Laserfiche WebLink
Cave Contractors, Ackton -2- 1 e to er 1987 <br />detector. Interference from bromides and chlorides, as claimed In the <br />• plan, s .. •mentioned 1 • Carefulquality <br />assurance/quality control (QA/QC) procedures should significantly <br />reduce rcommonlaboratory <br />The work plan proposes to use larger (50 gram) waste samples for <br />preparation of '' extractfor analysis. increase <br />concentrations of PCBs In the sample extract, thereby permitting <br />analysis at lower PCB -in -waste concentrations and with improved <br />accuracy. <br />® The work plan proposes to pass the samples through a *10 sieve prior <br />to analysis. This procedure may bias the sample by favoring small <br />particles. Shredder waste contains many sizes of particles, and all <br />are relevant in the determination of total PCB concentrations for <br />comparison with State and Federal standards. <br />Based on the above notes, additional sampling and analysis will help to <br />refine our knowledge about the distribution of PCBs in wastes at the <br />Cove Contractors' site. I recommend that Kleinfelder be asked to make <br />adjustments to their sampling and"analytical work plan based on i r <br />comments. e currentlyexisting PCB data, however, mustbe • • <br />In the overall assessment of the problem. <br />