Page 126 - California Stormwater Workshop Handouts

Industrial General Permit Fact Sheet

Dischargers should be aware of the potential unintended public health concerns
associated with treatment control BMPs. Extensive monitoring studies conducted by
the California Department of Public Health (CDPH) have documented that
mosquitoes opportunistically breed in structural BMPs, particularly those that hold
standing water for over 96 hours. BMPs that produce mosquitoes create potential
public health concerns and increase the burden on local vector control agencies that
are mandated to inspect for and abate mosquitoes and other vectors within their
jurisdictional boundaries. These unintended consequences can be lessened when
BMPs incorporate design, construction, and maintenance principles developed
specifically to minimize standing water available to mosquitoes12 while having
negligible effects on the capacity of the structures to provide water quality
improvements. The California Health and Safety Code prohibits landowners from
knowingly providing habitat for or allowing the production of mosquitoes and other
vectors, and gives local vector control agencies broad inspection and abatement
powers.13

Dischargers who install any type of volume-based treatment device are encouraged
to consider the BMPs in the California Department of Public Health’s guidance
manual published July 2012, “Best Management Practices for Mosquito Control in
California” at
http://www.cdph.ca.gov/HealthInfo/discond/Documents/BMPforMosquitoControl07-
12.pdf.

4. Monitoring Implementation Plan

Dischargers are required to prepare and implement a Monitoring Implementation
Plan (Section X.I of this General Permit). The Monitoring Implementation Plan
requirements are designed to assist the Discharger in developing a comprehensive
plan for the monitoring requirements in this General Permit and to assess their
monitoring program. The Monitoring Implementation Plan includes a description of
visual observation procedures and locations, as well as sampling procedures,
locations, and methods. The Monitoring Implementation Plan shall be included in
the SWPPP.

J. Monitoring and Reporting Requirements

1. General Monitoring Provisions

This General Permit requires Dischargers to develop and implement a facility-
specific monitoring program. Monitoring is defined as visual observations, sampling
and analysis. The monitoring data will be used to determine:

12 California Department of Public Health. (2012). Best Management Practices for Mosquito Control in California. <
http://www.westnile.ca.gov/resources.php>. [as of February 4, 2014]
13 California Health & Safety Code, Division 3, Section 2060 and following.

Order 2014-0057-DWQ 42