HomeMy WebLinkAboutC2016-503 - 10/5/2016 - NA CITY OF CORPUS CHRISTI
AMENDMENT NO. 2
CONTRACT FOR PROFESSIONAL SERVICES
The City of Corpus Christi, Texas, a Texas home-rule municipal corporation ("City") and Urban Engineering
("Consultant"), agree to the following amendment to the Contract for Professional Services for Laguna Madre
Wastewater Treatment Plant Head Works and Bar Screen Improvements (Project No. E10048):
Original Contract October 30, 2012 ( Motion No. M2012-190 $359,620
Amendment No., 1 I September 18, 2014 ! Administrative Approval _ $18,334
In the Original Contract, Exhibit"A", Section 1. Scope of Services shall be amended as set forth in the attached
Amendment No.2, Exhibit"A"
In the Original Contract,Section 3, Fees shall be amended based on the modified scope of services in the attached
Amendment No. 2, Exhibit"A"for a fee not to exceed $6,800, for a total restated fee not to exceed $384,754
All other terms and conditions of the October 30, 2012 Contract for Professional Services between the City and
Consultant,and of any amendments to that contract,which are not specifically addressed herein shall remain in full
force and effect.
Y • pi TI UR ANrNEEG( e
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cO12 erie H. Gray, P.E •ate am L. Urban, P.E. Date
Executive Director of Public Works Principal
2725 Swantner Drive
Corpus Christi, TX 78404
Phone (361) 854-3101
Fax (361) 854-6001
APPROVED AS TO LEGAL FORM
Aimee Alcorn-Reed
&J. 2016.09.27 16:53:23-05'00'
Assistant City Attorney Date
ATTES
\ ' tfru2-r-te-„ (0 [c //
City Secretary ate
Project Number E10048
Accounting Unit 4252-064
Account 550950
Activity E10048014252EXP
Account Category 50950
Fund Name WW 2013 RVBD
2016-503
10/05/16 STEWAT ER\E10048 LAGUNA MADRE WWfP IMPROVEMENTSUIRBAN ENGINEERINGIAMENDMENT NO 2\CONTRACT DOC REV 1011/15
Urban Engineering INDEXED
LI URBAN Job No. 9984.8200
e, ENGINEERING
July 20, 2016
TRANSMITTED VIA EMAIL
Mr. Jeffrey Edmonds, P.E.
Director of Engineering Services
City of Corpus Christi
P. O. Box 9277
Corpus Christi, Texas 78469
Subject Laguna Madre Headworks and Bar Screen Improvements
City Project No. E10048
Dear Jeff:
The City has requested that we pursue a change order with the Contractor for the
subject project for some additional rehabilitation work at the Laguna Madre WWTP. The
additional work items are discussed in the following:
ADDITIONAL CONSTRUCTION SCOPE
1. Aeration Basin Sluice Gate Replacement: There are two 24" sluice gates mounted in the
Aeration Basin discharge trough on the pipes that feed the two Final Clarifiers. These sluice
gates were installed in 1982 and are in need of replacement due to their age and condition.
These gates allow isolation of the Final Clarifiers. We will need to determine the following:
a. How to isolate and dewater the trough to allow access to the gates.
b. Determine best method to replace the gates, whether we can replace the gates with the
same type or cut off the wall pipe and mount the new gate to the concrete wall.
c. How to keep the Aeration Basin in service while the gates are replaced.
2. Digester Air System Replacement: The existing air piping and air system for the Aerobic
Digester was install in the 1982 and is failing due to significate corrosion. A plan view of the
Digester is attached. The air header runs along the center wall and sits right above the
water surface. It appears that the header on each side of the wall and piping up to the
header will need to be replaced from the new air header installed outside the basin installed
in approx. 2006. Scope appears to be to tie into the 2006 air header above the ground
outside of basin, run new air piping to the walkway, run a new air header along each side
along the edge of the concrete walkway, extend and reconnect the existing air drops,
reconnect to auxiliary air pipes to airlift pumps and install new handrail along the concrete
walkway on the inside of the new air headers. We will need to determine the following:
a. Can we replace the air headers while the basins are still in service or will they need to be
drained partially or completely.
b. Is there room to route the parallel air headers along the top of the concrete walkway.
c. How to tie into the existing newer air header.
d. How to extend and connect the existing air drops to the new air header. There are
vertical 1" dia. air drops at 18" on center along the air headers that will need to be
reconnected.
(361)854-3101 2725 SWANTNER DR.• CORPUS CHRISTI,TEXAS 78404 FAX(361)854-6001
www.urbaneng.com
TBPE Firm#145
TBPLS Firm#10032400 AMEND. NO. 2
EXHIBIT "A"
Page 1 of 2
Jeffrey Edmonds, P.E.
July 20, 2016
Page 2
The additional engineering services required for the additional work items included in the
change orders include initial investigation, meeting with plant staff, site visits, locating original
equipment drawings, developing scope, specifications and exhibits, reviews with City staff,
contacting the Contractor concerning the additional work, negotiating and preparing change
order, answering Contractor questions, checking progress, punch lists and checking completion.
We request that our present AE contract be amended by $6,800 to add the engineering
services to accomplish this additional work noted above. A breakdown of the proposed fee is
attached. Please review and let me know should you have any questions or comments.
Sincerely,
URBAN ENGINEERING
eMark Maroney,
MM/
Enclosure
xc: Daniel Deng, P.E. —Engineering Services via email
Kent Power, P.E. —Construction Services via email
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AMEND. NO. 2
EXHIBIT "A"
Page 2 of 2