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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 2C 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 /> • TPH-d and TPH-mo using United States Environmental Protection Agency <br /> (USEPA) Modified Method 8015 <br /> All water samples will be run both under standard analysis and a second sample after a <br /> silca gel separation to remove polar hydrocarbons (mainly alcohols and organic acids) <br /> from the sample. Since the TPH-d/mo analysis reports the total of all hydrocarbon, this <br /> dual sampling will enable to establish the ratio of non-polar (pure hydrocarbons) to polar <br /> (oxidized hydrocarbons) compounds. This will indicate the degree of remediation that <br /> has occurred from natural and enhanced bioremediation (or to what extent the <br /> introduction of hydrogen peroxide was successful in remediation). <br /> Samples will be analyzed within the required holding times for the specific analyses. <br /> Laboratory QA/QC will be performed in accord with the requirements for the analysis of <br /> TPH-d and TPH-mo as specified in the current USEPA SW-846. Field QA/QC will <br /> consist of the inclusion of a trip blank for evaluation of sample cross-contamination <br /> during transport of the sample(s). The trip blank will be included and analyzed for TPH- <br /> d and TPH-mo. <br /> Copies of the field and laboratory QA/QC will be included with the analytical results in <br /> the report that will be prepared to document this investigation. <br /> CE Project No.99F-4041 <br /> Additional Investigation Work Plan 6 <br />