levels of the organochlorine insecticides endrin , gamma-bhc ( lindane ) , dieldrin , ddt and its primary metabolite dde , heptachlor and its primary derivative heptachlor epoxide , and methoxychlor were all below the detectable limits of 0.005-0.010 microgram/liter .
C0019219
heptachlor
C0019220
heptachlor