HomeMy WebLinkAboutSP-3637GARFIELD COUNTY BUILDING AND, SANITATION DEPARTMENT P4rmlt N2 3637
109 8th Street /Suite 303 Assessor's Parcel No.
Glenwood Springs, Colorado 81601
Phone (303) 945.8212
INDIVIDUAL SEWAGE DISPOSAL PERMIT
PROPERTY (j/p l�/"
Owner's Name Gtt r4-1 Qt+{(Q-6ikP sent Address 1tat) C�(� `^`^arl6Pne963-wgs?
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This does no/constitute
a building or use permit.
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 uG 114-ga(7a
FINAL SYSTEM INSPECTION AND APPROVAL (as Installed)
Call for Inspection (24 hours notice) Before Covering Installation
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System Installer
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Septic Tank Capacity
Septic Tank Manufacturer or Trade Name kky
Septic Tank Access within 8" of surface
Absorption Area 1»
Absorption Area Type and/or Manufacturer or Trade Name
Adequate compliance with County and State regulations/requirements
Other
Date Inspector U&S a��dtiit/
RETAIN WITH RECEIPT RECORDS AT CONSTRUCTION SITE
1
*CONDITIONS:
1. All installation must comply with all requirements of the Colorado State Board of Health Individual Sewage Disposal Systems Chapter
25, Article 10 C.R.S. 1973, Revised 1984.
2. This permit is valid only for connection to structures which have fully complied with County zoning and building requirements. Con-
nection to or use with any dwelling or structures not approved by the Building and Zoning office shall automatically be a violation or a
requirement of the permit and cause for both legal action and revocation of the permit.
3. Any person who constructs,alters, or Installs an Individual sewage disposal system In a manner which involves a knowing and material
variation from the terms or specifications contained In the application of permit commits a Class I, Petty Offense ($500.00 fine — 6
months In )all or both).
White - APPLICANT Yellow - DEPARTMENT
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INDIVIDUAL SEWAGEDISPOSAL SYSTEM APPLICATION
)WNER T Cie;/4en 6,I1e
IDDRESS Ll y 83 C0 . 4-, Rd. /OO�Cat haltoaPHONE
sit,:ONTRACTOR B d- A 6 eneea 1 Cavi --ac ors
WDRESS 5)17 CR 1 sy 5ra;4e_.20e, 6 4.444 Spn4) Ce, PHONE
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PERMIT REQUEST FOR co 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 C.arbonda/e CC) Size of Lot 3S, 23L' -n3
Legal Description or Address See A-44ackeri, 4 M o CYC I CYO C'd
WASTES TYPE: y() DWELLING ( ) TRANSIENT USE
( ) COMMERCIAL OR INDUSTRIAL ( ) NON-DOMESTIC WASTES
( ) OTHER - DESCRIBE
BUILDING OR SERVICE TYPE: A" D U
Number of Bedrooms Number of Persons
( ) Garbage Grinder Q() Automatic Washer (K) Dishwasher
SOURCE AND TYPE OF WATER SUPPLY: (X) WELL ( ) SPRING ( ) STREAM OR CREEK
If supplied by Community Water, give name of supplier:
DISTANCE TO NEAREST COMMUNITY SEWER SYSTEM: /Mile 9
Was an effort made to connect to the Community System? N48
A site elan is reatdred tole submitted that indicates thefonowina MINIMUM distances:
Leach Field to Wen: 100 feet
Septic Tank to Well: 50 feet
Leach Field to Irrigation Ditches, Stream or Water Course: 50 feet
Septle System to Property Lines: (septic tank bleach field)10 feet
YOUR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT WILL NOT BE ISSUED WITHOUT
A SITE PLAN.
GROUND CONDITIONS*, I p
Depth to first Ground Water Table IUO4 e en C-okrl 4 44
Percent Ground Slope / 3 b4r
2
• • . .. .. ann 1 nwns 0..marLM w`M[u! `5 /173tR$39 (10
'YPE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED:
SEPTIC TANK '( ) AERATIONTLANT ( ) VAULT
VAULT PRIVY ( ) COMPOSTING TOILET ( ) RECYCLING, POTABLE USE
PIT PRIVY ( ) INCINERATION TOILET ( ) RECYCLING, OTHER USE
CHEMICAL TOILET ( ) OTHER - DESCRIBE
X)
TO:9P9450142
P:6,12
FINAL DISPOSAL B Y:
y) 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? N 0
PERCOLATION TEST RESULTS: (To be completed by Registered Professional Engineer, if the Engineer does the
Percolation Test)
Minutes / S per inch in hole No. 1 Minutes 0 per inch in hole NO. 3
Minutes / ti per inch in hole No. 2 Minutes per inch in hole NO.
