Gregory Silling : If you can get to where you can dig underneath the asphalt blocks, you should be able to bust off larger pieces With a sledge hammer-for less handling
While most of the out-gasing has happened and any further weathering of petroleum products is going to be slight, Both this area and the black top have a definite ick
factor for growing food near them !
You can use all of these chunks of Blacktop as large heat absorbing land features for flowers and other non- edible plantings by bur ringing them just flush with the ground
I am anding a link to help you navigate our search engine where you will find a lot of information here at permits in various Threads on '' Crater Gardens " Link Below :
https://permies.com/t/43625/introductions/Universal
https://permies.com/t/39911/sepp-holzer/krater-garden-warm
For the Good of the Craft ! Big AL