HomeMy WebLinkAboutpitkin.eh.273510202008 (2000)Pitkin County Environmental Health Department
Permit for an Individual Sewage Disposal System
130 S. Galena St. Aspen, Colorado 81611
Phone 970-920-5070 / FAX 970-920-5074
Permit # 00039 Parcel ID #
2735-102-02-008
Type of permit New( X ) Repair( ) Addition to House( )
Name of Owner William Smithburg
Street Address 369 Eagle Park Dr
Property legal description Lot 8
Size of lot
10.79
le Pines
Total square footage of the house
8.525
Water source City of Aspen/well for irrigating
# of bedrooms in house 5 # of offices, lofts & similar sized rooms in house
Caretaker unit detached
# of bedrooms in caretaker unit
Designed for what # rooms (list)
Designed by
Total square footage of the caretaker unit
# of offices, lofts & similar sized rooms in caretaker unit
SEVEN (7): 5 BR's main residence, 2 for detached caretaker
('hi irrh R AQcZ0rJAtP.S_ Inc
Permit information
Mailing Address 4501 Wadsworth Boulevard, Wheat Ridge, CO 80033
Perc rate 40
Septic tank capacity
Profile hole depth 8 ft
:3500 total
Depth to groundwater or bedrock
+8 ft
Absorption area 3,542, 30% Infiltrator reduc. = 2,479 sq ft
rnmmpntS
Septic permit approved per compliance with the engineer design and specifications dated May 24, 2000. Any
changes must be approved by this department and the design engineer prior to them being made.
Design is for one 1000 gallon two-compartment concrete tank at the caretaker unit. There is a 2000 gallon followed
by a 1500 gallon with a pump in a biotube vault. All three tanks are two-compartment concrete. The field is 5 beds
with 2 rows of 16 chambers with a 4 inch perforated pipe the full length on the ground surface. (160 chamber total).
Minimum horizontal distances between components of the system and physical features shall conform to the Pitkin
County ISDS regulations.
This department does riot endorse any brand of products.
The engineer must do a final inspection of the installation and submit an as -built letter to this department. This
department must also be called for an inspection with a minimum of 48 hours advanced notice.
Permit approved by: _ �1, Date: " 0
Plans and specifications of the proposed individual sewage disposal system have been reviewed and are considered
satisfactory. Permission is hereby granted to the owner or the agent to perform the work indicated in accordance with the Pitkin
County ISDS Regulation in effect at the time of issue. This permit becomes invalid 6 months from the date that the permit was
issued unless system construction has commenced or an extension has been approved in writing by the Department.
As -built drawings must be included with this permit before the final approval will be issued.i1�'
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AFa- 1-0'C• TUE 11:57 AM ASPEN/PITKIN ENV HEALTH FAX -.970 920 5074 PAGE 3
ASPENA , KIN ENVIRONMENTAL HEALTH DEPA. iAENT
APPLICATION FOR INDIVIDUAL SEWAGE DISPOSAL SYSTEM
130 S. Galena St., Aspen Colorado 81611
Phone 970-920-5070/Fax 970-920-5074
Name of OWNER IAy., de Me's, 1
Owner's Mailing Address YN f
Business Phone ?Nn C> 9 P,'1 3 4 3 1 Home Phone:
Primary Contact Person (all communication regarding this permit will go through this personf
Nan*P
Comosrry C +
Contact Mailing Address 3 e a C 0 l
Business Phone :9 .-3 1 Cell Phone : %A Fax-:
Parcei ID # (available from assessor's office
at 420-5160 or at www.aspon.com/assessor/)�-
Street address of property 3 Cv ► c
Legal Description: Lot __J_ .Block Filing Subdivision q�l
Size of lot: I V:79 acres. Type of proposed structure: Fg m,L Size of oidg. envelope:
Total square feet of house 4 5 5
# of offices, lofts & similar sized rooms in house
# of bedrooms in house S
Caretaker Unit: Attached (X) Detached ( ) Total area(sq. ft.) of caretaker unit g 9 s
oi s k,.a.,,,. & ;n n.frernlror i snit r # of offices. lofts and similar size rooms of caretaker unit I
Permit is for New Home ( X ) Repair due to failure ( ) Remodel/Addition ( ) Emergency use ( }
Water. Private well ( ) Spring ( ) Stream ( ). Community/Public Water System (�()
If community system: Name of system
The fee for a ISDS application is $330 for a permit that takes 6 hours or less for the department to approve. If approval takes
longer than 6 hours, a rate of S55 per hour will be charged. The maximum fee is 51000. The basic fee of 5330 is due at the time
of application. The remainder, if any, will be due in two stages: first, at the time of issuance of the ISDS permit; second. before
final approval of the ISDS permit.
