1994-005e:\~pdocs\o~d\chgo~de~.o
AN ORDINANCE AUTHORIZING THE EXECUTION OF A CHANGE ORDER TO A
CONTRACT BETWEEN THE CITY OF DENTON AND GRACON CONSTRUCTION
COMPANY; PROVIDING FOR AN INCREASE IN THE CONTRACT PRICE; AND
PROVIDING AN EFFECTIVE DATE.
WHEREAS, on July 21, 1992, the city awarded a contract for the
construction of certain improvements to Pecan Creek Wastewater
Treatment Plant in the amount of $8,647,000.00; and
WHEREAS, the city Manager having recommended to the Council
that a change order be authorized to amend such contract with
respect to the scope and price and said change order being in
compliance with the requirements of Chapter 252 of the Local
Government Code; NOW, THEREFORE,
THE COUNCIL OF THE CITY OF DENTON HEREBY ORDAINS:
SECTION I. That the change order increasing the amount of the
contract between the city and Gracon Construction Company, a copy
of which is attached hereto, in the amount of Forty-six Thousand
Dollars ($46,000), is hereby approved and the expenditure of funds
therefor is hereby authorized.
SECTION II. That this ordinance shall become effective
immediately upon its passage and approval. ~
PASSED AND APPROVED this the ~day of , 1994.
BOB CASTLEBERRY, MA7 ~
ATTEST:
JENNIFER WALTERS, CITY SECRETARY
APPROVED AS TO LEGAL FORM.
DEBRA A. DRAYOVITCH, CITY ATTORNEY
DATE: JANUARY 4, 1994
CITY COUNCIL REPORT
TO: Mayor and Members of the City Council
FROM: Lloyd V. Harrell, City Manager
SUBJECT: cHANGE ORDER # 19 FOR WASTEWATER TREATMENT pLANT (GRACON
CONSTRUCTION -- P.O. # 26052A)
RECOMMENDATION: Council approve change order #19 in the amount of $46,000.00
to Gracon Construction Inc. for the Wastewater Treatment Plant Improvement
contract.
SUMMARY: This change order is for the installation of two (2) grinders, one on
each grit pump at the suction pipe. These grinders cut into fine pieces any debris
which clogs the grit pumps and degritter equipment. (See Public Utilities Board
Agenda Item memo dated 12-15-93 for more detailed information) ·
BACKGROUND: Public Utilities Board Item Memo, Change Order #19.
PROGRAMS, DEPARTMENTS OR GROUPS AFFECTED: Wastewater Treatment.
FISCAL IMPACT: The project cost to date including Change Order #19 is still 19.7%
under the total budget for the plant upgrade and expansion.
espect lly. mitt d'
City Manager
Approved:
Name. Mela~ie Harden
Title: Buyer
agenda. 442
CI-IANGE ORDER [CO]
lini~aC~on, an~ ooa~a flor doXa~, ~ende6 o~chea~, z~pple or L~aoC cost, or ~y other
~GE DP~~ WO~ TO BE P~O~
1. REF~EN~ P~ NO.
probL~ o~ ~t=in~ debris ~ caw
TOTA~ 0 Calendar Days $46,000,00
4B~-0425 D.22 PurcheIing City o~ Denton
Exhibit I
CHANGE
ORDER
[CO] Page
~lan Plununer and Associates Engineer's Estimate $11,000.000.00
Original Con=tact Amount {Gracon Construction Co.) 28,6%7,000.00
New Increase or Decreaee <> in Contract Amounts:
Previous Change Order No. 1 <$ 6,125.00>
Previous Change Order No. 2 ¢$ 9,640.97>
previous Change Order No. 3 $ 2,982.00
Previous Change Order No. 4 <$ 4,950.83>
Previous Change Order No. 5 $ 71,187.00
Previous Change Order No. 6 $ 9,980.00
Previous Change Order No. 7 $ 6,196.00
Previous Change Order No. 8 $ 3%,424.00
Previous Change Order No. 9 $102,000.00
Previous Change Order No. 10 $ 5,790.00
Previous Change Order No. 11. $ 8,194.00
Previous Change Order No. 12. $ 4,726.00
Previous Change Order No. 13. $ 4,628.00
Previous Change Order No. 14. $ %,740.00
Previous Change Order No 15 $ 9,545.00
Previous Change Order No. 16 $ 4,900.00
Previous Change Order No. 17 $ 3,490.00
Previous Change Order No. 18 $ 9,785.00
This Change Order No. 19 $ 46,000.00
Total of Change Orders $307,850.20
Revised Contract Amount $8,954,850.20
Net Change in Contract Time 0 Calendar Days
Revised Contract Completion Time 730 Calendar Days
Percent Change Orders per Original Contract Amount 3.56%
Attached: PCI~ 106
CHANGE ORDER [CO] ~ -~- o~
James L. Altstaetter, P.E.
