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MAR-24-99 16 37 From WOODWARD CLYDE + T-735 P 05/34 Job-402 <br /> coating and contaminating the baiter and rendering the sample invalid <br /> The objective of this efflcccy testing is 1)identify if there is a difference in sampling accuracy between the <br /> chock-valvo bailor and the KABIS Sampler,and 2)identity if purging is actually necessary to obtain an accurate <br /> (lower sampling error)sample when using the KASIS Sampler. <br /> Work conducted by Gibb, et al 1981 and Schuller&Griffin, 19816 attempted to identity T general <br /> characteristics of an accurate sampling system These general characteristics are <br /> 1 simplicity of operation <br /> 2 ruggedness <br /> 3 high portability <br /> 4 field scrrtceable <br /> 5 easily decontarrunated <br /> 6 provision for variable flow rate <br /> 7 provtde far nunuiial disumbwea of groundwater solution Composition <br /> Doom TMG Q Mai jv 06GIOMM <br /> ® Further work tested that hypothesis(Barcelona,et al, 1984)by identifying five mechanical groupings of sampling <br /> mechanisms They were <br /> 1 Grab <br /> 2 Positive displacement-bladder <br /> 3 Positive displacement-mechanical <br /> 4 Gas dtsplgcement <br /> 5 Other <br /> These studies indicated that the most accurate combination of field activity and sampling mechanism was the <br /> check-vahm boils in conjunction with purging,or the tllaidder purrlo in concert with well purging It show be no ad, <br /> that the KAKIS Sampler is a newly developed sampler and was not awaiilabio for evaluation during Barcelona's work <br /> in 1964 We attempt by this work to provide such a comparison <br /> With these previous works in mind,and the groundwork already laid in the Barcelona,et.al (1984)paper,the viability <br /> and accuracy of the KAKIS Sampler was compared to that of a check-valve bailer using The Barcelona 3-Tiered <br /> Evaluation Structure The first level of testing consists of evaluating performance according to the fourteen criteria in <br /> Table 2 The second level of testing consists of evaluating the potential differences between purging and not purging <br /> before sampling The third level of testing involves the difference in sensitivity and accuracy of the two samplers for <br /> compound-specific contaminants <br /> • 3124/99 b 21 I'M <br /> 4of14 <br />