NW Dallas-AG060202ACENDA REQUEST
ITEM CAPTION:
T H E - C T V • O F
RM COP ELL
r �o
DF Engineering
DATE: February 28, 2006
ITEM #: 10/13
Consider approval of a Resolution to amend the Interlocal Agreement with Northwest Dallas County Flood
Control District for sediment removal from box cul -verts beneath Riverchase Drive, as approved by City Council
on October 11, 2005, by revising the original cost of 45,529.30 to an amount of $87,929.82 as provided for in the
Drainage Utility District Fund; and authorizing the M iyor to sign.
APPR(
CITY C
1111 ON ABC
GOAL(S): EL
EXECUTIVE SUMMARY:
Approval of a resolution to amend the original Interk
sediment removal project beneath Riverchase Drive.
VED BY
:)UNCIL
VE DATE
Motion to Approve
Res.# 2006 - 0228.1
M - Peters
S - Tunnell
Vote - 7 -0
• Libby Ball
2006 03 0
3 15 0158
06'00'
I Agreement will allow the contractor to continue with the
Staff recommends approval of the resolution and will pe available to answer any questions at the Council meeting.
3
FINA�' AL &I 'TS: Funds are available in
Agenda Request Fon- - Revised 09/04
av, ej-
Drainage Utility Fund for this contract change.
Document Name: #DCFCD Interlocal
TO:
FROM:
DATE:
MEM
Mayor and City Council
Kenneth M. Griffin, P.E., Director
February 28, 2006
REF: Consider approval of an amendr
Dallas County Flood Control Disti
Riverchase Drive, as approved by
cost associated with the original a
as provided for in the Drainage t
sign.
On October 11, 2005 City Council appr(
Northwest Dallas County Flood Control D
culverts beneath Riverchase Drive in an an
phase of the sediment removal project perfc
first phase for sediment removal from box
City Council on March 8, 2005.
The contractor bid the second phase of silt r
Dr., anticipating that he would encounter sim
the contractor attempted to remove the sil
encountered hard packed clay with just a thin
first phase. Because of the hard packed clay,
Therefore, the divers are being required to
which takes additional time and labor. The c
from box culverts #9 and #10, which are loc
course clubhouse, when he encountered the
already mobilized and working, the NWD(
contractor could complete the work on culv
NWDCFCD contacted my office to inform
contractor had requested additional compensat
the remaining two culverts #2 and # 14.
Prior to the contractor submitting a request for
and #14 and at that time noticed not only tl
culverts, with hard packed clay, but also th
approximately 65% more than anticipated. T
higher because of the hand method, but also the
DUM
Engineering and Public Works
,nt to the Interlocal Agreement with Northwest
;t for sediment removal from box culverts beneath
'ity Council on October 11, 2005, by revising the
eement of $45,529.30 to an amount of $87,929.82
ility District Fund; and authorizing the Mayor to
I an interlocal agreement between the City and
.ct (NWDCFCD) for sediment removal from box
it of $45,529.30. That agreement was the second
ed by the NWDCFCD on behalf of the City. The
verts beneath MacArthur Blvd. was approved by
moval from the box culverts beneath Riverchase
ar conditions as the first phase. However, when
from the culverts beneath Riverchase Dr., he
layer of silt, whether than full depth silt like the
he contractor was not able to use his machinery.
complish the work using traditional hand tools,
ntractor was already working on the silt removal
,ed near the curve in Riverchase Dr. by the golf
afferent conditions. Because the contractor was
FCD authorized the change in pricing so the
rts #9 and #10. Once that was complete, the
ne about the changed conditions and that the
)n prior to proceeding with the silt removal from
additional compensation, he evaluated culverts #2
at the conditions were similar to the prior two
it the quantity of the silt to be removed was
ierefore, not only is the cost to remove the silt
total quantity of silt to be removed is greater.
The NWDCFCD has requested that the City
interlocal agreement to adjust the cost to r,
attached information shows that the origin
adjusted price is $61.02 /per cubic yard.
anticipated silt removal from culverts #2 and
from #2 and #14 is 871 cubic yards.