Application for an individual sewage disposal systr M is hereby submitted. I hereby certify that the above information is true and
accurate and that I have provided true and accur a information on locations of all existing and proposed wells. contour
intervals, buildings, property lines, ditches, slopes, waterlines, springs, suction or irrigation lines, drinking water cisterns, drain
dies, irrigation ditches, lakes, water courses, streams, floodplain, dry gulches. and existing septic systems. I hereby certify
that any such features. not shown on attached site map are not present- Issuance of the permit does not imply the approval of
any other permit required for construction pursuant to Pitkin County codes. No construction may be undertaken until all
approvals and permits have been obtained.
The Aspen/Pitkin Environmental Health Department. Pitkin County and employees of these agencies will be held harmless
should the individual sewage disposal system fail or malfunction. The permit to construct is issued on information submitted by
the applicant or his/her representatives. The owner assumes full responsibility in case of failure of the system.
Signature of applicant Date
Received by G Receipt # Date 513
G:\eh\isds\isdsapp.doc
,. I
ENGINEERS & GEOLOGISTS
September 12, 2002
Todd Haberman Construction
Attn: Tom
P.O. Box 1210
Basalt, Colorado 81621
Subject: Installation Observation, Proposed Smithburg Residence
Lot 8, Eagle Pines Subdivision
Pitkin County, Colorado
Job No. 11838
Gentlemen:
As requested, we observed the installation of the onsite wastewater system (OWS) for the subject site on
October 23, 2001. The system was designed under our Job No. 11838, dated May 24, 2000.
The system includes the installation of one 2000 -gallon, single -compartment, precast concrete septic tank,
followed by one 1500 -gallon, two-compartment, precast concrete septic tank with a pump in a BiotubeTM
pump vault for the main residence, and one 1000 -gallon two-compartment precast concrete tank with an
effluent filter for the caretaker unit. Five gravelless chamber -beds were installed, each bed has 2 rows of
16 chambers for a total infiltrative area of 2480 square feet. A flow splitter basin was used to distribute
effluent to the trenches.
The pump, alarm, and Biotub6m vault were in place at the time of our site visit. The construction
foreman, Tom with Haberman Construction, may activate pumping system at his discretion. The
components of the OWS were installed in conformance with our plans and specifications.
If there are questions or if we may be of further service, please call.
CHURCH and Associates a 01��
�JJ`� 6D•0• C,f;���`
G;
Edward O. C arch, P.E. ' 72
EOC/trp/erb v
2 copies sent RECEIVE
Copy to PCEHD, Attn: Nancy MacKenzie, via Priority Mail
SSP 1 6 2002
PIT0 0 COUNTY
c�sfi�� rK 3os'�ab.a3
DENVER 4501 Wadsworth Boulevard Wheat Ridge, CO 80033 LTHEVERGREEN 303.816.1455
303.463.9317 Fax: 303.463.9321 LOVELAND 970.663.2124
WESTERN SLOPE 970.948.5803
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YPICAL PLAN VIEW - N.T.S.
0
'
Eo
4" SDR 35 PVC"
OBSERVATION/VENT PIPE
TYPICAL CROSS-SECTION -N.T.S. 4" SDR 35 PVC
_-------OBSERVATION /VENT PIPE
WITH CAP
GRAVELLESS CHAMBR
3' BY 6.25'
r4" SDR 35 PERFORATED
PVC PIPE PLACED ON G ACCORDING TO
MANUFACTURERO
SPECIFICATIONS
(PIPE INSTALLED LEVEL)
FI LL
3' t AX / ! I J 1.5' IMIN.
EXTENT OF EXCAVATI
CALCULATIONS AND SPECIFICATIONS
DESIGN CRITERIA
MAIN RESIDENCE = 5 BEDROOMS, >6000 SF
LOADING = 130 GAL/DAY/PERSON
AVERAGE LOADING = 1300 GPD
PERCOLATION RATE = 4.0 MPI
AREA = (1.75 X Q X4-1)/5
AREA = 2878 SF
REDUCTION FORUSE OF CHAMBERS - 30%
TOTAL AREA = 2014 SF
. 118
' MIN.
