1987-2170923L
AN ORDINANCE AUTHORIZING THE EXECUTION OF A CHANG5 ORDER TO A
CONTRACT BETWEEN THE CITY OF DENTON AND TONTO CONSTRUCTION, INC ,
AND PROVIDING AN EFFECTIVE DATE
WHEREAS, on February 17, 1987, the City awarded a contract
for the construction of certain improvements to the Water
Treatment Plant Upgrade Phase II, Bid No 9657, and
WHEREAS, the C~ty Manager having recommended to the Council
that a change order be authorized to amend such contract and said
change order being ~n compliance with the requirements of art
2368a, V A C S , NOW, THEREFORE,
BE IT ORDAINED BY THE COUNCIL OF THE CITY OF DENTON
SECTION I That the change order to the contract between the
C~ty and Tonto Construction, Inc ~n the amount of Twenty-n~ne
Thousand Eight Hundred and Two Dollars and Fourteen Cents
($29,802 14) is hereby approved and the expenditure of funds
therefor ~s hereby authorized
SECTION II That this ordinance shall become effective
~mmedlately upon ~ts passage and approval
PASSED AND APPROVED thls the 1st day of December, 1987
ATTEST
CITY SECa .TARY
APPROVED AS TO LEGAL FORM
DEBRA ADAMI DRAYOVITCHt CITY ATTORNEY
DATE December 1, 1987
CITY COUtlCIL REPORT
TO. Mayor and Members of the City Council
FROM Lloyd V Harrell, City Manager
SUBJECT CHANGE ORDER #6
TONTO CONSTRUCTION~ INC
RECOI~IEtlDATIOtt We recommend this Change Order l/6 in the amount of
$29~802 iQ to Tont~) Construction, Inc be approved
.~UI~RY This change order Involves the replacement of a caustic soda
tank in conjunction with the Denton Water Treatment Plant upgrade
The Public Utlhty Advisory Board has approved this change
order
..B/tCi(GROU~ID Memo o! December 1, 1987
Proposal from Tonto Construction
_PROGRAI~ DE?ARTNENTS OR GROUPS AFFECTED
Water Treatment P/ant Upgrade Phase I!
_FISCAL H1PACT 1987/88 Water Utility Bond Funds
Account tt 623-008-0/~60-9t01
Respee. x~l ly submttted
Lloyd V Harrell //
City Manager
Prepared by
Tom s ,w, c P
TI t-I e Assistant Purchasing Agent
Approved
~T~ t]a. Purchasing Agent
Dec~ ')er 1, 1987
CITY COUNCIL AGENDA ITEM
TO CHAIRMAN AND MEMBERS OF THE PUBLIC UTILITIES BOARD
FROM R E Nelson, Executive Director of Utilities
SUB3ECT CFtANGE ORDER t1~- (Caustic Tank-TONTO CONSTRUCTION
INC ) WATER TREATMENT PLANT
RECOMMENDATION
The Public Utilities Board, st their meeting of November 18, 1987,
recommended Lo the City Council approval of the attached change order
#6 concerning replacement of e caustic tank in conjunction with Phase II
Upgrade of the Denton Water Treatment Plant Project in the amount of
$29,802
SUMMARY~
The existing fiberglass sodium hydroxide tank has been seriously leaking
after several attempts at repairs by the tank manufacturer The existing
tank needs to be replaced by a polyethylene tank of the same size and
capacity as soon as possible
BACKGROUND
In 1981~ a fiberglass tank was installed at the Water Treatment Plant for
the purpose of changing over to liquid sodium hydroxide (caustic) for
adjusting the Ph of water In the treatment process Since that tlme~ the
fiberglass tank has been subjected to this highly corrosive chemical and
has not withstood the deterioration even after several repairs were made
by the tank manufacturer Since that time, the water treatment Industry
has developed a more chemically Inert tank using polyethylene
Polyethylene does not react with sodium hydroxide and has been found to
be highly suitable for containing this highly corrosive chemical
The Utilities Staff needs to get this unsatisfactory tank replaced at this
time by Tonto Construction Company as a part of the Water Treatment
Plant Phase II upgrade contract This tank is in danger of rupture which
could result In a possible shutdown of the Water Treatment Plant
5168U 9
Pegs 2
A second tank of polyethylene material has recently been Installed by
Tonto Construction Company as part of this project However~ the
Utilities Staff thought that the existing hber§iass tank could be salvaged
by further repairs which has proven not to be the case
PROGRAMS~ DEPARTMENTS OR GROUPS AFFECTED
City of Denton, Denton Municipal Utiiltles~ Engineers and Contractors,
and the c,tlzens
FISCAL IMPACTi
Previous Contract Amount $3,618,309 27
Net increase in contract ami !
