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When to Perform Inspections When it Rains

September rain gave us a spooky reminder that the rainy season is near. Our inspectors went to all sites that hit the threshold. With this September Surprise we got many questions from our clients regarding Inspection Triggers. We wanted to help provide a resource to help clarify the requirements (see below).

Definitions

REAP - Rain Event Action Plans

SWPPP - Stormwater Pollution Prevention Plan

WPCP - Water Pollution Control Plan

Storm Event - A storm that produces, or is forecasted to produce, at least 0.1 inch of precipitation within a 24-hour period

Qualifying Rain Event - Storm that produces at least 0.5 inch of precipitation

NOAA - National Oceanic and Atmospheric Association


*Note, Rain Events are separated by 48 hours of no rain


Weather Forecast

We are required to use the NOAA Weather Forecast (www.weather.gov) for all forecasts for our projects. Go to www.weather.gov, search the nearest city to your site, scoll down and click on "Forecast Weather Table Interface". This is what we use to predict rain totals and percentages.


For more information on how to use weather tools, watch our YouTube video with TCG President, Robin Tully, PE, QSD (click here).


Caltrans Projects

Most of our Caltrans Projects are using the 2015 and 2018 Standard Specifications.


A REAP is required for Risk Level 2 and 3 sites when there is a 50% chance of any amount of rain. The REAP is supposed to be prepared at least 48 hours prior to the rain event. It is up to interpretation of each individual site if these 48 hours are counted as business hours (i.e. is the weekend excluded), or not.


A Pre-Storm Inspection is required for all Caltrans SWPPP & WPCP projects within 48 hours of a forecasted storm event (see above for definition), which is a storm that is forecasted to produce at least 0.1 inch of rain within a 24-hour period.


A During Storm Inspection is required for these sites for every day during an extended storm event when precipitation is forecasted to exceed 0.10 inch.


A Post Storm Inspection is required within 48 hours after a rain event has concluded.


We sample any time there is a discharge produced from a Risk Level 2 or 3 site at the time of inspection. After sampling, we calculate the total inch(es) produced during the storm. If the total is over 0.5 inch, the storm is considered a Qualifying Rain Event. We then put this Sampling Data into California SMARTS database.


CASQA Projects

A REAP is required for Risk Level 2 and 3 sites when there is a 50% chance of any amount of rain. The REAP is supposed to be prepared at least 24 hours prior to the rain event. It is up to interpretation on each individual site if these 24 hours are counted as business hours (i.e. is the weekend excluded), or not.


A Pre-Storm Inspection is required for all Caltrans SWPPP & WPCP projects within 48 hours of a qualifying rain event (see above for definition), which is a storm that is forecasted to produce at least 0.5 inch of rain.


A During Storm Inspection is required for these sites for every day during an extended storm event when precipitation is forecasted for any amount.


A Post Storm Inspection is required within 48 hours after a rain event has concluded.


We sample any time there is a discharge produced from a Risk Level 2 or 3 site at the time of inspection. After sampling, we calculate the total inch(es) produced during the storm. If the total is over 0.5 inch, the storm is considered a Qualifying Rain Event. We then put this Sampling Data into California SMARTS database.


Have any questions?

Contact us at (707) 693-1926, and ask to speak with a QSP or QSD. Or, contact your Stormwater Inspector for your site. Feel free to email us at estimating@tullygroup.com with questions, as well.


Looking for a Stormwater Inspector?

Call (707) 693-1926, and ask for Sierra (Estimating Assistant) or Katelyn (Lead Estimator). You can also send an email to estimating@tullygroup.com


Katelyn, Lead Estimator

Click here to download the Inspection Trigger Matrix to share with your crew!

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