HomeMy WebLinkAboutSeptic Application- Permiti p $785t
INDIVIDUAL SEWAGE DISPOSAL SYSTEM APPLICATION rPcsua4a2
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OWNER f UwiA i�Ai.� 2 -LG 33,44nAtt Inalksueo
ADDRESS 1)1 E- °Alta 3r. So )ver UgYNi 014-U102- PHONE (zi9+) 4ze -47o4-
CONTRACTOR E -r. Cre-r aA,- CoNTaacrole-
ADDRESS 174- FLYWCr Ft SIA Ro, c4-46.1�ra i [o P, bz3 PHONE 677") 964- e6s9
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PERMIT REQUEST FOR ( ) NEW INSTALLATION ( ) ALTERATION ( ) 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 Eta_ Co 8/i, 5-6 Size of Lot 35 Ac
Legal Description or Address 1 -79 3 6.:0"1--f �Afl Z I `i , IZ if -LE co 816 sC
WASTES TYPE: (X) DWELLING ( ) TRANSIENT USE
( ) COMMERCIAL OR INDUSTRIAL ( ) NON-DOMESTIC WASTES
( ) OTHER - DESCRIBE
BUILDING OR SERVICE TYPE: 311-5- Pop Co--rA4j. I'-aw,op=c_ Ckgx PE,tn r-1- 7852)
Number of Bedrooms / /m N . Z) Number of Persons 4-
(4 Garbage Grinder ( ) Automatic Washer ( ) 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:
Was an effort made to connect to the Community System?
A site plan is required to be submitted that indicates the following MINIMUM distances:
Leach Field to Well:
Septic Tank to Well:
Leach Field to Irrigation Ditches, Stream or Water Course:
Septic System 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
2
TYPE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED:
( ) 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 ( ) EVAPOTRANSPIRATION
( ) UNDERGROUND DISPERSAL ( ) SAND FILTER
( ) ABOVE GROUND DISPERSAL ( ) WASTEWATER POND
( ) OTHER - DESCRIBE
WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE"
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: 945 - z 2c,9
(r / 7-}j Jyv�j'S.:;.-1 }UC. Z / NT):,L D1p-Iva in -.ac (0 AILD)
Name, address and telephone of RPE responsible for design of the system: 7 ua • 0 3l1
So?g-v, 1 ,. &1,.IF ��\w1s LLC , 5ut niA Ira Sr? -ea. r- %A3 (,Ai.>rx.,PAt„c. Lo Ydt13
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 l�� N
Ll
4M SAcIcS��
PLEASE DRAW AN ACCURATE MAP TO YOUR PROPERTY
Date Oily/
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March 20, 2001
Steve Eichhorst
B & H Contractors, Inc.
Puma Paw Ranch
174 Flying Fish Road
Carbondale, CO 81623
RE: Puma Paw Ranch — Proposed ISDS System, Area 5, West Rifle Creek. Garfield
County, CO
SE Job No. 20110.01
Dear Steve:
Pursuant to your request, attached herewith is a letter/report presenting our findings in regard to the
feasibility and design for Individual Sewage Disposal Systems (ISDS) at the above referenced Site. This
design is based on our evaluation of the site conditions with information provided by others for use in
supporting your application to Garfield County. Our recommendations are in accordance with Garfield
County and the State of Colorado ISDS Regulations. Sopris Engineering has previously submitted an
ISDS design for 4 other locations on the ranch. We have reviewed the information forwarded to us
regarding Area 5, conducted a site visit, formulated ISDS designs and created a site plan with construction
details as part of our scope of work. Supporting documentation including percolation test results and the
geotechical report is attached.
Conclusions:
The site contains an existing cottage known as Area 5 in which a new individual septic systems need to be
replaced to serve the needs of the re -development on the ranch. Based on our findings we believe that the
design and installation of approved ISDS system is feasible in accordance with the Regulations of Garfield
County and the State of Colorado. The following table summarizes the components of the Area 5
individual septic disposal system.
Area
ISDS Locations
Number
Bedrooms
#
Use tank
Volume
gal
Absorption
Min. area
SF
5
EXISTING
COTTAGE
1 (min. 2)
1000
225
We recommend that a new, dual compartment, concrete septic tank be installed that will discharge effluent
to a soil absorption trench system. The soil absorption system will consist of graveless absorption
chambers installed in 3' wide by 2' deep trenches. The effluent will discharge to absorption chambers
installed in natural soils. We have proposed the addition of an effluent filter in the secondary camber of
each septic tank. The filtered effluent will discharge to a flow splitter basins via a 4" PVC pipe installed
with a minimum 1% slope. The effluent will be equally distributed to multiple trench systems from a flow
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
SOPRIS ENGINEERING •LLC
civil consultants
Steve Eichhorst
SE Job No. 20110.01
March 20, 2001
Page 2
splitter basin through individual discharge pipes to each trench in the system. The individual system will
meet all required setbacks and will be installed within the general location indicated on the plan. Our
design calculations are outlined below and delineated on the attached plans and details.
Site Location:
The subject site is located adjacent to Middle Rifle Creek approximately 1.5 miles North of County Road
245 at the confluence with West Rifle Creek in Garfield County, Colorado. The site is situated in Section
25, T 4 S, R 93 W of the 6'h P.M. The Site comprises approximately 300+ acres on moderately sloped
ranchlands surrounded by mountainous areas with pinyon, juniper, sagebrush, and oakbrush landscape.
The main developed portion of the site (Ranch Compound) comprises approximately 20 acres, which
contains the redevelopment projects, existing ranch buildings, livestock facilities and other ranch
improvements. The site is a working ranch with agricultural fields, residential buildings,
utility/agricultural buildings and associated ranch type improvements.
Existing Site Conditions:
Approximately 80% of the 20 -acre ranch compound portion of the site is located on relatively flat to
moderately sloping agricultural lands along Middle Rifle Creek. The majority of the site slopes to the West
toward Middle Rifle Creek. The existing ground surfaces in the proposed re -development areas are on
relatively flat ground with approximate slopes between 2% and 10%. The site is covered with lawns,
pasture grasses, sagebrush, scrub oak, Pinion trees and shrubs. Domestic water is supplied by an existing
well.
Proposed Site Conditions:
Several redevelopment projects are underway at the ranch including replacement of the bunkhouse,
relocation of an existing cabin and construction of a new main ranch house and new bam/studio. It is our
understanding that you intend to remodel the existing cottage. The proposed improvement will include a
new ISDS system to replace the existing one.
This proposed individual ISDS systems is separated in excess of a 100 feet separation from the other
prosposed system or recently installed system. The 5 proposed systems are hydrological separate and
distributed over a total area of 16 acres. No overlapping influence between systems is expected to occur
throughout the life of the systems. The site contains adequate area for replacement and/or upgraded
systems in the far future.
