we took readings on a 10'-0" grid as the "documentation toolkit" indicates. In some cases, our fc go from 40fc to 10fc. Obviously between these two readings, some of the area will still be compliant (min 25fc) but because our readings are only @ 10'-0" increments, does that mean none of it qualifies? Your example shows the area between 26fc and 15fc as non-compliant, which isn't eactly true, a portion of it could be at 25 fc. Is it acceptable to do an average between the two meter locations or take readings every 2'-0" or 5'-0" or something? Thanks in advance.