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' GENERAL DYNAMICS <br /> Additional Investigation— Ro 3 SWMU21 Workplan Revised Novenn003 <br /> ' 4.0 Sample Containers, Preservation, and Documentation <br /> ' Soil will be collected in 6-inch by 2-inch brass sample sleeves (hollow stem). After <br /> removal from the sample barrel the ends of the soil sample containers will be covered <br /> with Teflon® plastic sheeting and sealed with slip-on plastic end caps. Groundwater <br /> ' samples will be collected in unpreserved 1-liter amber glass bottles equipped with <br /> screw-on caps. Samples of soil and groundwater collected during the performance of <br /> the scope of work will be properly preserved and documented. <br /> ' After collection of the sample a label containing the following information will be <br /> attached to the sample container; 1) date and time of collection, 2) sample identification <br /> ' number, 3) project number, 4) identity of sample collector, and 5) analysis required. <br /> Sample collection information will be entered onto a Chain of Custody (COC) form that <br /> will accompany the samples during their residency at the site and during transport to the <br /> laboratory that will perform the requisite analysis. <br /> Preservation of the sample(s) will be achieved by placing the sample containers into a <br /> pre-cooled container and maintained at a temperature of approximately 4 °C until the <br /> sample(s) are delivered to the laboratory. Preservation of the sample(s) beyond cooling <br /> is not required. <br /> ' Copies of the COC will be included with the analytical results presented in the report <br /> that will be prepared to document this investigation and remediation. <br /> 5.0 Analytical Protocol and Quality Assurance and Quality Control (QA/QC) <br /> Soil and groundwater samples will be submitted to a laboratory certified by the DTSC <br /> for analysis of the following constituents, <br /> • TPHd using United States Environmental Protection Agency (USEPA) Modified <br /> Method 8015, and <br /> SVOCs using EPA Method 8270c <br /> Samples will be analyzed within the required holding times for the specific analyses. <br /> Attached in Appendix A is a letter from the analytical laboratory, McCampbell Analytical <br /> of Pacheco, CA that states that they have compared the chromatograms from the TPHd <br /> ' analyses from soil samples at S-26 and the groundwater samples from S-33 with <br /> standard petroleum hydrocarbons chromatograms. The laboratory indicated that the <br /> petroleum hydrocarbon detected from the site samples most closely resemble mineral <br /> ' oil. <br /> Laboratory QA/QC will be performed in accord with the requirements for the analysis of <br /> TPHd and SVOCs as specified in the current USEPA SW-846. Field QA/QC will consist <br /> of the inclusion of a trip blank for evaluation of sample cross-contamination during <br /> ' transport of the sample(s). The trip blank will only be included and analyzed for TPHd <br /> CHOW ENGINEERING, INC. 5 <br />