SWPPP requirements in Indiana

The construction plan/SWP3 must be submitted to the appropriate reviewing agency (SWCD, MS4, or IDEM) prior to initiation of any land-disturbing activity, and the project site owner must receive notification from the reviewing agency that the plan meets permit requirements BEFORE a complete NOI may be submitted to the commissioner.

After the project site owner has received notification from the reviewing agency that the construction plan/SWP3 meets the requirements of this permit and any applicable municipal separate storm sewer system (MS4) ordinance a complete NOi must be submitted to the commissioner.

For a new project, the NOI must be submitted at least 48 hours prior to any land disturbance or discharge occurring; discharge authorization becomes effective 48 hours after NOI submittal to IDEM.

Why this applies here: This is the deadline for a new site. A transfer to a new operator or an emergency related project has a different deadline.

For a new project, the NOi must be submitted at least 48 hours prior to any land disturbance, or a discharge occurs.

A written evaluation by a trained individual must be completed 24 hours prior to a qualifying precipitation event or by the end of the next business day following each measurable storm event (0.5 inch or more of rainfall within a 24-hour period, excluding snow). If no qualifying rain event occurs during the work week, a minimum of one inspection must still occur that week.

Why this applies here: You have not confirmed whether the site discharges to an impaired or high quality water. If it does, the increased frequency applies instead and this answer changes.

Twenty-four (24) hours prior to a qualifying precipitation event or by the end of the next business day following each measurable storm event (excludes accumulated snow events); which is defined as a precipitation accumulation equal to, or greater than, one-half (0.50) inch of rainfall within a 24-hour period.

"Trained individual": an individual who is trained and experienced in the principles of stormwater management, including erosion and sediment control, as demonstrated by completion of coursework, state registration, professional certification, or annual training.

Why this applies here: This is why Basinwise cannot perform your inspections. The permit requires a trained person physically on the site.

"Trained individual" means an individual who is trained and experienced in the principles of stormwater management, including erosion and sediment control as is demonstrated by completion of coursework, state registration, professional certification, or annual training that enable the individual to make judgments regarding stormwater management, treatment, and monitoring.

Within 7 calendar days.

Why this applies here: This applies at both land disturbance amounts.

Stabilization must be initiated by the end of the seventh day the area is left idle.

Same day the deficiency was discovered, or if not practical, no later than 48 hours after discovery

On the day the deficiency was discovered or when it is not practical to initiate on the discovery date, no later than forty-eight (48) hours for the repair of a measure or installation of a temporary measure until a new and/or replacement measure is installed

Installation of a new (alternative) measure or replacement of an existing measure must occur within 7 days of discovery, unless a shorter timeframe is required as part of a regulatory inspection.

Within seven (7) days of discovery for the installation of a new (alternative) measure or replacement of an existing measure, unless a shorter timeframe is required as part of a regulatory inspection.

Existing natural buffers adjacent to waters of the state must be preserved to promote infiltration and protect the water resource, unless infeasible. Buffers 50 feet or more in width must be preserved to a minimum width of 50 feet; buffers less than 50 feet in width must be preserved in their entirety.

Natural buffers must be preserved, including the entire buffer bordering and/or surrounding the water resource. Existing buffers: 1) 50 feet or more in width must be preserved to a minimum of 50 feet. 2) Less than 50 feet in width must be preserved in their entirety.

All records and information, including self-monitoring program reports and the project management log, must be retained by the permittee for a minimum of 3 years.

Why this applies here: The clock runs from permit expiry or termination, not from when the record was written, so on a multi year project every record stays live for the whole project plus three years.

All records and information must be retained by the permittee for a minimum of three (3) years. All records must be kept by the permittee in such a manner that the reports will be readily available for IDEM compliance staff review.