When the adjusted price and quantity is ca
adjust the cost from the original amount of
2005 to a revised amount of $87,929.82
completely silted in, have very little convey
flood portions of River Ridge, Riverchase E
The monies for this additional cost would
removal of silt from culverts and the free 5
management practices of our Stormwater M,
f Coppell consider an amendment to the original
love the silt from the city's box culverts. The
unit price was $41.77 /per cubic yard and the
also, the attached information shows that the
14 was 520 cubic yards and the adjusted amount
.ated, the NWDCFCD is requesting that the city
5,529.30 as approved by Council on October 11,
The existing culverts because they are nearly
e capacity. Therefore, a large storm event could
es and the apartments at Jefferson at Riverchase.
ie from the Drainage Utility District fund. The
of water is one of the activities noted in the best
; ement Plan.
Staff recommends approval of the amendmerit to the October 11, 2005 interlocal agreement
between the City of Coppell and the Northwes Dallas County Flood Control District to a revised
amount of $87,929.82 and will be available to mswer any questions at the Council meeting.
N[D NATHAN D. MAIER
CONSULTING ENGINEERS, INC.
February 10, 2006
Mr. Ken Griffin, P.E.
City of Coppell
255 Parkway Blvd.
Coppell, TX 75019
Re: Interlocal Agreement
County Flood Control
Dear Ken:
the City of Coppell and the Northwest Dallas
— Adopted October 11, 2005
As you know, pursuant to the above referenc interlocal agreement, the City of Coppell and the
Northwest Dallas County Flood Control District have been participating in a joint silt removal
project within the District. The City was to ft.nd the silt removal from two City maintained box
culverts under Riverchase Drive. The District was to fund the removal from sumps maintained
by the District on both ends of both culverts.
The Contractor bid the job intending to imple
suction equipment to remove the silt from the
It, like the north culvert is completely submer
began, it was discovered that the material was
was filled with sand that appears to have wasl
course keeps in the parking lot of the clubhou
packed clay material under a thin layer of silt
their equipment would not work. The divers 1
tools which took additional time and labor.
When the Contractor finished the southern of
Request attached hereto. The District's Boar(
the interest of preventing claims due to delays
respectfully requests that the City consider rei
Order No. 2 attached.
Given their experience with the southern cul`
the north boxes. Therefore, the Contractor is
the northern culvert from $41.77 to $61.02 pE
quantity for this box from 520 cubic yards to
of material throughout the box is the same as
the case. Our firm will be monitoring the w(
vent the standard practice of using divers with
culverts. They began with the southerly culvert.
;ed under the water in the sumps. Once they
different than anticipated. One barrel of the box
ed into the culvert from a sand stockpile the golf
e. In the remaining barrels, they encountered hard
•ather than full depth silt as expected. As a result,
ad to complete the clean -out using traditional hand
he two culverts, he submitted the Change Order
, believing the Change Order to be justified, and in
of the project, has approved it. The Board hereby
nbursing the District for the amount of Change
A, it is reasonable to expect the same condition in
;questing an increase in the unit price for cleaning
cubic yard. He also has increased the expected
71. This is based on his assumption that the depth
the openings, although that may or may not be
c as it progresses to verify the conditions.
Two Park Lane Place / 8080 Park Lane / Su *e 600 / Dallas, Texas 75231 / (214) 739 -4741
Mr. Ken Griffin, P.E.
February 10, 2006
Page 2
The Board is requesting that the City advise t e Board of the City's position with respect to the
second culvert. The Contractor has been dire ted to discontinue his efforts related to the
remaining culvert until the Board receives dir ction in this matter.
The Board appreciates the City's considerati* of these matters.
Thank you.
Sincerely,
NATHAN D. MAIER
j SUL T GINEERS, INC.
Mike Daniel, P.E., R.P.L.S.
