When we bought our wash in 2018 we had an environmental survey done. We're in Michigan which is heavily polluted by years and years of the manufacturing industry. As I understand it, since the government wants the polluted land to be used an owner can conduct an environmental study at the time of purchase and be relieved of liability for cleanup of existing pollution in the future. A baseline needs to be found though. That requires a phase 1 study. Our phase 1 cost $1800. It only consisted in a site visit and a check of historical documents and historical aerial views. We are right next to a gas station that has had tanks leak over the years and a chemical factory/foundry sits right behind our property. Given that there are currently monitor wells on our property which monitor the leaks at the gas station and the nearby foundry our environmental company recommended a phase 2 which consisted of drilling holes using instruments to measure the volatile chemicals coming from the ground. There were chemicals found but none which required remediation for the car wash reno that we were doing. The phase 2 cost us $2900. All of this cost was on us as the buyer per our negotiated contract, but the seller had no reason to pay for this because the liability protection for us in the future was worth it to us. Just sharing our experience. Hope it helps.