HomeMy WebLinkAbout03726I
I
l
"
• t
GARFIELD COUNTY BUILDING AND SANITATION DEPARTMENT Permit N!; 3726 i
109 8th Street Suite 303 AsseHor's Parcel No. t
Glenwood Springs, Colorado 81601
Phone (303) 945·6212 ------1
i ( '1:' This does not constitute
INDIVIDUAL SEWAGE DISP~OSAL PERM(IT .,. /lP '--,/\; '\ {!._. '
1
~ng or use permit.
PROPERTY ~-;·v·'A· /J ~\ ~ ' ' · 11 ' · ·, ' -1 \D £ ,;u 6 \r"cif t?A-
owner·s Nam~ I \O Cf'f$~UC1Present Addressl 06'1 C.: Phon.a%'-9 3J7
System Locatlon48$9 CQ.cQ/~'))Q C ~uk§$
I
'I ~
I
' !
:i
t
..
y
!, Legal Description of Assessor's Parcel No.------------~---~-----~~--+------i, f;,,~~ s;:,~ A ~ J.\
r
l
I
l
l
' I
t
i
• l
• l
I
1
!
!
L
I
~
I
I
~
I
' ,
1,
' I
I •
SYSTEM DESIGN . C/o"
_____ Septic Tank Capacity (gallon) ______ Other
_____ Percolation Rate (minutes/inch} Number of Bedrooms (or other) ____ _
Required Absorption Area -See Attached
Special Setback Requirements:
' • l
I
l
4
!
'
i
'' ' Date ____________ Inspector __________________________ ........ 'I
FINAL SYSTEM INSPECTION AND APPROVAL (es Installed)
Call for Inspection (24 hours notice) Before Covering Installation
System Installer ____________________________________ ~-
' .{ • ' ; l
I
!
Septic Tank Capacity '" ··1 -------------------------------------.
' Septic Tank Manufacturer or Trade Name------------------------------i
..... -...
Septic Tank Access within 8" of surface ------------------------------
Absorption Area _____________________________________ _
Absorption Area Type and/or Manufacturer or Trade Name ------------------------
, ' Adequate compliance with County and State regulations/requirements ___________________ _ i
::::· /0-3/-o 1-inspector By hu,-p1~,L-L '-!/,cnias 4. (I ronk Pt.1
RETAIN WITH RECEIPT RECORDS AfcONSTRUCTION SITE -=IP J_ g 3 2.'.. 2-' !
•CONDITIONS:
1. All installation must comply with all requlremehts of the Colorado State Board of Health Individual Sewage Disposal Systems Chapter
25, Article 10 C.R.$. 1973, Revised 1984. ·
2. This permit Is valid only for c.pnnection to strUctUres which have fully complied with County zonlnO and building requirements. Con~
nection to or use with any dwellihg or struct.ures not approved by the Building and Zoning office shall automatically be a violation or a
requirement of the pe~_mltand. cause for both legal action and revocation of the permit.
3. Any person who constructs, alters, or Installs an lndlvldual se'wage disposal system In a manner which Involves a knowlng 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) .
Whhe. APPLICANT Yellow. DEPARTMENT
l
I
' I
\
I
I
I
I
970 242 5330 P.02
t '-' • Jf 40 JI ...... L..--.._...,.._........._,, I I I L.. I o L.. •
INDIVIDUAL SEWAGE DISPOSAL SYSTEM APPLICATION
OWNER \,,}I f t "X A 'N'\S. J"RO J> OC.T X 011. >
PHONE ;?85 -9377
CONfRACTOR_-L.-t=--'-------------------~~------
ADDRESS 15 5 5 I ..ol ep e,..,,cl..e "'± .fve
PERMIT REQUEST FOR (~ NEW INSTALLATION ( )ALTERATION ( )REPAIR
Attach separate sbeeta or report showing entire area with respect to 111rrounding areas, topography of area, habitable
building, location of potable water wells, soil percolation test bolos, soil profiles in test holes (See page 4).