MD /mg
Attachment 1 — Change Order Request
Attachment 2 — Change Order No. 2
01 -04 -2006 16:06 TONTO STI 9722379789
SLUDGE]
650
January 4, 2006
Northwest Dallas County Flood Control pis
C/O Nathan D. Maier Consulting Engineers
8080 Park Lane / Suite 600
Dallas, Texas 75231
PH (214) 7394741 / Fax (214) 739 -5961
Re: Change U►derjor Box Calvert Cleaning
Dear Members of the Northwest Dallas
On Friday December 9, 2005, American Under
and 10. The first thing we encountered was tha
access. Over time the slope has fallen over the
to dig a hole for the divers to access the boxes,
the opening, but this did not prove to be true, i
the boxes. On barrel No. 4 the north most bam
40 feet in to about 120 feet in to the box, this u
project was estimated based on removing sift b
changed material has prolonged the cleaning pi
additional compensation to compensate for the
production of 110 to 125 if per day, this based
Based the first set of box cleaning we have ave
requires to remove the clay and sand. This has
time to complete the north set of boxes is 20 da
attached a sketch of the north box openings tha
the planed quantity, and based on what we Pro)
Sludge Technology is requesting a change order
the extra time and equipment are requesting a n
on the north boxes to 871 cy.
lkm AM O rt »it Descri
B 570 CY Remove Sil
Adjusted 570 CY Culvert 9 d
PAGE:2
CHNOLOGY, INC.
'. Wildlife Blvd.
Prairie, Tx 7505
Flood Control District,
eater started the desifting of the boxes between sumps 9
end of the boxes were almost completely closed off to
nuance to the box culverts from the slope above_ We had
V this point we just thought the heavy material was just at
e experience heavy clay throughout the entire length of
, we encountered sand completely filling the box at abort
is due to the storm drain that come in from the street. This
im the boxes, not heavy clay and sand. The result of the
icess and required extra equipment. We are asking for
.hanged conditions. Our original estimate was based on a
n removing 18 inches to 2 feet of silt from the boxes.
rged on about 55 feet per day due to the extra work it
ost us an extra 6 days at $2,661.75 per day. The estimated
,s, this is 11 days more than we had estimated. I have
we discovered. We feel there is excessive material over
A it is the same hard packed clay below about 6" of sift.
to compensate for changed material conditions. Due to
w unit price of 561.02 per ey, and adjustment in quantity
ion Adiusted Unit Price T, old
from Box $41.77 $23,808.90
10 $61.02 $34,781.40
C1 520 CY Remove Si from Box $41.77 $21,720.40
Adjusted 871 CY Culvert 2 At 14 $61.02 $53,148.42
As soon as we encountered the heavy material
make him aware of the differing site condition
commence on the north set of boxes. Please ca
discuss any questions you might have. Sludge '
Si ou
Oaie Komarek
Project Manager
Cc: STl /fife
re contacted Brad Rusk Nathan D. Maier Engineers to
We need to resolve this change order before we
me after you read over this proposal and we can meet to
cchnology wants to resolve this as soon as possible.
CHANGE
ORDER
No.2
PROJECT: 2005 Sediment Remo
al
EFFECTIVE DATE: 01/31/06
DATE OF ISSUANCE:01 /31/06
OWNER: Northwest Dallas Countv Fl
od Control District
CONTRACTOR: Sludge Technology, Inc.
ENGINEER: Nathan Maier Consulting Engineers
You are directed to make the following changes
in the Contract Documents.
Description: Increase cost to cover unantici a
ed conditions in box culvert between Sum s 9 & 10.
