Document 9x2ZdLmka8amrprrMGbOR1eL

Conoco Chemicals Company (V-wnocw; Conoco Inc. P 0. So* 2197 Houston. TX 77001 October 6, 1980 Geraldine Goodstone 210 East 15th Street New York, NY 10003 Dear Ms. Goodstone: Per our discussion, enclosed are the occupational codes we currently use in our computerized industrial hygiene data storage and retrieval system. With these four digit codes a plant identifier and chemicals company ident ifier is all that would be needed to serve our needs at this time. Please hold these lists as confidential information. The codes for the Alcohol plant at Lake Charles Chemical plant will be shortened to four digits as indicated on the sheet. Sincerely, Thomas G. Grumbles, Director Industrial Hygiene ajo Enclosure CCR 000002534 (conoco) Interoffice Communication to George Haberman Ffom Tom Grumbles Dare September 23 , 1 980 subject LABORATORY BOTTLE WASH FUME HOOD Following is a summary of our discussion on the subject hood and recommendations for improving the situation in the bottle wash room. Recent face velocity measurements showed the hood to average 85 feet per minute. As I understand the operation, this should be sufficient velocity to control the vapors emitted during sample dumping activities. However, these measurements were made under static conditions. The hood was installed adjacent to a frequently used door and the turbulence created by it's opening and closing, as well as the fan placed in the room, greatly reduce the efficiency of the hood. Also the exhaust ductwork from the hood has numerous elbows and an unnecessarily long vertical run to the roof of the building. This also decreases the hood efficiency. The barrel which receives the spent samples is in a position to allow vapors to re-enter the room from outside when the prevailing wind is blowing. To improve this situation, I recommend the following: 1. Move the hood to the position we discussed, away from the door. 2. Seal the hood around the bottom. Currently air escapes from large cracks and holes. 3. Assure that the fan is not used in close proximity to the hood during the sample dumping activities. 4. When pos s i bl e, 1 i mi t the number of heated, open samples to be discarded in the room. If possible open samples should be placed in the hood before dumping. 5. Reassess the ductwork needed to safely exhaust the hood outside the building. It should have as few elbows as possible and a minimum vertical run to safely exhaust the vapors. Once these steps are taken the hood should be reevaluated for face velocity. These steps should increase the effectiveness of the hood and help alleviate employee complaints. Please call if you need further information. '"X-------------------------------------------------- Thomas G. Grumbles ajo cc Han-- '^tera, Harry Garrison CC* 000002585