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Navajo Nation Environmental Protection Agency

Eric Rich Senior Hydrologist Navajo Nation EPA Water Quality/NPDES Program Tuba City Office 928-283-3080. Navajo Nation Environmental Protection Agency. Water Quality Standards and Water Quality Sampling. Navajo Nation Surface Water Quality Standards.

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Navajo Nation Environmental Protection Agency

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  1. Eric Rich Senior HydrologistNavajo Nation EPA Water Quality/NPDES ProgramTuba City Office928-283-3080

  2. Navajo Nation Environmental Protection Agency Water Quality Standards and Water Quality Sampling

  3. Navajo Nation Surface Water Quality Standards • USEPA program delegation received in January • Antidegradation • Narrative Standards • Designated Uses (Dom, FC, HC, AgWS, AqHbt, L&W) • Numeric Standards • Biological Standards (Reserved)

  4. Navajo Nation Surface Water Quality Standards • Provides basis for 401 Certifications and NPDES Permits • Provides numeric criteria to determine designated use support

  5. Sample Design • Parameters • Sampling Method • Sampling Frequency (Minimum Data) • QA/QC - Sampling and Representative Data

  6. Parameters • Numeric Criteria (VOC’s, semi-VOC’s, nutrients, physical, radiological, metals, bacteriological) • Transition from large analytical suites to site specific suites • Revise suites based on frequency & sources • Analytical limitations

  7. Sampling Method • Lowest standard drives sampling approach • Clean hands/dirty hands required for low level mercury grab • USGS National Field Manual • Known source (stream) - grab • Unknown source (stream) - EWI or grab

  8. Sampling Frequency • Flow weighted (base flow to flood flow and back) • Seasonal considerations (agricultural or tourist season effluent) • Statistical requirements (USEPA CALM) • Adopt from other states

  9. QA/QC - Sampling and Representative Data • Cation/anion samples? • Duplicates, equipment blanks • Reliability checks - anion cation ratios • Laboratory results - holding times, chemical stability, pH/alkalinity agreement

  10. Thank You

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