Understanding QPE Forecasts, Dewatering, and Passive Treatment under the 2022 GCP

Presenters:
Matthew Renaud | Stormwater Regional Technical Consultant | Terracon
Melanie Sotello | Director of Environmental Services | CASC Engineering and Consulting

Date: Wednesday 12th August 2026

Time: 11:45am Pacific Daylight Time

Level: Intermediate

Duration: 1.25 hour

Type of Course: Webinar – Live

PDH credits: 1

With the California Construction General Permit (CGP) now fully implemented, significant requirements now exist regarding site dewatering, using passive treatment, and weather thresholds in stormwater monitoring. These changes present new challenges and opportunities for stormwater professionals to effectively maintain water quality and permit compliance.

This webinar will provide the essential background understanding that SWPPP Developers and Practitioners to understand and navigate these updated requirements. Attendees will learn about the requirements for dewatering and passive treatment systems and how to track the weather forecasts to identify a Qualified Precipitation Event (QPE). This timely webinar offers practical guidance to adapt stormwater management strategies in light of the new permit requirements, in pursuit of improved water quality outcomes.

• Learn how to track a storm to determine whether a QPE exists, and what actions are needed to be taken, and by when.
• Be able to identify when the Dewatering requirements of the CGP are required, or if other discharge permit(s) have jurisdiction.
• Be able to identify what the requirements are for a project to be able to utilize Passive Treatment as a means of meeting discharge NAL requirements.

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