| Warehouse and office rent |
Fixed |
Model at $4,500 per month within the current operating range. |
Spreading rent across jobs and hiding true monthly burn. |
| Hazmat liability insurance |
Fixed |
Model at $2,800 per month as recurring overhead. |
Treating insurance as tied to each project invoice. |
| X-ray fluorescence analyzer maintenance |
Fixed |
Model at $600 per month before contribution margin. |
Leaving maintenance out until equipment fails. |
| Specialized containment materials |
Variable |
Model at 12% of revenue in the first year. |
Using a flat monthly budget despite job volume swings. |
| Hazardous waste disposal fees |
Variable |
Model at 8% of revenue in the first year. |
Treating disposal as overhead instead of job-driven expense. |
| Laboratory analysis fees |
Variable |
Model at 5% of revenue in the first year. |
Burying lab fees in admin overhead. |
| Field safety equipment replacement |
Variable |
Model at 4% of revenue in the first year. |
Ignoring replacement needs as crews complete more jobs. |
| Fleet vehicle leases |
Semi-fixed |
Model at $3,200 per month, then step up when crews expand. |
Assuming vehicle capacity scales smoothly with revenue. |