Soil testing for contamination before buying land

[rrlovesbi]

We are in the process of purchasing an Ag parcel in Mountain View. We discovered that the property had over 25 vehicles previously removed. There is a possibility that the owner was a mechanic but not sure. I just saw a related post on free soil and water testing by the Univ of Hawaii- Manoa for lava affected areas. They will also test for heavy metals, which could indicate contamination.
http://punaweb.org/Forum/topic.asp?TOPIC_ID=25252&SearchTerms=soil,testing

However, are there professional services here that can test the soil? Maybe we are being too concerned because there are plenty of other lots with multiple abandoned vehicles.

Thanks

Robert