the pesticides detected and their mean concentrations in parts per trillion were aldrin ( 0.9 ) , heptachlor epoxide ( 3 ) , heptachlor ( 0.6 ) , alpha-bhc ( 6 ) , gamma-bhc ( 3 ) , endrin ( 4 ) , dieldrin ( 1 ) , o , p'-tde ( 1 ) , o.p'-ddt ( 3 ) , and o , p'-dde ( 0.2 ) .
C0019220
heptachlor epoxide
C0019219
heptachlor