John H. Cook, P.E.
~ ~~, !~. Alan H. Plummer, Jr. P.E.
Richard H. Smith, P.E.
ENVIRONMENTAL/CIVIL ENGINEERS
457-~20~
~ccm~r 2, 1993
Mr. Gored P. Cosgrove, P.E.
Watcr~a~ewatcr Utilities
Ct~ of ~nton
901-B Texas
~n~n, Texas 76201
Re: Pec~ C~k W~tcwamr Tma~cn~ Pl~t
Gdt S~m Ofinde~
~ar ~. Cosg~v¢:
Dung ~¢ o~ration of~ new Grit S~ctu~, ~ grit pump check v~ves ~d grit cyclones haw sever~
times ~com~ ent~gled wi~ ~gs ~d o~er stfin~ matefi~ passing ~ b~ scr~n ~d, ~ piping
eqMpment h~ to ~ ~en ap~ ~d cl~ed. ~viously ~e~ solids wo~ coHect~ at o~er l~afio~ on-
site such ~ ~ pfima~ sludge p~ps, ~ gravi~ sludge ~ckene~, ~d ~ ~ae~bic digests,
have caused m~n~n~ p~blems at ~eso locafio~.
~ ofigin~ dosi~ of~o g~t s~cm~ had ~ of~ grit was~g water ~ing disch~g~ into ~ exis~g
sower lin~ on ~e pl~t site. ~ rigs ~d o~er ~ngy matefi~ removed M ~ gdt ~ we~ ~m~
to ~ f~nt of ~ pl~t. ~ ma~fi~ ~en had to ~p~s ~ugh ~o b~ scm~ whore some of it coMd
~ ~mov~. However, ~e exis~g s~wer 1Me wo~d at times bac~p flow M~ ~ fo~m~'s o~ces due
to ~e addifionM flows from ~ gdt s~c~. ~ grit was~g water w~ ~pi~ ~ disch~go back
· ¢ ~nt of ~ ~t s~c~e. ~s h~ inadv¢~enfly ~sMt~ in ~ ~e ~gs ~d o~r sMn~ matefi~
~Mg ~nfinuously ~cycl~ ~ugh ~e ~t ~c~ro ~fil ~ ping ~d ~t cyclones ~c~e clogg~.
in ~nt of ~e grit p~ps to grind ~e rags rote SUCh sm~ pa~uu~ ........... ·
~e grinder blades wiB likely require repla~ment ev¢~ 12 mon~ or so. ~s option is less
~ i~t~ng a new ~n IMe ~m ~e ~t stmc~m to ~¢ raw sewerage 1Mos into ~o pl~t
We have m~ew~ ~o v~ous optio~ av~lable ~d our re~mmendafion ~ ~e pl~t o~fion
~d originating ~f, ~ ~oy ~ncur wi~ ~s approach. Plebe let us ~ow if you have my
or require ~y addifion~ ~o~a~on on ~s mawr.
SMcemly,
~ PLU~R ~ ASSOCIA~S, INC.
A. ~ Head, I ,
~H:mds
cc: Mr. David Hm, P.E., Co~lt~t, ~ty of ~nmn
Mr. ~ K. ~son, Ci~ of ~nton
Mr. Hewed M~n, Ci~ of ~nton
Mr. Oem M~, Resident Project Rep~n~five, M~ Plier ~d Associates,
Fro 457-~25 C.2
Fro 457-~20 C.2
210 West Sixth Street · Suite 400 · Fort Worth, Texas 76102-4803 · (817) 332-4085 · Metro (817) 429-9567 · FAX: (817) 338-4626
James L. A~tstaetter, P,E.
John H. Cook, P.E.
~ ~1[~' Peggy W. Glass, Ph.D.
Richard H. Smith, P.E.
ENV[RONMENTAL/CIVIL ENGINEERS
December 3, [993
Fir. Ron Janson
Project Manager
Gracon Construction, Inc.
P.O. Box 850756
Mesquite, Texas 75185-0756
Re: City of Denton
Pecan Creek Wastewater Treatment Plant Improvements
Job No. U102
PCM No. 106 - Grit Structure Grinder
Dear Fir. Janson:
Please price the purchasing and installation of two (2) grinders
on the suction side of the grit pumps and valves at the grit
structure consistent with the piping configuration and
electrical/instrumentation controls attached. Coordination and
work from other trades, including painting, will be required.
Please sign, date, and return the attached PC1Z form along with a
cost breakdown for this work.
Sincerely,
ALAN pLLTMMER AND ASSOCIATES, INC.
Cletus R. Martin
Resident Project Representative
CRM:sm
Attachment
cc: M_~. Dave Ham, P.E., Consultant
Mr. A. Lee ~ead III, P.E., Alan Plurmmer and Associates, Inc.
