1 / 10

Proposed Updates to DEQ-7

Proposed Updates to DEQ-7. Consolidation of corrections and submissions for 2008 and 2009. Description of changes. Re-write of introduction to expand explanation of risk factors and human health advisories as well as provide an explanation of the new magnitude/frequency/duration criteria

liluye
Download Presentation

Proposed Updates to DEQ-7

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Proposed Updates to DEQ-7 Consolidation of corrections and submissions for 2008 and 2009

  2. Description of changes • Re-write of introduction to expand explanation of risk factors and human health advisories as well as provide an explanation of the new magnitude/frequency/duration criteria • Addition of pesticides found in groundwater: 20 new compounds and three metabolites • EPA National Water Quality Criteria: Seven revisions to existing toxicology limits, five new compounds from the priority pollutant list and nine new compounds from the non priority pollutant list • Correction to existing standards for typos and incorrect synonyms: thirteen corrections • Alteration of footnotes to reflect incorporation of frequency and duration for to all standards, as well as separating comments specific to either Human Health or Aquatic Life standards. • Alteration of format ( 8.5x14 landscape to 8.5x11 portrait), and modification of cell contents to allow electronic searches of the entire database, within any field

  3. Alterations to Introduction Added a detailed explanation of the implementation of frequency and duration criteria to the standards. • Expanded the explanation of terms section to give more detailed descriptions of classifications (carcinogen, toxin, etc.) • Added a more detailed explanation of the differences between aquatic life and human health standards

  4. Pesticides • All of the following pesticides were detected by the monitoring program, as managed by the Montana Department of Agriculture. It is DEQ’s responsibility to establish interim numerical standards as authorized under 80-15-201. • DEQ has sought the support of the regional EPA Toxicologist in making determinations as to the classification of the compounds (toxic or carcinogenic) and the selection of the appropriate cancer slope indices, where appropriate.

  5. Aminopyralid Azinophos-methyl Difenoconazole Ethion Ethofumasate Fenbuconazole Imazalil Imazethapyr Mecoprop (MCPP) Proprioconazole Prosulfuron Sulfosulfuron Tebuconazole Triclopyr Dimethenamid Dimethenamid OA Flucarbazone Flucarbazone sulfonamide Imazapic Pyrasulfotole Azinophos-methyl oxon Pesticide list

  6. New criteria Chlorodibromomethane 2-methyl-4,6-Dinitrophenol Bis(2-ethylhexyl)Phthalate 2-chloronapthalene Nitrobenzene Revised numeric limits Alpha-BHC (HH) Gamma-BHC (AL) Dinitrophenol-2,4 (HH) Heptachlor (HH, AL) Methylene Chloride (HH) Methyl Bromide (HH) Bis(2-chloroisopropyl)ether (HH) Acrolein (AL) List of new compounds to be added or altered from the National Water Quality Criteria for priority pollutants

  7. Ether, Bis(chloromethyl) Nitrosamines Dinitrophenols Nitrosodibutylamine,N Nitrosodiethylamine,N Nitrosopyrrolidene Demeton (Aquatic life) Barium List of new compounds to be added from the National Water Quality Criteria for non-priority pollutants

  8. Bromate (New) Chlorite (New) Haloacetic acids (New) List of compounds attributed to the Drinking Water Standards (MCL’s)

  9. Numerical errors Alpha emitters (HH numeric error) Dichloroethene,1,1,- (HH numeric error) Dinitrotolulene,2,4- (HH numeric error) Endosulfan (HH numeric error) Radon 222 (HH numeric error) Trichlorobenzene,1,1,2- (GW numeric error) Heptachlor (AL numeric error) Improper synonyms Iron Selenium Manganese Copper Nonylphenol p,p-dichlorodiphenyl trichloroethane (DDT) Improper attribution Lead Radon 222 Alpha emitters Beta emitters Dichloroethene,1,1- Corrections to the 2008 version of DEQ-7

  10. Significant Alterations to footnotes • Footnote 3 identifies an averaging period (one hour average) and exceedance frequency (once in any three year period, on average) for acute aquatic life standards • Footnote 4 identifies the averaging period (96 hour average concentration) and adds an exceedance frequency (once in any three year period, on average) for chronic aquatic life standards • These changes would improve the consistency of Montana’s standards with EPA 304(a) criteria and fit better with how Permitting utilizes the standard to develop permits.

More Related