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Detergents – Black Light/Cotton Pad Indicates presence of optical brighteners, used in detergents to whiten fabrics, which fluoresce under ultraviolet light. Sources of detergents include failing septic systems, improperly connected laundry discharges and industrial sources. 1. Soak cotton pad with sample. 2. Place under black light. If it fluoresces, detergents are present. 3. Under bright light conditions, you may have to move to a dark area or devise a box to block light. 4. Record the detection or absence of detergents on the Monitoring Locations Inspection and Sampling Field Sheet. Note: If an intermittent discharge is suspected, the cotton pad can be secured at the outfall or an upstream point (such as suspended in a storm DI) for a given length of time during dry weather before black light exposure. A suet feeder cage works well. Construction Activities that Require SWPPP Appendix E (from NYS Construction General Permit (GP-0-20-001) Appendix B-Table 1 and Table 2 2