Document NnzEqOp9R2vew9EeO0Gj0Zgg

AR226-2431 INTEROFFICE MEMORANDUM Datei Fron; Deptr Tel No; 05-AUQ-193 08:30aW EDT Roger J- Zipfel ZIPFEL PPD-SPD 304-863-2567 TO: 2 addressees CC: 5. addressees Subject: C-8 in site drinking water The attached communication puts some perspective on the recent results of C-8 in our site's drinking water. Roger. AJPQ0734 EID128090 V`V f \ C-8 IN WASHINGTON WORKS DRINKING WATER Recent sampling of the four Washington Works drinking water wells have shown C-8 levels of 0.1, 0.5, 2.0 & 3.3 parts per billion. These values are surprisingly high but do not pose a health threat to our employees. The allowable exposure level of C-8 for our employees is set by our corporate M L . This level is 0.01 mg/m3 or 0.56 ppb. This is an airborne control level. A control level for employee drinking water has not been set because such a control level was not deemed necessary. Exposure to C-8 is best understood by examining the AIL on a daily dose level basis. At the AEL an employee can be safety exposed to a 12 hour dose of 0.10 mg of C*8. If an employee were to drink water with a G-8 level of 3.3 ppb he would only be exposed to a daily dose of 0.006 mg., or l/2bth of the AEL (note: C-8 is essentially fully absorbed by the human body if breathed or consumed). At this time all operating areas on site are in compliance to the AEL for airborne C-8 exposure. The slight additional exposure imposed by drinking water with C-8 levels of 3-4 ppb should not affect our compliance to the daily dose of C-8 allowed by the M L , We should not get confused by the current CE6 (Community Exposure Guideline) for C-8 in water of 1.0 ppb. This guide level is for exposure to the general public and not for the healthy workforce here on site. However, this situation should not be taken lightly. The site enviromental group and the C*8 team will endeavor to fully understand these recent sample results and provide you with future programs. Attached is the technical basis for the allowable dose exposure levels from Haskell. EXD128091 AJP000735  > * A WORKER EXPOSED TO THE ALLOWABLE AIRBORN CONCENTRATION (AEL) OF 0-8 OF 0.01 MG/M3 WOULD RESULT IN A DAILY DOSE OF 0.1 MS PRESENTED TO HIS/HER LUNQ DAILY. THIS AMOUNT IS ACCEPTABLE AND WILL NOT PRODUCE ADVERSE HEALTH EFFECTS. THE COMMUNITY EXPOSURE GUIDE OF 0.0003 MQ/M3 IS RECOMMENDED FOR THE GENERAL POPULATION ID WOULD RESULT IN A DAILY DOSE OF 0.006 MS PRESENTED TO HIS/HER LUNG DAILY. THE DIFFERENCE IN RECOMMENDED CONCENTRATIONS IS THAT A) THE COMMUNITY DOES CONTAIN PERSONS WHO MIGHT BE MORE SUSCEPTIBLE TO THE ADVERSE EFFECTS OF CHEMICALS (THE AGED, THE YOUNG, THOSE WITH PRE-EXISTING DISEASE CNDITIONS THAT MIGHT MODIFY THEIR ABILITY FOR NORMAL WORKING SCHEDULES) AND THAT B) THE EXPOSURE IS CONTINUOUS (24 HOUR) INSTEAD OF INTERMITTENT. A WORKER DRINKING WATER CONTAINING 3 PPB AND DRINKING ONLY FROM THE PLANT WOULD GET A DAILY DOSE (IN HIS 2 LTERS/DAY) OF 0.006 MG (PRESENTED TO THE GASTROINTESTINAL TRACT). THIS CAN BE CO WARED TO THE AEL ACCEPTABLE DAILY DOSE OF 0.1 MG/DAY. RECOGNIZE HOWEVER THAT THE AMOUNT POTENTIALLY ENTERING THE BODY IS ADDITIVE AND THAT AMOUNTS ENTERING VIA INGESTION NEED TO BE CONSIDERED IN ADDITION TO THAT ENTERING FOLLOWING THE USUAL INDUSTRIAL ROUTES (DERMAL AND INHALATION). I HOPE THERE IS SOMETHING USEFUL IN THESE "TALKING POINTS". EID128092 AJP000736