HomeMy WebLinkAbout1987 02 19 Workshop
SUMMARY OF WINTER SPRINGS
WATER TREATMENT PLANT IMPROVEMENTS
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Reported to: Richard Rozansky
City Manager
From:
Terry M. Zaudtke, P.E.
Conklin, Porter & Holmes - Engineers, Inc.
P.O. Box 1976
Sanford, Florida 32772-1976
February 17, 1987
.. ..
All mechanical and underground work has been completed. The electrical
work is not complete due to shipment problems of the control panels from
'Consolidated Electric. Also not completed are the concrete slabs and
fencing at the well sites.
We issued the well contract, Contract I, before the issuance of Contract
with the intent that the wells would be completed before the contractor
completed the raw water mains. Unfortunately, this did not occur. The
first problem was a communication problem with the St. Johns River Water
Management District concerning the construction permit. The second problem
was the actual construction of well 15 more fully discussed under Contract
I.
0CDNTRACT I - WELLS-
The contractor began work on well #5 at the end of September 1986 after - .
receipt of the SJRWMD pennit dated September 2, 1986. On September 30,
1986, the driller was unable to maintain the open borehole and experienced
a loss of drilling fluid. At the same time, there was a subsidence of the
outer pit casing. This well start was abandoned and the well was shifted
approximately 30 feet southwest. The cost of the false start was $7,898.00
and was processed as change order number 1.
The contract documents specified a minimum 20 lineal feet maximum pit
casing and drilling by the rotary method. It was detennined that the best
method for setting the outside pit casing was to utilize a cable tool
method and that approximately 70 lineal feet (LF) of casing were required.
During construction, 95 LF were utilized.
The hole was continued using a cable tool method for setting the 14 inch
working casing and it was detennined that at 115 feet, the limestone was
solid enough to grout the 14" casing in place. The casing was grouted and
then the driller proceeded to drill the well with the rotary method. Upon
reaching the 225 foot level, the well started producing sand and at the 235
foot level the driller discontinued drilling because a depression had
developed at the surface around the well casing. A television camera was
lowered down the hole and it revealed that sand was coming into the well at
the 225 foot level. In our letter of December 4, 1986, we discussed the
problem in depth and listed several alternatives.
On December 8, 1986, we submitted a letter to your offices with a
recommendation from Layne-Atlantic to grout this portion of the well and
seal off this sand intrusion. I This method was tried by the driller and
proved unsuccessful.
Layne-Atlantic then at first recommended slip-casing the well to below 225
feet, but later recommended that the well be abandoned. City staff met
with Layne-Atlantic and decided to proceed with a dual-tube drilling
investigation of the geology below 235 feet and the site for well #6. City
staff; Conklin, Porter & Holmes; and Layne-Atlantic believed that
additional infonnation from the dual tube drilling process was required to
make a decision on well #5. The dual tube investigation was approved by
the City Commission. The results of these two holes were analyzed by
Layne-Atlantic and Jammal & Associates, Inc. We received a letter from
Layne-Atlantic on January 27, 1987, concerning the test holes which
unfortunately asked more questions than it answered.
We then engaged the services of Jcurmal & Associates, Inc. t Rick Potts, to
analyze the borings and the events that led up to this point in time. They
provided a letter on the project which is attached. In addition to the
letter, we made a field visit and had several telephone conversations.
Within the recommendations, item 2, they recommend casing to 290 feet.
This recommendation was made because there was evidence of clay and sand to
260 feet and weaker l1mestone until the 290 level. Sand and clay mixed
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into the limestone is indicative of the Hawthorne formation. The Hawthorne
generally does not extend to this depth and finding these materials at this
depth is unusual. The Hawthorne is not considered to be a good zone for
setting a well. Common practice is to seal off as much of the Hawthorne as
possible. which generally only occurs to a depth of 90 to 100 feet. All of
the existing wells within Winter Springs are cased to around 100 feet with
no problems noted on any of these well s.
Jammal & Associates. tnc. during the field visit. believed that the Avon
Park formation (diagram attached) would produce sufficient water supply to
allow location of well #5 on the property adjacent to water treatment plant
#3. There is an approximately 300 foot separation distance available. The
standard separation distance is to utilize a 500 foot minimum. but based on
the boring samples. it was the opinion of Jammal & Assoc. that this would
not be a problem.
They al so recommended the use of 1 arger di ameter well s. This woul d resul t
in an increase in the cost of the wells. but would allow future capacity
expansion without drilling new wells or by initially installing larger
pumps and running the wells for a shorter period of time.
