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4. Inclusion of a trip blank, (consisting of deionized or distilled water in a sample bottle that is prepared in a manner identical to the preparation of all other sample bottles for that analytical technique) in each shipment of sample bottles to a sampling location. 3.4.. Miscellaneo-u_s_Cbecks of Accuracx 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 deionized (or distilled) water will be poured into a laboratory-cleaned, teflon bailer and then discharged from the bailer to the appropriate .sample bottle(s). 2.5 Miscellaneous Checks of,Accuracy- Where trace analysis is involved, purity of the solvents, reagents, and gases employed is of great concern. 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. 4.0SITE SAFETY PLAN This plan addresses safety provisions to be employed during the site investigative filed work in the vicinity of 3725 Tracy Boulevard, Tracy, 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 plan describes personnel responsibilities and protective equipment to be worn as appropriate when working on the site. 4.1 Personnel Responsibilities Key personnel directly involved in the investigation who will be responsible for monitoring the execution of safe work practices and the provisions of this plan are the drilling subcontractor project supervisor and the Delta proiectJjgU mang= These personnel are responsible for knowing the provisions of the plan, communicating plan requirements to workers under their supervision and to site visitors, and for enforcing the plan. 4:2 Personnel Protection The designated personnel-protective equipment is selected to prevent filed personnel from exposure to gasoline fuel products that may be present at the site. To prevent direct skin contact, the following protective clothing will be worn as appropriate while working at the site: L