Date:Wed, 24 Mar 2004 11:01:54
Indiana administers a general NPDES permit program which includes stormwater associated with industrial activity and is referenced as rule 6 (327 IAC 15-6).
Applicability is based on certain categories of industrial activity based on the company's primary standard industrial classification (SIC) code. However, a company can be exempt from rule 6 by containing and discharging the associated stormwater to wastewater treatment or a sanitary sewer. A company can also be exempt from rule 6 by preventing exposure (making a claim of no exposure).
As part of my cross training at IDEM and in an effort to assist the stormwater group, I have been assigned the task of verifying no exposure claims (EPA forms submitted to IDEM's stormwater group) by visiting such facilities that have made the claims.
In summary, a company considering no exposure should evaluate potential to manage their materials under roof/cover [which also includes managing recyclables and waste materials as well]. One should adopt a good housekeeping plan of action and provide for containment (i.e. storage of drums). Some material storage outside is not an issue with no exposure as long as material is uncontaminated, stored in a regulated container or is not leaking [or showing signs of having leaked].
I hope this information helps.
If there are particular questions regarding rule 6 or requests for assistance, please reply to this e-mail.
Additional information on the Indiana rule 6 program can be found at http://www.in.gov/idem/water/npdes/permits/wetwthr/storm/rule6.html.
stormwater group and OPPTA