Subsurface Conditions:
Attached are the results of the subsurface investigation and percolation tests conducted on March 6, 2001
by CTL Thompson, Inc. (CTL) for Area 5. The CTL report is dated March 12, 2001 Job Number GS -
3170. The subsoil encountered at the site consists of approximately 6 inches of clayey sand topsoil, with
silty sand to depths of 5-6 feet overlying gravel, cobbles and boulders. Groundwater was not encountered
to a depth of 12 feet in the test profile pit.
Steve Eichhorst
SE Job No. 201 10.01
March 20, 2001
Page 3
Percolation testing, in the four individual preferred absorption areas, utilized four test holes yielded varying
absorption rates. The fastest measured rate was 15 minutes per inch and the slowest measured rate was 30
minutes per inch. The average test percolation rate of 20 is used to design the individual absorption areas.
Additional evaluation of on site soils will be performed at the time of construction to determine the need
for possible soil replacement in the final staked out location of the trenches. This is necessary to insure
that the effluent will be evenly distributed in the trenches and percolate into the suitable filter media at an
acceptable loading rate.
Design Criteria:
The existing cottage is a 1 -bedroom cabin. Garfield County regulations require a minimum design flow
based on 2 bedrooms. Therefore, we propose the minimum installation of a system based on two
bedrooms for area 5. This recommendation is practical with respect to future needs of the current owners
and the needs of potential new owners of the home site if the property is sold in the future.
The design flows for Area 5 is calculated as follows:
Residence unit - 2 bedrooms @ 2 person /bedroom = 4 person
From the Garfield County I. S. D. S. Regulation;
Max. Design flow (Qd) = # of people x 1.5(avg. flow) gal/person/day.
Gallons per day for Area 5 = 75 gal/person/day
PUMA PAW RANCH
AREA ISDS QUANTITIES Number People/ /capita Avg. Rate Peaking Design
Bedrooms Bedroom Usage OA Factor OD
# gpd/cap gpd # gpd
EXISTING
2 COTTAGE 1 (min. 2) 2 75 300 1.5 450
Septic Tank Design:
Residence
V = Qd x Dt = gallons
Qd = Design flow (gal/day)
Volume (V) of tank (gallons)
Dt = (30 hour retention time) = 1.25 day
V = Qd * 1.25 = Tank volume
Use minimum 1000 -gallon concrete septic tank
* A 750 -gallon concrete septic tank is acceptable if available.
Percolation Test Design Criteria:
Steve Eichhorst
SE Job No. 20110.01
March 20, 2001
Page 4
Attached with this report are the percolation test results for Area 5. The results of percolation testing in
Areas 5 indicated the average percolation rate of 20 minutes per inch. However it is noted that the actual
size of the trenches is determined by a minimum desired loading rate of 1.20 gallSF/day. Additional
evaluation will be performed at these areas to determine if select filter media needs to be placed to insure
that the desired loading rate and adequate distribution is achieved. The engineer will make
recommendations regarding final design modifications based on additional field inspections at the time of
construction. The absorption trenches in the area is sized by using the standard absorption area equation
and a long-term acceptance rate, whichever is greater. A soil absorption trench disposal system with
gravity distribution and effluent filter is recommended for each ISDS system on the site.
Absorption Field System Design:
The system is designed to treat and dispose of effluent in the natural ground utilizing detention with
filtration and gravity distribution to absorption trenches. The system will also incorporate a flow
distribution system that incorporates a flow splitter basin (distribution box) for equal distribution of the
effluent between the individual absorption trenches.
The design calls for absorption trench chambers to increase storage and absorption area thus allowing a
reduction in overall area of 40%. Effluent filters shall be installed on the outlet in the secondary chamber
of each septic tank.
The average percolation rate in the proposed absorption area is listed in the following table and reported in
minutes per inch.
Based upon the average percolation test rate, the standard absorption area equation yields:
A (SF) = * t 1 ): where A = Area; Q = flow (gal/day)
5 t = time in minutes per inch
Utilizing graveness absorption chambers the area is reduced by 40%.
A(reduce) = A x 0.60 = design trench area in square feet.
Thus: A(reduce) (SF) = (Od x (t) 1) x 0.60
5
This equation will give a recommended minimum absorption area:
However the design is based on the standard absorption area equation or a long-term acceptance rate,
whichever is greater.
Therefore: Calculate Area utilizing the Long Term Acceptance Rate (LTAR) of 1.20 gallons per
square foot per day:
A = Qd / LTAR = Od gaUday = See table
r
Steve Eichhorst
SE Job No. 20110.01
March 20, 2001
Page 5
1.20 gal/SF/day
Apply gravelless Chamber reduction of 40%.
A(reduce) = A x (0.60) = See table
The minimum excavation to accommodate the chambers would be a 3' wide trench. An individual
chamber unit is approximately 6.25 feet long.
The engineer, prior to excavation shall approve final layout and design of the proposed absorption trenches.
This approval is necessary to insure that adequate slopes for gravity distribution are achieved and that soil
conditions are optimal for design loading rates and distribution.
Effluent Distribution System:
A gravity distribution system will be utilized to transport effluent from the septic tank to the absorption
chambers. An effluent filter will be installed in the secondary compartment of the septic tank to reduce
the biological loading to the absorption trenches and extend the Life of the treatment media in the trenches.
A 4" transport line will discharge effluent to a flow splitter basin installed up -gradient and adjacent to the
trenches. In multiple trench systems, the effluent will be equally distributed from the flow splitter basin
through individual discharge pipes to each trench in the system. The discharge pipes will incorporate
perforated risers in the flow splitter basin to insure equal distribution into each discharge pipe. The
discharge pipes will connect to the head of each chamber row. A splash plate shall be installed on the
trench bottom below each trench inlet to prevent scouring.
General Notes:
1) All materials and installation practices shall conform to the State of Colorado and Garfield County
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.
3) Add a two-way clean out on the service line from the proposed building to the septic tank in each
individual absorption system.
4) The system shall be plumbed to distribute effluent into the trenches with equal distribution.
5) The systems that have multiple trenches shall incorporate a flow distribution system that incorporates a
flow splitter basin (distribution box) for equal distribution of the effluent between the individual
absorption trenches.
Absorption Area Calculations
Absorption Trench Layout
Area
No.
2
ISDS Locations
Cottage
Design Average
OD Percrate
gpd mirzrnch
450 20
Absorption Minimum
Field Area Load Rate
sf gal/sf/day
402 1.2
Absorption Use 40%
Min. area Larger Area Reduction
sf sf sf
375 403 240
No. of No. of Chambers/
Chambers Trenches Trench
# # 0
14 2 7
The minimum excavation to accommodate the chambers would be a 3' wide trench. An individual
chamber unit is approximately 6.25 feet long.
The engineer, prior to excavation shall approve final layout and design of the proposed absorption trenches.
