esm223_14_Draft Reg Endnotes 18Sep07

esm223_14_Draft Reg Endnotes 18Sep07 - Draft Endnotes for...

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Draft Endnotes for Draft Recharge Regulations Last Updated: September 18, 2007 Page 1 of 6 Draft Endnotes for Draft Groundwater Recharge Reuse Regulations These draft endnotes accompany the draft recharge regulations currently being developed by the California Department of Public Health’s Drinking Water Program. The draft recharge regulations address the supplementation of groundwater by surface spreading or subsurface injection of treated municipal wastewater prior to eventual extraction via drinking water wells for potable use. The latest version of the draft regulations is here: http://www.cdph.ca.gov/healthinfo/environhealth/water/Pages/Waterrecycling.aspx ENDNOTE 1. §60320.030. Control of Regulated Chemicals and Physical Characteristics New Regulated Contaminants Subsection (a)(1) refers to regulated contaminants. Among contaminants that are likely to have MCLs in the future are chromium-6, and 1,2,3-trichloropropane. ENDNOTE 2. §60320.047. Additional Constituent Monitoring Analytical Methods for Unregulated Chemicals. Subsection (a) states that the GRPP shall conduct the following and report any detections. Some of the chemicals will have analytical methods that are available. Some may not. CDPH views the use of drinking water methods as most appropriate, since they are generally more sensitive than wastewater methods. However, this may not always be possible, since there may be characteristics of the wastewater (e.g., high total dissolved solids) that may make the use of drinking water methods difficult. GRRPs should select methods for non-regulated chemicals according to the following approach. 1. Use CDPH-approved drinking water methods, if available. Drinking Water Program Division of Drinking Water and Environmental Management California Department of Public Health
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Draft Endnotes for Draft Recharge Regulations Last Updated: September 18, 2007 Page 2 of 6 2. Use CDPH-recommended methods for chemicals in subsection (f) (e.g., 1,2,3-TCP). 3. If there is no CDPH-recommended drinking water method for a chemical, and more than a single EPA-approved method is available, consult with CDPH to determine to determine the appropriate EPA-approved method. 4. If there is no EPA-approved method for a chemical, and more than one method is available from the scientific literature (e.g., peer-reviewed journals), consult with CDPH to determine an appropriate method. 5. If no approved method is available for a specific chemical, the GRRP’s laboratory may develop or use its own methods and should provide the analytical methods to CDPH for review. 6. If the only method available for a chemical is for wastewater analysis (e.g., a chemical listed as a priority pollutant only), sample and analyze for that chemical in the treated wastewater immediately prior to reverse osmosis treatment to increase the likelihood of detection. Use this approach until the GRRP’s laboratory develops a method for the chemical in drinking water, or until a CDPH-approved or -recommended or EPA-approved
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This note was uploaded on 08/06/2008 for the course ESM 235 taught by Professor Dunne during the Winter '08 term at UCSB.

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esm223_14_Draft Reg Endnotes 18Sep07 - Draft Endnotes for...

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