Stormwater Management Standards Manual - Toledo Metropolitan ...

organic or sewage-like odor may indicate a sanitary sewer leak or connection. If the suds have a
fragrant odor, they may indicate the presence of laundry water or similar wash waters.
Physical indicators also yield important information during dry weather field screens. Physical indicators
include outfall damage, outfall deposits or stains, abnormal vegetation growth, poor pool quality, and
benthic growth on pipe surfaces. Many of theses physical conditions can indicate that an intermittent or
transitory discharge has occurred in the past, even if the pipe is not currently flowing.
6.4.3 Tracing Procedures
The investigation begins at the outfall. Once an illicit discharge is detected the investigation should
narrow the source of the discharge to a single segment of a storm sewer. When the segment of the
storm sewer is isolated an on-site investigation can be performed to find the specific source of the
discharge. On-site investigations are typically performed by dye testing the plumbing systems of
household and buildings. Where septic systems are prevalent, inspections of tanks and drain fields
may be needed. If necessary a crew can move progressively up the trunk from the outfall and test
manholes along the way. Moving up the trunk can begin immediately when an illicit discharge is
detected at an outfall, and only a map of the storm drain system is required.
6.5 Public Information
Targeted distribution of educational materials to specific business sectors in priority areas is the
most common method of promoting pollution prevention. Outreach material are designed to educate
owners and employees about polluting behaviors, recommended appropriate pollution prevention
practices, and notify them of any local or state regulations. Passive business outreach works best
when it is specially adopted and targeted to a specific business sector, and is routinely and directly
presented to local business groups and trade associations.
Third Edition Stormwater Standards Manual September 2008 Page 113