This can turn into a very lengthy and expensive process, which really should have been addressed before your home was put on the market. The gentlemen at Advanced Environmental is very good at explaining the process, the FAQ link can be found here:
Also here are the top three rated soil remediation companies (according to Angie's List) in the area:
All three have an 'A' rating based on over 15 reviews.
Please feel free to contact me if you have any further questions.
Real Estate Salesperson
Houlihan Lawrence, Pelham
1 Pelhamwood Avenue
Pelham, NY 10803
If you do not have a real estate professional, I will be happy to guide you.
Julis B Fee Sotheby's International Realty
Platinum Drive Realty
Certified Buyer Representative