HomeMy WebLinkAboutpitkin.eh.264536210001 (1997)Open / Pitkin Environmental Health Depart --it
Contact Log Sheet
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Contact Log Sheet
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ENGINEERS
SURVEYORS
(970)94 5-1004 Gly
FAX (970) 945-5948 SORMUESER
GORDON MEYER
November 17, 1998
Robin Morris
c/o Doug Carlston
PCO. Box 6244
Snowmass Village CO 81615
Dear Robin:
118 West 6th, Suite 200
Glenwood Springs, CO 81601
VIA FAX: 923-8805
The purpose of this letter is to provide information subsequent to my September 25, 1998,
letter regarding the Carlston residence located at Lot 6, Wildcat Ranch, Pitkin County,
Colorado.
On October 22, 1998, 1 visited the site to do some further research to attempt to determine
the cause of the ongoing problem with the individual sewage disposal system. I was met on
site by an excavator provided by Mike Thomas of Wildcat Ranch. Our task was to complete
the excavation items suggested in my previous letter.
First of all, we located the cleanout to the uppermost trench which was in place as Rudd
Construction had reported. As per plan, Rudd installed four trenches with a width of nine feet
each.
While on site, the depth of ponding in each of the trenches was also noted:
TRENCH
In
DEPTH TO
ABSORPTIVE SURFACE
DEPTH OF PONDING
Trench 1 (downhill)
58"
7" / 19"
Trench 2
50"
3" / 6"
Trench 3
52"
42" / 36"
I� Trench 4 (uphill)
47"
10"/-
0"/-
In the "depth of ponding" column, the first number indicates the depth on October 22, 1998.
The second number indicates the depth on September 24, 1998. The depth of ponding is
inconsistent in the three trenches, as trenches 1 and 2 dropped in their ponding depth while
the depth increased in trench 3. It was also noted that there was no groundwater in the
existing profile hole which had remained open for the past month. The groundwater level
previously indicated was five feet from the surface.
The concrete distribution box was also excavated and found to be level within 0.01 ft. The
three upper bed outlets are all at the same elevation. The outlet to the lower bed is 0.01 ft.
6,,_ C (WO 37y-/i,�
November 20, 1998
Robin Morris
Page 2
below the other three.
Due to the lack of groundwater existing on the east profile hole, I felt it was unecessary to dig
a hole on the west side of the system to record the groundwater depth. It was also decided
that attempting to excavate the west end of the trenches to determine their depth could result
in more damage than the value of the information we may have found. Therefore, it is
assumed that the trenches are level and the depth of cover is similar on each end of the
trenches.
It remains our contention that the depth to absorptive surface of the existing beds should be
approximately 24" to 30", rather than the 47" to 68" depth encountered on site. This depth
is two to three feet deeper than specified on the design drawings. In looking at the ponding
depths recorded in the above table, it is apparent that the trenches being built to the proper
depth could eliminate ponding in all but one trench.
I have the understanding that Rudd Construction was given a sign -off on the ISDS installation
from Pitkin County prior to obtaining a C.O. Neither the County, the owner or myself have any
record of this inspection by the County. It has also been brought to my attention that the
depth of the field is due to excess dirt from the building excavation placed on the field.
Typically, although it is not required, the contractor contacts the design engineer during
construction so that we may review the progress and/or address any field changes which
arise.
It is my opinion that the ISDS is failing due to groundwater entering the trenches. Apparently,
the groundwater source seems to be consistent year round as the system has been reported
to "leak" year round. The source of the groundwater would then seem to indicate that it is
a consistent year round source, not attributable to the leaking pond and pump system or
adversely affected by high groundwater during spring runoff. This is a changed condition from
what is reported in the Chen -Northern soils report which indicated a boring to a depth of 26
feet encountered no groundwater. This boring also encountered clay stone bedrock within six
feet of the surface of the ground. The bedrock observation is consistent with what we found
in the profile hole excavated in mid-September.
SGM would be willing to participate in resolving this situation with the owner, Rudd
Construction, Pitkin County and Nelson Environmental Wastewater Solutions. A meeting
should be set up with the parties to decide on the best course of action to proceed in. Please
call to discuss your wish.
cc: Betsey Kipp, Pitkin County Environmental Health
Mark Przbylski, Rudd Construction
Bob Nelson
Jeff Simonson, SGM
8195006a/lec
DJC
MUESER GORDON MEYER, INC.