Reason for Change Order: Hard clay and san
I encountered in box culvert.
ange) NA
Attachments: (List documents supporting c
CHANGE IN CONTRACT PRICE:
CHANGE IN CONTRACT TIMES:
Original Contract Price
Original Contract Times: 90 Working Days
Substantial Completion: 90 Working Days
$247,120.30
Ready for Final Payment: 100 Working Days
Contract Price Prior to this Change Order
Net Change From Previous Change Orders No. 1 to No. 1
$252,120.30
30
Days
Net Increase (Decrease) of this Change Order
Net Increase (Decrease) of this Change Order
$10.972.50
0
Days
Contract Price wall Approved Change Orders
Contract Times with all Approved Change Orders
Substantial Completion: 120 Working Days
$263,092.80
Ready for Final Payment: 130 Working Days
RECOMMENDED AP=(thufied
ACCEP
Signature) Contrac or (A�yhorized Signature)
Date: %
Engin er ( uthorized Signature)
Date: % / !- Date:
1
EJCDC No. 1910 -8-B (1990 Edition)
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Noo4
RESOLUTION OF THE CITY OF COPPELL
RESOLUTION NO. ;?00 (o GZZU• /
A RESOLUTION OF THE CITY
TEXAS, APPROVING AN AMENDMENT
NORTHWEST DALLAS COUNTY FLO(
REMOVAL FROM BOX CULVERTS Bf
THE ORIGINAL COST OF $45,529.3a
PROVIDING AN EFFECTIVE DATE.
COUNCIL OF THE CITY OF COPPELL,
O THE INTERLOCAL AGREEMENT WITH
D CONTROL DISTRICT FOR SEDIMENT
iEATH RIVERCHASE DRIVE TO REVISE
TO AN AMOUNT OF $87,929.82; AND
NOW, THEREFORE, BE IT RESTLVED BY THE CITY COUNCIL OF THE
CITY OF COPPELL, TEXAS:
SECTION 1. That the City Council a
between the City of Coppell and Northwest
removal from box culverts beneath Riverchase
amount of $87,929.82, as set forth in the amen(
eves the amendment to the Interlocal Agreement
gas County Flood Control District for sediment
ve to revise the original cost of $45,529.30 to an
nt, which is attached hereto as if set forth in full.
SECTION 2. That this resolution shall take effect immediately from and after its adoption
and it is so resolved.
DULY PASSED and approved
this the 2&VAday oft
ROBERT HAGEPV y TY ATTORNEY
the City Council of the City of Coppell, Texas on
CITY VF CO
LAS N.1.S--�TOVER, MAYOR
ATTEST:
L1BBY B ITY SECRETARY
Exhibit A
M
OV
THIS AMENDMENT IS MADE BY
corporation, hereinafter called "the City"
hereinafter referred to as "the District ".
TO
L AGREEMENT
ROM BOX CULVERTS BENEATH
BETWEEN the City of Coppell, a municipal
Northwest Dallas County Flood Control District,
WHEREAS, the City and the Distric entered into an Interlocal Agreement, hereinafter
referred to as "the Agreement', on October 1 , 2005 to effectuate their agreement for sediment
removal from box culverts beneath Riverchas Drive; and
WHEREAS, it has become necessary io amend that Agreement;
NOW, THEREFORE, in consi
agreements of the parties hereto, the City and
of the premises and of the mutual covenants and
District do agree as follows:
AGREEMENT
Article 1. Description of Amended Items
Exhibit A
Resolution of the City of Coppell (C
Agreement.
Section I.
The City and the District agree that
$87,929.82.
All other provisions of the original
and effect.
INTERLOCAL AGREEMENT AMENDMENT PAGE
ty) is attached hereto and made a part of this
City's cost will increase from $45,529.30 to
eement are unchanged and remain in full force
The signatories to this amendment v
agreement on behalf of the organization they
This Amendment shall be filed in the deed
EXECUTED this day of
Dallas County Flood Control District, and
2006.
NORTHWEST DALLAS COUNTY
FLOOD CONTROL DISTRICT
By:
Wa
President
ATTEST:
APPROVED AS TO FORM:
Attorney
INTERLOCAL AGREEMENT AMENDMENT PAGE
that each has the authority to enter into this
of Dallas County, Texas.
2006, by the Northwest
the City of Coppell adopted on the day of
CITY OF COPPELL, TEXAS
Mayor
ATTEST:
Libby Ball
City Secreta
APPROYE1� AS TO FORM:
Robert E.
City Atto: