| name | swppp |
| title | Stormwater Pollution Prevention Plan (SWPPP) |
| description | Drafts a Stormwater Pollution Prevention Plan (SWPPP) compliant with 40 CFR Part 122, EPA Construction General Permit (CGP), and applicable state NPDES requirements for construction projects disturbing one or more acres. Use when drafting SWPPPs, construction stormwater permits, erosion control plans, NPDES compliance documents, or BMP selection memoranda. |
| author | CaseMark |
| author_url | https://github.com/CaseMark/skills/tree/main/skills/legal/swppp |
| license | Apache-2.0 |
| version | 0.1.0 |
| execution_mode | open |
| jurisdiction | us |
| practice | environmental |
| language | en |
Stormwater Pollution Prevention Plan (SWPPP)
Produces a construction SWPPP covering site characterization, BMP selection, inspection schedules, recordkeeping, and operator certification under the Clean Water Act NPDES program.
Prerequisites
- Project details — name, location (coordinates or legal description), total disturbance acreage, timeline
- Operator identification — entity with day-to-day operational control
- Site characterization — soil types, topography, drainage patterns, existing vegetation
- Receiving waters — all water bodies receiving discharge, distance/direction, 303(d) or TMDL status
- Environmental features — wetlands, endangered species habitat, historic properties within or adjacent to site
- Existing permits — NPDES permit number, state CGP, MS4 requirements
- Site plans / grading plans — if available
Output Structure
1. Cover Page & Certifications
| Element | Requirement |
|---|
| Project name & NPDES permit # | Required |
| Operator name, address, contact | Required |
| Preparer name & qualifications | Required |
| PE seal | If required by state |
| Signature block | Operator or authorized representative — name, title, date |
| Certification language | Full 40 CFR 122.22 certification language |
2. Site Description
- Project narrative (scope, phases, timeline)
- Total site area vs. disturbance area
- Soil types (reference NRCS Web Soil Survey)
- Pre- and post-construction drainage patterns
- Receiving waters table:
| Receiving Water | Classification | 303(d) Listed? | TMDL? | Distance from Site |
|---|
| {name} | {class} | Y/N | Y/N | {ft/mi, direction} |
- Endangered species / historic preservation eligibility determination
3. Best Management Practices (BMPs)
Organize into three categories. For each BMP, specify location, install timing, design spec, and maintenance requirement.