TOTAL - FIVE BEDS
4" SDR 35 PERFORATED
PVC PIPE PLACED ON GROUND
SURFACE ACCORDING TO
MANUFACTURER SPECIFICATIONS
SCOPE FOR
DRAINAGE
CARETAKER UNIT = 2 BEDROOMS, <2000 SF
LOADING = 75 GAL/OAY/PERSON
AVERAGE LOADING = 300 GPD
PERCOLATION TEST = 40 MPI
AREA - (1.75 X Q X7 -f T)/5
AREA = 664 SF
REDUCTION FOR USE OF CHAMBERS - 30%
TOTAL AREA = 465 SF
GRAVELLESS CHAMBER
3' BY 6.25'
EFFLUENT Iti_E'
(1/8" PER FOOT DROP)
6' MIN
FLOW SpLrrrER BASPi
FOR
GRAVITY FLOW
EFFLUENT
INLET
LEVEL MANIFOLD
TO FIELD s1
FILCW SPLITTER BASIN
(F S 24/30 - 5 OUTLETS)
4" SDR 35
¢ SOLID PVC PIPE
(SCHEDULE 40
UNDER DRIVE; 1/8"
PER FOOT DROP)
EFFLUENT LINES TO ADDITIONAL BEDS
TO FIELD #2
TOP VIEW
TO FIELD is
TO FIELD f5
FINAL GRAD
1 8"
1
'r
4�
3I
a• PVC INFLUENT FROM i 4
DOSING TANK u
i
SIDE VIEW \INS
TOTAL AREA NEEDED = 2479 SF
TOTAL AREA PROPOSED = 2480 SF
BED SPECIFICATIONS
NUMBER OF BEDS = 5
LENGTH OF EACH BED = 100 FEET, 16 CHAMBERS
WIDTH OF EACH BED = 6 FEET, 2 CHAMBERS
TOTAL NUMBER OF CHAMBERS = 160 CHAMBERS
TOTAL AREA = 2480 SF
DRAIN FIELD DETAILS
TO FIELD #3
FIBERGLASS LID WLTH STAINLESS El EEL
'–BOLTS & URETHANE GASKET.
—RIBBED PVC BASIN
PVC DfSCHARGE PIPE
EFFLUENT DISCHARGE. Ot
-GROMMET
'ALL SPEED LEVELER"
'NT UNIT SPECIFICATIONS
TOTAL CAPfiLCITY - 1.75 X Q X (30 HOURS/24
HOURS) = 2884/657 GALLONS = 3541 GALLONS
RECOMMENDATION - ONE 1000 -GALLON
TWO-COMPARTMENT AND ONE 2000 -GALLON SINGLE
COMPARTMENT PRECAST CONCRETE SEPTIC TANK
FOLLOWED BY ONE 1500 -GALLON
TWO-COMPARTMENT PRECAST CONCRETE SEPTIC
TANK WITH A PUMP IN A BIOTUBE VAULT IN THE
FIGURE
Augus
Pat Pa
Todd 1
Box I Z I V /--IV rarx tivciiuc
Basalt, CO 81621
RE: Parcel #2735-102-02-008
Smithburg Residence
Dear Mr. Patterson:
This letter is to advise you that we have not been able to final the Individual Sewage Disposal System
(ISDS) permit for the above stated residence/property.
It is mandatory that this office receives an "As Built" letter from the engineer who designed the system
showing the tank for the caretaker unit. The letter will confirm that they observed the installation of
the system as designed. The change of the caretaker unit tank must be noted in the letter or by a new
set of plans. We cannot sign the Certificate of Occupancy for this property without the revised "As
Built" letter.
This office must receive the revised "As Built" letter from the engineer no later than September 12,
2002.
Please contact me with any questions. Thank you, in advance, for your help and co-operation in this
matter.
Sincerely,
Beth Seeman
Pitkin County Environmental Health
cc: Church and Associates
pitkin
County Ellvifoomentdl lfedlth
October 9, 2001
To: Mr. Pat Patterson
Todd Habermann Construction
BOX 1210
Basalt, CO 81621
RE: Smithburg Residence, 369 Eagle Park Drive, Eagle Pines
CC: Tim Petz, Church and Associates
Dear Mr. Harris,
This letter is to advise.you that we have not been able to final the Individual Sewage Disposal System
(ISDS) permit for the above stated residence/property.
