HomeMy WebLinkAboutApplication- PermitGARFIELD COUNTY BUILDING AND SANITATION DEPARTMENT
108 Eighth Street, Suite 201
Glenwood Springs, Coloradof 81601
Phone (970) 945-8212
INDIVIDUAL SEWAGE DISPOSAL PERMIT
Permit
4176
Assessor's Parcel No.
oil')y1- 3-{-cro 512 -
This does not constitute
a building or use permit.
PROPERTY
Owner's Name / INtM `rt k an" airesent Address a5-3LI. ji (1-'11 + � Phone
7 �Z_ -S19 fit -(-f Ct. 1 I b `sc
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
Septic Tank Manufacturer or Trade Name
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
Other I I YA} (/'J (K -
Date I�/�f ' II -b b Inspector a k iknmGa 5 ` rmt'
RETAIN WITH RECEIPT RECORDS AT CON RUCTION SITE 2 03 Z -Z
•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 aviolation 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 fail or both)
Garfield County - ISDS Application Page 3 of 15
INDIVIDUAL SEWAGE DISPOSAL SYSTEM APPLICATION
OWNER ADDRESS c -5? 9 —7i ? 714--ere-y- - ll,c;cle /ll'Di) 6n7
PHONE Qtr Q&R �fP�
CONTRACTOR ADDRESS 'S%97,'E-
PHONE ,577,2 -XT -
PERMIT REQUEST FOR # NEW INSTALLATION ( ) ALTERATION ( ) REPAIR
Attach separate sheets or report showing entire area with respect to surrounding areas, to
of area, habitable building, location of potable water wells, soil percolation test holes, soil
test holes (See page a'
LOCATION OF PROPOSED FACILITY:
Near what City or Town 2/J J,C /c'(l).dr.ae)
Size of Lot
7, 7/ /.;f4-2:3-
Legal
.;f4-2.
Legal Description or Address 7eih /?4? 5 /9
WASTES TYPE:
() Dwelling
() Transient Use
( ) Non -Domestic Wastes
*Commercial Or Industrial
( ) Other: Describe:
BUILDING OR SERVICE TYPE:
Number of Bedrooms
Number of Persons
v
http://www.garfield-county.com/home/index.asp?page=689
2/13/2006
Garfield County - ISDS Application Page 4 of 15
() 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: /Nile
Was an effort made to connect to the Community System? 11) Yes ( ) No
http://www.garfield-county.com/home/index.asp?page=689 2/13/2006
Garfield County - ISDS Application Page 5 of 15
A site plan is required to be submitted that indicates the following MI
distances:
Leach Field to Well:
Septic Tank to Well:
100 fee
50 feet
Leach Field to Irrigation Ditches, Stream a
Water Course 50 feet
Septic System to Property Lines:
feet ??j tri 76/4y� r-
i?6-7-77 2
712 71/5. rn74F-,Ij To /—or,,cr4/ ,dr
tP,/'02 >n G'•!'• is c
YOUR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT WILL NOT BE ISSUED WI
SITE PLAN
GROUND CONDITIONS:
Depth to first Ground Water
Table Percent Ground Slope
TYPE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED:
)4 Septic Tank
() Vault Privy
( ) Pit Privy
() Aeration Plant
() Composting Toilet
() Incineration Toilet
() Vault
( )Recycling/ Potable Use
() Recycling/Other Use
http://www.garfield-county.com/home/index.asp?page=689 2/13/2006
Garfield County - ISDS Application
O Chemical Toilet
FINAL DISPOSAL BY:
Page 6 of 15
() Other — Describe:
() Absorption Trench, Bed Or Pit () Evapotranspiration
( ) Underground Dispersal ( ) Sand Filter
( ) Above Ground Dispersal O Wastewater Pond
() Other — Describe.
WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE?