LOCAIION OF PROPOSED FACILITY
Near what City of Town. l'AR.A.C'°'\) rtr Sjr.e of Lot 7 + Ac rs:;
I..epl Description or Address Y2 8'1 Cop"-.1,.>I l2 as ..l 2 15
WASTES TYPE ( ) DWELLING ( ) TRANSIENT USE
(~ COMMERCIAL OR INDUSTRIAL ( ) NON-DOMESTIC WASTES
( ) OTHER-DESCRIBE. ___ ~--~~----~-~~
BUILDING OR SER VICE TYPE:
NumberofBedrooms~__,O==--~---~-----Number of Persons ---=Z.=-----
( ) Dishwasher ( ) GaJbage Grinder ( ) Automatic Washer
SOURCE AND TVPE OF WATER Sl!PPLY. ( ) WELL ( ) SPRING ( ) STREAM OR CREEK
If supplied by Community Water, give name of supplier: _______________ _
DISTANCE TO NEAREST COMMUNITY SEWER SYSTEM: _ __,,/""l>-'"'<n.:.J' lc.,.~--------
Was an effort made to connect to the Community System? _ __,,u..,'-----------· __ _
A site plap Is rqall'!d to ft sphm!tted that lmljgf!s the foUgwlv MINIMUM distances;
I
I
'
' t
~
·I
Leach Fidll to WeU; JOO feet ~·
Septic Tank to Well: 50 feet
Leach Field to lrrlg:adon Ditches, Stream or Water Course: 50 feet ~
SeptkSy1temtoPnpertyUna:(septic tank &leach field)18feet ~
YOUR INDMDVAL SEWAGE PISfOSALSl'STEM PEBMITWJLLNOI BE ISSUER WITHOUT ~
ASITEfLAN.
GROUND CONDWQNS:
Depth to first Ground Water Table l
Percent Ground Slope __________________________ _
2
970 242 5330 P.03
TYPE OF rNDIVU>UAL SEWAGE DISPOSAL SYS'mM PROPOSED:
(X) SEPTIC TANK ( ) AERATION PLANT ( ) VAULT
( ) VAULT PRIVY ( ) COMPOSTING TOILET ( ) RECYCLING, POT ABLE USE
( ) PIT PRIVY ( ) INCINERATION TOILET ( ) RECYCLING, OTHER USE
( ) CHEMICAL TOILET ( ) OTIIER • DESCRIBE
FINAL DISPOSAL BY:
(.I<) ABSORPTION TRENCH, BED OR PIT ( ) EV APOTRANSPIRATION
( ) UNDERGROUND DISPERSAL ( ) SAND FILTER
( ) ABOVE GROUND DISPERSAL ( ) WASTEWATER POND
( ) OTHER -DESCRIBE
WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE7 _ _.M""'~"-----
PERCQLATION TESI RESULT$: (To be completed by Registel"ed Professional Engineer, if the Engineer does the
Percolation Test) ~££ J>t:~s.'N (S~1"e ft.A-NJ
Minutes. ____ _,..er. inch in hole No. I
Minutes per inch in hole No. 2
Minutes----.per inch in hole NO. 3
Mlnutes'---·----1per inch in hole NO._
Name, address and telephone ofRPE who made soil absorption tests: ______________ _
Name, address and telephone ofRPE responsible for design of the system: ____________ ·-··-·
Applicant acknowledges that the completeness of the application is conditional upon such further mandatory and
ldditional tests and reports as may be required by the loc:al 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 i111Ua11Ce of the permit is
111bject to such terms and conditions as deemed necessary to insure compliance with rules and regulations made,
information and reports IUbmined herewith and required to be submitted by the applicant are or will be represented to
be true and correct to the best or my knowledge and belief and are designed to be relied on by the loc:e1 department or
health in evaluating the same for purposes of issuing the pamit applied for herein. l further undentand that any
filsification or misrepresentation may result in the denial of the application or revocation of my permit gnmted based
upon said application and in legal action for petjury as provided by law.
s~ /;?/~
PLEASE Dlt.AW AN ACCURATE MAP TO YOUR PROPERTY!!