It is mandatory that this office receives an "As Built" letter from the engineer who designed the
system. The letter will confirm that they observed the installation of the system as designed. Any
changes to the system must be noted in the letter or by a new set of plans. We cannot sign the
Certificate of Occupancy for this property without the "As Built" letter.
This office must receive the "As Built" letter from the engineer no later than November 12, 2001.
Please contact me with any questions. Thank you, in advance, for. your help and co-operation in this
matter.
Sincerely,
�3
Madelyn B. Sigley
Pitkin County Environmental Health
0405 Castle Creek Road, Suite 10 Aspen, Colorado 81611
(970) 920-5070 fax 920-5077 www.pitkingov.com
0
Jun 27 00 01:55a r-:1.1JRCH & Rssocaties 3"q-463-9321 p.1
CHURCH & Associates, Inc.
ENGINEERS & GEOLOGISTS
May 24, 2000
Todd Haberman Construction
Attn: Pat
P.O. Box 1210
Basalt, Colorado 81621
Subject: Subsurface Investigation and Revised OWS Design, Proposed Smithburg Residence
Lot 8, Eagle Pines Subdivision
Pitkin County, Colorado
Job No. 11838
Dear Mr. Haberman,
As requested, we have evaluated subsurface conditions for the site and designed a revised onsite
wastewater system (OWS) for the proposed main residence and caretaker/employee unit_ Our firm
investigated subsurface conditions on October 12, 1999 and May 18, 2000. This letter should be used in
conjunction with our original design. This letter includes two revised figures, Figures 1 and 2, and a
continuation of Table 1. The original Figures 1 and 2 should be removed to avoid confusion.
SITE CONDITIONS - The lot is located in a rural residential area in Pitkin County, Colorado. The pro-
posed drain field arca has a moderate slope of 12-15% to the northwest. There is a thick cover of native
grasses, scrub oak, and aspen trees in the proposed field area. There is an existing well southwest of the
proposed residence, as indicated on Figure 1.
PROPOSED CONS'T'RUCTION - A five ,bedroom residence and a two-bedroom caretaker unit/guest
house are proposed at the locations presented on Figure 1. We are sizing the OWS based on 7 bedrooms
and 1600 Gallons Per Day (GPD) using Aspen/Pitkin Environmental Health Department (APEHD)
loading of 130 and 75 gallons per day per person, as appropriate. The loading was determined based on
individual detached structures. The main house, which has greater than 6000 square feet (SF), is
proposed to have 5 bedrooms and therefore an average loading of 130 GPD/person was used to determine
the average loading of 1300 GPD. The guesthouse has less than 2000 SF, and is proposed to have 2
bedrooms, so the average loading was based on 75 GPD/person for an average loading of 300 GPD. The
design sewage loading with a peaking factor of 1.75 for the combined OWS is 2800 GPD. This loading
includes washing machines and garbage grinders. The APE14D regulation setback to a well for the
proposed loading is 244 feet. An onsite well located 244+ feet southwest of the proposed drain field will
serve the residence.
SUBSURFACE CONDITIONS — A subsurface investigation was performed by digging 6 percolation
holes, 19 to 37 inches deep, and two profile pits at the location indicated on Figure 1. Subsurface
conditions in Profile -1 consisted of 1 -foot sandy root zone, underlain by sandy clay with gravel to the
DENVER 4501 Wadsworth Boulevard Wheat Ridge, CO 80033
303.463.9317 Fax: 303.463.9321
Revised OWS Design
Job No. 11838
Page 2
explored of 8 feet. Subsurface conditions in Profile -2 consisted of a 1 -foot root zone, underlain by sandy
clay with very sandy lenses to the maximum depth explored of 8 feet. No ground water or bedrock was
observed in the profile pits. Percolation tests indicate percolation rates of 15 to 60 minutes per inch (MPI).
We are providing an OWS design in the area of Profile -2, based on the average percolation rate of 40 MPI.