PERCOLATION TEST RESULTS: (To be completed by Registered Professional Engineer,
Engineer does the Percolation Test)
Minutes
Minutes
per inch in hole No. 1 Minutes per inch in hole No.
per inch in hole No. 2 Minutes per inch in hole No.
http://www.garfield-county.com/home/index.asp?page=689 2/13/2006
Garfield County - ISDS Application Page 7 of 15
RPE WHO MADE SOIL ABSORPTION TESTS:
Name: /—A''Odif_ 7?r"-£251%7!//-ill+ 7 (l -
Address: //o2.,,9 4;k7 y , 754?c) ��2/ode -%'/'T 7i>
Telephone 97e' c «5 4
RPE RESPONSIBLE FOR DESIGN OF THE SYSTEM:
Name: /2c-?4-.-L-e ?(S ,24cfr .Z'' ZI r /
Address: //619/917e,,)� (184.169 84.1667 ` letr !42
Telephone: ' t `! cC & C97
Applicant acknowledges that the completeness of the application is conditional upon such fi
mandatory and additional tests and reports as may be required by the local health departmf
made and furnished by the applicant or by the local health department for purposed of the E
of the application; and the issuance of the permit is subject to such terms and conditions as
necessary to insure compliance with rules and regulations made. information and reports st
herewith and required to be submitted by the applicant are or will be represented to be true
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 h
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 act
perjury as provided by law.
Si
Date/ /72n-tt4,
http://www.garfield-eounty.com/home/index.asp?page=689 2/13/2006
CRONK
CONSTRUCTION •
INCORPORATED
1129 -24- Road
Grand Junction, CO 81505
970-245-0577, 970-257-7453 (fax)
September 11, 2006
CERTIFICATE OF INSPECTION AND ACCEPTANCE
Individual Sewage Disposal System
Sills Project - Schlumberger Job
Approx. 2005 CR 319
Rifle, CO 81650
The individual sewage disposal system of reference was inspected on September 11, 2006. The
system was found to conform with the plans and specifications set forth in the engineered sewage
disposal system design for the aforementioned property prepared on March 31, 2006 with the
following modification approved by the design engineer: absorption field was moved south of
the commercial building based on soils observation excavation opened to 120" BGS. Copies of
the engineered plan are on file at the Garfield County Building Department or may be obtained
from the undersigned design engineer.
Seal
Thomas A. Cronk, P.E.
1129 -24- Road
Grand Junction, CO 81505
970-245-0577
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CRONK
CONSTRUCTION
INCORPORATED
1129 -24- Road
• Grand Junction, CO 81505
970.245.0577, 970.257.7453 (fax)
INDIVIDUAL SEWAGE DISPOSAL SYSTEM DESIGN
Date: March 31, 2006
Prepared by: Thomas A. Cronk, P.E.
Cronk Construction Inc.
1129 -24- Road
Grand Junction, CO 81505
245-0577
Type of Design: Commercial
Owner:
Jimmy Sills
c/o Manan Creek Commons, LLC
45705 Highway 6&24
Glenwood Springs, CO 81601
970-947-9511
Property address: Approx. 2005 County Road 319, Rifle, CO 81650
Tax schedule No.:
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1.0 Site History
The site consists of approximately 7.91 acres of uncultivated native soil. Drainage is approximately 2%
to the east. A percolation test/soils evaluation was conducted on the property of reference on 02/01/06
by Tom A. Cronk, registered professional engineer (R.P.E.).
The perc test was intended to provide subsurface design parameters for design of an individual sewage
disposal system (ISDS) for commercial use. As based on results from this subsurface investigation, the
following ISDS design has been prepared. Results from the 02/01/06 perc test/soils evaluation are
attached for reference as Appendix A. The locations of the perc test/soils observation excavations are
shown on the attached plot plan.
2.0 Development of Design Parameters
A perc excavation trench (excavation C) was extended to a depth of 120" below ground surface (BGS).
There was no evidence of ground water or high seasonal water table in the open excavation to a depth of
120" BGS. The soils evaluation indicates three distinct soil horizons underlie the site. A lithological
description follows:
depth (in.) description
0" - 18" silty sand, light tan to tan; blocky; friable
18" - 66" clayey sand, light brown; friable; medium stiff
66" - 120" pit run (25mm-I OOmm) in Tight tan silty sand matrix
As based on the perc test results (Appendix A), a weighted design perc rate of 40 min/in. is chosen for
overall system sizing for subsurface discharge below a depth of 18".
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3.0 System Design
A INFILTRATOR absorption trench is proposed for discharge of septic effluent at the site. Construction
of the system will consist of excavating level trenches in the area comprising the absorption field. The
initial excavation shall be continued to a maximum depth of 48" (see absorption field cross-section).
