Document empY28xnora65koJek8ep0vee

FILE NAME: Asbestos Cement Pipe and Sheet (ACPS) DATE: 1968 Feb 26 DOC#: ACPS051 DOCUMENT DESCRIPTION: Unpublished Report - Water Contamination Studies ( Environmental Control Department Research & Engineering Center February 26, 1968 CONFIDENTIAL W. P. Raines - GHQ Water Contamination Studies Asbestos-Cement Pipe _______ San Diego___________ Attached are some figures on ingestion based on San Diego study results, and on inhalation based on the proposed British Threshold Limit Value of two fibers per cubic centimeter. As you can see, we are dealing with very minute quantities. quantity per day is well below inhalation at TLV per day. Ingestion While this comparison is interesting, I don't think.it is quotable. We are comparing apples and oranges. The TLV for ihKalation is known; the TLV for ingestion is not. EMF/ems Attach. cc: F. L. Pundsack S. Speil Att: J. P. Leineweber J. H. Swensen Att: J. F. Herr File C E. M.' Fenner produced JM - 3 CONFIDENTIAL W. P. Raines Attachment Page 1 Feb. 26, 1968 Water Contamination Studies San Diego, California Potable water after two miles through a 17-year old asbestos-cement pipe system had a fiber content increase from .03 micrograms per gallon to 4.0 micrograms per gallon. 1 microgram = 1 x 10"^ grams (.000001 grams) 1 microgram 2,2 x 10-^ pounds (.0000000022 lbs) Assume average daily water consumption is eight glasses, or \ gallon per day. Then daily ingestion of fiber could be: -9 4.4 x 10 lb per day (.0000000044) Proposed British TLV for inhalation of fiber is: 2 fibers per cc or 5.6 x 10^ fibers per cubic foot (56.000) Assume average inhalation rate is 1 CFM. Then TLV = 5.6 x 10^ fibers per minute (56.000) Assume average respirable fiber size is 1. 1 / - ? 2. x 10,-- long x 20 long i'--r-* 'T' -- t "2c ___ Fiber 1 would weigh: 2.2 x 10 ^ lbs Fiber 2 would weigh: 17.6 x 1 0 " ^ lbs Then fibers inhaled per day at TLV. 1. 5.8 x IQ'7 lbs per day (.00000058) 2. 48 x 10"7 lbs per day (.0000048) CONFIDENTIAL W. P. Raines - AttachmentPage 2 Feb. 26,1968 Water Contamination Studies (Cont'd.) Comparison - inhalation va ingestion. A. Inhalation Case 1. 5.8 x 10 ^ lbs per day (.00000058) Case 2. 48 x 10 ^ lbs per day (.0000048) B. Ingestion San Diego: _g 4.4 x 10 lbs per day (.0000000044) E. M. Fenner prJoMd-u8c3ed