RECOMMENDATIONS — The OWS is proposed to include the installation of two septic tanks, a lift
station with a pump in a biotube vault, and five chamber -beds at the locations presented on Figure 1. The
OWS design is based on an average sewage load of 1600 GPD and a percolation rate of 40 MPI. We a
recommend the installation of one 1000 -gallon two-compartment concrete se*1.The
k at the caretaker d
and one 2000 -gallon septic tank at the residence to be followed by one 1eon two-compartment
septic tank/lifitation with a pump in a biotube vault, as indicated on Figure pump shoulddose the J
beds with a minimum of 400 gallons. A pump is required due to elevation differences and to distribute the -�
effluent through the field to increase the efficiency. The pump must be capable of discharging 30.0 gallons �
per minute with a total dynamic head of 30.5. Pump details are presented in Figure 4. A flow splitter basin l
(FS 24/30 — 5 outlets) should be installed to distribute effluent among the beds. Five chamber -beds, each
with 2 rows of 16 chambers with a 4 -inch perforated SDR 35 PVC pipe to be placed full length on the
ground surface should be installed.
Our firm investigated additional OWS design alternatives such as recirculating sand filter systems in order to
minimize impact on existing vegetation. APEHD allows a maximum drain field size reduction of 30%.
Proposing an advanced treatment design would not be cost effective and would not provide additional field
size reduction.
Vehicle movement over the drain field area during construction should be kept at a minimum to
prevent compaction of the receiving soils. The bottom of the bed be scarified with a pick, shovel, or
backhoe bucket teeth prior to the addition of infiltrators.
The surface of the field should be seeded after installation of the fields. We recommend using a native seed
mix available at seed stores. These mixes do not require irrigation and develop a growth 10 to 15 inches
high. No automatic sprinkler system should be installed over the fields.
OPERATION AND MAINTENANCE
The owner must realize an OWS is different from public sewer service. The owner must be aware of,
and assume responsibility for, continued maintenance of the system. In the absence of a monitoring
program, the septic tank should be pumped every two years. Effluent filters and screened vaults, as
applicable, are to be cleaned during pumping. There are daily considerations such as not putting plastic
or other nonbiodegradable materials into the septic system. Garbage disposal use should be minimized.
The backwash of a water softener may be harmful to the OWS. A separate drywell should be constructed
for the backwash waste, if a softener is installed. Chemically treated water from a swimming pool or spas
should not be introduced to the OWS.
LIMITATIONS
A contractor, who is experienced in its installation, should install the OWS design. Our investigation, layout,
design and recommendations are based on data submitted. If subsurface conditions considerably different
from those described in this report are encountered, we should be notified to evaluate the effect on the
Revised OWS Design
Job No. 11838
Page 3
proposed OWS. If the health department makes modifications to this design, we should be contacted to
evaluate the impact on the performance of the OWS. The county and our firm must be contacted upon
completion of the OWS
All construction is to be in accordance with the ISDS regulations. Pipe type and size, burial requirements,
septic tank construction, and other specifications, which are not depicted in our report, are to conform to
the requirements of the ISDS regulations. The installer of the system is to have demonstrated knowledge of
the APEHD ISDS regulations and requirements.
If there are any questions or if we can be of further service, please call. The project engineer for this site is
Tim Petz.
Sincerely,
CHURCH &
tl-'�
Edward O. Cl
EOC/trp
3 copies sent
Profile -2
TAOLE 1 - (cont) PERCOLATION TES I RESULTS
Lot 8, Eagle Pines Subdivision DATE OF TEST: 5-18-00
Pitkin County, Colorado
MVV•
0-1' Topsoil, rootzone, dark brown
1-8' Clay, sandy, with very sandy lenses, medium to medium stiff, iTioist,
brown/dark brown
NO GROUND WATER WAS ENCOUNTERED WITHIN THE EXCAVATION
AVG.
HOLE DEPTH TIME DEPTH DEPTH CHANGEINTERVAL HOLE
,
NUMBER OF HOLE, INTERVAL START, ENDpERC PERC.
