HomeMy WebLinkAboutContract 42205-CO4 DISTRIBUTION:
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CITY SECWMY
CANARY-CONSTRUCTION FILE CITYOFI FORT WORTH
RINK-P'Roj'Ecr MANAGER COWRACT NO,
oe
GOLDENROD-CONTRACTOR CHANGE ORDIER REQUEST
CHANGE ORDER NO,4 DATE: 3/14/2013 DO-E.NO PRoi-Ec,"r NO, WM-20 10-200051
PROJECT DESCRIPTION, Riverside Wastewater Treatment Plan Digester SludgeTreatment,Renioval,and Disposal Project CITY SEC �TARY CONTRAC'T N .
42205
ORIGINAL CONTRACT ANIOLN. 1....... ...... $ 525,.a
4),00;
E XTRA S TO D ATE-- $0,00
CRI-MITS TO DATE— $ $46850
$
5 54u5 0
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AMO,UN'TOFPROPOSE, '[,,IANCjEOR,DE,R, ..,,,,,.,, ,,.., ......... 1 2)93�01,;5
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R-EVISED CONTRACT AMOUNT ................ 0
....... 3 T�L5
ORIGINAL FUNDS AVAII-ABLE FOR CHANGE 01WERS-----.—.,.AtW 468,
a n. lwel-- -1-1-01.1-1-1— - 1 50
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ADDrn0NAL FUNDFNG(IF NECESSARY).--.1—, 3
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REMAIN N; G FUNDS AVAILABLE FOR CHANGE ORDER....
0,00
M ACCORDANCE WITH THIS CHANGE ORDFAI,I'FIE'CONTRACTOR SHALL
The Digester Sludge Treatment, Removal, and Disposal PrQject is in progress at the Former Riverside Wastewater "Freatment Plant. The presence of
unforeseen cotiditions resulted in the Contractor treating a larger quantity of water in the oInsite treatment system,, removing and providing additional
stabilization for the sludge containing PCBs froni the Digesters, and plugging phant piping to, prevent water infiltration froIm other plant structures.
(Attachment A),
To
date the Cit,y`s overall objectives-for the Digester SlUdge"J"reatnient, Removal,and Disposal Project are bleing met by the Contractor.
The Contractor shall compilet,e all portions of the contract work as approved the original contract documents,and Cha,nge Ord,ersNo. 1,No.2,and,N .I
The schedule of completion is revised per this change order. Contract quantities and unit costs are revised per this change order as shown it) Table 1.
Documentation of the new line items/add itional quantities,incurred directly by the,Contractor are provided in,Attachment B.
,M/WBE participation goal for the proj,e remains unchanged at 14-00%.
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TOTAL,cos'r FOR CHANGE ORDER NUMBER 4, $ 1,2913,33175
/GNAII.
13 It is understood and agreed that the acceptance of this "hangs Order by the contractor constitutes arr accord and ctit,')n
and represcats payment i (both in tarts and money)for all costs arising out of,oi inctdcrital to,the Chang Q Or(l(>r
E rt
ORIG W AL CONTRA CT11ME, ADDITIONAL APPROVED TIME'rO DATE APPROVED CONTR.ACT TIME 1'0 DA'rF ADDITIONAL TINI E F 111S CHANGE ORDER
180 days 279 days 459,days 1611 days
CONTRA('7T DATF1 I FIELD ENGINEER DATE
P -0117 1
0 laq r L Contracto c Tony Boseck ,P Freese and,Nichol,s,Inc.
Mario
10I
SE DIRECTOWMANAGING DEPT DATE
100001
Richard S.Tal,e''
DIRECTOKICON"MACTI[NO DEPT, DA" CIT)"A11ORNEY DATE
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"arbe, L
s"sE'
Fal,Q
410,
Frank 0-umb,P.E.,Water Director 13 Christa Reyn(')Ids,Sen sistant City,Attorney
o
DATE COUNCIL ACTION(IF RFqUIRED) DATE
C"MANAUR
Colo,06.
W jWIII� X APPROVE'D Ui DI&APPROVED U OTHER- 7-4f-2e,1331
Femando Cost Assistant City Manager
RECEIVED JUL 112013
M&C Review Page I of 2
official silte of the City of Fort Worth,Texas,
FoTWoRm
CIV10%irg I LI AGENDA
COUNCIL ACTION.* Approved on 7/9/2013
DATE: 7'/9/2013 REFERENCE NO.: C-26331 LOG NAME: 60RIVERSIDE WWT'P
C04
CODES' C TYPE.- NON- PUBLIC NO
CONSENT HEARING:
SUBJECT: Authorize Execution, of Change Order No. 4 to City Secretary Contract No,. 42205 with AUI
Contractors, LLC, in the Amount of$11,293,332.75, Thereby Increasing the Contract
Amount to $16,548,372,.75 for Digester Sludge Removal, Treatment and Disposal at Former
Riverside Wastewater Treatment Pl,ant in, Gateway Park (COUNCIL DISTRICT 4)
9M TINSY1101101930111i I I WfIff0j) � I MAN W41MR111 1111"M
REC,OMMENDATIO N*-
It is recommended that the City Council authorize execution of Change Order No. 4 to City Secretary
Contract No. 422,105 with AUI Contractors, LLCM, in the amount of$1,293,332.75, thereby increasing
the contract amount to $6,,54.8,,372.75 for digester s,ludge remova,l, treatment and disposal at the
former Riverside Wastewater Treatment Plant in Gateway Park.