. J
Recase well 15 to 290 feet with a 10 inch liner. The capacity would only
be 800 gpm instead of the 1200 gpm or less anticipated. Neither Jammal &
Associates nor Layne-Atlantic recommend pursuit of this option because of
the uncertainties.
Approximat~ additional Cost:
$6,000
5,000
2,000
$13,000
This additional money would be spent without a guaranteed positive result.
Casing
Grout
Labor
2) Abandon Well #5 -- This is the recommended alternative by Jammal & Assoc.
and Layne-Atlantic
Construction Costs Incurred for Well
(see attached breakdown)
Construction Costs of of Contract II
that relate to Contract I
(see attached breakdown
Subtota 1
The cost of plugging the well in
accordance with SJRWMO Regulations
(Estimated) Total
$30,738.12 ·
$25,802.00
$56,540.12
$ 6,000.00
$62,540.12
I
3) Locate a new well #5 at the site adjacent to Water Treatment Plant No.3,
same size as currently specified.
Estimated Cost
$50,000.00
.;
4) Locate a new Well 15 at the site adjacent to Water Treatment Plant No.3,
but larger casings as recommended by Jammal & Assoc. and Layne-Atlantic
(see cost comparison attached).
Estimated Cost
5) Proceed with Well #6 as bid.
Cost
$75,000.00
$49,000.00
6) Proceed with" Well #6 larger size.
Estimated Cost
$72,350.00
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proceed with one well only. Deferring one well to next year.
Cost (size bid) $49,000.00
(larger size) $72,350.00
8) Rebid both wells. This alternative may be required if we elect to
construct larger diameter wells. The current contract would allow the City
to end the contract and begin the bidding process again. There will be
additional time and effort involved with the SJRWMD and DER to approve the
new location. Also new drawings will be required for the new site of 15
and revised specifications for bidding purposes. A number of ~he
incidental items can be eliminated by negotiating with Layne-Atlantic on a
revised price for the larger wells.
Cost
Unknown
CPH RECOMMENDATION:
A new well is definitely required for Water Treatment Plant 13. Our
minimum recommendation would be to construct a new larger well next to
Water Treatment Plant 13 as suggested by Jamma1 & Assoc. Since it is
apparent that well construction is difficult and sites are also difficult
to locate, the construction of a larger well with increased capacity would
defer the need for additional wells in the future. The construction of
Well 16 could occur in the next fiscal year, if necessary.
Attachments:
Estimated Cost for Well 15
Estimated Cost for Larger WElls
Formation Report from USGS
Jamma1 Letter of 2/10/87
CPH Letters of 12/8/86 and 12/4/86
Layne-Atlantic Letters of:
1/30/87, 1/27/87, 1/5/87, 12/8/86,
11/25/86, 11/18/86, 10/1/86
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WINTER SPRINGS ESTIMATED WELL COSTS
Item Est. Qty Unit Price
Item 1 Mobi 11 ze 1 LS $5,129.12
2 Penni ts 1 LS 300.00
3 20u Casing 20 LF 30.00
4 Cement Grouting 40 CF 10.00
520" Borehole 20 LF 26.00
6 20" Borehole 90 LF 28.00
7 14" Casing 110 LF 20.00
8 Cement Grouting
9 12" Borehole 340 LF 18.00
Extras:
TV Survey
Dua 1 Tube
Attempted Sealing of Well
Abandoned First Well
Actual Qty
95 LF
40 CF
70 LF
45 LF
115 LF
115 LF
Subtotal
Subtota 1
GRAND TOTAL
...
Total
$ 5,129.12
300.00
2,850.00
400.00
1,820.00
1,260.00
2,300.00
2,070.00
~16,lZ9.1Z
$ 2,201.00
1,600.00
2,910.00
7,898.00
$14,609.00
$30,738.12
Estimated cost of the raw water main, which will not be immediately
utilized or utilized in the near future.
Water Main -- 990 LF PVC 12" @ $18.85/LF =
Electrical -- 990 LF PVC 12" @ $7.21/LF =
(conduit and wire)
$18,662.00
7,140.00
~Z5,802.00
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Bid Price Well IS
Bid Price Well #6
$48,999.12
$49,629.12
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Division of LAYNE-WESTERN COMPANY. INC.