3
.•
I
l
l
I
,l
'
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
CRONK
CONSTRUCTION
INCORPORATED
• 1129 ·24· Road
Grand Junction, CO 81505
970·245·0577, 970·257·7453 (fax)
Date:
Prepared by:
Type of Design:
Client:
Property address:
Tax schedule No.:
Legal Descript:
INDIVIDUAL SEWAGE DISPOSAL SYSTEM DESIGN
June 30, 2002
Thomas A. Cronk, P.E.
Cronk Construction Inc.
1129 -24-Road
Grand Junction, CO 81505
245-0577
New Commercial Office
TPI Industrial Inc.
1551 W. Independent Ave.
Grand Junction, CO 81505
970-243-4642(wk)
Williams Production -Parachute Creek Gas Plant, 4289 County Road 215,
Parachute, CO 81635
Page I of9
~------------------------------------------------------------------------------~~~~~~~~~~~~
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
1.0 Site History
The site consists ofa parcel of uncultivated native soil in excess of I acre in size. The site has been
construction-leveled in the area ofreference. A percolation test/soils evaluation was conducted on the
property ofreference on 06/25/02 by an agent of Tom A. Cronk, registered professional engineer
(R.P.E.). The 06/25/02 site investigation was intended to provide subsurface design parameters for a new
individual sewage disposal system (ISDS) to serve a commercial office at the site.
An engineered ISDS design based on results from the 06125102 study has been prepared for the property.
The 06/25/02 site investigation report is attached for reference as Appendix A. The locations of the perc
excavations are shown on the attached plot plan. A discussion of developed design parameters and the
engineered design follow.
2.0 Development of Design Parameters
Aperc excavation trench (excavation A) was extended to a depth of 120" below ground surface (BGS).
There was no evidence of ground water in the open excavation to a depth of 120" BGS. The high
seasonal water table was estimated at a depth of 100" BGS. The soils evaluation indicates two distinct
soil horiwns underlie the site. A lithological description follows:
depth (in.)
0". 76 11
76" -120"
description
mixture of fine sand, silt, coarse to small sandstone cobbles with lenses of
sandstone chips
silty clay
As based on the 06/25/02 site investigation (Appendix A), a design perc rate of 80 min/in. is chosen for
overall system sizing.
Page 2 of9
I
I
1•
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
3.0 System Design
A trench absorption field is proposed for discharge of septic effluent at the site. As shown in the
attached graphics, the absorption field will consist of four trenches 2' wide and 51' long. The trenches
will be excavated to a depth of 48". After excavation, 36" of gravel fill (1.0"-2.5" screened rock with
aggregate components of uniform size) will be used to construct a level seepage bed in each trench.
Adjacent trenches shall be separated by a minimum horizontal distance of6' (10'-12' separation
recommended for ease of construction) of undisturbed soil.
Septic effluent distribution piping in the absorption field will consist of a 4" perforated discharge line
placed level (end-to-end) down the center of each trench. As shown in the attached graphic, the
perforated line will terminate 18" from the ends of each trench. The perforated line will be embedded in
the gravel seepage fill with a minimum of 30" of gravel under, and 2" of gravel over each pipe. Ends of
the perforated line will be looped with solid piping to adjacent trenches. As shown in the attached
graphics, septic effluent will be delivered from the septic tank to each of the four trenches through a
distribution box to provide equal distribution. The distribution box must be placed on stable native soil
or compacted structural fill to prevent settling and assure equal distribution of septic effluent.
Native soil will be used to fill the remaining 12" of trench excavation and construct a soil cap over the
absorption field. Before placing the soil cap, synthetic filter fabric ("myrafi", 140-200 mesh), hay, or
untreated building paper will be placed over the gravel bed to prevent intrusion of fine soils. The native
soil backfill will be mounded 5% over each trench to promote surface flow runoff in the vicinity of the
absorption system.