DISCUSSION.-
On October,2, 20117 (M&C C-25090) the City Council authorized a contract with AUI Contractors,
LLC7 in the amount of$5,255,04,0.00 for the removal of sewage sludge containing PCBs and heavy
metals from eight digester's located at the former Riverside Wastewater Treatment, Plant (Sector 1) in
Gateway Park.
The contract was subsequently revised by three previous change orders at no cost. On December 8,
20111, Change Order No. 1 was executed administratively to implement the use of belt press
technology for the purpose of removing, water from the sludge and additional time to the
schedule. On May 23, 2012 and August 20, 2012, Change Orders No., 2 and No. 3 were executed
administratively for additional time due to thou unforeseen conditions encountered in the field.
The work to be performed as part of Change Order No. 4 consists of removing and decontaminating
excessive water found in seven of the eig,ht digesters. When the Contractor began removing
aqueous sludge, additional water unexpectedly entered the above-ground digesters from
underground piping that connected digesters with each other and other relic structures in the
plant. Additional water was also encountered in all five below-ground digesters from flap valves in
the bottom of each digester that still functioned after 30 years of non-use, which allowed for the
infiltration, of groundwater.
The aqueous sludge treatment,and d,isposiall at the,former Riverside Wastewater Treatment Plant is
regulated by the U.S. Environmental Protection Agency's (EPA) 'Toxic Substance Control Act (TSCA)
due to elevated concentrations of pollychlorinated biphenyl�s, (PCBs). TSCA regulations re,qu,ire that
PCB-contaminated water be treated prior to discharge to the sanitary sewe�r. Contaminated liquid's
from the digesters and piping are being processed through an onsite treatment process that has been
constructed to specifically meet both TSCA and the City's regulatory requirements for disposal into
the sanitary sewer system.,
In order to account for the excessive water encountered, from system piping and prevent further water
infiltration in the ab�ove-ground digesters, the Contractor was instructed to plug pipes in the digester
pump house and'within the plant to minimize additional water from entering the above-ground
digesters. The Contractor provided a direct cost estimate for the additional services for plugging and
abandoning of system piping. Once the system piping was piluggeld, aqueous and solid sludge
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M&C Review Page 2 of 2
removal continued as outlined in the original contract docu I ts,.
Due to the increased molisturie content in the solid sludge from water infiltration, additional
stabilization measures including the addition of fly ash, cement slag powder and sawdust, was
requ,ired by the disposal facility before the Contractor was approved to, transport stabilized sludge to
the landfill. The landfill o rat,ors were not able to operate machlinery in the disposal cell out
additional stabilization measurer.
The new effect of the proposed change orders as follows.-
Original Contract Cost 51125511040.00
Change Orders Nos. 1-3 0.00
JProposed Change I'll Order No=. 4 [L1 1293,332.75
'Revised T 11 ot'al Cost 1[$6,548,372.175
The project construction manager, Freese and Nichols, Inc., has reviewed the proposed, change
order and recommends approval. Freese and Nichols Inc. provides, on-site, management during the
cleanup activities necessary to remove the sludge from the digesters and conduct folilow up
laboratory sampling and reporting activities to meet the regulatory requirements.
This project is in COUNCIL DISTRICT 4.
FISCAL INFORM ATIONXERTIF1 CATION
The Financial Management Services Director certifies that funds are available in the current oplera,ting
budget, as appropriated, of the Water and Sewer Fund.
TO Fund/Acciountrenters FROM Fund/Accounit/Camel rs
PE 45 2,45100 000000 $1293L332.75
.......... '___................ ............
Subm"Ifted for Cift, Manaqer"s Offic Fernando Costa (6122)
Originatiqq Qe ent Head,: S. Frank Crumb (8207)
Additional Information Contact: Richard Talley (8203)
.................... .......... ............