1107 South Orange B10UDm TraillP.O. Box 5789lOrlando. Florida 32805/Pho".: 305/423-7637 A Merley Company
October 1, 1986
Mr. Terry Zaudtke
Conklin, Porter & Holmes
500 W. Fulton street
Sanford, Fla. 32771
Re: Winter springs: Construction of Well 15
Dear Mr. Zaudtke:
RECEIVED
OCT 1 1988
CONI(UN, POi:IE:~ & HOLMEI
EN.GRS., INC.
SANt:'OQD t:'LA.
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As per our conversation on September 30, 1986,
Layne-Atlantic Company has encountered severe problems in
att~mpting to construct the well for the above referenced
project.
The specified 20' of 20. surface casing seems to be an
inadequate length to prevent caving of the formation. At
about 70' downhole, we lost circulation of the drilling
fluid four times in the past three days and have attempted
to remedy the prOblem by cementing the formation. Upon
continuing with the drilling, the surface casing .began to
drop and shift. As a result, Layne-Atlantic Company was
forced to move off the site for fear of losing the rig down
the hole.
These unexpected problems have forced us to recommend an
alternate method for installing the surface casing and
permanent casing. As per our conversation on September 30,
1986, Layne-Atlantic Company recommends that the cable tool
method be used to arive 20' of 20- surface casing and 110'
of 14- casing. Cementing would be according to AWWA
standards. This method would be based upon the Schedule of
Prices as per the contract documents.
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Page 2
Mr. Zaudtke
After successfully installing the permanent well casing, the
remainder of the project would proceed as originally
designed. The abandonment of the existing attempted .hole
has not yet been figured. Due to the unforeseen geological
conditions, Layne-Atlantic Company is requesting a change
order for $7,898.00 to compensate for the costs incurred to
date.
If you have any questions, please feel free to contact me.
Very truly yours,
L yne-Atlantic Company
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James F. Askey
Application Engineer
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Division of LA YNE.WESTERN COMPANV, INC.
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1107 South Orenge BlollOm TI'8iIIP.O. Box 5789JOrlando. Florida 32805/Phone: 306/423-7637 . A MarI.~ ~~paftV", ~ 1 : .':.1:.,. ' >.
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November 18, 1986
Mr. Terry Zaudtke
Conklin, Porter & Holmes
500 W. Fulton street
Sanford, Fla. 32771
Re: winter Springs: Construction of Well 15
Dear Mr. Zaudtke:
Enclosed is Layne-Atlantic Company's request for a change order
for the above referenced project. .
As stated in my correspondence of October 1, 1986, we encountered
unexpected problems in the construction of well 15. Therefore,
Layne-Atlantic Company is requesting compensation for trying to
install 20' of 20. surface casing and for attempting to drill
ahead. The breakdown of the costs is as follows:
AccordinQ to the schedule of Prices
11 Mobilization of GO 2000 Rig (1/2 of bid price) =
$2,564.56.
13 20' of 20. surface pipe · $600.00.
14 Grouting 20. pipe · $400.00.
15 20' of 20. Borehole (unconsolidated) - $520.00
16 50' of 20. Borehole (consolidated) - $1,400.00
Additional Work Performed
Attempting to .Squeeze. hole with cement to keep it open -
$850.00.
Additional labor above that anticipated (2 days) - $920.00.
66 additional sacks of drilling mud lost due to caving in -
$643.50.
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page 2
CPH
11-18-86
The amount Layne-Atlantic Company is requesting as compensation
totals $7,898.06. If you have any questions, please feel free to
contact me.
Very truly yours,
L Yne-Atla~anY
James ;{~
Application Engineer
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Division of LA YNE-WESTEAN COMPANY, INC.
1107 South Orange B1ollOm TI'IiIIP.O. Box 5789/Orlando, Florida 32805/Phone: 305/423-7637 A Marley Company
November 25, 19~~
Mr. Terry Zaudtke
Conklin, Porter and Holmes Engineers~ Inc.
500 West Fulton street
Sanford, FL 32771
Re: Winter Springs Well Construction: Well 15
Dear Mr. Zaudtke,
Enclosed is Layne-Atlantic Company's assessment of the problems
encountered and our recommendations for the above referenced
project.
Layne-Atlantic Company noticed sand in the cuttings from the well
under construction west of Moss Road on November 20, 1986. The
first indication of sand was at about 146' down the hole. A
second and more drastic indication of sand occurred between 222'
and 245' on November 21, 1986. While Layne-Atlantic Company was
drilling, the formation around the 20. surface pipe collapsed and
left about a 4' .cave-in. ~round the 20. pipe. For fear of losing
the rig, we moved off the location. On November 24, 1986,
Layne-Atlantic Company called in a downhole TV service to try to
locate the point where the sand was entering. While the camera
was iQ the well, a centrifugal pump was installed and the well
was pumped. The sand could be seen coming in the well at 226'.