The installer should confirm the feasibility of gravity discharge of sewage effluent from the existing
septic tank to the absorption field by field verification of assumed design parameters. Assumed design
parameters with respect to gravity discharge include:
• distance from the sewage pipe at exit from the foundation line to the absorption field -
200' or less,
• elevation of the ground surface at entry to the absorption field shall be at least 30" below
the invert elevation of the sewage pipe at exit from the foundation line.
If field measurements do not confirm these design assumptions, gravity discharge of sewage effluent
from the office to the absorption field can not be assured and a lift pump may be required. Please contact
the design engineer to address any design modifications necessary for effective operation of the ISDS if
the above design assumptions are not upheld.
The installer must also confirm the setbacks from property lines, building envelopes, and existing
easements shown in the attached graphics are maintained. Additionally, any unknown utility lines,
easements, or other adverse conditions disclosed during construction must maintain the required setbacks
listed on page 6 of this document. Four inch clean outs shall be installed at maximum 100' intervals in all
effluent lines exceeding 100' in length.
The ISDS will be sized for sewage flows from a 1350 sq. ft. office (14 person). Average sewage flow
from a 14 person office is estimated at 15 gal/employee-8 hr shift or 210 gal/day average total flow. The
allow for future expansion, the ISDS will be sized to handle an average daily sewage loading of 300
Page 3 of9
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
gal/day.
A 1,000 gallon septic tank is required for septic effluent discharged at the design daily flow rate. A non-
corrodible filter shall be installed at the final outlet Tee of the septic tank or in the effluent line between
the septic tank and the absorption field to limit the size of solids and sludge passing into the absorption
field. The filter must be accessible for cleaning and replacement from the ground surface.
A distribution box is required to provide equal distribution of septic effluent from the septic tank to the
absorption field. The distribution box must be placed on stable native soil or compacted structural fill to
prevent settling and assure equal distribution of septic effluent.
As discussed above, a trench absorption field is proposed to discharge septic effluent to the underlying
sub-soils. As shown in the attached graphics, the absorption field will consist of four trenches, each 2 ft
wide, 48 in. deep, and 51 ft long. The trenches will be filled with 36" of gravel to provide an effective
infiltration area of 816 square feet. Calculations and design parameters used to size the absorption field
follow.
Page 4 of9
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
DESIGN CALCULATIONS
DESIGN AVERAGE SEWAGE DISCHARGE FLOW OF 300 GAL.IDAY
PEAK FLOW= 150% OF AVERAGE = 450 GAL.IDAY
DESIGN PERCOLATION RATE = 80.0 MIN./INCH
A = Q{t WHERE
5 ' '
A = ABSORPTION FIELD AREA
Q =PEAK FLOW
t = PERC TIME/INCH
A = 45 o /80.0 = 804.98 SQUARE FEET
5
DESIGN AREA = 804.98 SQUARE FEET
UNADJUSTED TRENCH LENGTH = DESIGN AREA = 804 ·98 = 402.49
TRENCH WIDTH 2
ADJUSTED TRENCH LENGTH = UNADJUSTED TRENCH LENGTH X ( W + 2 ) ,
W +I +2(D)
WHERE,
W = WIDTH OF TRENCH (FT.)
D = DEPTH OF TRENCH BELOW PIPE (FT.)
ADJUSTED TRENCH LENGTH = 402.49 X ( 2 + 2 ) = 201.25
2 +I +2(2.5)
DESIGN TRENCH LENGTH= 4 TRENCHES@ 51 1 EACH= 2041
Page 5 of9
- - - - - - - - - - - - - - - - - - - - - - - - - - - -------------- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --------
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
4.0 Site Specific Installation/Operation Requirements
The owner and system contractor shall be aware and comply with the following installation and system
operation requirements.
4.1 Installation -Setbacks. Notifications. and Inspections
•
•
•
•
All installation activities shall be conducted in accordance with current Colorado
Department of Health ISDS Regulations as well as any relevant Garfield County
regulations and requirements. If at any time during construction. subsurface site
conditions are encountered which differ from the design parameters developed in Section
2.0. construction activities will stop and the design engineer will be contacted to address
any necessary design modifications.
