LOC Data lower/above from value Dataframe Pandas

Question

I\'ve this code:

import pandas as pd

df = pd.DataFrame({\'SITE\':[\'A\',\'B\',\'C\',\'D\',\'E\',\'F\',\'G\',\'H\',\'I\'],\'SIDE_A\': [0,10,25,65,84,125,258,369,521