Layne-Atlantic Company suggests two possible remedies to the
influx of sand at 226. One possible solution would be to form a
plug at about 220' and squeeze cement below that point.
Hopefully, the grout will enter and seal the point or points of
sand influx. However, there is no way to estimate how much cement
will be needed or if, indeed, that point can ever be sealed.
Another hazard exists in that the cement could also seal off the
water producing zones. Fortunately, Layne-Atlantic Company
suggests another possible solution. A 12. liner could be installed
from 100' .to 230'. Hopefully, this would seal the open hole from
230' to ground level. Unfortunately, the water producing zone (if
any) between 115' and 230' would also be sealed. There is also no
guarantee that additional sand-producing zones wil:l not be
encountered somewhere else down hole. -~}~~u t:r';'i~~~r;:;~'.~'lfi'~
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Mr. Terry Zaudtke
November 25, 1986
Layne-Atlantic Company will proceed with the construction once a
possible solution is acceptable. It must also be noted that
additional compensation will be requested upon acceptance of a
remedy.
If you have any questions or if you request a meeting, please
feel free to contact me.
Very truly yours,
Layne-Atlantic Company
James F. Askey
Application Engineer
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500 w. FULTON STIlHT
POST OFFICE 1011 ,en
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December 4, 1986
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Mr. Richard Rozansky
City Manager
City of Winter Springs
1126 E. State Road 434
Winter Springs, FL 32708
Re: Winter Springs Well Construction
Contract 1 - Construction Administration
CPH Job No. W0405.00
Dear Mr. Rozansky:
On November 24, 1986, we received a telephone call from
Layne-Atlantic stating that they were having some difficulties
at the well site. We have previously provided you with a letter
from Layne-Atlantic outlining the problems they encountered at
the site. Upon receipt of their letter, we contacted several
individuals to discuss the problem and to receive their
professional opinion on the project.
The United States Geological Survey (USGS) provides information
on the subsurface conditions in Central Florida. We contacted a
Mr. Lou Burgess and a Mr. Charles Tibbals at the USGS for their
evaluation of the situation. Mr. Burgess is an experienced well
driller in Central Florida and works on a contract basis with
USGS. We questioned him as to whether he has encountered this
type of problem before in a well, and he said that it was rare
but that he had, and his ~lution was to provide a casing down
through such a zone. He stated that we could, as an
alternative, use grout to seal off the area, but that this was
less positive. Mr. Burgess, however, referred any
hydrogeological questions to Mr. Charles Tibbals. We contacted
Mr. Tibbals the following day, and it was his opinion that the
sand at 1451 and 225' were not related to the surface cave-in
around the 20. pipe. He stated that it was unlikely in this
area that such a connection was feasible. He felt that the
change in the surface around the 20. casing was due to
conditions above the 951 level and unrelated to the pumping of
the well.
We .contacted Rick Levine, hydrologist for the St. Johns River
Water Management District, and discussed the situation with
him. He was of the same opinion as Mr. Tibbals. Please keep in
mind that we have no written confirmation of their opinions.
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POST OFFICI lOX 1t71
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1 2/4/86
Mr. Richard Rozansky
City of Winter Springs
Page 2
We contacted Mr. Bob Oros of Jammal , Associates, who is a
professional hydrogeologist. Mr. Oros gave us a different
opinion than Mr. Tibbals. It was his opinion that there was a
possible connection through the limestone to the 95' level where
the 20. casing had been placed, and that sand was apparently
migrating along the 20. casing down to the aquifer and into the
open bore hole at the 225' level. We 'explained to him that the
piezometric water level within the well was considerably nigher
than the water level in the groundwater around the well. He
stated that once the earth collapsed around the 20. casing, it
could have sealed off any possible groundwater flow from the
aquifer along the casing, thereby eliminating a hydraulic
connection between the aquifer and the upper groundwater table.
We also contacted a Mr. Jerry Price, who performs logging of new
and existing wells. We inquired as to whether this logging
would tell us if there was a connection between the aquifer and
the ground surface. He stated that, although he would like to
tell us that SUCh equipment was available at the present time,
his equipment would not accurately tell us wnether or not there
was a connection between the two strata.
There is a possibility that if the two areas are not
interconnected, the 225' level would provide an excellent source
of water supply for the well. However, since there are
questions that remain, we Iwould like to discuss the pros and
cons with you and Mr. Doug Taylor at your earliest convenience.