Installation procedures including grade, location, setbacks, septic tank size, and
absorption field size shall conform with the attached graphic details. Construction
activities and system components will not encroach upon existing easements or utility
corridors. A minimum of 6 ft of undisturbed soil shall be maintained between individual
absorption elements and the septic tank and/or adjacent absorption elements. Minimum
site specific setbacks for system components are:
Source Se11tic Tank Absomtion Field Building Sewer
water line 10' 25' 10'
occupied bldng 5' 20'
property lines 10' 10'
subsoil drains 10' 25'
irrigation ditch
open 50' 50'
lined/gated 25 25'
solid pipe 10' 10'
To avoid surface flow infiltration and saturation of the new absorption system,
abandonment of irrigation in the vicinity of the disposal system is required. Diversion
ditches necessary to divert surface flows around the new absorption bed must maintain
the minimum setbacks listed above.
All sewer lines and effluent distribution piping shall be 4 inches in diameter, have glued
joints, and shall be looped at termination of discharge. Septic tank effluent lines shall be
placed level in the absorption field. All lines discharging sewage from the office to the
septic tank shall maintain fall of between 1/8 in. and 1/4 in. per foot and shall employ
sweep 90's or 2-45's at all turns. Sewer lines from the office to the septic tank and at
least 6 ft from the septic tank outlet must meet minimum standard ASTM-3034. Sewer
lines under driveways shall always meet minimum Schedule 40 PVC standards and shall
be encased with corrugated metal pipe when covered with less than 24" of soil.
Page 6 of9
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
•
•
•
•
•
•
The installer shall not place fill in the open excavation until inspected and approved by
the design engineer. Additionally, the final cover shall not be placed on sewer lines,
septic tank, or the absorption area until the system has been inspected and approved by
the design engineer. The installer shall provide 48 hour notice to the engineer for all
required inspections.
Four inch clean outs shall be installed at maximum 100' intervals in all effluent lines
exceeding 100' in length.
A non-corrodible filter shall be installed at the final outlet Tee of the septic tank or in the
effluent line between the septic tank and the absorption field to limit the size of solids
and sludge passing into the absorption field. The filter must be accessible for cleaning
and replacement from the ground surface.
The distribution box shall be set level on undisturbed native soil or a structural pad (e.g.,
compacted fill or concrete) to prevent settling and promote uniform distribution of flow
to the absorption field. A 45 degree bend shall be turned down on the septic influent line
to damp surge flows from the septic tank and promote equal distribution.
The seepage trenches shall be constructed with a 36 in. layer of 1.0 in. to 2.5 in. screened
rock spread evenly over each trench. The effluent distribution lines will be placed level
in the seepage beds with 30" of gravel under, and 2" of gravel over each line. A covering
of untreated building paper, hay, straw, or synthetic filter fabric (e.g., "myrafi", 140-200
mesh) shall be placed on top of the gravel absorption trenches before placing the surface
cap. The surface cap shall be mounded 5% over the absorption trenches to promote
surface runoff.
The system contractor shall be aware of the potential for construction activities to reduce
soil permeabilities at the site through compaction, smearing, and shearing. The
following precautions and construction procedures should be employed during
installation to minimize disturbance to native soils:
i. Excavation should proceed only when the moisture content of the soil is below
the plastic limit. If a sample of soil forms a rope instead of crumbling when
rolled between the hands it is too wet and should be allowed to dry before
excavation continues.
ii. Excavation and backfill equipment should work from the surface where at all
practical to avoid compaction of the soils at depth.
iii. The bottom and sidewalls of the excavation should be left with a rough, open
surface. The appearance should be that of broken or ripped soil as opposed to a
sheared, smeared, or troweled surface. Any smoothed or smeared surfaces
should be removed with a toothed rake or shallow ripper taking care to remove
loose residues from the bottom of the excavation by hand if necessary.
iv. Care should be taken in placing fill materials in the excavation to avoid
damaging the exposed soil surfaces.