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(970) 945-1004
FAX (970) 945-5948
September 25, 1998
Robin Morris
% Doug Carlston
P.O. Box 6244
Snowmass Village, CO 81615
Dear Robin:
ENGINEERS
SG
SURVEYORS
M
SCHMUESER
GORDON MEYER
PD
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EP 2 s 199 11
_
Etv'✓fR0"�41 !El AL H
A',PEV
118 West 6th. Suite 200
Glenwood Springs, CO 81601
On September 22 & 24, myself and Bob Nelson with Nelson Environmental Wastewater
Solutions made site visits to the Carlston residence located at Lot 6 Wildcat Ranch, Pitkin
County, CO. The purpose of our visits were to do some research to attempt to determine the
cause of the ongoing problem with the individual sewage disposal system. Last year, a
curtain drain was installed above the leach field in attempt to divert any ground water around
the leach field. Please reference the letter dated October 31, 1997. The installation of
curtain drain did not resolve of the ISDS problem.
Prior to arriving on site, Mike Thomas of Wildcat Ranch excavated three percolation holesat
a depth of 2 feet and one profile hole to a depth of 8 feet. The holes are located in the
attached sketch at the east end of the existing leach field. While percolation holes # 1 & #2
were dry at the bottom, percolation test hole #3 was moist but not wet. The profile hole
excavation consisted of approximately 3 '/2 feet of clay soil over lying approximately 4 - 5 feet
of fractures shales overlying more competent shale bedrock. Ground water was found at a
depth of 5 feet.
The results of the original soil testing done by Chen -Northern, dated January, 1993 indicated
the depth to bedrock approximately at 6 feet and no ground water was encountered to a
depth of 28 feet.
A properly designed and installed system must have a minimum separation of 4 feet from the
absorptive surface (bottom of trench) to either bedrock or ground water. The 4 foot
separation is required to properly treat the effluent prior to reaching either of these
impermeable surfaces.
Secondly, while on site the 3 clean outs on the east end of the 3 leach field beds were
removed and the following was noted:
Trench Depth to Absorptive Surface Depth of Ponding
1 52„ 36„
2 50„ 6„
3 58„ 19"
The liquid at this end of the field is not similar to the effluent breakout on the west end of the
field. The liquid on the east end of the field consists mainly of water.
September 25,'1998
Robin Morris
Page 2
These measurements indicate that the bed was constructed 2 - 3 feet deeper than indicated
on the design plans at this end of the beds. It would also mean that the original separation
from bedrock has not been maintained and that the absorptive surface is 12" or less from the
current groundwater level.
By locating only 3 clean outs, while 4 beds are shown on the design plans, it is assumed the
contractor installed 3 beds with 4 rows of infiltrative chambers. This increased width would
either decrease the separation from absorptive surface to bedrock/ground water or require that
the down hill set of chambers be constructed on fill. As stated above, there is not the
necessary 4 foot separation between absorptive surface and bedrock.
I believe the next course of action should be as follows:
Each end of the bed should be excavated to verify the depth of the absorptive surface
on the west end of the beds. This also allows us to verify that the required length and
width of system is installed. This is necessary because there is no record of Pitkin
County Environmental Health final sign off on the installation of this system. In
addition, SGM was never contacted regarding system installation or final inspection.
The distribution box should be re -excavated and verified by myself to be level.
A profile hole should be excavated on the west side of the leach field to verify depth
of ground water and bedrock.
This information should allow us to determine the cause of the leach field failure. Due to the
presence of bedrock and ground water at depths of 5 - 6 feet the current system does not
meet Pitkin County codes. We should begin exploring other areas on the property to relocate
the septic system.
The exploratory excavation needs to be coordinated such that I can be available on site
during the excavation. Please do not hesitate to call should you have any questions or
comments regarding this matter.
Sincerely,
Schmueser Gordon Meyer, Inc.
1
Dan Cokley, P.E.
DJC:k18195006A
cc: Betsey Kipp, Pitkin County Environmental Health
Mark Przbylski, Rudd Construction
Bob Nelson
Jeff Simonson, SGM
SCHMUESER GORDON MEYER, INC
k
(970) 945-1004
FAX (970) 945-5948
October 31, 1997
Mr. Doug Carlston
P.O. Sox 6244
Snowmass Village CO 81615
RE: Lot 6, Wildcat Ranch ISDS
Dear Mr. Carlston:
ENGINEERS
SURVEYORS
SG
M
SCHMUESER
GORDON MEYER
118 West 6th, Suite 200
Glenwood Springs, CO 81601
At the request of Nancy Palmer, I made a site visit to Lot 6, Wildcat Ranch, Pitkin County,
Colorado, on October 7, 1997, to observe the ISDS. Nancy had made me aware that there
has been seepage at the downstream corner of the lower most leach field bed. In addition,
she said there is an odor problem throughout the winter, that the seepage was not related to
home usage or occupancy, and was basically occurring year round. She also noted that the
stream and pond system which runs under the house had been experiencing leakage problems.