We have requested approximate costs for a new lining down to the
230' level which should help us evaluate the situation.
If you have any questions, please do not hesitate to call.
Si ncerely,
PORTER & HOLMES-ENGINEERS, INC.
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Pump cavern area and develop well.
Pro:
1 .
Tibbals I Levin both say the sand at 145' and 225'
are not connected with the surface depression.
2. Open caverns generate a considerable volume of
wa ter.
3. Water level in the well is not the same as the
groundwater level.
Con:
1 .
Possible collapse of the entire well if Oros is
correct.
2. Possible contamination from surface if there is a
connection.
3. Possible collapse elsewhere on-site.
Solution
Install slip casing.
Pro:
1.
Definitely will seal off the area and eliminate
collapse potential.
Increased cost of extending casing.
Con:
1 .
Solution
Pressure grout.
Pro: 1 . May seal area only around 225' cavern and not
eliminate the whole water producing zone. ...
Con: 1 . Increased cost.
2. Unknown quanti ty of grout required.
3. Unknown results.
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. 500 W. FULTON STRUT .'
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1986
Mr. Richard Rozansky
City of Winter Springs
1126 East S.R. 434
Winter Springs, FL 32708
Re: Winter Springs Well Construction
Contract 1 - Construction Administration
CPH Project No. W0405.00
Dear Mr. Rozansky:
On December 4, 1986, we sent your offices a letter outlining our
investigation of the probable corrections to the well located
near water plant no. 3. Pursuant to this letter, we talked to a
Carl Nuzmanwho is the chief engineer and hydrogeologist for the
Layne-Atlantic Company in Kansas City, Kansas. After
discussions with Mr. Nuzman, he recommended that we backfill the
well to approximately the 230' level and then grout from 220' to
230'. After the grout has been allowed to set, they would go
back in and drill through the grout and continue working on the
well. Mr. Nuzman believed that this would solve the general
subsidence problem around the top of the casing and would
eliminate any connection that may .exist between this groundwater
aquifer level and the upper level. In addition, he stated that
they would want to use the Bentonite seal around the upper
casing and fill in the area to prevent any further leakage down
into the aquifer. After this telephone call we contacted the
people we had previously talked to in the St. Johns River Water
Management District and the U.S. Geological Service (USGS). Mr.
Levin agreed with the procedure and said that it would be
acceptable to the St. Johns River Water Management District;
however, Mr. Tibbles was not available for comment as he was on
annual leave. We believe that Mr. Nuzman's recommendation is
the proper way to proceed on this well and have asked him for
written confirmation of his recommendation. Should you have any
questions concerning this letter, please do not hesitate to call
our offices.
-
Sincerely,
PORTER & HOLMES - ENGINEERS, INC.
Ter
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Division of LAYNE-WESTERN COMPANV. tNe.
1107 South Orange B10u0m Trell/P.O. Box 5789lOrlando. Florida 32805/Phone: 305/423-7637 A Marl.y Company
December 8, 1986
Mr. Terry Zaudtke
Conklin, Porter and Holmes
500 West Fulton street
Sanford, Fla. 32771
Re: Winter Springs Well Construction: Well 15
Dear Mr. Zaudtke:
Enclosed is a confirmation of your instructions as to the
procedures for the construction of the above referenced project.
As per our conversation, a potential remedy has been discussed.
This includes the addition of sand from 245' to 235' with a
cement and sand grout mixture added from 235' to 220'. Next, a
bentonite mixture will be placed in the subsided area next to the
24" surface casing and allowed to flow down the casing. Finally,
a cement grout mixture will be added to the subsided area. The
cement mixture will be allowed to cure before drilling the plug.
Hopefully this will stop the sand migration during pumping.
If you have any questions, please feel free to contact me.
Very truly yours,
Layne-Atlantic Company
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Applicati~n Engineer
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DEe 10 1988
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Division of LA YNE.WESTERN COMPANV. INe.
1107 South Orange B10llDm TI'8iI/P.O. Box 5789lOrlando, Florida 32805/Phone: 305/423-7837 A Marley Company
January 5, 1987
Mr. Terry Zaudtke
Conklin, Porter & Holmes Engineers
500 W. Fulton street
Sanford, Florida 32771
Re: Winter Springs Well Construction: Dual Tube for Wells .5 &'6
Dear Mr. Zaudtke:
Enclosed are Layne-Atlantic Company's estimates for the dual~tube
test holes for wells 15 and 16. Also enclosed is an additional
change order request for the costs incurred in running the TV
survey and performing the plugging remedy on well 15.