,
(INCHES) (MINUTES) (INCHES) (INCHES) (INCHES)
RATE (MPI) RATE,
IMPI1
4
:31
20
17.00
22.00
5.00
4
20 16.00 16.50
0.50
20
22.00
24.75
2.75
7
20 17.00 17.50
0.50
20
24.75
27.00
2.25
9
60
20
15.50
17.00
1.50
13
20
17.00
18.00
1.00
20
20
20
18.00
19.25
1.25
16
40
5_>8
1.25
20
15.00
17.25
2.25
9
20 16.00 16.50
0.50
20
17.25
18.75
1.50
13
20 17.00 17.50
0.50
20
18.75
19.75
1.00
20
60
20
19.75
20.50
0.75
27
2020.50
21.00
0.50
40
20
2.1.00
21.50
0.50
40
40
g 37 20 13.75 15.00
1.25
16
20 15.00 16.00
1.00
20
20 16.00 16.50
0.50
40
20 16.50 17.00
0.50
40
20 17.00 17.50
0.50
60
20 17.50 18.00
0.50
1 60
60
NUMBER OF HOLES: 3
AVG PERCOLATION RATE (MPI): 40
Job No. 11838
ASPEN/A. #IN ENVIRONMENTAL HEALTH DEPART
ISDS DESIGN REQUIREMENTS -DEPARTMENT USI
Name Smithburg, Lot 8 Eagle Pines
House Size (75 gpd, 100 gpd, or 130 gpd)
#of Bedrooms, Similar Rooms accessible to baths in Main Residence
# of Bedrooms, similar rooms w/ access to bath in ATTACHED caretaker
# of Bedrooms & Similar Rooms w/ access to baths in DETTACHED caretaker
Average Daily Waste Flow 1050 # bedrooms X 2 people/br X 75
State Review Required? no
Perc Rate 40 (T) 3 equals # of Perc Holes Required
Design Flo w (Q) = # bedrooms X 2 people/bedroom X gpd X 1.75
Q= 2800 ,0
7 91y
Minimum tank capacity 3500 gallons
Absorption Area (A= Q/5 X SQRT)
A = 3542 sq. ft. of absorption area required
229 infiltrator units without reduction
A maximum 30% reduction is allowed for use of deep gravel or gravelless chambered system.
2479 sq.ft. with reduction ✓/
160 infiltrator units with reduction
AREA NEEDED FOR STANDARD ABSORPTION TRENCHES
1181 3542 Total sq ft /3 =lineal ft of trench needed
130
5
2
20 1181 lineal ft/assumed trench length of 60ft = # of 60ft trenches needed
19 # trenches minus 1 = rows of 6ft wide undisturbed soil between trenches
M 20 times 3 = total width of of 60" long field needed for just the trenches
14 19 times 6' = total width of 60' long field needed just for undisturbed soil
174 width of trench +width of undisturbed soil = total width needed
174 by 60 ft is the area needed for a standard absorption field in a trench configuration with no
reductions taken and ASSUMING AN AVERAGE PERCOLATION RATE OF 40
SLOWER PERCOLATING SOILS WOULD REQUIRE MORE AREA.
SETBACK FRO�fAPRY
SETBACK FROM POND, STREAM OR IRRIGATION DITCH
# of feet = # of feet = 194
SETBACK FRO ULCH
# of feet = 169
Remember: 8 feet of additional distance for each 100 gallons/day of design flow over 1,000 gallons/day
should be added unless an RPE can verify that it is not necessary to prevent contamination.
1/20/99
Printed on Recycled Paper
LzJ
CHURCH
March 17, 2000
Todd Haberman Construction
P.O. Box 1210
Basalt, Colorado 81621
M
Associates, Inc.
ENGINEERS & GEOLOGISTS
Subject: Relocation of OWS, Proposed Smithburg Residence
Lot 8, Eagle Pines Subdivision
Pitkin County, Colorado
Job No. 11838
Dear Mr. Haberman,
As requested, we have reviewed the letter and drawing sent to us by Haberman Construction on March 15,
2000, regarding the relocation of the OWS drain field.
The OWS drain field location proposed by Haberman Construction is possible although a new subsurface
investigation and percolation test will be required. The drain field must be 10 feet from all property
boundaries, 25 feet from the proposed residence, and 130 feet from the existing well.
We can perform a subsurface investigation and percolation test after April 15, 2000. Our fees would be
$1000.00 for the excavation and testing of percolation holes and $500.00 for the redesign of the OWS, for
a total of $1500.00.
If there are any questions or if we can be of further service, please call. The project engineer for this site is
Tim Petz.
Sincerely, �Qp RE��S
CHURCH & As t��p 0 C,yG�F.Q�o
Z k7
3172—
Edward O. Churc •,,��•�.,.��
S�ONAt
EOC/trp
2 copies sent
DENVER 4501 Wadsworth Boulevard Wheat Ridge, CO 80033 CASTLE ROCK 303.660.4358
303.463.9317 Fax: 303.463.9321 EVERGREEN 303.816.1455
AC,-cnr-intPq
ENGINEERS & GEOLOGISTS
January 17, 2000
Todd Haberman Constniction
P.O. Box 1210
Basalt, Colorado 81621
LJ
Subject: Subsurface Investigation and OWS Design, Proposed Smithburg Residence
Lot 8, Eagle Pines Subdivision
Pitkin County, Colorado
Job No. 11838
Dear Mr. Haberman,
As requested, we have evaluated subsurface conditions for the site and designed an onsite wastewater
system (OWS) for the proposed main residence and caretaker/employee unit. Our firm investigated subsur-
face conditions on October 12, 1999.
