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

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

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

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

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)

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

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

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)

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)

Data Analysis

What Did We Learn?

Outreach letters and restaurant BMPs More employees training

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

Questions & Answers