Document 44XmJZgDpJa79nXKnKQX0br9Q

*KV. SUM UTUUMOHOI E. I. du Pont de Nemours & Company incorporate CHAMBERS WORKS QCCFWATCR. NCW JCRSCY M02) May 12, 1981 TtLKPHONC Arca cooc Of-m*SOOO C-09'22-"s Dwight L. Loughborough Coordinator of Laboratory Accreditation American Industrial Hygiene Association 475 Wolf Lodges Parkway Akron, OH 44311 Dear Dr. Loughborough: We have reviewed the procedure and technique with the analyst who has been doing the asbestos counting. We have also reviewed the summaries of performance for the asbestos filters over the last four years. This review indicates that there has been a gradual deterioration in the accuracy of our results. This appears to be due to deterioration in visual acuity due to aging. For these reasons, we have elected to discontinue our use of this person as our asbestos counter. Since our Haskell Laboratory (presently accredited for organic solvents) has agreed to seek certification in asbestos counting, the Chambers Works Environ mental Health Laboratory has elected not to train a replacement and requests that the Laboratory be removed from the asbestos PAT Program and the related laboratory accreditation for asbestos counting. However, we do wish to main tain our accreditation as an industrial hygiene laboratory and to continue our participation in the PAT Program for inorganic lead and organic solvents. I trust the above actions will meet with the Committee's approval and that a return Co full accreditation status for the Laboratory is forthcoming. Thank you for your cooperation. Sincerely Karl A, Chen, Senior Chemist Environmental Health Laboratory KAC/wlk Dup 0906314 RECEIVE J m i.4 i98t itSKEU. LABORATORY BETTER THINGS BETTER LIVING . . THROUGH CHgMtSTRY TMII PAPER It COLORCO WITH OU PONT OYCS SC-DP-06950