When I observed the bed seepage, it was basically a trickle from the north end of the lower
most bed. I had two ideas on the reason for this overflow. First, the distribution box which
is designed to distribute equal flow to each of the four beds could be out of level, thus,loading
one bed continually. This problem would seem to be related to home usage, however, but
was checked anyway. Rudd Construction excavated the distribution box and found it to be
level.
The second source of the problem could be groundwater infiltrating the bed area from above.
Due to the leakage of the stream system, as well as moisture in the area downhill of the
house, I believe this to be the source of the problem. The groundwater could be flowing
through the leachfield area and flushing the sewage out at the bottom. This is a very serious
problem, as the sewage could be contaminating the flowing groundwater prior to being
properly treated.
I suggested to Nancy and Rudd Construction that a curtain drain system be installed uphill of
the bed and below the house to catch any groundwater and route the groundwater around the
leach field area.
Rudd Construction made an attempt on October 8 to excavate for this curtain drain system
and determined it was too wet to complete. The result was a 1'/2 to 2 foot trench on the
uphill side which diverts surface water, but does nothing to control the groundwater below.
Another attempt was made following a week of dry weather the latter part of the following
week. Once again, the contractor deemed the site too wet. This excavation has exposed
what I believe are foundation drains which daylight above the leachfield area. This would
October 31, 1997
Mr. Doug Carlston
Page 2
contribute significant groundwater to the area of the leachfield and cause overloading of the
system.
On October 30, 1 met on site with Nancy and Betsey Kipp of Pitkin County Environmental
Health to decide on a solution and time frame acceptable to the County to complete it. It was
decided that a curtain drain would be installed uphill of the existing leachfield area. The
foundation drains need to terminate into the curtain drain trench. This solution should be
implemented in the spring. Please find attached a sketch of the curtain drain.
In the interim, all existing drain lines should be terminated into the existing trench, a 4" ADS
perforated drain pipe installed at a minimum 1 % grade and backfill with screened rock and run
to daylight a minimum of 20' from the edge of the leachfield.
Following the improvements next spring, the system should be monitored for seepage and
moisture in the leachfield area. If problems still exist, other options will need to be explored,
including lining at the downhill side of the bed, groundwater sampling and determining if
groundwater is infiltrating directly under the leachfield through the bedrock.
The contractor should notify Betsey Kipp and myself of the construction schedule so that the
improvements can be observed.
The main purpose of this letter is to provide you with a direct update on the potential
seriousness of the problem as well as the solutions proposed to rectify it.
Please do not hesitate to call should you have any questions or comments regarding this
matter.
Sincerely,
SCHMUESER GORDON MEYER, INC.
]De-- C
Dan Cokley, P.E.
DC:lc/8196-006.A
cc: Nancy Palmer, P.O. Box 6244, Snowmass Village CO 81615
Wayne Rudd, Rudd Construction, 0132 Park Avenue, Basalt CO 81621
Betsey Kipp, Environmental Health, Pitkin County, 130 S. Galena, Aspen CO 81611
HMUESER GORDON MEYER, INC,
-■-■ 10-08-1997 S=30PM FROM RUDD CONST- INC- 970 927 4027 P-1
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RUDD CONSTRUCTION, INC- 0132 PARK AVENUE, BASALT, COLORADO 81621
Phone:
Fax phone:
CC:
Date: 1 2 ``n
Number of pages including cover
sheet:
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Phone: 970/927-9119
Fax phone-- 970/927-4027 s
RE;V[ARKS: ❑ Urgent ❑ For your review ❑ Reply ASAP ❑ Please comment
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REMARKSr
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TITLE
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10-08-1997 5.33PM FROM RUDD CONST_ INC- 970 927 4027
.nelsonT- mmenzal & wastew&ter So isy itaL
VA
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September. S, 1993
SEP 3 1993
. Schmeuser� Gordon. Meyer .Engineering
100E Grand Avenue, Suite 2-E-.- -___
Glenwood Springs, CO_ 81601
Attention: Tay hammond
P_ 7
RE: Homestead Parcel 6A, Wildcat Ranch, numbered as 7605 Lake.