Page 7 of9
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
4.2 Operation -Maintenance and htspections
• The owner shall install a structural barrier if necessary and take precautions to prevent
vehicular traffic, excessive surface watering, accidental flooding, or other activities in
the vicinity of the absorption field which may compact, saturate, or otherwise alter the
subsurface soil parameters used in designing the septic system.
• The owner will plant and maintain grass or other shallow rooted cover crop to prevent
erosion and promote evapotranspiration over the absorption field.
• The owner will inspect and maintain the required mounding and drainage away from the
absorption field to prevent saturation from precipitation and surface flows.
• To mitigate the generation of preferential flow channels which may compromise the
operation of the system, the owner will inspect and prevent intrusion of burrowing
animals and deep rooted plants into the absorption field.
• The septic effluent filter shall be inspected and cleaned as necessary every six (6)
months.
• The owner will conduct periodic maintenance of the septic system by removing
accumulated sludge from the septic tank every 3-4 years to prevent clogging of the
absorption field.
Page 8 of9
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
------------------------------------------------------------~~~~~~~~~~-
5.0 Limitations
This report is a site specific design for installation of an individual sewage disposal system and is
applicable only for the client for whom our work was performed. Use of this report under other
circumstances is not an appropriate application of this document. This report is a product of Cronk
Construction Incorporated and is to be taken in its entirety. Excerpts from this report may be taken out of
context and may not convey the true intent of the report. It is the owner's and owner's agents
responsibility to read this report and become familiar with the recommendations and design guidelines
contained herein.
The recommendations and design guidelines outlined in this report are based on: I) the proposed site
development and plot plan as furnished to Cronk Construction Incorporated by the client, and 2) the site
conditions disclosed at the specific time of the site investigation ofreference. Cronk Construction
Incorporated assumes no liability for the accuracy or completeness of information furnished by the client.
Site conditions are subject to external environmental effects and may change over time. Use of this plan
under different site conditions is inappropriate. If it becomes apparent that current site conditions vary
from those anticipated, the design engineer should be contacted to develop any required design
modifications. Cronk Construction Incorporated is not responsible and accepts no liability for any
variation in assumed design parameters.
Cronk Construction Incorporated represents this report has been prepared within the limits prescribed by
the owner and in accordance with the current accepted practice of the civil engineering profession in the
area. No warranty or representation either expressed or implied is included or intended in this report or
in any of our contracts.
SEAL
Thomas A. Cronk, P.E.
;,{,,*'' ./ ~
Date~~()) ZGV Z,
NOTE: This individual sewage disposal plan Is meant to Include the following three pages of
graphics Including: 1) plot plan, 2) septic layout plan, and 3) construction details (absorption field
plan view, and absorption field cross section). The plan Is not to be Implemented in the absence of
these related graphics. In addition, results from the percolation test and soils evaluation are
Included for reference as Appendix A.
