Document RJzBEZVyzQBQ6Vdw3LMgG1MGz

R. B. Hayden -2- September 20, 1972 6.3.2 "Clip filter holder to lapel or shirt pocket as close as possible to the person's mouth. This method of personnel sampling is pre ferred." Suggest consideration be given to changing wording from "mouth" to "breathing zone". p) 6.3.5 "Turn on pump and set at approximately two (2) liters per minute ' rate. Check rate periodically. When finished sampling, turn off pump, and record elapsed sampling time. Sampling record forms, EN-2731 (See Figure 3) are available from Stationery Stores,.Eng. Dept., Wilmington, Delaware." Suggest consideration be given for use of an inline orifice (screwed into filter adapter) which meters air flow automatically, and removes chance of error in setting flow manually. These adapters are available from Millipore Corporation. 6.4 "Analysis. Completed samples (exposed filters) are placed in a mail ing tube,sealed and sent to a qualified laboratory with two copies of the sampling record. Include~an unexposed filter with the sample which has been handled in the same fashion without drawing air through it. Qualified laboratory information is available from Haskell Laboratory." Suggest consideration be given to clarify whether one (1) unexposed filter is required for each sample, or one (1) unexposed filter is required for each lot of exposed filters, which may be as many as six (6) or eight (8) in the same mailing tube. Also suggest each exposed sample be put in a plastic envelope before placing in the mailing tube. Typical Sampling Record Form EN-2731 Suggest consideration be given as to definite value of recording "Weather-Temperature-Relative Humidity". Requirement of this may necessitate additional equipment, and forms, when samples are taken at several Plant sites simultaneously, where temperature and relative humidity conditions vary greatly. JMC/WJV/Jn Per: J. M. Coleman SPRUANCE FIBERS 4^ Venable DUP 0902956