minimum concrete cover above 24 cmp

huangyhg

minimum concrete cover above 24" cmp
do you guys know what is the minimum concrete cover above a 24 in cmp (corrugated metal pipe) to be placed underneath an access road?  is there a standard detail that might have this information?
thanks  
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aashto section 12 " corrugated metal structure interaction systems" will have what you are looking for.
auce98
for concrete cover i am not aware of a minimum. sometimes the pipe manufacturer may have that info. typically its  compacted soil or gravel cover requirements.