Soil Contamination Testing at Petrol Station

I need a comprehensive soil contamination assessment at a petrol station, focusing on the fuel storage and dispensing areas.

Requirements:
- Testing for chemical, biological, and heavy metal contamination
- Soil sample analysis for contamination levels

Ideal Skills and Experience:
- Expertise in environmental testing and soil analysis
- Experience with petrol station contamination assessments
- Knowledge of relevant environmental regulations and safety standards

Please provide a detailed methodology and timeline with your bids.