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' kn KLEINFELDER 5. RESULTS 5.1 RESULTS OF CHEMICAL ANALYSIS The results of chemical analyses on the soil and groundwater are presented in Tables 1,2 and 3 in Appendix A. Thirteen of the fifteen soil samples and all six groundwater samples were submitted under chain-of-custody procedures to Sequoia Analytical Laboratory of Sacramento, California were selected for analysis. Sequoia is a State of California Department of Toxic Substances Control (DTSC) certified laboratory for the analyses requested. The soil samples selected for analysis were based on depth, field observations, and the objectives of ' the work scope. The laboratory data sheets and chain-of-custody records are included in Appendix D. The tabulated soil and groundwater sample analytical results are presented in Tables 1,2, and 3. 5.1.1 Soil Samples ' Semi volatile organics (EPA 8270) were not detected above laboratory reporting limits in soil ' samples analyzed. The volatile organics (EPA 8260), toluene, and methylene chloride were detected in soil samples collected in boring B6/HP-6 and B7. Toluene was reported at 0.11 mg/kg to 0.18 mg/kg in boring ' B6/HP-6, and at 140 µg/kg in B7. Methylene chloride was also detected at concentrations ranging from 0.85 mg/kg to 2.10 mg/kg in borings B6/HP-6 and B7. However, Kleinfelder believes that the concentrations of methylene chloride is probably a false positive, since this methylene chloride is used in the extraction process and therefore periodically reported as a laboratory contaminant. Please refer to the attached letter supplied by Sequoia Analytical discussing these results. ' The fuel fingerprint analyses performed on the thirteen soil samples yielded detections of LJEH in only one of the soil samples analyzed. A soil sample collected from boring B7 at a depth of 15 feet contained 87 mg/kg UEH. The CAM 17 metals detected in the soil samples analyzed included barium, chromium, cobalt, copper, lead, mercury, nickel, thallium, vanadium and zinc at concentrations commonly associated with naturally-occurring background levels. ' Polynuclear aromatic hydrocarbons (by EPA Method 8270) and volatile organics by EPA Method 8260 were not detected above laboratory reporting limits in soil or groundwater at the seven boring locations except for a groundwater sample collected from boring B6/HP-6 which contained 110 ' µg/L of phenanthrene. ' 20-4054-O1.E01/2018R299 Page 9 of 15 © 1998,Kleinfelder,Inc. May 8, 1998