16516 El Camino Real #101, Houston, TX 77062
SIMPLIFIED TEXAS INDUSTRIAL STORMWATER SAMPLING TIPS
Need help?
281-300-2174, or alison@envirosteele.com
(1) PREP FOR SAMPLING:
- Review which tests your facility needs (in your ISWPPP).
- Obtain a sampling kit from your lab.
- Make ready your PPE.
- Keep site rainfall records (gauge or station).
(2) CHOOSE A RAIN EVENT:
- Watch the forecast and local radar.
- The rainfall event chosen for sampling must occur more than 72 hours since the last measurable rainfall.
- The measurable storm event must result in an actual discharge from the site (more = often better run-off).
(3) SAMPLE STORMWATER:
- Fill containers during the first 30 minutes of runoff (not rainfall).
- Label containers and place in cooler with ice.
- Complete the lab 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 stay within holding times.
(5) IF DOING QUARTERLY VISUAL SAMPLING ONLY (NO LAB):
- Choose a qualifying rainfall event (measurable discharge) during normal hours of business operation.
- Samples must be collected in a clean, clear, glass or plastic container and examined in a well-lit area.
- Fill out a Quarterly Visual Sampling form (see your ISWPPP).
REMEMBER:
- This summary provides simplified quick reminders for phone reading in the field. Check facility-specific procedures in your ISWPPP 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.
- 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.
- 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).