The meeting on December 23, 1986 at the City of Winter Springs
resulted in giving Layne-Atlantic Company the -go ahead- to drill
a test hole at the proposed site of well 16 and to drill a test
hole in the already partially-constructed well 15. The prices to
construct the test hole at well .6 is estimated to be $4,320.00.
This price consists of mobilization, demobilization and the
actual drilling and taking of samples to a total depth of 450'.
The price to drill a test hole in well 15 is estimated to be
$1,600.00. This test hole will be drilled to the total depth of
450' also. After the construction of these test holes and the
inspection of the formation samples, further recommendations will
be provided as to the construction procedures and possible
solutions.
A request for additional compensation of $5,111.00 is also being
submitted. This request is for the TV survey performed on
November 22, 1986 and for the attempt to plug the sand-producing
zone in well 15.
* TV Survey with Field Superintendent
* Cement/Bentonite plugging of Well 15
= $2,201.00
· $2,910.00
If have any questions, please feel free to contact me.
V ry t7~
() James F. Askey
Application Engineer
)( c.. : f(,t'Jvu.J. 1i.o7.~' /c.y
~ ~ ~~.......T4...'.....4j............. lor
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~ne:f/t/antic Company
F,'(e
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Division of LAYNE.WESTERN COMPANY, INC..
1107 South <lrIN1ge B10llDm TraillP.O. Box 5789/Orlando, Florida 32805/Pho....: 305/423-7637 A Marie ' .. ~.~;~~.. .\1'~..... .;:-.~. >;"'"..
l!t" i ". ,'. .... It . .
January 27, 1987 .:..i~lMi ....\; ii. "':o.$;.J~
J AN 23 1981
Mr. Terry Zaudtke
Conklin, Rorter and Holmes Engineers
500 West Fulton street
Sanford, Florida 32771
CONI~!1~t ?c-r, i c.i\ ~ nlln.M~
EhGKs.. me. '
$AHFORO. . ,...... /
Re: Winter Springs Well Construction: Dual Tube Results,
Recommendations
Dear Mr. Zaudtke:
Enclosed are some recommendations based on the dual-tube drilling
from 1/5/87 to 1/23/87 for the above referenced project.
The formation samples collected by Layne-Atlantic Company on well
.6 indicate good limestone from about 120' down to 400'.
However, at 400' the ground subsided considerably. It seemed so
unstable that we were forced to remove the drilling rig from the
location. Some possible causes of the subsidence are as follows:
A dredging zone somewhere between the surface and 400'
resulted in excessive removal of water and cuttings. This
caused the surface to collapse due to the lack of supporting
material.
An inter-connection from 400' (or nearby) to the surface.
Regardless of the causes for the surface subsidence, the question
that arises is, what is going to happen if a well is constructed
and pumped at full capacity? Will a sinkhole develop?
Layne-Atlantic Company's recommendations concerning well .6 are
to move to a location greater than 30' from the original location
and attempt to construct a well using the cable-tool method. We
would install approximately 80' of surface casing and 130' of
inside casing. The remainder of the well would be open hole to
about 450' ..It is also our recommendation to increase the
diameter of the well to at least 20. in order to decrease the
upward velocity of the pumped water, to allow for future
expansion and to allow room for a re-liner if it is necessary.
Again, there is no guarantee that a cave-in or ground subsidence
will not occur at another location. It may also be very
difficult to ~evelop a well in this area due to the possibility
of large cavities containing very fine limestone.
Cliw~
let .
"'-"'""
The dual tube drilling at well IS proved to be a little more
conclusive. Based on what has transpired and on the formations
encountered, Layne-Atlantic Company's recommendation is to
abandon this well and find another location (preferably nowhere
near the present one). It seems that there are too many .ifs.,
all of which could lead to problems and a great expense. The
dual-tube drilling indicated a lot of very fine limestone that
could have been dredged from large cavities. If so, this would
indicate a well that would be very difficult to develop and also
a possibility of developing a sinkhole during pumping. Also, at
440', there were cuttings and water wbubblingW around the outside
of the cement and casing at the surface and also 30'-40' from the
well. To Layne-Atlantic Company, this indicates a very unstable
formation. Again, the question arises as to what will happen
when the well is pumped.
An attempt to finish construction on this well could be made.
The sand-producing zone at 226' would have to be sealed. This
would entail installing a l2W liner to at least 240'. We would
attempt to drill ahead to 240' with a cable-tool rig, install the
liner and pressure grout from the bottom to the surface. The
cable-tool method is only feasible if the hole will stay open.
