Industrial Stormwater General Permit Sampling Results

1
Industrial Stormwater General Permit Sampling
Results
Bill Moore P.E. Washington State Department of
Ecology
2
Industrial Stormwater General Permit Sampling
Results

• Purpose of Sampling
• Who Sampled
• Sample Results
• Next Steps

3
Purpose of Sampling

• Tangible Evidence of Performance
• BMP effectiveness/ Adaptive Management
• Target Ecologys Inspection Resources
• Permit Re-issuance

4
Who Sampled?
5
Who Sampled?
6
Sample Results

• Considerations Caveats
• Sample results are preliminary/unofficial
• High apparent error rate with Zinc results
• Learning curve - how, when, where to sample
• Results are for samples collected April, May,
  June 2003 relatively dry quarter
• Results are for Turbidity, Oil and Grease, pH,
  and Zinc only

7
Sample Results
Turbidity Benchmark 25 NTU
8
Sample Results
Oil Grease Benchmark 15 mg/L
9
Sample Results
pH Benchmark Range 6.0 to 9.0
10
Sample Results
Zinc Benchmark 117 µg/L
11
Sample Results - Zinc

• Benchmark 117 µG/L
• Sample Results Range 0.1 to 66,000 µG/L
• Out of 394 reported values, 266 (68) were above
  the benchmark
• 20 (5) permittees reported results greater than
  2000 µG/L

12
Next Steps - Ecology

• Notify permittees who did not submit monitoring
  results
• Continue to review Discharge Monitoring Reports
• QA monitoring results received, and incorporate
  into Ecologys data management system
• Incorporate monitoring results into Ecologys
  inspection/technical assistance efforts

13
Next Steps - Permittees

• If you did not submit a discharge monitoring
  report last quarter
• If you did submit a monitoring report but were
  unable to collect a sample

14
Next Steps - Permittees

• If submitted a sample result but were above the
  benchmark values
• Review SWPPP
• Evaluate possible sources, source control and
  elimination
• Additional metals sampling (copper, lead and
  hardness) if exceed zinc benchmark for two
  consecutive quarters