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How to do Stormwater Sampling: A guide for construction sites - Eco-3

How to do Stormwater Sampling: A guide for construction sites - Eco-3 2025

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The document is a comprehensive guide from the Washington State Department of Ecology on stormwater monitoring for construction sites. It outlines the legal requirements for managing stormwater, including conducting site inspections and sampling stormwater discharges to prevent pollution. The guide details procedures for inspections, sampling methods, necessary equipment, and record-keeping. It emphasizes the importance of a Stormwater Pollution Prevention Plan (SWPPP) and provides benchmarks for turbidity and pH levels to ensure compliance with environmental standards.

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What are the federal requirements for stormwater runoff from construction sites?

What Construction Activities Are Regulated. A Clean Water Act permit is required for stormwater discharges from any construction activity disturbing: 1 acre or more of land, or. Less than 1 acre of land, but that is part of a common plan of development or sale that will ultimately disturb 1 or more acres of land.

What three general types of monitoring requirements does the NPDES permit contain?

The monitoring and reporting conditions section of an NPDES permit generally includes specific requirements for the following items: Monitoring locations. Monitoring frequencies. Sample collection methods.

How to do stormwater sampling?

If your stormwater is discharged via a drainage ditch or vegetated swale, take a grab sample from a consistently flowing part of the ditch / swale. If the ditch / swale is too small or shallow, a barrier device in the channel or deepen a small area so you are able to sample directly into the bottles.

What is the first step of implementing a SWPPP?

7 Steps of SWPPP Planning and Implementation Step 1: Perform a Worksite Assessment. Step 2: Develop a Site Plan. Step 3: Identify Sediment and Erosion Control BMPs. Step 4: Develop Training Procedures Proper BMPs. Step 5: Implement Good Housekeeping BMPs. Step 6: Conduct Frequent Inspections. Step 7: Stabilize the Area.

What should you do with stormwater discharge sampling data collected at your facility during a previous permit term?

A summary of all stormwater discharge sampling data collected at your facility during the previous permit term. You should summarize the data by pollutant, and indicate whether the pollutant parameter exceeded any applicable benchmark or effluent limit.

How to collect a storm water sample?

o If stormwater is being discharged through a pipe into a ditch, creek, or other receiving water, it can be readily sampled as it falls from the pipe before it reaches the receiving water, if the discharge pipe is safely accessible and not submerged. Hold the bottles with the bottle opening facing into the flow.

How to do Stormwater Sampling: A guide for construction sites - Eco-3 2025

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