Name, address and telephone of RPE who made soil absorption tests: lord? AL" "so", HP 6 .ehec hi
5-0)-0 CR Isg1UlenwchcJ Spr;/fs CO, 51461 (970 915--795y
Name, address and telephone of RPE responsible for design of the system: Vane) N; J o 1 so ps; s E. As- in
CO Mar S#,Su:+tA• Carhesnok y CO 2103 (c17Cat) 7ay-6sil
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 tare 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 Anther 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.
SignedV�y(ti,//1 at)"Nale e" Date
PLEASE DRAW AN ACCURATE MAP TO YOUR PROPERTY!!
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PROPERTY DESCRIPTION
LOT 4
A PARCEL OF LAND SITUATED IN THE NW1/4 AND THE NE1/4 OF SECTION 30.
TOwNSHIP 7 SOUTH. RANGE 87 WEST OF THE S''<71-1 PRINCIPAL MERIDIAN.
GARFIELD COUNTY, COLORADO MORE PARTICULARLY DESCRIBED AS FOLLOWS:
COMMENCING AT THE NORTHWEST CORNER OF SECTION 30, A GARFIELD COUNTY
SURVEYOR BRASS CAP MONUMENT FOUND IN PLACE; THENCE N 68'32'26' E
1435.17 FEET ALONG NE NORTHERLY LINE OF SAID SECTION 30 TO A FENCE
AS CONSTRUCTED AND IN PLACE; THENCE S 00'22'2C E ALONG SAID
FENCE 1046.33 FEET. THE TRUE POINT OF BEGINNING; THENCE
S 0022'24' E 245.77 FEET; THENCE S 44'45'55' E 1018.89 FEET TO
A POINT ON THE WESTERLY RIGHT-OF-WAY OF COUNTY ROAD NO. 100: THENCE
ALONG THE WESTERLY RIGHT-OF-WAY UNE OF SAID COUNTY ROAD NO. 100
THE FOLLOWING COURSES AND DISTANCES:
THENCE S 37'14'00" W 267.87 FEET;
THENCE S 4714'50" W 218.27 FEET;
THENCE S 20'20'44" W 54.14 FEET;
THENCE 5 23'35'48' W 332.23 FEET;
THENCE 5 01'21'16' E 7.95 FEET; TO A POINT ON THE SOUTHERLY LINE
OF THE NWI/4 OF SAID SECTION 30; THENCE LEAVING SAID WESTERLY
RICHT-OF-WAY LINE N 89'50'51' W 577.08 FEET ALONG NE SOUTHERLY
LINE OF THE NW1 /4 OF' SAID SECTION 30; THENCE LEAVING SAID SOUTHERLY
LINE N 25'38'17' W 707.44 FEET; THENCE N 00'00'00' E 1038.20
FEET; THENCE N 88'32'26' E 638.25 FEET TO THE TRUE POINT OF
BEGINNING. SAID PARCEL CONTAINING 35.836 ACRES. MORE OR LESS.
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JAN -29-2002 1158
P.02
January 29, 2002
Rodney McGowen
B & 11 Contractors
Gilbert Residence
5317 County Road 154, Suite 206
Glenwood Springs, CO 81601
RE: Gilbert Residence — Proposed ISDS System, Lot 4, Los Pinones Ranch.
Garfield County, Colorado
SE Job No. 21181.01
Dear Rodney:
Pursuant to your request, attached herewith is a letter/report presenting our findings in regard to the
feasibility and design for an Individual Sewage Disposal System (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. Garfield County must permit any proposed
improvement to the site. We have reviewed the information forwarded to us, formulated an ISDS design
and created a site plan with construction details as part of our scope of work.
Conclusions
Based on our findings we believe that the design and installation of an approved ISDS system, to serve a
proposed accessory dwelling unit on the property, is feasible in accordance with the Regulations of
Garfield County and the State of Colorado. We recommend that a new 1000 gallon septic tank be
installed that will discharge effluent to a 300 square foot soil absorption bed system. The soil absorption
system can be installed in natural soils and will be located within the septic envelope down gradient of the
proposed Barn/ADU, as delineated on the attached plan. The system will meet all required setbacks and be
installed within the general boundaries indicated on the plan. Our design is outlined below and delineated
on the attached site plan.