If the borehole continues to collapse, a rotary rig would be set
up on the hole. We would then attempt to drill the hole using the
mud rotary method. Hopefully, the drilling fluid would allow the
hole to stay open long enough to complete the pressure grouting.
The remainder of the ~ell could be done by either the cable-tool
or rotary method.
There are several possible methods f?r the completion of the
project. However, each solution 1S relatively risky.
Layne-Atlantic Company will continue with the project upon
suitable instructions. If you have any questions or request a
meeting, please feel free to contact me.
Very truly yours,
^ La, e-At7zany
James F. ASke~
Application Engineer
JFA/ba
page 2
Conklin, Porter and Holmes
January 27, 1987
/
.
,'''''
20.
'..
"ne::f/t/antic Compang
~
Division of LA YNE.WESTERN COMPANY. INC.
1107 South Orange 810llDm TraillP.O. Box 5789/Qrlando. Florida 32805/Phone: 305/423-7837 A Marley Company
January 30, 1987
,.~. ..
""~.9'f
. . ,,',... -~.~ ~~"r
&~.;.. "~}.. ,- ,-' "'1.;':~ t....,.,
~': ;..; .;\;:~ 1:<. ~..' :~:!'~ ~',. .~~:..
.~. ... "'~.~ ;.,~.loA ~l ~
~... ;;no.' ~-.. ."
'i:>t..,lIt......' ..
Mr. Terry Zaudtke
Conklin, Porter and Bolmes, Engineers
500 West Fulton street
Sanford, Florida 32771
Re: Winter Springs Well Construction:
Alternate Construction for Well .6
Dear Mr. Zaudtke:
I: l= ~ Z ,gl31
r _0
~.-R :a \10U6ES
.."': ""', PO.'. \ to
\tI11"-'" ,'1':,<" \t~c.
Ei.U.~\,,",.'
~fOR'J, f\..'-
Enclosed is Layne-Atlantic Company's estimate to increase the
size of the proposed well in the above referenced project from
14. to 20..
As stated in my correspondence dated January 27, 1987, it is our
recommendation to increase the size of well .6 from 14. to 20..
If this is found suitable, the schedule of prices for well .6
will be adjusted as follows:
----
Item
25
26
27
28
29
30
31
32
33
~~
Description
/
Mob, Demob, Facil.
Bonds, Warranties,
Misc.
80', 30. Bct:ebole,
GRcQRsel. Sc..&-('~e.
Omit ~t;I~
80', 30. Borehole,
Consol.
50', 30. Borehole,
Consol.
130', 20. Casing
Installed
500 sks. Cement
Installed
320', Nominal 20.
Borehole
Unit Price
$10,991.00
$ 300.00
$ 77.00/ft.
$ 47.00/ft.
$ 53.00/ft.
$ 4l.00/ft.
$ 9.00/sk.
$ 30.00/ft.
l .
Amount
$10,991.00
$ 300.00
$ 6,160.00
$ 3,760.00
$ 2,650.00
$ 5,330.00
$ 4,500.00
$ 9,600.00
1.- 9.J . ~~I- _"'~'"
-
-
lIIfIIlI_.F'~_~~'C-
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page 2
CPR
1/30/87
The total for these items (to drill the well only) is estimated
to be $43,921.00. An add/deduct of $485.00 is offered for each
day more/less than the estimated 37 days to drill the well. The
remainder of the project (from item 34 to completion) would be as
originally proposed.
If you have any questions regarding this project, please feel
free to contact me.
JFA/ba
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FEB 12 1987
--
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CONj(UN. POR;c:a &H~S'
ErlGRS., INC..
JAMMAL & ASSOCIATES, INC. Consultin''trf~~li.&LA.
) .
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February 10, 1987
Project No. 87-03023
TO:
Conklin Porter and Holmes, Inc.
500 West Fulton Street
Sanford, Florida 32771
SUBJECT:
Attention: Mr. Terry Zaudtke, P.E.
New Well Construction, City of Winter Springs,
Seminole County, Florida
Dear Terry:
As you requested, we have
/
concerning recent attempts to
the City of Winter Springs.
consisted of:
reviewed available information.
construct two (2) new wells for
The information we had available
1.
Formation cuttings
220 - 440 feet for
test hole '6.
(samples) from the depth interval
well'S; and from 0 - 400 feet at
2.
\ .