This approval is necessary to insure that adequate slopes for gravity distribution are achieved and that soil
conditions are optimal for design loading rates and distribution.
Effluent Distribution System:
A gravity distribution system will be utilized to transport effluent from the septic tank to the absorption
chambers. An effluent filter will be installed in the secondary compartment of the septic tank to reduce
the biological loading to the absorption trenches and extend the Life of the treatment media in the trenches.
A 4" transport line will discharge effluent to a flow splitter basin installed up -gradient and adjacent to the
trenches. In multiple trench systems, the effluent will be equally distributed from the flow splitter basin
through individual discharge pipes to each trench in the system. The discharge pipes will incorporate
perforated risers in the flow splitter basin to insure equal distribution into each discharge pipe. The
discharge pipes will connect to the head of each chamber row. A splash plate shall be installed on the
trench bottom below each trench inlet to prevent scouring.
General Notes:
1) All materials and installation practices shall conform to the State of Colorado and Garfield County
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.
3) Add a two-way clean out on the service line from the proposed building to the septic tank in each
individual absorption system.
4) The system shall be plumbed to distribute effluent into the trenches with equal distribution.
5) The systems that have multiple trenches shall incorporate a flow distribution system that incorporates a
flow splitter basin (distribution box) for equal distribution of the effluent between the individual
absorption trenches.
I
Steve Eichhorst
SE Job No. 20110.01
March 20, 2001
Page 6
6) The contractor shall ensure that the septic tank and sewer lines are watertight.
7) The absorption trench areas must be protected to prevent damage from vehicular or livestock traffic.
8) The chambers shall be installed level in each trench. Cobbles or rocks are to be removed from the
trench if encountered.
9) The chambers may be backfilled with native soil free of rocks.
10) A final cover of soil suitable for vegetation, a minimum 12" deep, shall be placed from the top of the
chambers to the finished surface grade.
11) The trench finished surfaces must be crowned to direct surface drainage away from the trench to
minimize surface infiltration.
12) The absorption trenches must be sodded or covered with vegetative ground cover.
13) A vertical 4" inspection port shall be installed in the pre -molded cut out on the mid -point of the
terminal end chamber of each trench.
14) Gravelless chambers shall be installed level according to the manufacturer recommendations.
15)An approved effluent filter shall be installed on the outlet in the secondary chamber of each septic tank.
16) The effluent transport lines from the building to the tank and tank to the absorption trenches shall be
installed with a minimum 1% slope.
17) The engineer will determine recommendations regarding final design modifications based on additional
field evaluations.
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 ISDS. If the County Environmental Health Department requests
changes or modifications to this design, we should be contacted to evaluate the effect on the ISDS.
If you have any question or need any additional information, please call.
Sincerely,
SOPRIS ENGINEERING, LLC
Paul E. Rutledge
Design Engineer
a,Y.a a yjw` `tic lb
u "W
Nichol, P.F
June 20, 2001
Steve Eichhorst
B & H Contractors, Inc.
Puma Paw Ranch
174 Flying Fish Road
Carbondale, CO 81623
Dear Steve:
RECEIVED JUN 2 6 2001
RE: ISDS As -Built Documentation for Puma Paw Ranch —ISDS Systems Area 1 & 5, West Rifle
Creek, Garfield County, CO
SE Job No. 20110.01
Pursuant to your request, this letter provides documentation that the new ISDS systems recently installed is in
general compliance with the permitted designs. Two of the five proposed systems are now complete. The Barn
Studio (Area 1) was completed last fall and the existing cottage (Area 5) was completed this spring. Both dwellings
include a single bedroom with an ISDS installed to serve the minimum 2 -bedroom design requirement. Sopris
Engineering has performed visits to inspect and document the as built conditions of the constructed systems. We
have coordinated our efforts with the contractor that built the systems. The as built conditions and installation of the
new ISDS components is in compliance with the permitted design specifications for the two individual systems.
The Barn Studio (Area 1) was installed in accordance with Garfield County Regulations; the design presented in the
Sopris Engineering Report and the design drawings, dated November 29, 2000. A 1000 gallon dual compartment
septic tank was installed with 4" tee baffles and an effluent filter. The absorption field was modified by constructing
2 trenches from the single trench delineated on the site plan. An inspection port was installed on the end of the two
44 foot long trenches installed. The trenches were installed level utilizing specified materials installed according to
design. The minimum setback distances have been maintained.
The Existing Cottage (Area 5) was installed in accordance with Garfield County Regulations; the design presented
in the Sopris Engineering Report and the design drawings, dated March 20, 2001. A 1000 gallon dual compartment
septic tank was installed with 4" tee baffles and an effluent filter. The absorption constructed with 2 trenches as
delineated on the site plan. An inspection port was installed on the end of the two 44 foot long trenches installed.
The trenches were installed level utilizing specified materials installed according to design. The minimum setback
distances have been maintained.
If you have any questions or need additional information please give me a call.
Sinter ;iSlti i:ILpp�«�
SO ��l , LLC
�4?O��arC �•a i 1
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tit
jchol, P.E. •F
hii/S° N�� F'.r'+rm m 1ton
Garfield County Building Department
Priri
Cc:
j^V
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
SOPRIS ENGINEERING •LLC
civil consultants
\a .
INDIVIDUAL SEWAGE DISPOSAL SYSTEM 7;4 Ce4e4t
APPL CAT ONN��
APtel
Pu..1
A ?A Li LLC_
DRESSii
wA'fut
r-ou 1-31/m1 , 11,1 {e .z. PHONE (z Ig‘) 4z- 4704
NTRACTOR 1ST r\ 4E --AL- 6.3 0-1-ga crn )5
DRESS 174 Ftp x- hsr t?o CA,=-tc.,>ak ca 3,bz3 PHONE (c.no) 96z.-8639
kMIT REQUEST FOR QC NEW INSTALLATION ( ) ALTERATION ( ) REPAIR
ich separate sheets or report showing entire area with respect to surrounding areas, topography of area, habitable
ding, location of potable water wells, soil percolation test holes, soil profiles in test holes (See page 4).
CATION OF PROPOSED FACILITY-
ir what City of Town K 1 FLE Co 8l6' o Size of Lot 35 -
;al
;al Description or Address 1793 6°0..7/ 1`> 219 , iFLE co g11,5o
�STES TYPE y4 DWELLING ( ) TRANSIENT USE
( ) COMMERCIAL OR INDUSTRIAL ( ) NON-DOMESTIC WASTES
( ) OTHER - DESCRIBE
TIMING OR SERVICE TYPE. $ * vnA‘P tiouSE_
mber of Bedrooms Number of Persons IO
xl Garbage Grinder (?c) Automatic Washer ( 9 Dishwasher
'URCE AND TYPE OF WATER SUPPLY QQ WELL ( ) SPRING ( ) STREAM OR CREEI
>upplied by Community Water, give name of supplier:
STANCE TO NEAREST COMMUNITY SEWER SYSTEM:
as an effort made to connect to the Community System?
site plan is required to be submitted that indicates the following MINIMUM distances:
!ach Field to Well: 100 feet
-ptic Tank to Well: 50 feet
each Field to Irrigation Ditches, Stream or Water Course: 50 feet
.ptic System to Property Lines: 10 feet
OUR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT WILL NOT BE ISSUED WITHOU
SITE PLAN.
