SIMPLIFIED TEXAS INDUSTRIAL STORMWATER SAMPLING TIPS

(1) PREP FOR SAMPLING:

· Review your requirements (SWPPP).

· Obtain a sampling kit from your lab.

· Keep site rainfall records (gauge or station).

(2) CHOOSE A RAIN EVENT:

· At least 0.1” of rain (more = better).

· Must be >72 hours since the last rainfall.

· Rain must fall during daylight hours.

(3) SAMPLE STORMWATER:

· Fill containers during the first 30 minutes of runoff.

· Place containers in cooler with ice.

· Complete the Chain of Custody.

· Complete a Quarterly Visual form.

(4) SAMPLES TO THE LAB:

· Phone the lab for cooler pickup.

· Or, deliver the cooler yourself.

· Make sure you meet holding times.

REMEMBER:

· This summary is intended to provide sampling reminders in a simplified manner. Check facility-specific procedures in your SWPPP and consult the full text of the Texas multi-sector general permit TXR050000 for more details.

· Work safely. Rain storms often generate dangerous lightning and sample bottles often contain strong acid preservatives. Follow your employer's safety procedures including all required documentation such as Job Hazard Analysis.

· Quarterly Visual exams are required at all outfalls but lab sampling may only be done at a limited number due to substantial similarity (see your SWPPP for details).

· Sampling strategy may have a significant impact on laboratory results. Inadequate run-off volume often leads to questionable representivity. Depending on prevailing conditions, obtaining good stormwater samples can be surprisingly difficult.