384 square feet of horizontal bed area. The units were placed over approximately over 24" of filter
sand overlying approximately 12" of clean -screened rock cover with a layer of filter fabric. Individual 4"
perforated distribution piping is installed on the center of each In -Drain row and runs the entire length. The
ends of the distribution pipes are connected with a solid header pipe. The distribution pipes and the In -
Drain units are covered with filter fabric placed down the sides of the In -Drain units.
Two 4" underdrain pipes are placed in the gravel with the invert at a level approximately 3" above the
bottom of the gravel. The underdrain pipes are connected to a solid 4" header pipe at the end of the bed.
A 4" tee connection connects a solid 4" drain pipe to the seepage pit to allow excess treated influent to
drain to the seepage pit for infiltration into the soil at lower depths. The seepage pit structure is
approximately 8' dcep from the top of the gravel layer. A 9 -foot diameter gravel envelope is in place
around the 4' diameter concrete drywell structure. Individual 4" perforated distribution piping is installed
on the center of each In -Drain row and runs the entire length. The ends of the distribution pipes are
connected with a solid header pipe. The distribution pipes and the In -Drain units are covered with filter
fabric placed down the sides of the In -Drain units. The total absorption area in the system is 720 S.F.
The bed is backfilled with suitable excavated soil (3" minus material) to the finished grade. The top of the
bed is graded slightly above the finished grade to allow positive drainage away from the bed surface.
Inspection ports were installed at each end of the bed. The system was installed in consistant soils across the
field. No ground water was encountered to a depth of 12 feet. The construction was completed utilizing specified
materials installed according to design.
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
SOPRIS ENGINEERING LLC
civil consultants
10/30/2006 09:57 970-704-0313
OWS Operatiotand Maintenance
SOPRIS ENGINEERING
PAGE 03
Daniel Silva
SE Job No. 25096.01
October 17. 2006
Page 2
All components of the engineered OWS shall be inspected on a regular basis and be properly maintained.
The re establishment of vegetative cover over the field and responsibility for inspection and maintenance of
the system will remain with the Lot Owner or the owners representative. The owner shall periodically
inspect the OWS and to perform all maintenance and repairs as necessary to ensure that the system is in
good operating condition and performing as designed.
The OWS 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. sanitary
tees and effluent filter should be visually inspected bi-annually for clogging debris, damage, leaks, or other
potential problems. In general, for a properly utilized system, septic tanks should be pumped and inspected
every 3 - 7 years. The effluent filter should be cleaned every six months and at the time of pumping.
Absorption fields should be maintained with suitable vegetative cover and kept free of root invasive plants.
Positive surface drainage away from the absorption field should be maintained.
If you have any question or need any additional information, please call.
Sincerely.
SOPRIS ENGINEERING, LLC
Paul.E.:Rutledge