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w ` N1 �.i. 3.3 Analytical Quality Assurance In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: I) U.S. Environmental.Protection Agency (EPA) and State certification programs. 2) Participation in an inter-laboratory or "round-robin" quality assurance program. 3) Verification of.results with an alternative method. For example, calcium may be determined by atomic absorption, ion chromatography, or titrimetric methods. Volatile organics may be determined through either purge and trap or liquid-liquid extraction methods. 4) Inclusion of a trip blank, (consisting of de-ionized or distilled water in a sample bottle that is prepared in a manner,Wentical to the preparation of all other sample bottles for that analytical technique) in each shipment of sample bottles to a sampling location. 3.4 Field Ouality Assurance To insure that proper sampling procedures are followed in the field,one field blank will be collected for every ten ground water samples collected in the field. Procedures for collection of the field blank will be identical to these for collection of the ground water samples, with the exception that de- ionized(or distilled)water will be poured into a laboratory cleaned, teflon bailer and then discharged from the bailer to the appropriate sample bottle(s). 3.5 Miscellaneous Checks of Accuracy Where trace analysis is involved, purity of the solvents, reagents, and gases employed is of great cgncern. .. . The laboratory maintains a service contract on all major instrumentation: gas chromatographs, atomic absorption, ion chromatography, and total organic carbon analyzers are all serviced and maintained regularly. The above program is more than sufficient for most needs. Additional quality assurance, such as spikes and duplicates on all analyses, will be provided if requested. 4.0 SITE SAFETY PLAN This plan addresses safety provisions to be employed during the site investigative field work in the vicinity of 549I "F"Street,Banta, California. The objective of the plan is to describe procedures and actions to protect the worker, as well as uninvolved parties, from inhalation and ingestion of, and direct skin contact with, potentially hazardous materials that may be encountered at the site. The