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1 RiversideCA.gov
1 RiversideCA.gov
SECOND AMENDMENT TO
PROFESSIONAL CONSULTANT
SERVICES AGREEMENT FOR GRANULAR
ACTIVATED CARBON SERVICES
City Council
December 6, 2022
Public Utilities Department
RiversideCA.gov
2 1. On October 28, 2019, RPU’s Board approved Work Order No. 2008392 in the total amount of $850,000 to address emerging contaminants per- and polyfluoroalkyl substances(PFAS). Part of the approved amount was assigned to test Bituminous Coal Based Granular Activated Carbon (GAC) for reduction of PFAS.
2. On January 11, 2021 the Board awarded two contracts to Calgon Carbon Corp. and Carbon Activated Corp. to test their
Bituminous Coal Based GAC products.
3. On April 11, 2022 the Board authorized the extension of the agreements through December 2022, to allow more time to evaluate the GAC performance.
BACKGROUND
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3 1. Each vendor filled two vessels at Palmyrita Water
Treatment Facility with virgin Bituminous Coal based
GAC.
2. Each vendor also filled one vessel with custom
reactivated Bituminous GAC.
3. RPU also retained the original Coconut Shell based
GAC vendor throughout the duration of this project.
DISCUSSION
RiversideCA.gov
4 1. Palmyrita Water Treatment Facil ity (WTF) is permitted by the State water Resources Control Board – Division of Drinking Water for dibromochloropropane (DBCP) t reatment from Electric, Moore Griffith, Palmyrita and Twin Springs wells.
2. The source water for these wells contains the following chemicals; DBCP, 1,2,3-Trichloropropane (1,2 ,3-TCP), perfluoroctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA), perfluorobutane sulfonic acid (PFBS), perfluoro hexane sulfonic acid (PFHxS), perfluorohexanoic acid (PFHxA), and perfluoroheptanoic acid (PFHpA). These are detected over th e current analytical detection level for reporting (DLR) of our contract laboratory, note State DLRs can differ from laboratory DLRs.
3. Plamyrita WTF has 15 GAC vessels. Each vessel requires 20,000 pounds of GAC per change out.
DISCUSSION
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5 1. GAC is steam activated and meets specifications for iodine numbers, abrasion numbers, moisture %, and
mesh size.
2. Virgin GAC is reactivated by placing spent GAC into a rotary furnace at 1450 degrees F. This process removes
any contaminants that have adsorbed to the GAC.
3. The reactivated GAC is rescreened to ensure it is the proper mesh size. 20% of virgin GAC is added to the
reactivated GAC to make up the amount of GAC lost
during processing.
DISCUSSION
RiversideCA.gov
6 PALMYRITA WATER TREATMENT FACILITY
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7 Days AF Days AF Days AF Days AF Days AF Days AF Days AF Days AF Filtrasorb 400 (F400) 292 23 240 20 269 22 253 20 253 20 253 20 234 19 293 20 COL-L 60 (12x40) 393 31 280 24 351 28 280 24 280 24 280 24 280 24 329 24 PSC1240 (Coconut) 256 22 238 20 194 18 194 18 194 18 194 18 295 18 204 18 PFHxA PFHpAGAC DBCP 1,2,3-TCP PFOS PFOA PFBS PFHxS
DISCUSSION
RiversideCA.gov
8 Strategic Priority 2 - Community Well-Being
Goal 2.3 - Strengthen neighborhood identities and improve community health and the physical environment through amenities and programs that foster an increased sense of community and enhanced feelings of pride and belonging citywide Strategic Priority 4 - Environmental Stewardship
Goal 4.2 - Sustainably manage local water resources to maximize reliability and advance water reuse to ensure safe, reliable and affordable water to our community Cross-Cutting Threads
STRATEGIC PLAN ALIGNMENT
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9 That the City Council:
1. Award the Second Amendment to the Professional Consultant Services Agreement for Granular Activated Carbon Services with Carbon Activated Corporation of Compton, California, for a three-year term through December 31, 2025, in an amount not to exceed $2,652,000; and
2. Authorize the City Manager, or designee, to execute the Second Amendment to the Professional Consultant Services Agreement, including making minor and non-substantive changes and to sign all documents and instruments necessary to complete the transactions.
RECOMMENDATIONS
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