Page 9 of9
- -- -- --
~I~ -0
" M 0
ti I r----i~
>-~2'----i45·~·30.,1 ~ . c
0
0 u
0
~
;;,
<(]
~
L
~I
• > ·c
"
____Jw)
)
/
0 5000 go.tlon
~ water tank
' '
oreo. in
vicinity of
perc test
ho.s loeen
l'IO.n Leveled
- - -
approx. 515'
cD n/oerc test JJ ,JJ locations
puMping stations
puMplng sto. ti ans
--
I
- ----J
-
0
0
~
x
0
L a a
0
-- --
YILLIAMS PRODUCTION PROJECT~
PARACHUTE CREEK GAS PLANT
4289 COUNTY ROAD 215
PLOT PLAN
-
JUNE 25, 2002
SCALE: 1'=100' NORTH
-
-
• > ·;:
""
------- -
opprox. 515'
office
<45'x30')
/cloan
lO'l'lin.i__
out
distribution box
ITJ
' ~"<'"
I
I
/
/
/
I
)
)
0 5000 go.tlon
wo.ter tonk
' ' ~
1000 gallon septic tank
w/eff\uen"t Filter
clean out,
o.s rE"quired
NOTE
CALL 1-800-922-1987 FDR UTILITY
LOCATES BEFORE EXCAVATING
NOTE
ABANDON FLOOD IRRIGATION
'WITHIN 50' OF ANY ISDS
ELEMENT, TYPICAL
NOTE
PROVIDE 4• CLEAN OUTS AT MAXIMUM
100' INTERVALS IN ALL EFFLUENT
LINES EXCEEDING 100' IN LENGTH
! c
£
0
--- - -
4 t"'e..,ches, ea.ch 2' wide x
4' deep x 51' \ong f'i\\ed
with 3' of gro.vet
'---perc test
loca.tions
~ UJtE
pul'lping stations
puMping sto:tions
'WILLIAMS PRODUCTION PROJECT~
PARACHUTE CREEK GAS PLANT
4289 COUNTY ROAD 215
SEPTIC LAYOUT PLAN
JUNE 25, 2002
SCALE: 1'=50' NORTH
---- -
.---------~ l
I I
I I I I I
I repair area I
l -"L,,_l
NOTE
GRAVITY DISCHARGE OF SE'w'AGE
EFFLUENT FROM THE RESIDENCE
TO THE DISPOSAL SYSTEM IS
BASED ON THE FDLLO'w'JNG DESIGN
ASSUMPTIONS=
LENGTH OF SE'w'AGE PIPING
FROM EXIT AT FOUNDATION
LINE TO ENTRY TO ABSORPTION
FIELD = 200' OR LESS
ELEVATION OF GROUND SURFACE
AT ENTRY TO ABSORPTION FIELD
= AT LEAST 30' BELO'w' INVERT
ELEVATION OF SE'w'AGE PIPE AT
EXIT FROM FOUNDATION LINE
DISC! AIMER
IF" THESE DESIGN ASSUMPTIONS ARE
NOT UPHELD DURING CONSTRUCTION,
GRAVITY DISCHARGE CAN NOT BE
ASSURED AND A LIFT STATION MAY
BE REQUIRED 0
0
" " 0 c
0
0
d
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
-SEPTIC
INFLUENT
'------''----------------___,'-------+--' I2'
2' \./IDE X 4' DEEP X 51' LONG
TRENCH FILLED 'w'ITH 3' OF GRAVEL
4• PERFORATED EFFLUENT
DISTRIBUTION LINE
6' MIN., 10'-12' REFERRED, TYP.
-W-18' SOLID PIPING FROM END OF
TRENCH TD TRANSITION TO
PERFORATED DISTRIBUTION LINE, TYP.
ABSORPTION TRENCH -PLAN VIEi{
SCALE• !';!O'
LOOP SOLID
PIPING AT ENDS
SOIL CAP <MOUND 5%>
NATIVE SOIL BACKFILL
EXISTING GROUND SURFACE
12' SYNTHETIC FILTER FABRIC, HAY, OR
UNTREATED BUILDING PAPER OVER GRAVEL
4• PERFORATED DISTRIBUTION LINES, TYP.
<MINIMUM or 2· GRAVEL OVER)
2'X3' GRAVEL SEEPAGE TRENCH
Cl.0'-2.5' SCREENED ROCK)
4
L~ _ _J
6'Min.~ ltoo·
10'-12' PREFERRED
--H-IG~ ~A~ V~T~R TABLE~ -
i--24·1.