ATTACHMENTS
§Q.RIVERSIDE WWTP C014 MA
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'055 International Plan,cite 200, Fort Worth, Texas 761091 317-735-73,00 fl-lx 317-735-71491
March 14, 2013
Mr, Richard Talley
Regulatory/'Environmental Coordinator
City of Fort Worth Water Department
P. 0. Box 870
Fort Worth,Texas 76101-0870
P City of Fort Worth
Riverside Wastewater Treatment Plan Digester Sludge Treatment, Removal, and Dispoisal Project
City Secretary Project No. 42205
FNI Project No. FTW1123
Change Order Request No. C -
Dear Mir. Talley'.-
Enclosed please fire a copy of Change order No.4 for work to be performed by A l Contractors) Inc.on the
above referenced project.
This change order increases the overall contract value by$1,29 , 0 .25 to$,6,548,841.25. The purpose of
this change order is to amend the contract quantities for liquid treatment and sludge disposal, include
com1pensation for pl'u gin plant piping to tl e control rooms and pump house,and extend tl e contract time
for the project by 161 calendar days due to additional liquid treatment processing from groundwater
infiltration through the flap valves can the below ground digesters and foir City approval of the final change
order.
Sincerely,
w
Robert W. Chambers, P..G..
Principal
Enclosure
M File
(:'TW�� '3f"CM: rs,02171\ pD t \L 4°,Mi r #°Windo s\rem r s Internet Ffle \Corit, ri Outlook'!TVQ, V5RB\Charge order o 4'Submittal
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116030 Riverside WWTP
AUI Contractors,
City of Fort Worth
Freese&Nichols,
LDs $630.00 per working day
Summary of Contract Amount and Dates
Dates Days Contract Amount %Change Activity
9/19/2011 $51,255,04,0 $5,25 ,040 Commencement
1801 Original Contract Days
31/17/2012 Original,Completion Date
3,0 -$763 $5,254,278 -0.01% C/o#1 11/21/2011
4/16/201,2 Revised Completion Date,
124 $294 $15,254s571 -0.011% C/O#2 5/10/2012
8/18/2012 Revised Completion Date
125 $0 $5,254t571 -0.01%, C/O,#3 8/3/2012
12/21/2012 Revised Completion Date
161, $1,293, 1 $60548,372 24-61% C/O#4 31/1,4/2013
5/31/'2013 Revised Completion Date
,Attachment A
Detailed Description of' Change Order No., 4
............. -............... .....
Detailed Description of Change Order N'o. 4
On, October 2, 2011, the City Council authorized a contract with the AUI Contractors, LLC in the amount of
$5,255,040.00 for the removal of sewage sludge containing PCBs and heavy metals from eight digesters located at
the former Riverside Wastewater Treatment Plant(Sector 1) in Gateway Park.
The contract was subsequently revised by three previous change orders.
0 On November 21, 2011, Change Order No. I was administratively executed to implement the use of belt
press technology for the purpose of removing water from the sludge and additional time to the schedule at
a credit of$762.00.
• On May 10,, 2012, Change Order No. 2 was issued for additional quantities of aqueous sludge treatment and
time due to the unforeseen conditions encountered in the field at a, cost of$293.50.
• On August 3, 2012, Change Order No. 3 was issued for additional time for treatment of increased quantities
of aqueous sludge from the digesters at no cost.
The work to be performed as part of Change Order No. 4 consists of removing and treating excessive water fouind in
the digesters. Contaminated liquids from, the digesters and piping are required to be processed through a treatment
process to meet regulatory requirements for disposal into the sanitary sewer system,. The primary causes for the
increase in the amount of water treated by the Contractor include.:
Valves that were stuck in the open position on the above ground digesters that allowed water from
upstream, plant structures to drain to the digesters via the digester control rooms and pump house.
Presence of mud valves in the bottom of the below-ground digesters that allowed infiltration of
groundwater.,
to order to account for the excessive water encountered from mud! valves in the below-ground digesters, the
Contractor was instructed to stop pumping water from all below-ground digesters and at the Engineer's guidance,
stabilized and disposed of all solid-phase sludge from below-ground Digester No. 1, which was determined to have
the lowest quantity of sludge present. Once Digester No,. I was emptied, the Contractor was instructed to pump all
aqueous-phase liquids rapidly from, the remaining below-ground digesters using Digester No. 1 as a storage basin.
Contaminated liquids in Digester No. I were then pumped and treated in the onisit,e treatment system as outlined in
the original contract documents. This method allowed all of the bellow-ground, digesters to be de-watered rapidly to
prevent slow infiltration of groundwater from the mud valves.
Due to the increased moisture content in the solid sludge from water infiltration, additional stabilization measures,
including the addition, of cement slag, and sawdust, was required by the disposal facility before the Contractor was
approved to transport stabilized sludge to the landfill for disposal. A combination of fly ash and sawdust was used for
most of the digesters to solidify the stabilized sludge;. During the Digester No. 9 Pilot Test water infiltration did not
occur and stabilized sludge did not require the addition of sawdust for the landfill to accept the waste. The landfill
operators were not able to operate machinery in the disposal cell without additional stabilization measures.
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