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Appendix F: Data Usability Summary <br /> • Ammonia nitrogen by SM 20 4500NH3 B/C modified. <br /> • Boron, calcium, iron, magnesium, manganese,potassium, and sodium by EPA Method <br /> 6010B. <br /> • Chloride, sulfate,nitrate, and nitrite by EPA Method 300.0. <br /> • Kjeldahl nitrogen by EPA Method 351.2. <br /> • Specific conductance by SM20 2510 B. <br /> • Total hardness as calcium carbonate(CaCO3)by SM 18 2340B. <br /> • Total dissolved solids by SM20 2540 C. <br /> • Total phosphorus as phosphate(PO4)by EPA Method 365.1. <br /> The data was evaluated in general conformance to the requirements of project objectives <br /> specified in the following documents: <br /> • Quality Assurance and Quality Control: Sample Collection, Handling, and Analysis <br /> Guidelines; Chevron Historical Pipeline Portfolio Sites, California,April 2007. <br /> • SAIC Technical Procedure TP-DM-300-7,Data Validation. <br /> • SAIC Technical Procedure TP-DM-300-14,Evaluation of Field and Analytical Data. <br /> INTENDED USES OF THE DATA <br /> Laboratory data are being used for site evaluation and decision making for petroleum releases <br /> attributed to Chevron's historical crude-oil and Bunker C fuel-oil pipelines. The data generated <br /> will be compared to Regional Water Quality Control Board water quality objectives and may be <br /> used for risk assessment purposes. <br /> Data QC Objectives <br /> SAIC-Benham evaluated project analytical data according to the following parameters to <br /> determine their usability: <br /> • Precision <br /> • Accuracy <br /> • Representativeness <br /> • Completeness <br /> • Comparability <br /> DATA USABILITY SUMMARY <br /> The following sections summarize the findings of the data evaluation process. Immediately <br /> following data are validation qualifiers used in the data evaluation: <br /> ualifier Description <br /> E Indicates the reported value is estimated due to associated QC results. <br /> J Indicates the reported value is an estimated concentration detected between the <br /> method detection limit(MDL)and limit of quantitation(LOQ). <br /> F-2 __Zr-_ The Benham companies.LLC <br />