Following completion of the initial push -out, INFILTRATORS will be used to construct a septic effluent
distribution system in the open excavations. The INFILTRATOR effluent distribution system will be
installed in accordance with the "Infiltrator Technical Manual", available from Infiltrator Systems Inc.,
123 Elm Street, Suite 12, Old Saybrook, Connecticut 06475. Adjacent INFILTRATORS shall be fastened
with a minimum of four (4) 3/4" x #8 self -tapping sheet metal or bright brass deck screws to prevent
movement and separation during backfilling. As shown in the Construction Detail, the bottom of the
INFILTRATOR seepage trenches will be located a maximum of 48" below ground level.
After the INFILTRATORS are installed, the absorption field will be covered with a soil cap. The soil cap
will consist of approximately 36" (10" minimum required) of native soil mounded 5% to promote surface
run off away from the absorption field.
The installer should confirm the feasibility of gravity discharge of sewage effluent from the structure to
the absorption field by field verification of assumed design parameters. Assumed design parameters with
respect to gravity discharge include:
• distance from exit of sewage pipe at foundation line to absorption field - 100' or less,
• elevation of ground surface at entry to absorption field must be no more than 12" above
the invert elevation of sewage pipe at exit from foundation line.
If field measurements do not confirm these design assumptions, gravity discharge of septic effluent from
the proposed structure can not be assured and a lift station may be required. Please contact the design
engineer to address any design modifications necessary if these 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. Vehicle traffic and parking is to be prevented
over the absorption and repair area. Provide a structural septic tank, manholes, and minimum schedule
40 PVC (encased in 6" CMP or flow fill at all areas with less than 12" of cover) under all vehicle traffic
areas. 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.
Sewage loading for the ISDS will include lavatory, water closet, and shower service for 34 employees
and customers associated with a 1,840 sq. ft. office area and 7,440 sq. ft. shop. The ISDS load sizing is
based on the maximum number of occupants for the structure as determined from the IBC building code.
Average daily sewage loadings are calculated as follows:
Sewage Source Design Loading Average Daily Sewage Flow
shop occupants @ 500 sq.ft./occupant 15 employees @ 20 gaUemployee-8 hr. shift 300 gal/day
office occupants @ 100 sq.ft./occupant 19 employees @ 15 gal/employee-8 hr. shift 285 gal/day
Total Average Daily Sewage Flow 585 gal/day
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A 1,250 gallon septic tank is required for retention of septic effluent for the proposed sewage loading. A
non -corrodible Orenco filter (model # FTW0444-36A) 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 fields. 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, INFILTRATOR absorption trenches are proposed to discharge septic effluent to the
underlying sub -soils. As shown in the attached graphics, the absorption trenches will consist of three (3)
trenches 3' wide x 4' max. deep x 75' long with twelve (12) standard INFILTRATOR units each for a total
of thirty six (36) H-10 INFILTRATORS. The absorption field will encompass a gross area of 675 square
feet with an effective area (31 sq. ft. allowed area/INFILTRATOR) of 1,116 sq. ft. Alternatively, the
absorption trenches will consist of three (3) trenches 3' wide x 4' max. deep x 76' long with nineteen (19)
QUICK4 INFILTRATOR units each for a total of fifty seven (57) QUICK4 INFILTRATORS. The
absorption field will encompass a gross area of 684 square feet with an effective area (19.74 sq. ft
allowed area/INFILTRATOR) of 1,125 sq.
Calculations and design parameters used to size the absorption field follow.
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DESIGN CALCULATIONS
DESIGN SEWAGE LOADING OF 585 GALWAY AVERAGE FLOW
PEAK FLOW = 150% OF AVERAGE = 877.50 GALJDAY
DESIGN PERCOLATION RATE = 40.0 MINJINCH
A = —Q1, WHERE,
A = ABSORPTION FIELD AREA
Q = PEAK FLOW
1 = PERC TIMEIINCH
A = 87550 40.0 = 1109.96 SQUARE FEET
SIZE ADJUSTMENT FACTOR OF 0.5 FOR INFILTRATOR TRENCH SYSTEM
ADJUSTED AREA = 1109.96 X 0.5 = 554.98 SQUARE FEET
USE 36 STANDARD (H-10) INFILTRATORS @ 15.50 SQ. FT. EACH
FOR TOTAL ABSORPTIVE AREA OF 36 X 15.50 = 558 SQ. FT.