Wildcat Road
Dear Jay:
As requested, Nelson Environmental &ad Wastewater Solutions, Ltd_,
Performed a soils study and percolation tests to design a septic
system for the proposed residence. We conducted this study
according to Section 4-5 of Pitkin county Regulatioas Indiividual
Sewage Disposal Systems on Monday, August 23, 1993. We have based
our recemmendat ions on the subsurface Condit ions encountered_
Please furnish this letter to the Aspen/Pitkin Environmental 'llealth
Department at your earlieet convenience to obtain a permit to
construct this individual sewage system.
Proposed Construction_
The plaiznetl main residence is a relatively Iarge one to two-story
house with a bath house. ThiS is the structure for which the
percolation tests were done_ There. is also a tyro -story log house
proposed as a caretaker7s cottage_
The property is served by the treated surface water supply
furnished by the subdivision. The lot is large, and the building
envelope 12-92 acres.
Site Conditions:
The site is a lot in the 'W'ildcat Ranch PU!D 70 feet above and about
500 leer from the South end of Wildcat Reservoir.
The ground surface, which appears natural in the proposed area of
the absorption field, is on, the top of a ridge and -slopes to the
West and Northwest at a grade of 15% to 20%. There is a major
irrip'ation ditch several bundred feet above the area of the
buildings_
Subsurface Conditions:
A sail profile boring, dour by then -Northern is about 94 feet from
the proposed absorption area_ It was bored to a depth of twenty-
six feet. Tile excavation encountered no ground water_ Claystoixe
bedrock was present within six feet of the surface of the ground.
There were some loose_ shale fragments intermixed with the soil,
matrix from about eighteen inches down- The soil texture was a
PO Bove 6961 Snovanass VMagq, CO 81615 Qffioe 00) 923.3759 Home (303) 933.2766
10-08-1997 5:34PM FROM RUDD CONST_ INC_ 970 927 4027 P-8
Carlston Residence
Soils Evaluation and Percolation
Test for Individual Sewage System Design
se,ptember 8, 19gj
Pa�.ge 2
sandy clay, wird. some increase in the Clay content with depth.
The subsurface soil conditions were evalmated with the standard
percolation test procedures at the approximate location shoxu on
Fikure-1. The test holes were hand dug and several ihches of
gravel placed on the bottom of each hole. The subsoil in which the
percolation tests were run, consisted of one foot of clay loam and
then a sandy cLar, which extended to the depth of percolation test
holes, tb-ir'ty-LWC or thirty-three_ inches. This grayish soil was
well consolidated, and showed little tendency to swell, although
some smear.Lng_and compaction were observed.
Percolation Testing,
Percolation testing was Performed in the approximate location of
the proposed absorption field area Southivest of the building. The
three shallow holes were hand dug to a depth of thirty-two to
thirty-four inches_ The Percolation holes were pre-soaked the
morning of testing. Water was added approximately every two hours
before beginning the percolation test_ There was no. water
remaining in any of the percolation test holes when we arrived at
the site abort 5:30 p.m.
The results of the percolation testing are oresented in Table i_
These results indicate the sandy clay soils have an average
percolation rete of 44 minutes per inch and would be acceptable for
jllY
a conventional infiltration design for -the om-site sewage system,
if not for the shallow bedrock below. The liMitin; bedrock may
actually be deeper in the lower portion$ of the site. Further
profile excavations seem warranted to see if the soils overlaying
the hard claystoue shale bedrock are deeper than eight feet on some
portions of the site where a sewage disposal system may be located_
However, with the jaformation availabl.�e, the' Pitkin County
kegalatioas individual Scvmge WSPOsal Systems w�i 11 require a site-
specific engineering design for the on-site sewage disposal system
that addresses the shallow bedrock conditions.
Limitations_ This report has been prepared according to izeaerally
accepted practices in this area for use for sewage, disposal desiry-n
purposes_ The conclusions and recommendations submitted i3: Lhis
report are based upon data obtained from our site visits at, the
location. indicated. There is some possibility that the nature and
extent of variations in the subsurface soils across the site may
not have been evident at the time of this investigation_ If further
excavation reveals conditions different from those described.,
additional evajaations may be necessary. This office should be
advised of any unusual, situations as soon as possible so that we
may reevaluate the recommendations.
W
T-
10-08-1997 5:34PM FROM RUDD CONST. INC. 970 927 d027
P_ 9
Cerlston Residence
Sails Dvaluation anis Percolation
Tiest for Indivfdual Sewage System Design
SePttmber 8, 1993
PsJze 3
If you hale avestiora� or if we mtly be of further assistance, please
call the office_
Sincerely, Rwe B ;
Robert P. Nelson J i sen, P -E.
