![]() If you are measuring the dissolved analytes or the total recoverable analytes.Only EPA 200.8, not 200.7, is approved for Unregulated Contaminant Monitoring Rule 3 (UCMR 3) for total chromium analysis because the method offers lower detection limit for the occurrence monitoring for the program.ĮPA method 200.8 can be used for metals analysis, including total chromium, in drinking water, surface water, groundwater, and wastewater. Fill out our online feedback form.Total chromium in either drinking water or wastewater for regulatory compliance can be measured with inductively coupled plasma optical emission spectrometry (ICP-OES) using EPA method 200.7 or inductively coupled plasma mass spectrometry (ICP-MS) using EPA method 200.8. Coachella Valley Water District values feedback from all members of the community as we strive to make the best decisions for our customers. The stannous chloride treatment option is substantially less expensive and has less impact to the community and the environment than other methods. Because of this testing, CVWD is prepared to meet a future Cr-6 drinking water MCL set by the state as low as 10 ppb. This demonstration project, which ended in February 2018, successfully reduced drinking water Cr-6 levels using stannous chloride. These findings led to development of the full-scale demonstration project in the water system serving Indio Hills, Sky Valley and some areas in and around Desert Hot Springs. In May 2017, test results showed that stannous chloride successfully reduced Cr-6 levels in drinking water. This was followed by two months of laboratory testing on water from another well in Desert Hot Springs. The CVWD Board of Directors temporarily halted construction of the ion exchange facilities in October 2016 and approved launching a pilot study to evaluate the feasibility and effectiveness of stannous chloride at a CVWD well in Palm Desert. It is also an approved drinking water additive used to protect water pipes from corrosion. Stannous chloride is made from tin and has been used as an antioxidant in toothpaste and food products for many years. Just as construction was set to begin, testing revealed success in an alternative treatment process using stannous chloride. The project would have cost over $250 million and caused an increase in water rates. Some communities expressed concern that the treatment facilities would be too noticeable by neighbors and require too much traffic to maintain. It would have required construction of buildings at 29 well sites and a central facility for regenerating resin used in the treatment process, as well as pipelines to service the system. In 2016, CVWD was moving ahead with a plan to build a conventional ion exchange treatment system to meet the 2014 Cr-6 MCL. The State Water Resources Control Board is now working on establishing a new Cr-6 MCL for drinking water, which could take several years. In May 2017, a judge invalidated the MCL because the state failed to properly consider the economic feasibly of compliance. That MCL of 10 (ppb has since been abandoned, along with a 2020 compliance deadline, after the state lost a lawsuit challenging the standard. This legislation triggered work by CVWD to find the best treatment method, even before state health officials enacted the country’s first Cr-6 drinking water standard or MCL in 2014. California’s Senate Bill 351 adopted in 2001 required the state to develop a drinking water standard for Cr-6. ![]()
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