ABSORPTION FIELD SIZED AT THREE (3) TRENCHES 3 FT. x 75 FT. = 675 SQ. FT.
ALTERNATIVELY, USE 57 QUICK4 INFILTRATORS @ 9.87 SQ. FT. EACH
FOR TOTAL ABSORPTIVE AREA OF 57 X 9.87 = 562.59 SQ. FT.
ABSORPTION FIELD SIZED AT THREE (3) TRENCHES 3 FT. x 76 FT. = 684 SQ. FT.
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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 Rezulations 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 Septic Tank Absorption Field Building Sewer
water line 10' 25' 10'
domestic well 50' 100' 50'
domestic cistern 25' 25'
occupied bldng 5' 20'
property lines 10' 10'
subsoil drains 10' 25'
drainage channel 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 and have
glued joints. INFILTRATORS shall be placed level in the absorption field. All lines
discharging sewage from the residence 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 dwelling 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 or
flow fill when covered with less than 12" of soil.
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• 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. Provide 48 hour notice for all required inspections.
• Four inch clean outs shall be provided at maximum 100' intervals in all effluent lines
exceeding 100' in length.
• Prevent vehicle traffic and parking over the absorption field and repair area.
• A non -corrodible Orenco filter (model # FTW0444-36A) 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 effluent distribution system shall be constructed in accordance with the "Infiltrator
Technical Manual" available from Infiltrator Systems Inc., 123 Elm Street, Suite 12, Old
Saybrook, Connecticut 06475.
• The surface cap shall consist of native soil mounded 5% over the absorption field 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.
i. 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 trench by hand if necessary.
iv. Care should be taken in placing fill materials in the excavation to avoid
damaging the exposed soil surfaces.
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4.2 Operation - Maintenance and Inspections
• 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.
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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: 1) the proposed site
development and plot plan as fumished to Cronk Construction Incorporated by the client, and 2) the site
conditions disclosed at the specific time of the site investigation of reference. 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.
gri
Thomas A. Cronk, P.E.
TLC -044-1
Date 4 "c9\ 31 2t(
NOTE: This individual sewage disposal plan is meant to Include the following four pages of
graphics including: 1) plot plan, 2) septic layout plan, 3) absorption field plan view, and 4)
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.
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40' ACCESS EASEMENT
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absorption field consisting of
3 rows oF 19 Ouick4 Infiltrators
For a total of 57 units (Alternot,vely.
use 3 rows of' 12 H-10 Infi(trotors
For o tots( oF 36 units)
76..t yp -Quick 4
(75',typ.-H-101
typ (Ouick4)
75'.typ (14-10)
6' min
/(10' recommended/
a
m
provide Inspection/venting ports
at each end of Infiltrator
trenches as shown
ABSORPTION FIELD — PLAN VIEW
SCALE' 1'=20'
SILLS PROJECT - SCHLUMBERGER JOB
APPROX. 2005 CR 319, RIFLE
ABSORPTION FIELD - PLAN VIEW
MARCH 31, 2006
SCALE: ]'=20'
•
7
1
PROVIDE VENTING/INSPECTION
PORTS AS REQUIRED BY
INFILTRATOR INSTALLATION
GUIDELINES, TYP, EACH
ROW <ONE OF THREE)
SOIL CAP <MOUND 51/.)
3/1 MAXIMUM
SLOPE, TYP.
DISK OR SCARIFY UNDER
INFILTRATOR, TYP
EXISTING GROUND SURFACE
36' APPROX
(10'MIN
'NFL TRATOR, INSTALL IN ACCORDANCE
WITH 'INFILTRATOR TECHNICAL MANUAL,
INFILTRATOR SYSTEMS INC. 123 ELM
STREET. SUITE 12, OLD SAYBROOK,
CONNECTICUT 06475
OUTLETS AS REQUIRED
4' 45' -BEND SURGE
FLOW SUPPRESSOR,
INLET
1-.— 72' MIN, TYP
(120' PREFRRED)
36' H
ABSORPTION FIELD - CROSS SECTION
SCALE I'=5'
i m,_n-L-n-1 i_ EI tI_Iiuiul�l
((CO-1I I I =I -.I I- IJ Id L -III -IJ -I _ -III-III-_IJ.
