Box 1

Did you gather the site information necessary to proceed through the flow chart?

Yes

No or Unsure

Box 2

Prior to using the flow chart, gather the following preliminary information.

  • Conduct site review
  • Define performance goal

Conduct site review

PROCEED TO THE NEXT STEP

Box 3

  • New and redevelopment projects: Retain on site a volume of 1.1 inches from impervious surfaces
  • Linear projects: Retain on site the larger of 1.1 inches from all new or 0.55 inches from all new and fully reconstructed impervious surfaces

PROCEED TO THE FIRST QUESTION

Links

Box 4

Does project create one acre or more of new and/or fully reconstructed impervious surfaces?

PREVIOUS QUESTION and ANSWER: The previous question defined the performance goals.

Box 5

MIDS PERFORMANCE GOAL DOES NOT APPLY
The project creates less than 1 acre of impervious surface.

Box 6

image of a project where ROW will not be constraining
Example of a linear project where site constraints likely do not exist
File:Example limited ROW.jpg
Example of a linear project where ROW will likely be constraining

Is the project linear?

Yes

No

PREVIOUS QUESTION and ANSWER: Does project create one acre or more of new and/or fully reconstructed impervious surfaces? Answer - Yes

Box 7

Are there constraints due to lack of available ROW, off site drainage and/or rate control requirements?

Yes

No

Box 8

Is Flexible Treatment Option (FTO) 2 feasible?

[ Box 57 Yes]

[ Box 10 No]

PREVIOUS QUESTION and ANSWER: Are there restraints due to lack of available right-of-way, off-site drainage, and/or rate control requirements? Answer: Yes

Box 9

image of stop sign
You have completed the flow chart. Return to Flexible treatment options

Select Flexible treatment Option 2. You have completed the flow chart.

  • Provide documentation of offsite runon to project area
  • Provide documentation of lack of right-of-way

Flexible Treatment Option 2 (FTO #2)

Applicant attempts to comply with the following conditions:

  1. Achieve volume reduction to the maximum extent practicable (as determined by the Local Authority), and
  2. Remove 60 percent of the annual total phosphorus load, and
  3. Options considered and presented shall examine the merits of relocating project elements to address varying soil conditions and other constraints across the site.

PREVIOUS STEP: It was determined that the site is linear, there are constraints due to lack of right-of-way or off/site drainage and/or rate control requirements, and a reasonable effort to acquire all of the right-of-way cannot be made.

Box 10

image of stop sign
You have completed the flow chart. Return to Flexible treatment options

SELECT FLEXIBLE TREATMENT OPTION 3

Off-site mitigation (including banking or cash or treatment on another project, as determined by the local authority) equivalent to the volume reduction performance goal can be used in areas selected in the following order of preference:

  1. Locations that yield benefits to the same receiving water that receives runoff from the original construction activity.
  2. Locations within the same Department of Natural Resources (DNR) catachment area as the original construction activity.
  3. Locations in the next adjacent DNR catchment area up-stream.
  4. Locations anywhere within the local authority's jurisdiction.

PREVIOUS QUESTION: It was determined that Flexible Treatment Option 2 is not feasible.

Box 11

Are there zoning and land use requirements that make the Performance Goal not feasible?

Yes

No

PREVIOUS QUESTION and ANSWER:

  • Is the project linear? Answer: No

or

  • Are there constraints due to lack of available ROW, off site drainage and/or rate control requirements? Answer: No

Box 12

Is BMP relocation feasible

Yes

No

PREVIOUS QUESTION and ANSWER: Are there zoning and land use requirements that make the Performance Goal not feasible? Answer: Yes

Box 13

Is Flexible Treatment Option (FTO) 1 feasible?

[ Box 61 Yes]

No

PREVIOUS QUESTION and ANSWER: Is BMP relocation feasible - Answer: No

Flexible Treatment Option 1 (FTO #1)

Applicant attempts to comply with the following conditions:

  1. Achieve at least 0.55 inch volume reduction goal, and
  2. Remove 75 percent of the annual total phosphorus load, and
  3. Options considered and presented shall examine the merits of reloacting project elements to address varying soil conditions and other constraints across the site

Box 14

Is Flexible Treatment Option (FTO) 2 feasible?

