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Groundwater Monitoring Plan 6 <br /> 3.7 Field and Laboratory Quality Assurance/Quality Control (QA/QC) <br /> 3.7.1 Field QA/QC <br /> As part of the groundwater monitoring program, additional samples will be collected in the field as <br /> QA/QC samples and willinclude the following: <br /> ■ Field Duplicates. Field duplicates will be taken at a frequency of one duplicate sample <br /> per 10 samples or portion thereof at each facility. <br /> ■ Field Equipment Blanks: One field equipment blank will be collected for each day of <br /> sampling when non-disposable sampling equipment is used. There will be no equipment <br /> blank samples associated with disposable sampling equipment. <br /> 3.7.2 Laboratory QA/QC <br /> To achieve data quality for this monitoring program, the analyses for this investigation will be <br /> performed using accepted laboratory procedures in accordance with specified analytical protocols. <br /> A laboratory certified in the State of California under the Environmental Laboratory Accreditation <br /> Program (FLAP) will perform the analyses. Analyses will be performed in accordance with SW-846 <br /> test methods. Together with this monitoring plan, these procedures will provide a baseline level of <br /> documentation. <br /> Laboratory quality control acceptance criteria that will be applied to samples analyzed during this <br /> project will meet SW-846. Quality control results attributed to sample matrix effects will be <br /> documented and noted in the laboratory reports. <br /> Reporting limits for this project will be both the method detection limit (MDLs) and Practical <br /> Quantitation limits (PQLs). The laboratory will report concentration values at the lowest possible <br /> reporting limit. The decision thresholds identified for this investigation were based on Water <br /> Quality Goals specified in the State of California Regional Water Quality Control Board (RWQCB) <br /> for the Central Valley Region (August 2000). <br /> 3.7.3 Data Verification <br /> During the verification process, the laboratory data will be subject to review for QC outliers, <br /> anomalies and potential noncompliance with project requirements for the following elements: <br /> ■ Date and time of sample collection -required to uniquely identify sample and assess any <br /> holding time limitations; <br /> ■ Chain-of-Custody documentation -required to demonstrate integrity of samples and <br /> maintain unique identity of samples;it includes a unique sample identification number, <br /> sample collection date and time, and signature of the persons relinquishing and receiving <br /> the sample; <br /> p:\Wp\jobs\20587\CAO GW W'orkplan.doc—DCN 12495 January 2002 <br />