SITE CONDITIONS - The lot is located in a rural residential area in Pitkin County, Colorado. The pro-
posed drain field area has a moderate slope of 12-15% to the northwest. There is a thick cover of native
grasses, scrub oak, and aspen trees in the proposed field area. There is an existing well southwest of the
proposed residence, as indicated on Figure 1.
PROPOSED CONSTRUCTION - A five -bedroom residence and a two-bedroom caretaker unit/guest
house are proposed at the locations presented on Figure 1. We are sizing the OWS based on 7 bedrooms
and 1600 Gallons Per Day (GPD) using Aspen/Pitkin Environmental Health Department (APEHD) loading
of 130 and 75 gallons per day per person, as appropriate. The loading was determined based on individual
detached structures. The main house, which has greater than 6000 square feet (SF), is proposed to have 5
bedrooms and therefore an average loading of 130 GPD/person was used to determine the average loading
of 1300 GPD. The guesthouse has less than 2000 SF, and is proposed to have 2 bedrooms, so the average
loading was based on 75 GPD/person for an average loading of 300 GPD. The design sewage loading with
a peaking factor of 1.75 for the combined OWS is 2800 GPD. This loading includes washing machines and
garbage grinders. The APEYID regulation setback to a well for the proposed loading is 202 feet. An onsite
well located 130 feet southwest of the proposed drain field will serve the residence.
SUBSURFACE CONDITIONS — A subsurface investigation was performed by digging 3 percolation
holes, 19 to 25 inches deep, and one profile pit at the location indicated on Figure 1. Subsurface conditions
in the profile pit consisted of I foot sandy topsoil underlain by sandy clay with gravel to the maximum depth
explored of 8 feet. No ground water or bedrock was observed in the profile pit. Percolation tests indicate
percolation rates of 15 to 60 minutes per inch (MPI). The average percolation rate is 35 MPI.
DENVER 4501 Wadsworth Boulevard Wheat Ridge, CO 80033 CASTLE ROCK 303.660.4358
303.463.9317 Fax: 303.463.9321 EVERGREEN 303.816.1455
OWS Design
Job No. 11838
Page 2
RECOMMENDATIONS — The OWS is proposed to include the installation of two septic tanks, a lift
station with a pump in a biotube vault, and five chamber -beds at the locations presented on Figure 1. The
OWS design is based on an average sewage load of 1600 GPD and a percolation rate of 35 MPI. We rec-
ommend the installation of one 1000 -gallon two-compartment concrete septic tank at the caretaker unit and
one 2000 -gallon septic tank at the residence to be followed by one 1250 -gallon two-compartment septic
tank/lift station with a pump in a biotube vault, as indicated on Figure 1. The pump should dose the beds
with a minimum of 400 gallons. A pump is required due to elevation differences and to distribute the
effluent through the field to increase the efficiency. The pump must be capable of discharging 30.0 gallons
per minute with a total dynamic head of 30.5. Pump details are presented in Figure 4. A distribution box
with a baffle should be installed to distribute effluent among the beds. We recommend the installation of five
chamber -beds, each with 2 rows of 15 chambers with a 4 -inch perforated SDR 35 PVC pipe to be placed
full length on the ground surface.
Our firm investigated additional OWS design alternatives such as recirculating sand filter systems in order to
minimize impact on existing vegetation. APEHD allows a maximum drain field size reduction of 30%.
Proposing an advanced treatment design would not be cost effective and would not provide additional field
size reduction.
Vehicle movement over the drain field area during construction should be kept at a minimum to
prevent compaction of the receiving soils. The bottom of the bed be scarified with a pick, shovel, or
backhoe bucket teeth prior to the addition of infiltrators.
The surface of the field should be seeded after installation of the fields. We recommend using a native seed
mix available at seed stores. These mixes do not require irrigation and develop a growth 10 to 1.5 inches
high. No automatic sprinkler system should be installed over the fields.
