levels determined in ottawa drinking water were 17 ppt alpha-bhc , 1.3 ppt lindane , 0.7 ppt aldrin , and less than 0.05 ppt for each of heptachlor , heptachlor epoxide , dieldrin , endrin , chlordane , o , p'-ddt , p , p'-ddd , p , p'-ddt , and p , p'-dde .
C0019219
heptachlor
C0019220
heptachlor epoxide