Site Location
The subject site is located at 4480 County Road 100, Carbondale, CO, on Lot 4, Los Pinones Ranch
Subdivision, in Garfield County, Colorado. The Site comprises approximately 35.8 acres. Other similar
lots bound the site.
Ezistine Site Conditions
The ground surface in the building area is relatively flat with a gentle slope down to the west. The
existing ground surface in the proposed septic area is on ground with an approximate slope of 15%. The
lot is vegetated with sagebrush, grasses and weeds. Pinon trees are located in the area surrounding the
building site clearing.
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311' Fax (970) 704-0313
SOPRIS ENGINEERING • LLC
civil consultants
JAN -29-2002 11:59
P.03
Rodney McGowen
SE Job No. 21181.01
January 29, 2002
Page 2
Proposed Development Improvements
It is our understanding that you intend to construct a barn facility incorporating a 2 bedroom, residential
caretaker unit. The proposed structure will have 1-1/2 bathrooms and a kitchenette. Potable water will be
supplied from an existing well on site that currently serves an existing single family home. The well
permit allows ordinary household use inside 3 single-family dwellings. The proposed improvements will
include a new ISDS system, designed to handle the flow from an equivalent 2 -bedroom home. This
detailed ISDS design is presented pursuant to the conditions of approval granted in the Special Use Permit
by Garfield County.
Subsurface Conditions
A subsurface investigation and percolation test was conducted on January 16, 2002 by Hepworth-Pawlak
Geotechnical, Inc (HP). The results are attached in the HP report dated January 22, 2002, Job Number 199
516. The subsoil encountered at the site consists of 1.-1 1 foot of topsoil overlying weathered and
fractured siltstone/claystone to the maximum depth explored in the profile pit of 17 feet, Groundwater
was not encountered in the test profile pit.
Percolation testing utilized three test holes, which were placed at varying depths in the pit. The fastest
measured rate was 10 minutes per inch and the slowest measured rate was 20 minutes per inch. The
slower percolation rate of 20 minutes per inch will be used and is suitable for a conventional absorption
system.
preliminary System Design:
A site plan is provided to detail the various components of the proposed sewage disposal system. We have
designed a system to handle a maximum peak design flow based on a 2 -bedroom house. The system will
include a 1000 -gallon septic tank, distribution box and a soil absorption system consisting of graveness
leaching chambers installed in a 25' long by 12' wide absorption bed. The bottom of the bed will be over
excavated to provide soil replacement with the installation of a minimum 6 inches of filter sand. The
following information details the technical criteria utilized in design of a feasible 2 -bedroom system.
Deafen Criteria
The proposed residence is a 2 -bedroom accessory dwelling unit. The design flow is calculated as follows:
The new ISDS shall be based on a minimum of 2 -bedrooms for a structure 700 S.F. or larger.
Residence unit - 2 bedrooms @ 2 person /bedroom = 4 person
From the Pitkin County I. S. D. S. Regulation;
Max. Design flow (Qd) ■ # of people x 1.5(avg. flow) gal/person/day.
Gallons per day for the subject house = 75 gal/person/day
Od - 4'75"1.5.450 nal/day
JAN -29-2002 11:59
Septic Tank Design
Q = 4*75"1.5 =450
Volume (V) of tank = Design Flow * 1.25 (30 hour retention time)
V a 450 ga1/day * 1.25 = 563
Use one double compartment, concrete 1000 -gallon septic tank.
P.04
Rodney McGowen
SE Job No. 21181.01
January 29, 2002
Page 3
Percolation Test Results
The results of percolation tests indicated a slower percolation rate of 20 minutes per inch at a lower depth
of 12 feet. The upper zones have a faster percolation rate however the slower rate will be utilized for
design purposes for a conservative estimate of the long-term absorption capacity. The field is sized by
using the standard absorption area equation based on the design flow and this percolation rate. A shallow
soil absorption bed system, utilizing graveness leaching chambers is recommended. The State allows a
40% reduction in the size of a bed system utilizing gravelless leaching chambers.
Soil Absorption System Design
Based upon the percolation test rate, the standard absorption area equation is:
A (SF) = O'(tY4 : where A = Area; Q = flow (gal/day)
5 t = time in minutes
This design calculation results in a recommended minimum absorption area:
A = 45Q'(20)" = 405.5 sq. ft.
5
Apply a 40% reduction for utilizing graveness leaching chambers.
A = 402.5 sq. ft. (0.60) = 241.5 sq. ft.
