1. After-Hour Stormwater Surveillance Pilot Study
Rinta Perkins (City of Walnut Creek)
Jeff Roubal (City of Concord)
October 9, 2008

2. Agenda Pilot Study Goals
Inspection Description (FY 2003/04, FY 2006/07 and FY 2007/08)
Findings
City of Walnut Creek
City of Concord
Lessons Learned

3. Pilot Study Goals Partner with Central Contra Costa Sanitary District
Confirm if and what type of non-stormwater discharge activities exist
after-hour
Identify types of illicit discharges and targeted audience
Follow-up outreach efforts
Determine if independent contractors or employees cause discharges

4. Description First surveillance in FY 2003/04 (Walnut Creek)
Cost: $4,975
2 days in November 2003 and 2 days in May 2004 (3:00 – 7:30 am)
Few activities encountered because of time of inspections
Safety concerns for inspectors
Require 2 inspectors
Police on-call

5. Description (Continued)
Joint surveillance in FY 2006/07 and FY 2007/08 by cities of Concord and Walnut Creek
Inspections occurred on June (4 days), July (2 day) and August (2 days)
Period: varied
Friday (3:30 until 7:30 am)
Saturday (5:00 until 9:30 am)
Sunday (6:30 until 11:00 am)
Cost: $10,400 (split between Concord and Walnut Creek)

6. Description (Continued)
Required only 1 inspector per city
Police Department notified
Inspectors provided:
After-hours contact list
Map of targeted areas or businesses
Written instructions
Blank surveillance logs

8. Documentation
Separate log sheet for each target area (Concord had seven areas)
Recorded any observation whether there is an event or not
Provides a source document for follow-up
Documents for regulators that we have not ignored after-hours activity

10. Findings More washing activities during the time period
Surveillance provides leads to follow-up (Concord)
More washing activities done by employees, not contractor (Walnut Creek)

12. Findings (Continued)
After-hours inspections can enhance the credibility of business inspection program
Knowledge of washing activities in certain geographic areas makes for more successful surveillance
Parking garages not observed to be a problem during the surveillance events (Concord)
Restaurants remain the biggest challenge (Walnut Creek & Concord)

13. Data Analysis

14. What Did We Learn?

15. Outreach letters and restaurant BMPs
More employees training

16. Lessons Learned (Continued)
More territories can be surveyed after-hours
Few supervisory personnel are available after-hours
Nothing going on early Sunday morning
After-hour surveillance component could be built into inspection agreement with CCCSD

17. Questions & Answers