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Pre-Design Investigation Workplan Former Manufactured Gas Plant—Lodi, California 2.5.2 Surface Soil Sampling (2006) In February 2006, nine surface soil samples (SS-1 through SS-9) were collected by ENV America and analyzed for one or more of the following analytical tests: gasoline-range petroleum hydrocarbons (TPHg); benzene, toluene, ethylbenzene and xylenes (BTEX); diesel-range petroleum hydrocarbons (TPHd); motor oil-range petroleum hydrocarbons (TPHmo); California Title 22 (CAM 17) Metals; volatile organic compounds (VOCs); semi-VOCs (SVOCs [including PAHs]); polychlorinated biphenyls (PCBs); organochlorides, herbicides; and cyanide. The 2006 surface soil sample results are included in Appendix A and summarized as follows: • Detected carcinogenic PAH (CPAH) concentrations expressed as the Benzo(a)pyrene (B[a]P) equivalent concentration ranged from 0.2888 mg/kg to 170.07 mg/kg,with elevated concentrations occurring in the northeast corner of the Site in the footprint and vicinity of the former automobile garage, the southeast quadrant of the Ste in the vicinity of the former lampblack separator, the southwest quadrant of the Site in the vicinity of the former gas holder #3, and along the west property limit between the two former gas holders. • Several metal compounds were detected in all nine surface soil samples. Lead was detected at the highest concentrations out of all metals compounds analyzed. Lead concentrations ranged from 3.2 to 24,800 mg/kg with all but two samples exhibiting lead concentrations greater than 80 mg/kg. • TPHd and TPHmo were detected in all nine surface soil samples at concentrations ranging from 16 to 4,900 mg/kg and 19 to 7,700 mg/kg, respectively, with the highest concentrations occurring in the northeast corner of the Site in the footprint of the former automobile garage and in the southern section of the Site in the vicinity of the former lampblack separators and former gas holder #3. TPHg was not detected in any of the samples above the laboratory reporting limit. • BTEX compounds, other VOCs, PCBs, organochlorides, and herbicides were not detected above the laboratory reporting limits in the nine surface soil samples. 2.5.3 Cultural Resources Survey (2007) In September 2007, Garcia and Associates (GANDA) conducted a cultural resources survey at the Site to evaluate if the general shop and store room building (meter house) was historically significant. The report concluded that the building was not historically significant as assessed under the California Environmental Quality Act (CEQA) guidelines. The results of the survey are presented in the report entitled Historical Resources Evaluation Report for the Pacific Gas and Electric Company Lodi Former Manufactured Gas Plant General Shop and Store Room/Meter House Building,prepared by Garcia and Associated, dated September 2007. Subsequent to the survey the general shop and store room building(meter house) was demolished in April 2008. TERRA PACIFIC GROUP Page 5 April 4, 2012