Looking for some help regarding antifreeze in loops. The contractor believed my loops contained methanol. Have not been able to find out when methanol could no longer be used in Iowa. This was replaced with propylene glycol. However, contractor dumped that methanol in my yard. I am looking to find out how this will affect the ground. My 3 dogs got very ill at the same time. I am thinking the methanol as they only go out in my fenced backyard. Any ideas how to make my backyard safe again. Thank you.