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• All samples will be analyzed for Title 22 Metals by EPA Method 6010. Samples with any total metal concentration greater than or equal to 10 times the respective STLC and below the TTLC will be further analyzed for soluble metals using EPA Waste Extraction Test (WET) methods. • Samples with concentrations at least four times in excess of the standard for a California Hazardous Waste based on the WET will be analyzed for toxicity characteristic leaching procedure(TCLP) soluble lead using EPA 1311 to determine if they are also a RCRA waste. • Soil samples with soluble (WET) metal concentration greater than 5.0 mg/1 will be further analyzed using deionized water(DI-WET)as extractant following EPA Test Method 7000. • Ten percent of samples will be analyzed for pH using EPA Test Method 9045 • Selected soil samples based on field screening will be analyzed for total petroleum hydrocarbons as gasoline (TPHg); benzene, toluene, ethylbenzene, total xylenes (BTEX); and methyl tertiary butyl ether(MTBE) using EPA Methods 8015/8021B/8260. Laboratory QA/QC procedures will be performed for each method of analysis with specificity for each analyte listed in the test method's QA/QC. QA/QC measures as applicable will include the following: • One method blank for every ten samples, batch of samples or type of matrix, whichever is more frequent. • One sample analyzed in duplicate for every ten samples, batch of samples or type of matrix, whichever is more frequent. • One spiked sample for every ten samples, batch of samples or type of matrix, whichever is more frequent,with the spike made at ten times the detection limit or at the analyte level. The laboratory will be instructed to homogenize the soil samples tested for metals in accordance with Contract 06A1141 requirements. Report Preparation We will prepare a site investigation report to present our findings and conclusions. The report will summarize(but not be limited to)the following: • Project introduction/description • Investigative methods • Investigative results and field observations • Data statistical analysis and discussion • Conclusions and recommendations • Tabulated sample analytical data • Vicinity Map • Site Plans for each project location that depict boring and sample locations • Appendices including laboratory reports and COC documentation SR-99/Monitoring Stations,Task Order No.89 Caltrans Contract 06A1141,EA 10-OK3201 Project No.S9200-06-89 -4- November 17,2009