Based on subsurface conditions, and topographic positioning of the well and the drain fields, we believe the
setback distance can be reduced to from 202 feet to 130 feet. The resultant flow from the drain fields will
be away from the well and contamination of the well by the OWS will be prevented.
OPERATION AND MAINTENANCE
The owner must realize an OWS is different from public sewer service. The owner must be aware of,
and assume responsibility for, continued maintenance of the system. In the absence of a monitoring
program, the septic tank should be pumped every two years. Effluent filters and screened vaults, as
applicable, are to be cleaned during pumping. There are daily considerations such as not putting plastic
or other nonbiodegradable materials into the septic system. Garbage disposal use should be minimized.
The backwash of a water softener may be harmful to the OWS. A separate drywell should be constructed
for the backwash waste, if a softener is installed. Chemically treated water from a swimming pool or spas
should not be introduced to the OWS.
LIMITATIONS
A contractor, who is experienced in its installation, should install the OWS design. Our investigation, layout,
design and recommendations are based on data submitted. If subsurface conditions considerably different
from those described in this report are encountered, we should be notified to evaluate the effect on the
proposed OWS. If the health department makes modifications to this design, we should be contacted to
OWS Design
Job No. 11838
Page 3
evaluate the impact on the performance of the OWS. The county and our firm must be contacted upon
completion of the OWS
All construction is to be in accordance with the ISDS regulations. Pipe type and size, burial requirements,
septic tank construction, and other specifications, which are not depicted in our report, are to conform to
the requirements of the ISDS regulations. The installer of the system is to have demonstrated knowledge of
the APEHD ISDS regulations and requirements.
If there are any questions or if we can be of further service, please call. The project engineer for this site is
Tim Petz.
Sincerely,¢ p R it GEST
.' 0 0, �' ••,F�
CHURCH & Associat`r
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Edward O. Church, P.E. no 00
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PROFILE:
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TABLE 1 - PERCOLATION TEST RESULTS
LOT 8, EAGLE PINE SUBDIVISION DATE OF TEST: 10-12-99
Pitkin County, Colorado
fnn+ rin¢rrin4inn
0 - 1' Topsoil, Sandy, Dark Brown, Black
1 - 8' Clay, Sandy, with Gravel, Stiff, Moist, Dark Brown
NO GROUND WATER OR BEDROCK WAS ENCOUNTERED
1
AVG.
INTERVAL
HOLE DEPTH TIME DEPTH DEPTH CHANGE, PERC.
HOLE
NUMBER OF HOLE, INTERVAL, START, END, (INCHES) RATE
PERC.
(INCHES) (MINUTES) (INCHES) (INCHES) (MPI)
RATE,
24
IMPII
1
23
30
16.00 17.75
1.75
17
10
1.25
24
30
17.75 19.00
1.25
24
2.25
13
30
19.00 20.00
1.00
30
14.00
2.00
15
30
20.00 21.00
1.00
30
30
2
19
30
6.75
9.75
3.00
10
1.25
24
30
9.75
12.00
2.25
13
30 17.50 18.00
0.50
30
12.00
14.00
2.00
15
30
14.00
16.00
2.00
15
15
3
25 30 14.00 15.50
1.50
20
30 15.50 16.75
1.25
24
30 16.75 17..50
0.75
40
30 17.50 18.00
0.50
60
60
NOMBER OF HOLES.',""'i
AVG PERCOLATION RATE (MPI): 35
Remarks: Holes presoaked on 1 Q-11-99
Job No. 11838
In Page 1 of 1
To: nancy mackenzie < nancym@ci.aspen.co.us >
Subject: Profile Hole
Nancy,
At the request of Pat from Todd Habermann builders, I visited Lot 8 of Eagle Pines Subdivision to
look at a profile hole and 3 perc holes. I don't know the owners name.
I was on the property on 5/18/00. the profile hole looked good, no ground water or bedrock. It
had evidence of shallow topsoil (about 2 feet max.) and then 6 feet of clay type soil. Water was
still sitting in two of the 3 perc holes. Church is running the perc tests and designing the system.
This is FYI and to be put with the file when they apply for a permit from us. Thanks, TSD
Thomas S. Dunlop, Director
Aspen/Pitkin Environmental Health Dept.
130 S. Galena St.
Aspen, CO 81611
tomd@ci.aspen.co.us
970 920-5073 desk
970 920-5074 fax
Printed for Nancy MacKenzie <nancym@ci.aspen.co.us> 05/30/2000
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