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.v r ti SHERWOOD LABS CORPORATION Quality Control Program Page : 2 7• Interlaboratory comparison studies when available, completion of the initial validationProcesswhen Project data is compiled into a formatted data is camPlete all review. Included in the contentsof the Packeta are ge for Peer liabilit applicable to method completeness and rP y, comments MONITORINGOFMETHOD PERFORMANCE _ ` 1 • REAGENTS AND GLASSWARE Method and reagent bl&nks verify that interferences caused b contaminants in water, solvents, reagents or glassware used in � the method y are known and accounted for during the Procdata reduction. A reagent blank is analyzed Whenever asnewf reagent source is used for extraction or carried through each step of the analyticalean-up. Blanks are Process. a• All solvent and reagent information including date of receipt, SUPWlier and the assigned unique lab entered into a standards log nook. oratory ID is 2. STAND, A►iD5 I Standards are used to calibrate instruments and to monitor the long term reliability of the analytical results. standards are Prepared from certified working sources supplied by EPA or chemical su pj�mary reference PF iers. a. Complete preparation information for including each standard teclludingnPrimaonssource, ou c ,Supplier, date of unique laboratory P e paration and the preparation, ed book. Y ID is entered into the standards log b. when a new standard source or stock soli tion validation of working dilutions must be made is Prepared acceptance for use. Previously evaluated batchesrior ato re used j as a basis for comparison. Side-by--side analysis of two z� separate batches must Of the reported_-value.Y�Fad-lu eta meet thidifferences not srequirementn - --- -.-- -will result in the rerunning of validation- - -- - --- 5�6 analyses. In the event that the rerun batch fails to meet � 2 criteria standards must be Performance } re-Prepared. y.