for tank $29t802 l~
Revised Contract Amount $3,648,111 41
Net change in contract t,me of completion- no change
R~l/pect fully submitted,
City Manager
Prepared & Approved by~
TR E Nelson, Executive Director
Department of Utilit,es
Exhibit I Change Order tt6
Minutes PUB Meeting of ll/18/87
5168U~9-10
TC 114-042
October 14, 1987
Nr C David Ham, P E
Director of Water &
Wastewater Utilities
Service Center/Warehouse
901-A Texas Street
Denton, Texas 76201
RE Denton Water Treatment Plant
Upgrade - Phase II
SUBSECT Change Order No 6 (Caustic Tank)
Dear Hr Ham
Please find attached five (5) copies of Change Order No 6
regarding the new caustic tank additions for your executzon
Please return a fully executed copy to us upon your approval
Sincerely,
TONTO CONSTRUCTION,
Glenn A Landry ~
Vice Preszdent
GA/rmo
Enclosure
2417 WEST PARK ROW · SUITE 200 · ARUNOTON TEXAS 78013 · PHONE (817) 4~0 0866 · METRO 461 6833
PROJKCT Denton water Treataent Plant Upgrade - Phase 2
CONTRACT No 9657
OWNKR Czt7 o£ Denton, Texas
CONTRACTOR= Torito ConstructLon Co
CHANGE ORDER NO SLx (6) DATE October 6, 1987
CHAJIQS OR ~XTRA WORK TO BE PERFOR2~D
Contractor to replace the existing /lberglass sodium hydroxide tank
wzth a polyethylene tank gE the sams s~ze and capacity as speciE,ed ~n
Section 11234 of the Contract Speczf~catzons The tank is to be
· nsulated, heat traced and ~s to meet all other provis~ons of the
contract dra#~ngs The tank ia to be provLded wLth appurtenances of
the same size and location as the tank which Ls to be replaced The
contractor is to ensure that the heat tracing on the new tank Ls
compatible with existLng cLrcu~t breakers and w~r~ng which wan provided
for energL~zing the heat tracLng on the ex~st~ng tan~ or w~ll make
revls~ons as necessary to accommodate the new tank
The ex~st~ng tank is to be relocated to the Czt¥ of Denton Waste~ater
Treatment Plant and be set Ln the storage yard located near the pole
barn
Amount to be Added $ 29,802 14
The compensation agreed u~on in ~hls Chan~e or SxCrs Work Order ~s a
full. tom,lace and f~nal ~eYmen= £or all costs Che Con~rac~or may ~ncur
as a resul~ of or relating ~o ~h~s change whether sa~d costs are known.
unknown, foreseen or unforeeen a~ Chis ~me. ~nclud~ng w~=hout
llm~aclon, any c~s~ for del~y, ex~ended overhead, r~la or ~mpac~
cos=. or any other effect on chan~ed or unchanged work as a result of
=h~s change or Sxcra Work Order
PrevLous Contract A~ount $ 3 618 30
,.t
Revxaed Contract A~ount $ 3.648.111 41
Net Change In Contract T~aa of Co~pletlon No Change
~av~sed contract tiaa o£ complet=on June 2~1988
FREESE AND NICHOLS,
By ~ By
EXCERPT FROM MINUTES
PUBLIC UTILITIES BOARD
November 18, 1987
CHANGE ORDER #6 - (CAUSTIC TANK~ TONTO CONSTRUCTION INC ) WATER
TREATMENT PLANT (Sam)
Ham introduced this item stating that the existing fiberglass
sodium hydroxide tank has been seriously leaking after several
attempts at repairs by the tank manufacturer The existing tank
needs to be replaced by a polyethylene tank of the same size and
capacity as soon as possible
Previous Contract Amount $3,618,309 27
Net increase in contract amt 1
for tank $29,802 14
Revised Contract Amount $3,648,111 41
Net change in contract time of completion- no change
LaForte made a motion that the Board recommend approval to the
City Council for change order %6 in the amount of $29,802 14
Second by Thompson All ayes, no nays, motion carried
EXHIBIT_,