ROUND CONDITIONS:
?.pth to first Ground Water Table
:rcent Ground Slope
2:
2
PE ('7 INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED.
) SEPTIC TANK ( ) AERATION PLANT ( ) VAULT
' i 'VAULT PRIVY ( ) COMPOSTING TOILET ( ) RECYCLING, POTABLE USE
)' PIPPRIVY ( ) INCINERATION TOILET ( ) RECYCLING, OTHER USE
CHEMICAL TOILET ( ) OTHER - DESCRIBE
IAL DISPOSAL BY:
ABSORPTION TRENCH, BED OR PIT ( ) EVAPOTRANSPIRATION
UNDERGROUND DISPERSAL ( ) SAND FILTER
ABOVE GROUND DISPERSAL ( ) WASTEWATER POND
OTHER - DESCRIBE
LL EFFLUENT BE DISCHARGED DIRECTLY LNTO WATERS OF THE STATE?
RCOLATION TEST RESULTS: (To be completed by Registered Professional Engineer, if the Engineer does thi
colation 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.
me, address and telephone of RPE who made soil absorption tests: 945-z&o0
ATL / t}ko PSot-) INC Z�11- Gia-E,Z pr��v c Cr WS Ce albut
.me, address and telephone of RPE responsible for design of the system: 7 04 -
o?v(rl CPa I -t -z 5�l nnAS-,- r x A4 , cc e.Ibz S
plicant acknowledges that the completeness of the application is conditional upon such further mandatory an
iitional tests and reports as may be required by the local health department to be made and furnished by the applicar
by the local health department for purposed of the evaluation of the application; and the issuance of the permit
bject to such terms and conditions as deemed necessary to insure compliance with rules and regulations mad(
brmation and reports submitted herewith and required to be submitted by the applicant are or will be represented t
true and correct to the best of my knowledge and belief and are designed to be relied on by the local department
alth in evaluating the same for purposes of issuing the permit applied for herein. I further understand that ar
sification or misrepresentation may result in the denial of the application or revocation of any permit granted base
ion said application and in legal action for perjury as provided by law.
Fed
Zf!,
4— Cr -t\ Date iP•3f cS
/-+ AM
_EASE DRAW AN ACCURATE MAP TO YOUR PROPERTY!!
3
July 23, 2001
Steve Eichhorst
13. & 11 Contractors, Inc.
Puma Paw Ranch
174 Flying Fish Road
Carbondale, CO 81623
RE: ISDS As -Built Documentation for Puma Paw Ranch —ISDS Systems Area 2, West Rifle
Creek, Garfield County, CO
SE Job No. 20110.01
Dear Steve:
Pursuant to your request, this letter provides documentation that the new ISDS system "Area 2" recently installed is
in general compliance with the permitted design. Three of the five proposed systems are now complete. The
Remote Cottage (Area 2) was completed this spring. The dwelling includes a single bedroom with an ISDS installed
to serve the minimum 2 -bedroom design requirement. Sopris Engineering has performed visits to inspect and
document the as built conditions of the constructed system. We have coordinated our efforts with the contractor
that built the system. The as built conditions and installation of the new ISDS components is in compliance with the
permitted design specifications for the system.
The Relocated Cottage (Area 2) was installed in accordance with Garfield County Regulations; the design presented
in the Sopris Engineering Report and the design drawings, dated November 29, 2000. A 1000 gallon dual
compartment septic tank was installed with 4" tee baffles and an effluent filter. The absorption field was constructed
with 2 trenches as delineated on the site plan. An inspection port was installed on the end of the two 44 foot long
trenches installed. The trenches were installed level utilizing specified materials installed according to design. The
minimum setback distances have been maintained.
If you have any questions or need additional information please give me a call.
Sincerely,
SOPRIS
tit 4.
Yanc3 hol, P.E. JQ
Yom°• •��,•
Prior CP.sqoLs.'°°°r5••401 /0ry`�
tlk
Cc: Garttri K WI\ty Building Department
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
SOPRIS ENGINEERING LLC
civil consulta its
02/02/2084 11:50 970-704-0313
SOPRIS EN5:NEERING PAGE 01
FAX Transmittal
70: Tim Holliday
UMW Garfield County Building Department
Fax#: 384 3470
Dint 2-2-04
Toto het 2
SE Minna 20110
aem: Paul Rutledge
MesseM& Attached is the Puma Paw OWS As -Built Letter for Area 3- Bunk
House & Area4— Main House systems
o Original not to follow
0 Original to follow by mail
0 Original to he delivered by messenger
0 Original to be picked up
502 main street • suite A3 • Carbondale, CO 81623 • (970; 704-0311 • tax (970) 704-0313
SOPRIS ENGINEERING • LLC
civil consultants
02/02/2004 11:50 970-704-0313
SOPRIS ENGINEERING
PAGE 02
August 6, 2001
Steve Eichhorst
B & H Contractors, Inc.
Puma Paw Ranch
5317 County Road 154, Suite 206
Glenwood Springs, CO 81601
RE: ISDS As -Built Documentation for Puma Paw Ranch —ISDS Systems Area 3 & 4, West Rifle
Creek, Garfield County, CO
SE Job No. 20110.01
Dear Steve:
Pursuant to your request, this letter provides documentation that the new ISOS systems recently installed is in
general compliance with the permitted designs. All five of the proposed systems are now complete. The Bunk
House (Area 3) was completed this summer and the Main Building (Area 4) was completed just recently this
summer. Sopris Engineering has performed visits to inspect and document the as built conditions of the constructed
systems. We have coordinated OUT efforts with the contractor that built the systems. Both systems were inspected
prior to backfilling and after all installations were completed. The as built conditions and installation of the new
ISDS components is in compliance with the permitted design specifications for the two individual systems.
The Bunk House (Area 3) was installed in accordance with Garfield County Regulations; the design presented in the
Sopris Engineering Report and the design drawings, dated November 29, 2000. A 1000 gallon dual compartment
septic tank was installed with 4" tee baffles and an effluent filter. The absorption field was installed by constructing
2 trenches in the location delineated on the site plan. Inspection ports were installed on the ends of the two 63 foot
long trenches installed. The trenches were installed level utilizing specified materials installed according to design.
The minimum setback distances have been maintained.
