i'm marc johnson from the regional water board. i work in the toxic cleanup division, pretty much specifically working on redevelopment projects like you're 70. and i am also working on the adjacent control power plant, so it makes it more convenient. looking at the proposed remedy for pier 70 come it is highly protected. there will be no exposure to the effect of soil that is there now post-development. that is the best way to go. no exposure, no residual health component. construction worker exposure as the manage this can be managed through a health and safety plan. procedure that is pretty standard and simple. one nice thing about the proposed remedy is there is two ways to address here 70 is either remove the soil or be bought it in place. if you remove the soil, there are buildings on top so you could damage or demolish the historic buildings. so this is friendly to the buildings that are there. it has a very low carbon footprint as compared to hauling off several hundred thousand yards of soil and bringing in that much soil.