Get a bid: Ask the company to explain the situation and what steps they will take to correct it. They should always perform a thorough visual inspection and answer any questions you may have.

Ask about experience: A professional company will be happy to tell you about other jobs like yours that they have completed. They should tell you what type of personnel will be involved in your job, and share with you their experience, qualifications and references.

Make sure they know state laws and ordinances: A reputable company will know all of the local laws and ordinances regarding wash water regulations and storm drain conveyance. In California, YOU could be fined up to $25,000 PER INCIDENT if the company you hire does not follow these ordinances.
Ask what (if any) chemicals will be used: Many companies use harsh chemicals for cleaning which, of course, are bad for the environment. And, if the company does not reclaim wash water, the chemicals could go right to the storm drain which could result in fines (see item 3).
Ask how they will do the job. Find out exactly what they will be doing. They should be asking you questions in order to evaluate the job thoroughly. Also ask about industry standards and affiliations they have.
Get a Contract: The scope of the work being completed should be identified in writing. The schedule and costs should also be thoroughly outlined.
We are here to help! If you have any questions or need another bid, please feel free to contact us. 619-749-6388. We look forward to helping!