Article courtesy of Kimberly K. Fu| October 25, 2014 | The Reporter News | Shared as educational material
Dixon leaders on Tuesday are set to address a state mandate regarding new regulations slated to make drinking water safer.
The issue — Hexavalent Chromium, aka Chromium 6, and how much of it the state says should or shouldn’t be in drinking water.
Chromium 6 is a toxic form of Chromium, a naturally-occurring heavy metal that’s also an industrial chemical.
Chromium 6 has been described as highly dangerous and cancer-inducing when inhaled.
In 2011, the state established a maximum containment level (mcl) of .02 parts per billion (ppb).
As of last year, regulations had allowed for total chromium levels of 50 ppb in California.
Effective July 1, the state confirmed the mcl of 10 ppb, though a sampling of five Dixon wells revealed average readings of 18 ppb.
Earlier this summer, the Dixon City Council OK’d a Hexavalent Chromium Management Study and made it part of the Capital Improvement Program. In July, the council authorized staff to seek bids for the study.
Four proposals were received by the city’s August deadline and were closely analyzed.
“Staff evaluated each proposal based on experience and qualifications only; sealed cost proposals were not opened until after the top three firms were selected,” advised Chris Gioia, the city’s associate civil engineer, in his staff report.
The choices were whittled to two and interviews conducted by two city Engineer/Public Works staff and a member of the Solano Irrigation District.
“Kennedy/Jenks Consultants (KJ) was selected as the recommended firm based on their demonstrated experience and approach in providing the subject services,” Gioia noted. “KJ has completed related work for the city of Davis. KJ is also a member of the Water Research Foundation (WRF) and provided technical review for the WRF Impact of Water Quality on Hexavalent Chromium Removal Efficiency and Cost Project.”
Work is slated to be done on a time and materials basis, he continued, with an estimated budget of $85,738.
Funds have been budgeted in anticipation of the project.
City staff seeks the council’s approval to contract with Kennedy/Jenks. If approved, the study should be completed by late spring.
The Dixon City Council meets at 7 p.m. Tuesday in the City Council Chamber, 600 East A St.