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1 <br /> 1 <br /> Test Methods for Evaluating Solid Wastes Physical/Chemical <br /> Methods, EPA SW-846, 3rd edition, November 1986 <br /> Leaking Underground Fuel Tank Manual, State Water <br /> ' Resources Control Board, State of California Leaking <br /> Underground Fuel Tank Task Force, revised October 1989 <br /> with Appendices A-M <br /> 1 Tn-Regional Board Staff Recommendations for Preliminary <br /> Investigation and Evaluation of Underground Tank Sites, <br /> ' Central Valley Regional Water Control Board, August 30, 1991 <br /> The laboratories selected to perform the analytical work will be certified by the <br /> ' Office of Environmental Health Hazard Assessment <br /> Quality Assurance/Quality Control <br /> ' Qualityassurance/quality control (QA/QC) measures will be taken to confirm the <br /> q tY � ) <br /> integrity of the field and laboratory data generated during the monitoring program <br /> ' The procedures used to assess data quality are described in this section An <br /> evaluation of the field and laboratory quality assurance data will be included in the <br /> technical reports <br /> Field Quality Assurance Procedures <br /> ' Field quality assurance procedures will be included in each monitoring event and <br /> include documenting field instrument calibration, and collecting and analyzing trip <br /> ' blanks, field blanks, and duplicate samples <br /> Trip and field blanks. Trip and field blanks will be used during the sampling <br /> ' events to detect contamination introduced through sampling procedures, external <br /> field conditions, sample transportation, container preparation, sample storage, and <br /> the analytical process <br /> ' Trip blanks will be prepared at the same time and location as the sample containers <br /> for a particular sampling event Trip blanks will accompany these containers to and <br /> ' from that event, but at no time opened or exposed to the atmosphere One trip <br /> blank for volatile organic parameters will typically be included for each sampling <br /> event <br /> Field blanks will be prepared in the same manner as trip blanks but will be exposed <br /> to the ambient atmosphere at a specified monitoring point during sample collection <br /> ' to determine the influence of the external field conditions on sample integrity One <br /> 1 C - 14 <br />