acreage calculation

sq. ft. ac.
Permit 490045.99 11.24990794 43560
Excavation 330555.29 7.58850528
stock 11745.43 0.269637971
pond 6860.49 0.157495179
external buffer 469585.67 10.78020363
internal buffer 368618.38 8.46231359
total buffer 100967.29 2.317890037