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• NUG 13 '98 13:33 FR. E A E , SAN FRANCISCO415 981 0801 TO 12094083433-0033 R.14'15 <br /> the analytical method, procedures and required quality control and quality assurance <br /> parameters may be presented in the ERS QAPP. Table 5 gives general guidance to <br /> follow. <br /> Table 5 <br /> Quality Control Samples and DQOs DRAFT <br /> QC sample Number/Frequency Number/FrequencyDOO Comments/Euce tions <br /> FIELD SPECIFIED QA/QC <br /> Background or reference At least one sample should be collected Source samples Upstream-surface water <br /> sample from an area believe to be unaffected by should be at least 3 Up-slope-surface <br /> source contamination. times background. Up-gradient-Ground water <br /> Field Blanks 1 per SDG',per matrix,per method Source samples Water and Air matrix only <br /> should be at least 3 <br /> times the blank. <br /> Travel blanks 1 per SDG',per matrix,per method Source samples Volatile analytes only <br /> should be at least 3 <br /> times the blank. <br /> Equipment blanks 1 per SDG', per matrix,per method Source samples Only when the use of <br /> should be at least 3 decontaminated non-dedicated <br /> times the blank. equipment is involved. <br /> Field Duplicates 1 per SDG',per matrix,per method 50 to 200%D The procedure for collecting <br /> duplicate samples can greatly <br /> effect the reproducibility. <br /> Performance Standards 1 per project, per matrix, per method 75-125%R If available <br /> Selected LABORATORY QA/AC <br /> Method Blank(MB) 1 per SDG',per matrix,per method Stds and samples Mandatory' <br /> should be at least 3 <br /> times the blank. <br /> Matrix Spike 1 per SDG',per matrix,per method on 75.125%R Designate sample on C-O-C <br /> field designated sample. <br /> Matrix Spike Duplicate or 1 per SDG', per matrix,per method on <50 RPD for Designate sample on C-O-C <br /> Replicate field designated sample. Organics <20 RPD <br /> for metals <br /> Reference Standards 1 per SDG',per matrix,per method 75-125%R If available <br /> Internal Standards All samples 50-200%R All GC/MS and some GC <br /> analyses only <br /> Laboratory Control 1 per SDG',per matrix,per method 75- 125%R per method for organic analyses <br /> Standards <br /> SDG-Sample Delivery Group(Maximum 20 samples) <br /> RPD-Relative Percent Difference <br /> %R�Percent Recovery <br /> ]At Isui1-wai ergaRpA15-14-97 <br /> 13 <br />