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30 May 2014 AGE Project No. 13-2557 Page 4 of 5 • Ethyl benzene was detected in the excavation bottom sample at a concentration 0.025 mg/kg, benzene was not detected in samples collected; total xylene was detected in the excavation bottom sample at a concentration 0.155 mg/kg. • Ethyl benzene was detected in the stockpile sample at a concentration 0.41 mg/kg; benzene was not detected in samples collected; toluene was detected in the stockpile sample at a concentration 0.485 mg/kg; total xylene was detected in the excavation sample at a concentration 2.489 mg/kg. • Methyl tertiary butyl ether (MBTE) was detected in the excavation sample at a concentration 7.23 mg/kg. MBTE was detected in the stockpile sample at a concentration 5.58 mg/kg. • 1,2-dichlorobenzene, 1,2,4-trichlorobenzene were detected in the excavation stockpile sample at concentrations of 0.365 mg/kg and 5.38 mg/kg, respectively. 1,2,4-trichlorobenzene and 1,2,4-trimethylbenzene, were detected in the excavation stockpile sample at concentrations of 0.207 mg/kg and 2.43 mg/kg, respectively. • Total lead was detected in the UST excavation and soil stockpile samples collected at concentrations of 17.8 mg/kg and 244 mg/kg, respectively. No additional constituents of concern were detected during the UST removals. The analytical report (Project No. 4050109) and chain of custody form are included as Attachment C. 5.0. CONCLUSIONS AND RECOMMENDATIONS The UST was removed from the sidewalk of the site under the permit and oversight of the EHD. During the UST removal, field evidence of hydrocarbon impact was noted within the UST excavation area in samples collected for analysis. Furthermore, during removal of the tanks, visual evidence (holes) of locations where leaks could occur were noted in the removed tank. Based on field observations from the tank and tank excavation, as well as the analytical results of soil samples, and considering the presence of relatively shallow groundwater at the site (10 feet bsg), AGE recommends the issuance of an unauthorized release report for the tank and open the case for corrective action under State Water Code. Once the site has been accepted into the EHDs Local Oversight Program (LOP), a work plan should be prepared for an initial investigation of the lateral and vertical extent of contamination. Advanced GeoEnvironmental,Inc.