Amendment No 1 to PSA - Arcadis US Inc - WWTP Stress Testing

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INTER -OFFICE MEMORANDUM DEPARTMENT OF PUBLIC WORKS DIVISION OF UTILITIES TO: Members of the Board of Public Works Eric Horvath, Director of Public Works Clara McDaniels, Board of Public Works Attorney FROM: Al Greek, Director of Utilities Jacob M. Klosinski, Assistant City Engineer SUBJECT: Agenda Request Form — Amendment to Professional Services Agreement 117-133 Wastewater Treatment Plant Stress Testing Evaluation DATE: December 3, 2018 oxr�xm�r�iu i�du��wuuuemmdmuuuereri�uxuwwiw!uww�am¢�rwmmimo�Hmre��moaae�rv�w�xraam�rvan�uwunm��rawwvraivmumrre,,nwnoodididowmuwdw�ua�oirrsu�u�unuummaaiu�rmrm�mr�manrww:wwi� omwrnrwm� u�mmroruum�um�ww�mua�uamrdrrawtiMrv�¢�wei�rururiGwr�r�r u The Division of Utilities is requesting the Board of Public Works approval of a Amendment No. 1 to a Professional Services Agreement with Arcadis U.S. for the Wastewater Treatment Plant Stress Testing Evaluation additional services. Background and Purpose The Wastewater Treatment Plant Secondary Treatment Improvements project is nearly complete. Once the project is complete, Public Works seeks to Stress Test the WWTP to better assess the hydraulic capacities and process improvements of the project. This Stress Test aligns with recommendations made during the Long Term Control Plan Re -Evaluation. The City will engage Arcadis U.S. to review the hydraulic improvements in comparison to the 2013 Facilities Plan to assist the City in determining both interim and long term planning for future flow conditions at the WWTP as required by the Consent Decree. This Stress Testing effort will focus on current conditions (48 MGD permitted, 77 MGD Peak), potential peak capacity (greater than 77 MGD) pending required disinfection upgrades, and 100 MGD through Secondary Treatment (future flow condition, Consent Decree). The review the WWTP hydraulics and biological processes after the recent upgrades is an important step in the understanding the impact of the improvements as it relates to the City's ability to more effectively treat wastewater. The improvements have already provided positive results with process improvements and the reduction of electrical costs. This evaluation will help the City develop its next phase in Capital Planning to meet Long Term Control Plan and Consent Decree goals. Amendment No.1 Arcadis will provide pilot testing (laboratory and full scale) of the Wastewater Treatment Plant Disinfection Facilities to determine the impact of reduced chlorine contact time and its effectiveness for killing microorganisms. Procedures and scope are defined in the attached Amendment No. 1. Arcadis will also provide cost estimation for select Facilities Plan projects necessary for hydraulic and process improvements as they relate to the Long Term Control Plan WWTP Upgrades. The funding sources for this study have been appropriated in the 2017 Wastewater Engineering Account (641-0630-793-31-02). If there are questions regarding the subject project, please contact Al Greek (Ext. 4210) or Jacob M. Klosinski (Ext. 9496) at the Division of Utilities.