•t
-76'
ff2
ABSORPTION TRENCH -CROSS SECTION CTYPICAU
SCALE• 1•;5•
-120·
SOILS LOG
<SEE NOTES>
\i/ILLIAMS PRODUCTION PROJECT
PARACHUTE CREEK GAS PLANT
4289 COUNTY ROAD 215
CONSTRUCTION DETAIL
JUNE 25, 2002
SOILS LOG NOTES
10 -MIXTURE OF FINE SAND, SILT, SANDSTONE
GRAVEL TO COBBLES TO BOULDERS \ii/SANDSTONE
CHIPS IN LENSES
#2 -CLAY \.//SOME SILT
NO EVIDENCE OF GROUND 'w'ATER TD 1(~0';
HIGH SEASONAL 'w'ATER TABLE ESTIMATED AT 100'
I
I
I
11
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
APPENDIX A
SOILS AND PERCOLATION REPORT
CRONK CONSTRUCTION INCORPORATED
,I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
CRONK
CONSTRUCTION
INCORPORATED
• 1129 ·24· Road
Grand Junction, CO 81505
970·245·0577, 970·257·7453 (fax)
Date:
Prepared by:
Client:
Property address:
Tax schedule No.:
Legal Descript.:
1.0 Soils Evaluation
SOILS AND PERCOLATION REPORT
June 25, 2002
Thomas A. Cronk, P.E.
1129 -24-Road
Grand Junction, CO 81505
245-0577
TPI Industrial Inc.
1551 W. Independent Ave.
Grand Junction, CO 81505
(970) 243-4642
Williams Production -Parachute Creek Gas Plant
4289 County Road 215, Parachute, CO
The site consists of a parcel of uncultivated native soil in excess of 1 acre in size. The site has been
construction-leveled in the area ofreference. A percolation test/soils evaluation was conducted on the
property ofreference on 06/25/02 by an agent of Tom A. Cronk, registered professional engineer
(R.P.E.).
Aperc excavation trench (excavation A) was extended to a depth of 120" below ground surface (BGS).
There was no evidence of ground water in the open excavation to a depth of 120" BGS. The high
seasonal water table was estimated at a depth of 100" BGS. The soils evaluation indicates two distinct
soil horizons underlie the site. A lithological description follows:
depth (in.l
O" ~ 76"
76" -120"
description
mixture of fine sand, silt, coarse to small sandstone cobbles with lenses of
sandstone chips
silty clay
Pere holes were constructed in excavation A at the surface and at depths of approximately 60 in. and 80
in. Additional perc holes were constructed in excavation B at a depth of 48 in., and in excavation C at a
depth of 60 in. The holes appeared to be well saturated at the time of the test. Results of the percolation
Page A-I of A-3
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
test are shown in Table I.
TABLEl
Percolation Test Results
4289 Count-..• Road 215
Depth Time on 06125102 Time Pere
Drop Rate
14:55 15:25 15:55 min/in
(A\ O" 2.25 4.5 6.5 60/4.25 14
fA\ 60" 3.75 5.25 6.5 60/2.75 22
(A\ 80" 2.75 3.0 3.5 6010.15 80
(B) 48" 5.0 5.5 6.0 6011.0 60
fCl 60" 3.25 3.25 3.75 6010.5 120
2.0 Conclusions and Recommendations
Soils at the site appear acceptable for implementation of an individual sewage disposal system (!SOS).
The following site-specific considerations should be observed during implementation of the ISDS:
• The bottom of the ISDS absorption field should be located no deeper than 52" BGS to
maintain 4' of usable infiltration soil above the HSWT located at 100" BGS. A design
perc rate of 80 min/in. is recommended for overall system sizing.
• Care should be taken during construction to avoid compaction and smearing of the
exposed infiltrative surfaces and preserve the natural permeability of the native soils.
Page A-2 of A-3
I
I
I
I
'I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
3.0 Limitations
This report provides a professional assessment of the feasibility of implementing an individual sewage
disposal system on the property ofreference. The design parameters developed in this document are
representative of the site conditions disclosed at the specific time of the site investigation. Site
conditions are subject to change from external events both manmade (irrigation or pond construction)
and naturally occurring (flooding or excessive precipitation). Cronk Construction Incorporated is not
responsible and accepts no liability for any variation in assumed design parameters caused by external
events.
Cronk Construction Incorporated represents this report has been prepared within the limits prescribed by
the owner and in accordance with the current accepted practice of the civil engineering profession in the
area. No warranty or representation either expressed or implied is included or intended in this report or
in any of our co~~~· --T--LL {§.)
Thomas A. Cronk, P.E.
~ S uJ <'.,(lb°\_
Page A-3 of A-3