Document 9141YwJMjwYJgM1xk0R1ZM2dq

wrh/ss 3rd November, 1967 I'll* A, Richardson, Hhe.ll Chemicals, 'Amu tall Laboratory , littinghourno. Kent. Lear Mr. I&aiiardson, I an rlad to anknowledge receipt of your helpful letter of 2nd November concerning, your experiments on tlie possible occurrence of polychlorinated biphenyls in marine birds and thoir e< ;ga. Now t'uit it seems certain that contamination by chlorinated biphersyla iu taking glace wo are keen to follow up end detemi.no just how and where the , oonta'Anation ie taking place. You said over tin telephone tliat you had evidence to suggest tliat tin leakage occurs in the valley of the Liver b'itham, and I eua discretely following up this lead. However, before getting too deeply involved I feel I should enquire as to the nature of the evidence. Is it such as to constitute a very positive indictment, or dose it suggest that the content is marginally greater in that area than elsewhere! This would dearly have an important hearing on the area of search. Tiiere is also the question of whetiior the material detected by Jensen lias its origin in hoondinavia i.e. are there several sources of contamination to be looated? sjn the question of tlie poo: Lble toxic effects, we are as deeply concerned in this particular typo of contamination as your Company is in insecticides, and un you say there iu always the tendency for public bodies to exaggerate . the hasard and for vooal members of the public to create alarm and despondency. Perhaps you could comment on the relative abundance of (a) insecticides (b) chlorinated biphenyls and give your view as to whether the content of (b) ie contributing ranch to tlie asard. Personally 1 believe tliat the overall hassard from those ohloriuatod materials has beer -grossly exaggerated, and tint > DSW 372735 STLCOPCB4098910 the remarkable sensitivity of the test methods has contributed in no small neaeune in causing alara. . ; Youro sincerely. i i P.3, Would you please note our trade name for polychlorinated biphenyls is AKOCLOK. . iJVKH . / r> y.-.i'r +C'\- K DSW 372736 STLCOPCB4098911