The Main Building (Area 4) was installed in accordance with Garfield County Regulations; the design presented in
the Sopris Engineering Report and the design drawings, dated November 29, 2000. A 1500 gallon dual
compartment septic tank was installed with 4" tee baffles and an effluent filter. The absorption field was constructed
with 4 trenches in the location delineated on the site plan. The trenches were installed with 4" perforated
distribution laterals that run 85 feet along each trench surface to the inspection port at the midpoint of the end
chambers. Inspection ports were installed at the midpoints on the end chambers of the four 88 foot long trenches
installed. The trenches were installed level utilizing specified materials installed according to design. The
minimum setback distances have been maintained.
If you have any questions or need additional information please give me a call.
Since G flops),
SO ;. LC
vir
Xan�cq1ehQi,P•,Fs tv
Principe*. S10NAL,,o,
Cc: Garfield County Building Department
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
SAPRIS ENGINEERING • LLC
civil consultants
December 4, 2000
B & H General Contractors
174 Flying Fish Road
Carbondale, CO 81623
Attention: Mr. Steve Eichhorst
Subject: Percolation Testing
Puma Paw Ranch
County Road 219
Garfield County, Colorado
Job No. GS -3170
irltLtt V tU
DEC 7 2000
B&H
We performed a geotechnical investigation for the residence, bunkhouse and
barns at the site under our Job No. GS -3048 (report dated July 5, 2000). As
requested, we have performed percolation testing at the site. The approximate areas
of five proposed percolation fields are shown on Figure 1. Our investigation
included Areas 1 through 4. The location of Area 5 was not determined at the time
of our investigation and percolation testing was not performed.
Profile and percolation borings and pits were drilled and excavated by the
client at locations determined by the client. The approximate locations ofthe borings
and pits are shown on Figures 2 through 5. Graphic logs of the soils and bedrock
encountered in the borings and pits are shown on Figure 6. Sandstone bedrock was
encountered just below the ground surface in Profile 1 (Figure 2). We recommended
the Area 1 percolation field be moved away from the adjacent sandstone bedrock
outcrops. The client excavated pits at the alternate location northwest of Area 1.
We performed percolation testing in the borings and pits between November
6 and 16, 2000. Test results are presented on Figures 7 through 10. Our percolatiJn
test results indicate the following design percolation rates are appropriate:
Area
Design Percolation
Rate (min/inch)
1
<5
2
5to10
3
15 to 20
4
30 to 40
ENTER :RNE
CTL/THOMPSON, INC.
CONSULTING ENGINEERS
3L=N'ACOO Sr=INCS _,cLoRc_c 9150' 1 ;70. ga5.29,0=
We recommend that the percolation fields be designed by an engineer
qualified in septic field design. We appreciate the opportunity to work with you on
this project. If you have questions, please call.
Very Truly Yours
CTLITHOMPSON, INC.
J es D. Kellogg
Staff Geotechnical Engineer
Reviewedd'
tiling,-P.E.
Manager
DK:JM:cd".
(5 copies sent)
B 8 H GENERAL CONTRACTORS
PUMA PAW RANCH
JOB NO GS -3170
2
PUMA PAW RANCH
COUNTY ROAD 219
GARFIELD COUNTY, COLORADO
0.
LEGEND:
P-1
■ Indicates location
of pit
Scale: 1"=40'
P-2
Profile 11A •
P-1
APPROXIMATE LOCATIONS OF PITS AND BORINGS
Job No. GS -3170
Fig. 2
PUMA PAW RANCH
COUNTY ROAD 219
GA'RFIELD COUNTY, COLORADO
LEGEND:
P-3
• Indicates location
of boring
Profile 2
■ Indicates location
of pit
AREA 2
Scale: 1 "=40'
Profile 2
��
j / N
APPROXIMATE LOCATIONS OF PITS AND BORINGS
Job No. GS -3170
Fig. 3
PUMA PAW RANCH
COUNTY ROAD 219
GARFIELD COUNTY, COLORADO
k
f.
LEGEND:
P-6
• Indicates location
of boring
Profile 3
■ Indicates location
of pit
Scale: 1"=40'
APPROXIMATE LOCATIONS OF PITS AND BORINGS
Job No. GS -3170
Fig. 4
PUMA PAW RANCH
COUNTY ROAD 219
GARFIELD COUNTY, COLORADO
Scale: 1n=40'
P-1
PPP-1� irP-10
LEGEND:
P-9
• Indicates location
of boring
Profile 4
APPROXIMATE LOCATIONS OF PITS AND BORINGS
Job No. GS -3170
Fig. 5
SATURATION AND PREPARATION
DATE: 11/13100
TIME AT START OF SATURATION: 4:30 pm
PERCOLATION TEST
DATE: 11/15100
WATER IN BORING AFTER 24 HOURS
YES X NO
PERCOLATION TEST RESULTS
HOLE
NUMBER
DEPTH
(INCHES)
TIME AT
START OF
INTERVAL
TIME
DEPTH TO WATER
CHANGE
IN WATER
DEPTH
(INCHES)
PERCOLA-
TION RATE
(MIN/INCH)
INTERVAL
(MINUTES)
START OF
INTERVAL
(INCHES)
END OF
INTERVAL
(INCHES)
P-1
96
10:00
30
12.0
20.0
8.0
4
10:30
30
11.0
20.0
9.0
3
11:00
30
12.0
19.5
7.5
4
11:30
30
13.25
24.0
10.75
3
12:00
30
11.25
19.25
8.0
4
12:30
30
12.0
20.0
8.0
4
1:00
30
12.0
19.5
7.5
4
1:30
30
12.0
20.0
8.0
4
P-2
92
10:00
30
10.25
18.25
8.0
4
10:30
30
9.5
16.0
6.5
5
11:00
30
10.25
15.25
5.0
6
11:30
30
9.0
15.0
6.0
5
12:00
30
8.75
13.75
5.0
6
12:30
30
9.5
15.5
6.0
5
1:00
30
9.75
15.75
6.0
5
1:30
30
10.25
15.25
5.0
6
Job No. GS -3170
Fig. 7
SATURATION AND PREPARATION
DATE': 11113/00
TIME AT START OF SATURATION: 4:30 pm
PERCOLATION TEST
DATE: 11116/00
WATER IN BORING AFTER 24 HOURS
YES X NO
PERCOLATION TEST RESULTS
HOLE
DEPTH
TIME AT
TIME
DEPTH TO WATER
CHANGE
PERCOLA-
NUMBER
(INCHES)
START OF
INTERVAL
INTERVAL
(MINUTES)
START OF
INTERVAL
(INCHES)
END OF
INTERVAL
(INCHES)
IN WATER
DEPTH
(INCHES)
TION RATE
(MIN/INCH)
P-3
39
10:30
30
21.0
26.25
5.25
6
11:00
30
20.5
25.0
4.5
7
11:30
30
19.75
24.25
4.5
7
12:00
30
20.0
24.5
