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r M KLEINFELDER TPH-G was detected at concentrations ranging from 87 to 290 mg/kg. Total lead was detected at ` 6.0 and 6.6 mg/kg. CONCLUSIONS AND RECOMMENDATIONS The following conclusions and recommendations are based upon Kleinfelder's sampling activities and analytical results. 1. Organochlorine pesticides were not detected in the field areas of the subject site at or above laboratory reporting limits. Based on this finding and assuming normal application of pesticides in the past and length of time between Kleinfelder's sampling and estimated time of site development, Kleinfelder does not recommend additional sampling for ` organochlorine pesticides. Pesticide mixing and storage areas were not identified in Kleinfelder's Phase 1 Environmental Site Assessment. ` 2. PCBs were not detected in the single soil sample collected beneath the pole-mounted transformer located in the eastern central portion of the site. Kleinfelder does not r recommend additional sampling for PCBs at this location. 3. Initial sampling beneath the AST area indicated elevated levels of TPH-D at a depth of ` approximately 5 feet bgs. TPH-D ranged from 3300 to 6200 mg/kg. TPH-G was detected at 480 to 900 mg/kg. r, 4. Diesel/gasoline impacted soil beneath the three former AST's was excavated. The excavation was approximately 22 by 15 by 14'/2 feet deep. A total of seven discrete confirmation samples were collected within the excavation and analyzed for petroleum r constituents (See Page 4). With the exception of background lead concentrations, no requested petroleum constituents were detected in three sidewall samples and one bottom sample analyzed by the laboratory. TPH-D was detected at concentrations ranging from ` 1.7 mg/kg to 5.1 mg/kg in one sidewall soil sample and two bottom samples, the deepest collected approximately 16 feet bgs. .. 5. The total lead concentrations detected in the AST area (4.0 to 6.7 mg/kg) are below hazardous waste criteria according to Title 22 of the California Code of Regulations (per 22CCRs66261.24.) and based on Kleinfelder's experience are typical of naturally- occurring background lead concentrations in the general area. 6. The concentration of petroleum constituents detected in confirmation soil samples r collected within the AST excavation in Kleinfelder's opinion would not generally trigger requirements for additional clean up of soils. 7. The stockpiled soil excavated from the AST area should be remediated onsite (such as soil aeration) or hauled offsite in accordance with local, state and federal regulations. Confirmation sampling of the soil is recommended if onsite remediation is selected and 21073/ST03R1067 July 28,2003 r O 2003 Kleinfelder,Inc. Page 6 of 8 V