# Commercial stormwater retrofit – bio-retention & outfall — St. Louis County, MO

> Commercial stormwater retrofit in St. Louis County, MO: asphalt removal, regrading, an 840 SF bio-retention basin to MSD standard detail and an outfall.

Canonical: https://kueselinc.com/projects/st-louis-county-bioretention-retrofit
Last updated: 2026-10-27

An existing commercial property in St. Louis County needed to bring its parking area into stormwater compliance. Kuesel saw-cut and removed asphalt, regraded the area, and built an 840 SF bio-retention basin to MSD standard detail.

Crews also removed an old inlet, set a new storm sewer outfall structure, and prepared the pavement subgrade to ±0.10' so paving could follow.

|  |  |
| --- | --- |
| Location | St. Louis County, MO |
| County | St. Louis County |
| Year | 2023 |
| Market | Commercial |
| Scope | Asphalt removal, regrading, bio-retention basin, storm outfall, pavement subgrade |

## Challenge → approach

This was a retrofit, not a blank site: the basin had to be cut into a working commercial lot. Kuesel removed only the asphalt needed, built the basin to the MSD standard detail, and tied the new outfall and regraded pavement back into what was already there.

## Scope delivered

- Asphalt removal
- Site grading
- 840 SF bio-retention basin built to MSD standard detail
- Storm outfall structure
- Inlet removal
- Pavement subgrade

## Key quantities

- 840 SF bio-retention basin
- Pavement subgrade to ±0.10'

## Services used

- [Site Utilities](https://kueselinc.com/services/site-utilities)
- [Site Demolition](https://kueselinc.com/services/demolition)
- [Earthwork & Site Grading](https://kueselinc.com/services/earthwork)
- [Water & Sewer](https://kueselinc.com/services/water-sewer)
- [Bioretention Basins](https://kueselinc.com/bioretention-basins)

## Related

- [All projects](https://kueselinc.com/projects)
- [Request a bid](https://kueselinc.com/contact)