Washington CSWGP discharge sampling checklist
Weekly turbidity or transparency sampling, and pH sampling where required, with the benchmark checks and follow-up the permit sets.
Based on: Washington Ecology Construction Stormwater General Permit, monitoring and reporting requirements
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Sampling
| Item | Pass | Fail | N/A |
|---|---|---|---|
| Each discharge point named in the SWPPP sampled while discharging Photo | |||
| Turbidity (NTU) or transparency (cm) recorded with the time and location | |||
| Result compared to the benchmark (25 NTU or 33 cm transparency) | |||
| At 250 NTU or more (6 cm or less transparency): Ecology called within 24 hours and sampling repeated daily until back to 25 NTU or less, or discharge stops |
pH
| Item | Pass | Fail | N/A |
|---|---|---|---|
| pH sampled where the permit requires it (significant concrete work or engineered soils) | |||
| pH between 6.5 and 8.5, or the discharge treated before it leaves the site |
Follow-up
| Item | Pass | Fail | N/A |
|---|---|---|---|
| Over a benchmark: SWPPP reviewed and more BMPs put in within the permit's deadline | |||
| Results go on the monthly Discharge Monitoring Report | |||
| Sampler's CESCL certification current |
Photo A photo is expected with this item.
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This checklist is a starting point. Check each item against your current permit and your agency's standards before relying on it. Based on the Ecology Construction Stormwater General Permit and the Stormwater Management Manuals for Western and Eastern Washington. Sites of 1 acre or more sample turbidity and, with significant concrete work, pH. Check each template against the current permit and your local requirements before relying on it.
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