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5.0 Analytical Protocol and Quality Assurance and Quality Control (QA/QC) ' Soil and groundwater samples will be submitted to a laboratory certified by the DTSC for analysis of the following constituents, ' ■ TPHd using United States Environmental Protection Agency (USEPA) Modified Method 8015, and • 0&G using EPA Method 5520 ' Samples will be analyzed within the required holding times for the specific analyses. In discussions with the laboratory both before the original RFI workplan was developed and confirming again recently, TPHd and O&G analyses will capture the entire range of ' hydrocarbons encompassed by mineral oil that was stored in the tank. We have been told by the laboratory that reference to a mineral oil standard would provide only qualitative information from the laboratory, but would not add any quantitative information not already achieved by the TPHd and O&G analyses. Therefore the analyses to be run will be TPHd and O&G. Laboratory QA/QC will be performed in accord with the requirements for the analysis of TPHd and O&G as specified in the current USEPA SW-846. Field QA/QC will consist of the inclusion of a trip blank for evaluation of sample cross-contamination during transport of the sample(s). The trip blank will only be included and analyzed for TPHd and O&G if two (2) groundwater samples are transported to the laboratory in the same cooler. ' Copies of the field and laboratory QA/QC will be included with the analytical results in the report that will be prepared to document this investigation. 6.0 Investigation Report Preparation ' Upon completion of field operations, a report will be prepared and submitted to DTSC. The report will include, 1) a description of the work performed, 2) methodology for data collection, 3) soil boring logs, 4) analytical results, 5) site sketch indicating the location of borings and areal extent of excavation, 6) interpretation of field and analytical data, and 7) recommendations, if any for further work. Field activities and the preparation of 1 the report will be under the direct supervision of a geologist or an engineer registered in the State of California. 7.0 Signature This workplan has been prepared under the direction of the person listed below. � 3j 63 ' an Wanzek, P.E. Dat CE Project No. 99R-4041 Additional Investigation Work Plan 6