4.5
7
12:30
30
19.5
23.25
3.75
8
1:00
30
18.0
22.75
4.75
6
P4
36
10:30
30
17.0
21.25
4.25
7
11.00
30
17.0
20.75
3.75
8
11:30
30
16.5
20.0
3.5
9
12:00
30
15.25
19.75
4.5
7
12:30
30
15.5
18.75
3.25
9
1:00
30
14.5
18.75
4.25
7
P-5
44
10:30
30
26.0
31.5
5.5
5
11:00
30
26.0
30.75
4.75
6
11:30
30
25.25
30.0
4.75
6
12:00
30
24 75
29.75
5.0
6
12:30
30
24.5
28.75
4 25
7
1:00
30
23.75
28.75
5.0
6
1
L
I
Job No. GS -3170
Fig. 8
SATURATION AND PREPARATION
DATE: 11/06/00
TIME AT START OF SATURATION: 11:00 am
PERCOLATION TEST
DATE: 11;07700
WATER IN BORING AFTER 24 HOURS
X YES (P-2) X NO (PA and P-3)
PERCOLATION TEST RESULTS
HOLE
DEPTH
TIME AT
TIME
DEPTH TO WATER
CHANGE
PERCOLA-
TION RATE
(MIN/INCH)
NUMBER
(INCHES)
START OF
INTERVAL
INTERVAL
(MINUTES)
START OF
INTERVAL
(INCHES)
END OF
INTERVAL
(INCHES)
IN WATER
DEPTH
(INCHES)
P-6
35
8:15
60
20.25
26.75
6.5
9
9:15
60
26.75
30.0
3.25
18
10:30
60
*17.0
23.75
6.75
9
11:30
60
23.75
27.5
3.75
16
12:30
30
27.5
29.5
2.0
15
P-7
39
8:15
60
23.50
31.5
8.0
8
9:15
60
31.50
34.5
3.0
20
10:30
60
'22.25
29.5
7.25
8
11:30
60
29.5
32.75
3.25
18
12:30
30
32.75
34.25
1.5
20
P-8
37
8:15
60
18.75
28.0
9.25
7
9:15
60
28.0
31.0
3.0
20
1030
60
*18.75
25.75
7.0
9
11:30
60
25.75
29.5
3.75
16
12:30
30
29.5
31.5
2.0
15
i
indicates water added to holes
Job No. GS -3170
Fig. 9
SATURATION AND PREPARATION
DATE: 11/06/00
TIME AT START OF SATURATION: 11:00 am
PERCOLATION TEST
DATE: 11/07/00
WATER IN BORING AFTER 24 HOURS
YES X NO
PERCOLATION TEST RESULTS
HOLE
NUMBER
DEPTH
(INCHES)
TIME AT
START OF
INTERVAL
TIME
DEPTH TO WATER
CHANGE
IN WATER
DEPTH
(INCHES)
PERGOLA -
TION RATE
(MIN/INCH)
INTERVAL
(MINUTES)
START OF
INTERVAL
(INCHES)
END OF
INTERVAL
(INCHES)
P-9
35.5
8:45
60
18.0
24.0
6.0
10
9:45
60
24.0
27.5
3.5
17
10:45
60
27.5
29.5
2.0
30
11:45
60
29.5
31.5
2.0
30
12:45
30
31.5
32.5
1.0
30
P-10
38
8:45
60
22.5
27.75
5.25
11
9:45
60
27.75
30.5
2.75
22
10:45
60
30.5
32.0
1.5
40
11:45
60
32.0
33.5
1.5
40
P-11
32
8:45
60
17.0
22.0
5.0
12
9:45
60
22.0
25.0
3.0
20
10:45
60
25.0
26.75
1.75
34
11:45
60
26.75
28.25
1.5
40
12:45
30
28.25
29.0
0.75
40
P-12
32
8:45
60
16.0
21.0
5.0
12
9:45
60
21.0
24.0
3.0
20
10:45
60
24.0
26.0
2.0
30
11:45
60
26.0
27.5
1.5
40
12:45
30
27.5
28.25
0.75
40
I
1
Job No. GS -3170
Fig. 10
November 29, 2000
Steve Eichhorst
B & H Contractors. Inc.
Puma Paw Ranch
174 Flying Fish Road
Carbondale. CO 81623
RE: Puma Paw Ranch — Proposed ISDS Systems. West Ritle Creek. Garfield County. CO
SE Job No. 20110.01
Dear Steve:
Pursuant to your request. attached herewith is a Tetter/report presenting our findings in regard to the
feasibility and design for Individual Sewage Disposal Systems (ISDS) at the above referenced Site. This
design is based on our evaluation of the site conditions with information provided by others for use in
supporting your application to Garfield County. Our recommendations are in accordance with Garfield
County and the State of Colorado ISDS Regulations. We have reviewed the information forwarded to us.
conducted a site visit, formulated ISDS designs and created a site plan with construction details as part of
our scope of work. Supporting documentation including percolation test results and the geotechical report
are attached.
Conclusions:
The site contains 4 separate areas in which individual systems need to be installed to serve the needs of the
re -development on the ranch. Based on our findings we believe that the design and installation of
approved ISDS systems is feasible in accordance with the Regulations of Garfield County and the State of
Colorado. The following table summarizes the components of the four individual systems.
Area
ISDS Locations
Number
Bedrooms
#
Use tank
Volume
gal
Absorption
Min. area
SF
1
BARN STUDIO
1 (min. 2)
1000
225
2
REMOTE COTTAGE
1 (min. 2)
1000
225
3
BUNK HOUSE
2
1000
300
4
MAIN BUILDING
5
1500
854
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax
(970) 704-0313
SOPRIS ENGINEERING LLC
civil consultants
Stege Eichhorst
SE Job No. 201 10.01
Nov ember 29, 2000
Page 2
We recommend that new. dual compartment, concrete septic tanks be installed that will discharge effluent
to soil absorption trench systems. The soil absorption systems will consist of graveless absorption
chambers installed in 3' wide by 2' deep trenches. The effluent will discharge to absorption chambers
installed in natural soils. We have proposed the addition of an effluent filter in the secondary camber of
each septic tank. The filtered effluent will discharge to single trench systems or to flow splitter basins via a
4" PVC pipe installed with a minimum 2% slope. The effluent will be equally distributed to multiple
trench systems from flow splitter basins through individual discharge pipes to each trench in each system.
The individual systems will meet all required setbacks and will be installed within the general location
indicated on the plan. Our design calculations are outlined below and delineated on the attached plans and
details.
Site Location:
The subject site is located adjacent to Middle Rifle Creek approximately 1.5 miles North of County Road
245 at the confluence with West Rifle Creek in Garfield County, Colorado. The site is situated in Section
25, T 4 S, R 93 W of the 6`" P.M. The Site comprises approximately 300+ acres on moderately sloped
ranchlands surrounded by mountainous areas with Pinyon. Juniper, sagebrush, and oakbrush landscape.