[ Box 54 Yes]

No

==PREVIOUS QUESTION and ANSWER: Is Flexible Treatment Option (FTO) 1 feasible? - Answer: No

Flexible Treatment Option 2 (FTO #2)

Applicant attempts to comply with the following conditions:

  1. Achieve volume reduction to the maximum extent practicable (as determined by the Local Authority), and
  2. Remove 60 percent of the annual total phosphorus load, and
  3. options considered and presented shall examine the merits of relocating project elements to address varying soil conditions and other constraints across the site.

Box 15

Is the site located in a DWSMA (Drinking Water Supply Management Area), wellhead protection area, or within 200 feet of a drinking water well?

Yes

No

Box 16

Can a Local Government Unit (LGU) provide a higher level of engineering review to ensure a functioning system that prevents adverse impacts to groundwater?

Yes

[ Box 58 No]

PREVIOUS QUESTION and ANSWER: Is the site located in a DWSMA, Wellhead Protection Area, or within 200 feet of a drinking water well? - Answer: Yes

Box 17

Are there existing or proposed structures or infrastructure (e.g. rate control BMPs, utilities, buildings, roadway, easements) that make the Performance Goal not feasible?

Yes

[ Box 21 No]

PREVIOUS QUESTION and ANSWER:

  • Is the site located in a DWSMA, wellhead protection area, or within 200 feet of a drinking water well? - Answer: No

or

  • Can a Local Government Unit (LGU) provide a higher level of engineering review to ensure a functioning system that prevents adverse impacts to groundwater? - Answer: Yes

Box 18

Is BMP relocation feasible?

[ Box 21 Yes]

No

PREVIOUS QUESTION and ANSWER: - Are there existing or proposed structures or infrastructure (e.g. rate control BMPs, utilities, buildings, roadway, easements) that make the Performance Goal not feasible? - Answer: Yes

Box 19

Is Flexible Treatment option (FTO) 1 feasible?

[ Box 62 Yes]

No

PREVIOUS QUESTION and ANSWER: Is BMP relocation feasible? - Answer: No

Box 20

Is Flexible Treatment Option (FTO) 2 feasible?

[ Box 54 Yes]

No

PREVIOUS QUESTION and ANSWER: Is Flexible Treatment Option (FTO) 1 feasible? - Answer: No

Flexible Treatment Option 2 (FTO #2)

Applicant attempts to comply with the following conditions:

  1. Achieve volume reduction to the maximum extent practicable (as determined by the Local Authority), and
  2. Remove 60 percent of the annual total phosphorus load, and
  3. options considered and presented shall examine the merits of relocating project elements to address varying soil conditions and other constraints across the site.

Box 21

Is karst present on the site?

Yes

No

If you are unsure, we recommend you review the guidance for karst in this manual. To retain your place in this flowchart, either open the karst guidance page in a new tab (right click on the link and select Open Link in New Tab), use the back arrow after visiting the karst guidance page, or use the Breadcrumbs at the top of the page.

PREVIOUS QUESTION and ANSWER:

  • Are there existing or proposed structures or infrastructure that make the performance goal not feasible? - Answer: No

or

  • Is BMP relocation feasible? - Answer: Yes

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PREVIOUS QUESTION and ANSWER:

  • Are there zoning and land use requirements that make the Performance Goal not feasible? - Answer: No

or

  • Is BMP relocation feasible? - Answer: Yes

Discussion

A drinking water supply management area (DWSMA) is the Minnesota Department of Health (MDH) approved surface and subsurface area surrounding a public water supply well that completely contains the scientifically calculated wellhead protection area and is managed by the entity identified in a wellhead protection plan. The boundaries of the drinking water supply management area are delineated by identifiable physical features, landmarks or political and administrative boundaries.

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