"•On July 27, 2011, the Office of Environmental Health Hazard Assessment (OEHHA) established a public health goal (PHG) for chromium-6 (hexavalent chromium) of 0.02 micrograms per liter (µg/L). The PHG will contribute to CDPH's development of a primary drinking water standard (maximum contaminant level, MCL) that is specific for chromium-6.
"). Based on past experience, CDPH estimates the MCL development process will take approximately 18-24 months and is working to have an MCL developed and available for public comment by July 2013. The rulemaking process may then take an additional 12-24 months. Assuming the process moves along without any major delays, an enforceable MCL would be established between July of 2014 and July 2015. "
Now check out what the MWD had to say about Chromium-6 in it's very detailed and extensive comment letter in March of this year:
Chromium 6 levels are 14-16 μg/L, well above the Office of
Environmental Health Hazard Assessment (OEHHA) Public Health
Goal (PHG) of 0.02 μg/L. The Project water quality would not be
acceptable for pumping directly into the CRA without treatment. The
Final EIR must identify and analyze the environmental impacts of
constructing and operating the treatment facilities required to
introduce the Project water into the CRA.
4.9-55 The water quality analysis in part relies on faulty reasoning. The
Draft EIR assumes that “all of the water would be further treated at
the water purveyor’s treatment facilities,” however, deliveries are
made from the CRA to other groundwater basins without treatment
(e.g., Metropolitan delivers Colorado River water to Coachella
Valley Water District by releasing water for storage in groundwater
basins in the Coachella Valley).
Considering the fact that levels of chromium 6 are listed by MWD as non-detectable in their CRA supply per their latest report - there really is no alternative to Brackpool and Slater to treat the Cadiz water project so as to reduce the chromium 6 levels to what they currently carry in the CRA.