The main developed portion of the site (Ranch Compound) comprises approximately 20 acres, which
contains the redevelopment projects, existing ranch buildings. livestock facilities and other ranch
improvements. The site is a working ranch which agricultural fields, residential buildings.
utility/agricultural buildings and associated ranch type improvements.
Existing Site Conditions:
Approximately 80% of the 20 -acre ranch compound portion of the site is located on relatively flat to
moderately sloping agricultural lands along Middle Rifle Creek. The majority of the site slopes to the West
toward Middle Rifle Creek. The existing ground surfaces in the proposed re -development areas are on
relatively flat ground with approximate slopes between 2% and 10%. The site is covered with lawns.
pasture grasses, sagebrush, Scrub Oak, Pinion trees and shrubs. Several driveways, water storage tank and
buried utility services have been installed on the site. Domestic water is supplied by existing wells, on the
property near the southeast boundary line. The well is located approximately 300 feet down gradient and
500 feet horizontally from the building site.
Proposed Site Conditions:
Several redevelopment projects are underway at the ranch including replacement of the bunkhouse.
relocation of an existing cabin and construction of a new main ranch house and new barn/studio. It is our
understanding that you intend to demolish two existing bunkhouses, vehicle barn, storage shed and pool
house. The proposed improvements will include new 1SDS systems separated by adequate distances to
preclude any hydraulic influence between systems.
The proposed individual ISDS systems are separated in excess of a minimum 100 feet separation distance.
The minimum distance between absorption fields in Area 3 and Area 4 is 220 feet. The minimum distance
between absorption fields in Area 1 and Area 4 is 331 feet. The minimum distance between absorption
Steve Eichhorst
SE Job No. 201 10.01
• • November 29. 2000
Page 3
fields in Area 2 and Area is 616 feet. The 4 proposed systems are hydrological separate and distributed
over a total area of 16 acres. No overlapping influence between systems is expected to occur throughout
the life of the systems. The site contains adequate area for replacement and/or upgraded systems in the far
future.
Subsurface Conditions:
Attached herewith are the results of the subsurface investigation and percolation tests conducted on
November 7,15 and 16 2000 by CTL Thompson. Inc. (CTL). The CTL report is dated December 4. 2000,
Job Number GS -3170. The subsoil encountered at the site consists of approximately 6 inches of clayey
sand topsoil overlying silty gravels in Area 1 and 2 and silty to clayey sand in areas 3 and 4. Groundwater
was not encountered to a depth of 10 feet in the test profile pits in each area.
Percolation testing, in the four individual preferred absorption areas. utilized four test holes yielded varying
absorption rates. The fastest measured rate was 5 minutes per inch and the slowest measured rate was 40
minutes per inch. The average test percolation rate at each area is used to design the individual absorption
areas.
Additional evaluation of on site soils will be performed in Area 1 and Area 2 at the time of construction to
determine the need for possible soil replacement in the final staked out location of the trenches. This is
necessary to insure that the effluent will be evenly distributed in the trenches and percolate into the suitable
filter media at an acceptable loading rate. We expect that percolation rates at 2 to 3 feet below the surface.
in these two areas. will be slower that the rates reported in percolation test holes 1 through 5.
Design Criteria:
Proposed residence is a 1 -bedroom house. Garfield County regulations require a minimum design flow
based on 2 bedrooms. Therefore, we propose the minimum installation of a system based on two
bedrooms for area 1 and 2. This recommendation is practical with respect to future needs of the current
owners and the needs of potential new owners of the home site if the property is sold in the future. The
system for Area 3 (bunkhouse) is based on a design flow rate of 50 gpd for up to 8 persons housed in 2
bedrooms. The system for Area 4 (Main ranch house) is based on a design flow rate based on 5 bedrooms.
The design flows for Areas 1,2 and 4 are calculated as follows:
Residence unit - 2 bedrooms @ 2 person !bedroom = 4 person
From the Garfield County I. S. D. S. Regulation;
Max. Design flow (Qd) = # of people x 1.5(avg. flow) gal/person/day.
Gallons per day for Areas 1.2 and 4 = 75 gal/person/day
Steve Eichhorst
SE Job No. 20110.01
November 29. 2000
Pale 4
The design flows for Areas 3 are calculated as follows:
Residence unit - 2 bedrooms i. 4 person /bedroom = 8 person
From the Garfield County I. S. D. S. Regulation;
Max. Design flow (Qd) = # of people x 1.5(avg. flow) gal/person/day.
Gallons per day for Areas 3 = 50 gal/person/day
See the table below for calculated design flows for each ISDS system.
PUMA PAW RANCH
AREA ISDS QUANTITIES Number People/ /capita Avg. Rate Peaking Design
Bedrooms Bedroom Usage QA Factor QD
# gpd/cap gpd # gpd
1 BARN STUDIO 1 (min. 2) 4 75 300 1.5 450
2 REMOTE COTTAGE 1 (min. 2) 4 75 300 1.5 450
3 BUNK HOUSE 2 8 50 400 1.5 600
4 MAIN BUILDING 5 10 75 750 1.5 1125
Septic Tank Design:
Residence
V = Qd x Dt = gallons
Qd = Design flow (gal/day)
Volume (V) of tank (gallons)
Dt = (30 hour retention time) = 1.25 day
V = Qd * 1.25 = Tank volume
Use minimum 1000 -gallon concrete septic tank
PUMA PAW RANCH Minimum Septic Tank Size
Area ISDS Locations Design min. Time min. Tank Use tank
OD Detention Volume Volume
gpd hr gal gal
1 BARN STUDIO 450 1.25 563 1000*
2 REMOTE COTTAGE 450 1.25 563 1000*
3 BUNK HOUSE 600 1.25 750 1000
4 MAIN BUILDING 1125 1.25 1406 1500
* A 750 -gallon concrete septic tank is acceptable if available.
Stete Eichhorst
SE Job No. 201 10.01
November 29. 2000
Page 5
Percolation Test Design Criteria:
Attached with this report are the percolation test results from a series of test dated December 4. 2000. The
results of percolation testing in Areas 1 and 2 indicated the average percolation rate of 4.7 and 7 minutes
per inch respectively. These tests were performed at depths below the design depth at the bottom of the
trenches. We expect that percolation rates at 2 to 3 feet below the surface. in these two areas. will be
slower that the rates reported in percolation test holes 1 through 5. However it is noted that the actual size
of the trenches is determined by a minimum desired loading rate of 1.20 gal/SF/day. Additional evaluation
will be performed at these areas to determine if select filter media needs to be placed to insure that the
desired loading rate and adequate distribution is achieved. The engineer will make recommendations
regarding final design modifications based on additional field evaluations. The absorption trenches in all
the separate areas are sized by using the standard absorption area equation and a long-term acceptance rate.
whichever is greater. A soil absorption trench disposal system with gravity distribution and effluent filter
is recommended for each ISDS system on the site.
