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State of Ca!+fornia • • . • Department of Health Services Memorandum �_ To Jim Pinasco 14 to U V 1 - SMU, Region 1 Dote MAR — 1989 Subject: Sharpe QAPP Via Fran Anderson �� kr" Environmental Assessment Unit Toxic Substances Control Division From 400 P Street, 4th Floor MAR 23 1989 ATSS 8-492-6984 ENVIRONMENTAL HEALTH PERMIT/SERVICE Per your request, I have reviewed the final Quality Assurance Project Plan for Sharpe Army Depot dated July 1988 . comments are listed below. My All analyses should be performed by a California certified laboratory. The QAPP should define specific QA/QC objectives that must be met and should define exactly how QA/QC data that do not meet these specific QA/QC objectives will be used to qualify corresponding environmental sample data. Section 2 . 0 The moving average for both precision and accuracy control charts might not be appropriate. As stated above, specific QA/QC objectives should be defined for both precision and accuracy. Section 3 . 2 page 3-5 Explain rationale for rinsing VOC sample bottles 3 times before taking a sample. Section 3 . 4 If sampling equipment is to be used again, a "rinsate blank" should be obtained to show effectiveness of cleaning. Section 3 . 5 If sampling equipment is to be used again, a "rinsate blank" should be obtained to show effectiveness of cleaning. Section 4 0 page 4-. A more definitive description of "Lot" should be provided. A minimum number of samples that will comprise a "lot" should be provided. It would also be useful to provide an approximate number of samples that will comprise a lot for each type of analysis. Section 6 . 2 page 6-2 The Certified Reporting Limit should not be defined as "the statistically resolvable quantity above the background concentration" . It appears that "background concentrations" will be subtracted from sample concentrations. The rationale for this is flawed and background correction must not be done.