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-18- CHAPTER 4 CONTRACT LABORATORY QUALITY ASSURANCE QCD contracts only with laboratories which maintain the highest standards for RCRA groundwater monitoring. All analyses except for field testing (pH, conductivity) and naphthenic acids are conducted at a Department of Health Services (DOHS) certified laboratory. The contract laboratory is expected to meet the following conditions : 4 . 1 LABORATORY SAMPLE CUSTODIAN a . In the laboratory, a sample custodian receives the samples, inspects the samples and sample seals, reconciles information on the Official Sample Label and Seal against that on the Request-for-Analysis/Chain-of-Custody record, logs the sample in a laboratory log book, and stores the sample until analysis . b. The sample custodian inspects the sample container for leakage or any internal pressure which could be hazardous and cause possible loss of portions of the sample. Any discrepancies in information found on labels, seals or Chain-of-Custody records are resolved before testing . Resolution of discrepancies requires communication between laboratory supervisors, sample collectors, laboratory custodians and any others involved in the sample. All dis- cussions and observations are noted in the contract laboratory ' s receiving log. C . The laboratory custodian assigns a neutral identifica- tion number to the sample. This is the contract laboratory ' s identification number for which all work on the respective sample is filed and invoiced under . 4 . 2 QUALITY CONTROL The following are essential for the bench level quality control program: . Parameter spikes, minimum of 5% of all samples . . Matrix spikes, minimum of 5% of all samples. . Standard addition be conducted whenever significant changes in matrix background occur .