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

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STANDARD AGREEMENT FOR PROFESSIONAL SERVICES Page 2 of 3 Between City of South Bend and ARCADIS U.S., Inc. Project Number: 03029041.0000 ...... ..................... .... ... ......... _ __ w ..-__._._.. ...... _ ......... .. ............. AMENDMENT No. 1 Schedule A-1 Scope of Amended Services and Related Matters ENGINEERING SERVICES BY ARCADIS Disinfection Pilot Testing: Arcadis will perform a disinfection pilot test to determine the effectiveness of using 10 to 15 minutes of chlorine contact time in the existing chlorine contact tanks to achieve current microorganism kill permit limits. One full scale and one small scale pilot test will be performed during typical dry weather flows, and one full scale and one small scale pilot test will be performed during typical wet weather flows. Arcadis will work closely with the City to coordinate the time and date of the pilot tests. Arcadis will develop a pilot testing protocol and review with City staff in a meeting via conference call and update the protocol to incorporate the City's input. Arcadis will provide the colorimeter, jar testing apparatus, sodium hypochlorite, sodium bisfulite, and other equipment necessary to perform the small scale pilot tests. Arcadis will summarize the results of the pilot testing in a brief memorandum. The goals of the disinfection pilot testing are: • Perform one full scale pilot test in the existing chlorine contact tanks using dry weather secondary effluent. • Perform one small scale desktop pilot test in the lab using dry weather secondary treatment effluent. • Perform one full scale pilot test in the existing chlorine contact tanks using wet weather secondary effluent. • Perform one small scale desktop pilot test in the lab using wet weather secondary treatment effluent. • Evaluate the effectiveness of less than 15 minutes of contact time in terms of (i) microorganism kill and (ii) chlorine concentration. Document the results for potential future use in discussions with IDEM. Meetings and Site Visits: Arcadis will participate in a meeting via conference call to coordinate the pilot test procedures with plant staff, as noted above. Pilot tests will be performed on site and will require two additional site visits. The full scale pilot test and the small scale pilot test during dry weather will be performed during an additional site visit. The full scale pilot test and the small scale pilot test during wet weather will be performed during an additional site visit. The pilot tests are scheduled to be performed during January or February 2019, before the 2019 disinfection season begins. Should the pilot test schedule extend beyond the anticipated date, additional visits may be necessary through a future amendment. Remaining WWTP Needs Costs. Develop costs for the remaining WWTP plant needs not already completed including Final Clarifier Nos. 1-3, aeration tank air piping replacement, and DAF replacement. Summarize needs in a table. INFORMATION PROVIDED BY CLIENT Client will provide the following information and assistance during the assignment: 1. Assistance to obtain the secondary treatment effluent sample for the small scale pilot test. 2. Coordinate dry weather and wet weather events and timing of pilot testing. 3. Isolate one chlorine contact tank for the full scale pilot tests and vary the chlorine dose. 4. Analyze E. coli samples (estimated total number of samples: 36). 5. Analyze ammonia samples (estimated total number of samples: 6). 6. Analyze TSS samples (estimated total number of samples: 6). .SB WWTP Peak. Flow Strew Testing and Optimization._ Amendment No.. I - AES