--ui_,T_ .�� m=u T1=ITI=111-I_
MPACTED NATIVE SOIL OR S RUC TURAL 'U
FILL TO PREVENT SETTLING ;1=1L`—IIID Ii=111-
-
-T1='III.I'1=b1=1=,I L=1I E'11=iIIJlloll -11- _
DISTRIBUTION BOX DETAIL
SCALE'
18'
66'
-120'
SOILS LOG
(SEE NOTES)
SOILS LOG NOTES
p] - LIGHT TAN TO TAN SILTY SAND. BLOCKY. FRIABLE
112 - LIGHT BROWN CLAYEY SAND, FRIABLE, MEDIUM STIFF
113 - PITRUN (25nn-100nn), IN LIGHT TAN SILTY SAND MATRIX
NO GROUNDWATER OR HIGH SEASONAL WATER
TABLE TO 120' BGS
SILLS PROJECT - SCHLUNBERGER JOB
APPROX 2005 CR 3N, RIFLE
ABSORPTION FIELD - CROSS SECTION
MARCH 31, 2006
SCALE AS SHOVN
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APPENDIX A
SOILS AND PERCOLATION REPORT
CRONK CONSTRUCTION INCORPORATED
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CRONK
CONSTRUCTION
INCORPORATED
1129 -24- Road
• Grand Junction, CO 81505
970-245-0577, 970-257-7453 (fax)
SOILS AND PERCOLATION REPORT
Date: February 1, 2006
Prepared by:
Client:
Thomas A. Cronk, P.E.
1129 -24- Road
Grand Junction, CO 81505
245-0577
Jimmy Sills
Marnm Creek Commons, LLC
45705 Highway 6&24
Glenwood Springs, CO 81601
(970) 947-8571
Property address: Approximately 2005 County Road 319, Rifle, CO 81650
Tax schedule No.:
Legal Descript.:
1.0 Soils Evaluation
The site consists of approximately 7.91 acres of uncultivated native soil. Drainage is approximately 2%
to the east. A percolation test/soils evaluation was conducted on the property of reference on 02/01/06
by Tom A. Cronk,registered professional engineer (R.P.E.).
A perc excavation trench (excavation C) was extended to a depth of 120" below ground surface (BGS).
There was no evidence of ground water or high seasonal water table in the open excavation to a depth of
120" BGS. The soils evaluation indicates three distinct soil horizons underlie the site. A lithological
description follows:
depth (in.) description
0" - 18" silty sand, light tan to tan; blocky; friable
18" - 66" clayey sand, Tight brown; friable; medium stiff
66" - 120" pit run (25mm-100mm) in light tan silty sand matrix
Perc holes were constructed in excavation A at a depth of approximately 54 in., in excavation B at a
depth of 48 in., and in excavation C at a depth of 96 in. The holes appeared to be well saturated at the
time of the test. Results of the percolation test are shown in Table 1.
Page 1 of 3
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TABLE 1
Percolation Tal Results
Approx. 2005 CR 319
Depth
Time on 02/01/06
Time
Drop
Pere
Rale
min/in
11:10
11:25
12:00
12:10
(A) 54" - 72"
4.375
4.875
6.125
6.5
60/2.125
28
(B) 48' - 66"
1.75
2.25
3.125
3.25
60/1.5
40
(C)%" - 120"
3.1875
3.625
5.0
5.5
60/2.3125
26
2.0 Conclusions and Recommendations
Soils at the site appear acceptable for implementation of an individual sewage disposal system (ISDS).
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 72" BGS to
maintain 4' of usable infiltration soil above the extent of the subsoils investigation
excavation located at 120" BGS. A design perc rate of 40 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
3.0 Limitations
This report provides a professional assessment of the feasibility of implementing an individual sewage
disposal system on the property of reference. 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 extemal
events.
Croak 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.Thof /J
SEAL (may
nas A. Cron ISE
r4Af 31, )- D
Page A-3 of A-3
Date