A large truck (Class 7 or 8) drove off the road accidentally near our house and a tank fell off its flatbed that leaked thousands of gallons of liquid onto the soil. This tank also took out part of our fence. I didn't see the accident and only witnessed the damage hours after I got home from work. The truck driver came by that night to tell us what happened and that he would pay for the damages. He said it was his teenage daughter's first time driving the truck and that's why the accident happened. I took his contact info and said I would get pricing on the repairs and let him know. Our neighbor Jim, stopped by later that night and said he witnessed the accident. Apparently the police were not called due to the insistence of the truck owner saying no one was else involved and there were no injuries. Jim sent me many pictures of the truck, tank and items that fell off the flatbed when the accident happened. As I walked around the area, I noticed a chemical smell. When I texted the truck owner, he said the 5000 gallon tank was full of potable water and two 5 gallon plastic containers of gas were spilled, but nothing else. Jim said he suspected there were chemicals that leaked. Jim helped them reload their items that fell out of the truck after they pulled the truck and tank out of the ditch with another large vehicle they had. Jim rinsed his hands in the "potable" water since the truck owner said that was fine and there were no chemicals in it. Jim had a reaction to it, itching, burning, eye pain and even after a shower, was still suffering the effects. I contacted the truck owner again. He said there was a container of adjuvant for the uniform distribution of soil applied pesticides and nutrients that spilled but he could drink a glass of it with no ill affects (he called it orange juice). He provided the information on it (label). Several days later, my trees in the area started dying. This was in the area where the potable water drained and at least 60 feet from the area where gas leaked. The tank rolled down the hill, through the fence and into my yard. After researching the adjuvant and discussing it with soil remediation experts, this adjuvant could not have caused the tree damage. Two soil remediation companies quoted $18,000+ to test and clean up the area. When I told the truck owner the remediation had to be done by a professional and the pricing, he said "I will pay for 5 yards of gravel, your fence repair and replace your trees. That's it." The Environmental Protection Agency has been contacted but soil test results will take 10 business days before we know what is there. Is my next action to hire an attorney (what practice area?) and work to resolve the issue in a civil court? We will need to pay the remediation costs ourselves since we don't want the damage to spread when it rains and it is close to our well. Any insight is appreciated to help navigate this. Thanks.