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Mr. Ross Atkinson <br /> Mauch 30, 2001 <br /> Page 7 <br /> Data Quality <br /> This section presents the data quality criteria to support the project objectives. The <br /> establishment of a QA/QC system will provide the baseline for measuring data quality in <br /> terms of precision, accuracy, completeness,and representativeness of actual site <br /> conditions. <br /> To achieve the data quality needed to support the project objectives, all analyses for this <br /> investigation will be performed using accepted laboratory procedures in accordance with <br /> specified analytical protocols. A laboratory certified in the State of California under the <br /> Environmental Laboratory Accreditation program (FLAP) will perform the analyses- <br /> Analyses will be performed in accordance with SW-846 test methods.Together with the <br /> sampling plan, these procedures will provide a baseline level of documentation. <br /> Laboratory quality control acceptance ct:itezla that will be applied to samples analyzed <br /> during this project will meet SW-846. Quality conaol results attributed to sample matrix <br /> effects will be documented and noted in the laboratory reports. <br /> Reporting Limits. Reporting limits for this project will be both the method detection <br /> limit(MDLs) and Practical Quantitation h its (PQLs). The laboratory will report <br /> concentration values at the lowest possible reporting limit The decision thresholds <br /> identified for this investigation were based on Water Quality Goals specified in the State of <br /> California Regional Water Quality Control Board(RWQCB) for the Central Valley Region <br /> (August 2000), specifically PHGs. <br /> Data Verification. During the verification process,the laboratory data will be subject to <br /> review for QC outliers,anomalies and potential noncompliance with project requirements <br /> for the following elements: <br /> • Date and time of sample collection-required to usvquely identify sample ind <br /> assess any holding time limitations; <br /> • Location of samples,including depth,if appropriate -required to uniquely <br /> identify samples (these data will be provided in the field logbook); <br /> ■ Chain-of-Custody do+mmentation- required to demonstrate integrity of <br /> samples and maintain unique identity of samples;it includes a unique sample <br /> identification number, sample collection date and time,and signature of the <br /> persons relinquishing and receiving the sample; <br /> • Field QA/QC procedures - required to demonstrate sample integrity;it <br /> includes field decontamination procedures to prevent cross-contamination,the <br /> collection of field blanks, and the collection of duplicate samples during each <br /> sampling activitt; <br /> ■ Name and location ofd laboratory -required for chain-of-custody <br /> documentation and to verify credentials of laboratory; <br /> P:\wp\IUM\20587\102257C;fDV.d rCt%'P.&C <br /> EVV-d 810/800 d ddl-1 OV60VIM6 11TACIVO ONV NMOH-woad mrOO: [[ 1004-0£—ada <br />