Presidedt n-ineering
w
r'
10-08-1997 5.35PM
FROM RUDD CONST- INC- 970 927 d02
W Property Address: 7605 Lake Wildcat Road
Legal Description_ Lot SA. Wildcat Ranch
Property Owner -
Nam Dogg CartMn
Address
Rme
00 act.0r: E'.tm ng orl ,fir,
Name Rudd Consirucklinn_ Name Same
Address 0132 Par*: s..3. Aft ss
_�satr, %v is�82t
Phone 927-9119 Phone
S�rrratiau �n�' 9�ve.�.�
o ($a d Added _2LYeS TO a 3" M r llepTh
o Daly amd TSme wesosk water Added
o �.s�auut Qf :r .`ter adc�cl
15 ggt=" Pr -.dole
o Walz in hops after pm zW
F_ok 1: vs - X NTO
Kok 2: _ Ya _ No
tick 3 --Yes Yes _X- No
Pereabtou Rate Mcamumubmt
Hale ' zz =i xt:e__Ch
Hale 7 Q IUI11Lz�&'Mrjl
.liofe 3 40 =juassfinet
a'VERAM 44-m !�h
cu-mudwate r:
Nct 5u: -Aersd
o rWST7s+ind dgih Lo blu xastmai
wate*ifuot eltoouun=dd.100 jbet
Chi
o Is zr2a balirvDd to lx subicc,� to
mtui iL a vductt A wti= 1AL-7
_ Yes x NO
Wap* M abow.a m =ma
1504to-&eN-'
Redmck
a Er c=tdared at 5 to 6 f=t
o Fated deDfh tfnnt entomtm+ d ---NIA
o TJr� of
SdudAmd x (mlystom
Same Oar
U 6 bebwc d io be pcnmea&k77
`Yes _A_No
3 cmtiy that th R above InTonnation ib Q0TT of and 1; _
oomp6te to the hest of my knowledge and that all tests tie perftimed in accordance
%A#&K : the provisions os P?tfian County Errdhm al Se -mge 13isposal tic m, sectacr, 4-
5_-i ihrougn 4-6.7_
46�-_A4_
Robert F_ Nelson
praSs 4a -jt
erl P_E_
; Uoadw. M„deer
:L4.
-� 26152
V
PO sones*t Sno%m%ass vim, Co. NOS offfM M) 923 -3MFJo=e GM) 92.3.2766
A"".
10-08-1997 S=3SPM FROM RUDD CONST. INC. 970 927 4027
N sonEnuarmmenw & wayewa i-
E
-w
TABLE i
S
PERGUL-KAON ZEST RESULT 1-uxn
Caarlston Property
Lot 6A, Wildcat Ranch
Da.tc of Percolation Test: 8123/93
P.90- Baric 69615na+wmm V llap, Co. SIMS Office OM) M-3289 Hnm,e (303) 923-2766
Length
Depth at
Depth at
Average,
Hole
hole
of Interval
Start of
End of
Percolation
No.
-Depth(in. )
(Minutes)
( Inches)
(Inches) Rate (min. /Incl1)
1
34
10
6 7/8
6 9/16
(refill)
10
6 314
6 112
(refill)
10
6 13/16
6 518
(refill)
10
6 13/16
6 5/9
(refill)
10
6 3/4
6 9/16
53
2
32
10
1 9/16
1 5/16
(refill)
10
1 11/16
1 3/8
(refill)
10
2 5/16
1 7/8
10
1 7/8
1 5/8
40
3
33
10
5 5/16
5-1/a
(refill)
10
5 9/16
5 3/8
10
5 3/8
5 1/8
(refill)
10
5 518'
5 3/8
40
Caarlston Property
Lot 6A, Wildcat Ranch
Da.tc of Percolation Test: 8123/93
P.90- Baric 69615na+wmm V llap, Co. SIMS Office OM) M-3289 Hnm,e (303) 923-2766
� 132' -rte
{��iEu�AY
FIGURE I
Carlston ProDertty
Lot 6A, Wildcat Ranch
7605 Lake 'Wildcat Road
S C -c pIWS-
0
�f
'� STiiKc'
t�LpG Emve",r" Com-)
aP3
a p- y
WFA
�I •a L7 -OV LZ6 OL6 -ONI '1SNOO cicn:j WOb� Wd9S=S L661-80-01