Assume 153 square feet per chamber: 241.5 sq.ft. = 15.6 chambers Use 16 chambers
15.5 sq.ft/chamber
Use a 248 sf of absorption arca with 16 graveness leaching chambers:
We recommend using a bed system composed of 4 rows containing 4 standard infiltration chamber units in
each row. Equal distribution is recommended.
We recommend that the beds rows be connected with individual distribution lines coming from a
distribution box. The bed is to be constructed level and shall be constructed not to exceed a maximum
depth of 4 feet. An inspection port should be installed on the top mid -point cutout at each corner end
chamber in the bed. This will allow for location and checking the performance of the system over time.
JAN -242002 12:00
P.05
Rodney McGowen
SE Job No. 21181.01
January 29, 2002
Page 4
Effluent Dii tribution System
A gravity distribution system will be utilized to transport effluent from the septic tank to the absorption bed
chambers. An effluent filter will be installed in the secondary compartment of the septic tank to reduce
potential suspended solids and biological loading to the absorption field. A 4" discharge line will
discharge effluent to a distribution box installed up -gradient and adjacent to the trenches. The 4" PVC
effluent discharge line will be installed with a minimum 2% slope. The effluent will be equally distributed
from the distribution box through individual distribution pipes to the bed. The distribution box will
incorporate a riser to the surface to mark the access lid. We recommend that every two rows be
connected as pairs with a header pipe to 1 of 2 individual distribution lines coming from a distribution box.
The distribution pipes will connect to the head of each chamber row.
Construction and Inspections
Prior to construction of the permitted system the engineer should be contacted well in advance to provide
adequate time to discuss the system components with the contractor, answer questions, resolve any conflict
issues and schedule inspection site visits based on construction progress. County Regulations require that
the Design Engineers of record perforin site inspections of the permitted system during construction and
provide "As -Built" documentation of the installed system to the County after construction is complete. A
site inspection shall be performed of the exposed components of the system prior to backfilling. Therefore
the Engineer should be contacted and notified of the construction schedule.
JSDS Operation and Maintenance
A properly designed and utilized ISDS system should require minimal maintenance. Several factors
influencing the need for maintenance include: actual wastewater flows versus design flows, the volume of
kitchen/domestic waste (excluding human waste and toilet paper), excessive household chemicals or other
toxic liquids and the physical integrity of the system components. It is recommended that the septic tank,
absorption field and inspection ports should be inspected annually. The tank, effluent filter and other
applicable components should be visually inspected BI -annually for debris, wear, damage, leaks, or other
potential problems. In general, for a properly utilized system, septic tanks should be pumped and inspected
every 2 - 4 years. The effluent filter should be cleaned every six months and at the time of pumping.
Absorption fields should be maintained with suitable cover and kept free of root invasive plants. Positive
surface drainage away from the absorption field should be maintained. Attached is an ISDS operation and
maintenance guide.
General Notes
1) All materials and installation practices shall conform to the State of Colorado and Garfield County
Individual Sewage Disposal Regulation.
2) All sewer lines and distribution lines in the system shall be 4" Schedule 40 or SDR -35 PVC unless
specified otherwise on the plans.
3) Add a two-way clean out on the service line from the proposed residence.
4) The system shall be plumbed to provide equal effluent distribution into the trenches.
JAN -29-2002 12:00
•
P. 06
Rodney McGowen
SE Job No. 21181.01
January 29, 2002
Page 5
5) The contractor shall ensure that the concrete septic tank and sewer lines are watertight.
6) The absorption field area must be protected to prevent damage from vehicular or livestock traffic and
must be crowned to divert drainage runoff away from the trenches to minimize surface infiltration.
7) The contractor shall not excavate to a depth greater than three feel (4') at any one location within the
site of the proposed absorption system.
8) The leaching chambers shall be installed level in each bed. A splash plate shall be installed on the bed
bottom surface below the inlet in each row to prevent scouring from the effluent.
9) The top of the backfill over the chambers shall be covered with filter fabric or other suitable pervious
material to prevent the migration of fines from the overlying topsoil layer.
10) The bed must have a minimum cover of 10 inches. A final cover of topsoil, suitable for vegetation, a
minimum 4" deep, shall be placed from the top of the pervious cover layer to the finished surface
wade.
11) The absorption trenches must be sodded or covered with vegetative ground cover.
Our design and recommendations are based upon data supplied to us by others. If subsurface or site
conditions are found to be different from those presented in this report, we should be notified to evaluate
the effect it may have on the proposed 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
Yancy Nichol, P.E.
Project Engineer