Absorption Field Svstem Design:
The systems are designed to treat and dispose of effluent in the natural ground utilizing detention with
filtration and gravity distribution to absorption trenches. The proposed habitable living units will
incorporate all water saving fixtures to ensure the conservation of water resources from the well. The
finish floor elevation of the buildings will be set to accommodate gravity discharge of effluent from the
buildings through the tank to the absorption trenches. The systems that have multiple trenches will also
incorporate a flow distribution system that incorporates a flow splitter basin (distribution box) for equal
distribution of the effluent between the individual absorption trenches.
The design calls for absorption trench chambers to increase storage and absorption area thus allowing a
reduction in overall area of 40%. Effluent filters shall be installed on the outlet in the secondary chamber
of each septic tank.
The average percolation rates in the proposed absorption areas are listed in the following table and reported
in minutes per inch.
Based upon the average percolation test rate. the standard absorption area equation yields:
A (SF) = (Q *(t) ): where A = Area: Q = flow (gal/day)
5 t = time in minutes per inch
Utilizing graveness absorption chambers the area is reduced by 40%.
A(reduce) = A x 0.60 = design trench area in square feet.
Thus: A(reduce) (SF) = (Qd x (t) 1/2) x 0.60
5
This equation will give a recommended minimum absorption area:
See Table for calculated results in each area.
Steve Eichhorst
SE Job No. 20110.01
November 29. 2000
Page 6
However design is based on the standard absorption area equation or a long-term acceptance rate.
whichever is greater.
Therefore: Calculate Area utilizing the Long Term Acceptance Rate (LIAR) of 1.20 gallons per
square foot per day:
A = Qd / LTAR = Qd gal/dav = See table
1.20 gal/SF/day
Apply gravelless Chamber reduction of 40%.
A(reduce) = A x (0.60) = See table
Use 15.5 SF / chamber to determine number of chambers per absorption area.
Use the above layouts or modify to ensure minimum trench areas with equal distribution.
The minimum excavation to accommodate the chambers would be a 3' wide by 2-3- deep trench. An
individual chamber unit is approximately 6.25 feet long.
The engineer, prior to excavation shall approve final layout and design of the proposed absorption trenches.
This approval is necessary to insure that adequate slopes for gravity distribution are achieved and that soil
conditions are optimal for design loading rates and distribution.
Absorption Area Calculations
Absorption Trench Layout
Area
ISDS Locations
Design Average
Absorption Minimum
Absorption Use 40%
No. of No. of Chamber;
No.
QD Percrate
Field Area Load Rate
Min. area Larger Area Reduction
Chambers Trenches Trench
i
gpd min/inch
sf gal/sf/day
sf sf sf
4 4 4
i 1
Studio
450 4.7
195 1.2
375 375 225
15 1 15
i 2
Cottage
450 7
238 1.2
375 375 225
15 1 15
3
Bunk House
600 14
449 1.2
500 500 300
19 2 10
4
Main House
1125 40
1423 1.2
938 1423 854
55 4 14
Use the above layouts or modify to ensure minimum trench areas with equal distribution.
The minimum excavation to accommodate the chambers would be a 3' wide by 2-3- deep trench. An
individual chamber unit is approximately 6.25 feet long.
The engineer, prior to excavation shall approve final layout and design of the proposed absorption trenches.
This approval is necessary to insure that adequate slopes for gravity distribution are achieved and that soil
conditions are optimal for design loading rates and distribution.
Steve Eichhorst
SE Job No. 201 10.01
November 29. 2000
Page 7
Effluent Distribution System:
A gravity distribution system will be utilized to transport effluent from the septic tanks through the length
of the absorption chambers. An effluent filter will be installed in the secondary compartment of the septic
tanks to reduce the biological loading to the absorption trenches and extend the life of the treatment media
in the trenches. A 4" transport line will discharge effluent to the single trench or. in multiple trench
systems. to a flow splitter basin installed up -gradient and adjacent to the trenches. The 4" PVC transport
lines will be installed with a minimum 2% slope. In multiple trench systems, the effluent will be equally
distributed from the flow splitter basin through individual discharge pipes to each trench in the system.
The discharge pipes will incorporate perforated risers in the flow splitter basin to insure equal distribution
into each discharge pipe. The discharge pipes will connect to the head of each chamber row. A splash
plate shall be installed on the trench bottom below each trench inlet to prevent scouring. Due to the higher
design flow rate in area 4 (Main ranch house) the addition of distribution laterals is recommended. Each
row of chambers in area 4 will have a perforated distribution lateral that runs the entire length of the trench
and installed at the top of the chambers. The perforations in the pipe will be oriented to discharge the
effluent downward.
General Notes:
1) All materials and installation practices shall conform to the State of Colorado and Garfield County
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.
3) Add a two-way clean out on the service line from the proposed building to the septic tank in each
individual absorption system.
4) The system shall be plumbed to distribute effluent into the trenches with equal distribution.
5) The systems that have multiple trenches shall incorporate a flow distribution system that incorporates a
flow splitter basin (distribution box) for equal distribution of the effluent between the individual
absorption trenches.
6) The contractor shall ensure that the septic tank and sewer lines are watertight.
7) The absorption trench areas must be protected to prevent damage from vehicular or livestock traffic.
8) The chambers shall be installed level in each trench. Cobbles or rocks are to be removed from the
trench if encountered.
9) The chambers may be backfilled with native soil free of rocks.
10) A final cover of soil suitable for vegetation, a minimum 12" deep, shall be placed from the top of the
chambers to the finished surface grade.
1 I) The trench finished surfaces must be crowned to direct surface drainage away from the trench to
minimize surface infiltration.
12) The absorption trenches must be sodded or covered with vegetative ground cover.
13) A vertical 4" inspection port shall be installed in the pre -molded cut out on the mid -point of the
terminal end chamber of each trench.
14) Gravelless chambers shall be installed level according to the manufacturer recommendations.
Steve Eichhorst
SE Job No. 201 10.01
No\ ember 29.2000
Page 8
15) An approved effluent filter shall be installed on the outlet in the secondary chamber of each septic tank.
16) The effluent transport lines from the building to the tank and tank to the absorption trenches shall be
installed with a minimum 2% slope.
I7) The engineer will determine recommendations regarding final design modifications based on additional
field evaluations.
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 ISDS. If the County Environmental Health Department requests
changes or modifications to this design. we should be contacted to evaluate the effect on the ISDS.
If you have any question or need any additional information, please call.
Sincerely,
SOPRIS ENGINEERING, LLC
Paul E. Rutledge
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