\
. Borehole video,log to a,depthof~45 feet in well'S.
l~
...., I
Letter' from'Layne - Atlantic' Company "describing
:";~J' observ~t'ion'~' at ':;'ell '.is'~~d at test hole' '6. .'.
~ "{,
,"\ ..~.~ ~..~ . .~;~ \" ";:~ilIf-. '''-''''''''-''~'"~H''''~
~:,,\":, L.~-'''-'~'''';'''''''.'''\'>'', ' , .~ ; ,.~", - . . .:~F'1"'l ,:.-.,,{}tf.:,L';~,~.:-:;'::,~.,?;~
~i;.Geot8CI.."1iaII Engineers. HydrogeologicConsultan~ & Materials Testing Engineers,', ,r', ";:,.".i.;}r'rt":,, .
1675L.. Road. 32789 . p.o~ Box 339. Wint.,.,..,.. FIorids 32790 . TfII.phone (305) 645-5560,;<:/7'tK;"."r:
::tf~~:z-~~;r-llornpo.CbI&-, :."." ",:
A;~
-Conklin Porter and Holmes, Inc.
Kew Well Construction, City of Winter Springs,
Project No. 87-03023
-2-
In addition to the above information. we visited each well site
~and reviewed the topographic features of each area to ascertain
if unusual geologie conditions were expressed at land surface~
Based on the information available to us we offer the following
recommendations for your consideration.
1. We recommend that well'S be plugged and abandoned and
a new well site selected. Reworking of this well is
feasible. however. the description of events provided
by Layne - Atlantic and our experience with similar
situations suggests that the expense to rework the well
would be large and that the probability of reworking
the well successfully would be low. A successful well
in this instance is defined as a well which can produce
an economical quantity of water. free of sand or other
particles. Layne - Atlantic's description of events
I
suggests that the integrity of the casing grout has
been lost.
2. If consideration is given to rework well '5, we
recommend installation of a liner with a maximum
outside diameter of. 10 inches. This liner should
extend to a depth of at least 290 feet and be
completely pressure grouted in-place from b~ttom'. to
top. Again. we do not recommend that you pursue this~
OPt10n'~~~~*~FL . 0 .
Based on ."evaluat10n .of the cuttings from test
we: recommend that you move the proposed well s
"
... "~.'
QL., .
. Conklin Porter and Holmes, Inc.
New Well Construction, City of Winter Springs,
project No. 87-03023
-3-
far as practical from the test hole location and
construct a new well using a combination of cable-tool,
mud-rotary and reverse-air rotary drilling methods. We
recommend starting with a minimum 24-inch diameter pit
casing driven to refusal. A second string of IS-inch
working. casing is recommended from land surface to a
depth of approximately 230 feet. Mud and/or
reverse-air rotary methods are recommended to drill the
borehole to set the IS-inch casing, depending on
conditions encountered. The above described casings
are a bit oversized given the desired well yield of
1200 gpm, however, should sand-pumping or caving
conditions become apparent, the well could be sleeved
with a telescoped 12-inch liner and not materially
reduce the yield potential.
4. In light of the problems experienced during well
I
construction and the somewhat troublesome geologic
conditions that exist in the Winter Springs area, we
recommend that a hydrogeologist, experienced with deep
./
well construction, be present on-site during critical
periods of future well construction. - This individual
should be responsible for field recommendations
concerning appropriate casing depths depending on
actual geologic conditions encountered.
.6 suggest thai ',the _,Av~n
M" ,'t_,' ~< ' , . ".,' f. t 1,.t~. ~ ,
,:~.J~','''' ':;' ,
aspects of future~weil
working casing and the
! ~ -.1'"
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'- .,,-
.Zt'
---'\1
~'Conklin Porter and Holmes. Inc.
New Well Construction. ~ity of Winter Springs.
Project No. 87-03023
-4-
grout seal between this casing and the adjacent geologic
formations.
Topographic map information of the area indicates that both well
sites are adjacent to natural stream basins. Without further
data. we can speculate that these channels may reflect the
existence of jo~nts. fractures or faults in the underlying
limestone formations. These conditions can lead to well
construction problems. The information available at this time
does not allow us to conclude if this is a factor or not,
however. if possible, new well sites away from these features
may prove more amenable to well construction.
We trust that our recommendations will prove useful to you and
help assure successful well
questions or require further
willing to help.
construction.
information,
If you have any
we are more than
Sincerely.
JAMMAL & ASSOCIATES, INC.
~
Richa ~ L. Potts, Jr.
Senior Geologist
RLP/:jc
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