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HomeMy WebLinkAboutItem 5 PPP 04-04-18 Operations Committee - P1-105 PDSA Contingency Increase AT /f V AP , . • -fit ` �. c� ., Headworks RehabilitationandExpansion • • Project No. PI-105 .. perations �. • �o JN�� S A PI 1, Troy Committee Q ? o � PDSA Increase for Gate Assessment April 4, 2018 �Fc''ac THE Headworks Facilities atPlant 1 'LIE $241M construction no F` cost; $25M District 5-0000 15-0000 ® , costs; LAirE(JA0005 8 $11M Consultant costs MHP0005.0U' ,O ®NHP0010-0" SAR"5-0t%+ "O SAN00i0.0000 • 6+ years construction SAM0005-0r' 0 ,. �sar0'Sooa duration ar= Complex sequencing .®BKRO 05-0000 constraints p Significant resources / throughout construction Gate AssessmReduces Risk • Gates are corroded and t unreliable • Costly construction Y_= impacts if gates are not p g performing { • Schedule delays • Standby costs f • Extended overhead costs ` • Assessment confirms - z - scope of work for replacement SIN. - •.� A�. , i; __—.r-.,� �'� �� �� � ,. W,!. .ter • ��� e Isolation is Critical to Construction Access • Major shutdowns and flow diversions • Reliable gate seal to maintain facilities dewatered for confined space entry - ti�rs'ar. � • Work delay could extend costly bypass r pumping _ ($30,000/day) v. ,7>ri 711, Oust ae frtlwe�s Nb.l 1 BuMwa(7yq '-.'.rwnr o efrfo�he(0' an'o tben Key ge �� l � FLIT URF FXPANSION Gate a Replacements 'La 1 STATION require �� 1 _ , , _ _ SCREEN �� gatesIMP ROOM. are critical 4 * Major shutdowns required including complete shutdown * Confined space entry 5 Q Q Q Q �,, vi.► �r�r��r.►�r.►v preparation _ __ . - .� ►, ►:�- TUNNEL�O. .L �� m. �U� L t gym! 4 .. L_ v Problem With Not Assessing Gates • Increased risk of construction change orders • Increased operational risk of gate failure • Impact to critical path work • Several critical path items require complete isolation of work area • Some work can only be performed during dry-weather months Benefits to PerformingWork by Consultant • Contractor is required for FOR JOINT BUILD OUT, SEE SK-7 EXIST JOINT FILLER assessment1/2" DIA TYPE 316 SST (OAKUM GROUT PACK) EXPANSION ANCHOR BY FM SIKADUR 31 STAINLESS, LLS W/ 3" MIN • Confined space entry support EMBEDMENT SIKADUR COMBIFLEX SG SYSTEM COMBIFLEX CONCRETE WALL • SIKADUR 31 SIKADUR 31 In-situ repairs and maintenance 3/8" T TYPE EXIST SANCON • Assessment should be 316 SST 1" 1" i 1/4 1" COATING WHERE OCURES (TYP) 1 1/2" 3 1/2" 1 1/2- performed during design-phase 9" MIN • Expertise of consulting engineer DETAILATWALLS �K3 r_ M1001 • Develop inspection plan in conjunction with confined space entry plan • Rehabilitation detailed in final design Gate Assessment DuringDry-Weather2018 Season J Keeps Project on Schedule Gate Gate Assessment Assessment Final Design Start Completion Final Design Advertise Construction Start Completion for Bids NTP Wet Weather J� Dry Weather Dry Weather 1Wet Weather J� J 2018 2019 2020 S tilt r 9 n t 9Q a4@ l�CrHQ THE ENV\Q4P Recommended Action • Approve a contingency increase of $2 , 103, 104 ( 12% ) to the Professional Design Services Agreement with Carollo Engineers for the Headworks Rehabilitation and Expansion at Plant No . 1 , Project No. P1 - 105, for a total contingency amount of $3 ,856, 000 (22%) J`v $ANTAT/O _Al ' ? A YVM Fcr/HC THE ENV\Poa AT /f V AP , . • -fit ` �. c� ., Headworks RehabilitationandExpansion • • Project No. PI-105 .. perations �. • �o JN�� S A PI 1, Troy Committee Q ? o � PDSA Increase for Gate Assessment April 4, 2018 �Fc''ac THE