File 457-0425 D.20
File 457-0420 D.20
3CMl02.wp
210 Wea Sixth Sheet * Suite 400 · Fort Wo~h, Texas 76102-4803 · (817) ~2-4085 · Me~o (817) 4~-9~7 * FAX: (817) 3~626
DEC 02 '93 02:35RM CR~A DALLAS
Chiang, Patel and Associates, Inc.
Consulting Engineers December 2, 1993
Mr. Clete Martin, P.E.
Alan Plummer & Associates, Inc.
210 W. 6th Street, Suite 400
Fort Worth, TX 76102
RE: Pecan Creek Water Reclamation Plant
Electrical and Instrumentation requirements for Grinder Installation.
Dear Clete:
In regard to the above mention the following items should be included in the PCM for
operation of the proposed grinder system.
Grit Pump starter modifications, removal eagle timer, provide a 0-5 second time
delay relay to energize in such away that the grinder will be started, it will send a
start signal to the grit pump, after a time delay (3 second) the bn-it pump will start.
Grinder Power, shall be from MCC-GR cubicles, GR-D1R and GR-D2R spare
20A/3P breakers. Provide 2-1" conduits from MCC to south wall of enclosure
overhead, route down inside of wall, then thru wall at floor. Route conduits exposed
on concrete, then concrete encased underground to grit structure. Conduits shall
then be route exposed to grinder control panels. Each conduit shall comain
3#12,~12g. power, 2#14 to grit pump, 6#14 to termination panel for SCA. DA
system.
Grinder Pump Starter, shall be manufacturer's standard NEMA 4X panel, except
provide a Hand-Off-Auto switch, a remote start contact from the SCADA system in
the Auto position, 2 normally open run contacts, one for monitoring to the scada
system one for start/stop of the grit pump, one normally open malfunction contact
for remote monitoring to the SCADA system. Mount control panels on aluminum
switchracks.
Instrumentation modifications, provide 4 digital input points for grinders run and
malfunction status, 2 digital output points for grinder start/stop comrol from the Belt
Press Building LPU. The graphic screen shall be change to include these grinders
as well as a timer function, operator will select a amount of time to run every hour.
REGAL CENTER I, 8828 STEMMON$ FREEWAY, SUITE 4'10, DALLAS, TEXAS 75247
P. 3/3
DEL] 0~ '93 ~:36PI'1 CP~ D~LL,QS
Mr. Clete Martin, P.E.
December 2, 1993
Page 2
Please call if you should have any questions concerning this matter. Sincerely yours,
CHIANG, PATEL AND ASSOCIATES, INC,
Patrick N. Moseley, P.E.
Project Engineer
PNM/rsm
JOB NAME
~ Alan Plummer ,oB NO.
~/~l~sociates, Inc. CA~OU~T~ BY_ DATE
ENVIRONMENTAL/CIVIL ENGINEERS VERIFIED BY DATE.
45' 45'
TYP. TYP.
t5' OVERHEAD SEAL WATER
lINE TO PUMPS
TYP.
.~-COLUMN
,/
1,,
MS-201
TYP.
PROPOSED CONTRACT MODIFtCAT10N EPcv]7-7
0~1~ CiTY OF,DENTON ':
~ROJECT I=ECAN CREEK ,ww"rF IMPROVEMENTS OWNER U102
CONTRACTOR GRACON CONSTRUC'TION INC. ,., CONI'I~ACTOR 9?03
ENGINEER ,ALAN'PLUMMER AND ASSOCIATE~ INC. ENGINEER 4-57-04'25
EEi,~tDENT ~EPRESENTAT1V~ CLE'i'E M,ARTIN~ PCM NO.
~ ARE CONS~D~tNG M.&KINe '114E Ct. IANG~ 113 I~!E CONTRACT B£SCRIBrn IN THE ATTACHr'm IdAl'g~lAL~
ANO I~-~X.JEb'1' THAT '/'~U TAKE THE F'(~_.~ ~Ng A~'~ON~
[] NOTIF'Y U~ THAT YOU CI~t~ICUE THAT THIS tHAN~' DOLES NOT RECXJIEE A CHANGe: IN CDNI'~ACT
TIUE OR AMC~JNT. A ~lL~1.n DRO[?I WILL BE
,/~pERBMIT A PRIC~: PROPOSAL ~11-1 DETNLJ~ CO~T BREAKOOI~q AND RE'VI~ $CH~)ULE FOR
FORMING 'rile '11~E D~IBc'~ C~IANG~..
~ PEO~~~ ~UE ~O MA~iA~ RRO~ONS ~E C~ACT.
CON.ACTOR'S
~E OON~A~.
AC'fiON TAKEN:
[] PROPOSe3 CONIRACT ~O[~IFICA~ION REJ£CLt~. ~:ONTEACTOR NOTIFIED NOT TO PRO~.
Dy: OA1T.:
~1 ~ ORDER ISSUED: NO. DATE a~