"Remark Code"	"Definition"
"<"	"Actual value is known to be less than the value shown"
">"	"Actual value is known to be greater than the value shown"
"E"	"Value is estimated"
"V"	"Value affected by contamination - detections in both env. sample and blanks"
"M"	"Presence of material verified but not quantified"
"ND"	"Not present (for microbiology data)"