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Soil Excavation Summary Report, August 28,2014 Combined Support Maintenance Shop, California Army National Guard 5 3.0 SUMMARY OF SOIL ANALYTICAL RESULTS ' TPH-Jet was detected at 20 milligrams per kilogram (mg/kg) in both soil confirmation samples collected (CSMS-SO-EX1 and CSMS-SO-EX2). Both of the samples are below the industrial ' ESL (110 mg/kg) and RSL (44 mg/kg). Acenaphthene (0.0029 mg/kg) was detected in the sample collected from CSMS-SO-EX2 below ' both the industrial ESL (16 mg/kg) and RSL (4,500 mg/kg). Fluorine (0.0030 mg/kg) was also detected in the sample collected from CSMS-SO-EX2 below both the industrial ESL (8.9 mg/kg) and RSL (3,000 mg/kg). PAHs were not detected in the sample collected from CSMS-SO-EX1. ' The results of the soil confirmations samples are summarized in Table 2 and the complete laboratory reports are presented in Attachment C. ' 4.0 Investigation Derived Waste During the first day of the investigation (June 25, 2014), excavated soil was place into 29 drums provided by CA ARNG CSMS (Attachment A- Picture 7). However, as presented in Section ' 2.4, more soil was required to be excavated than anticipated. As a result, ECM recommended CA ARNG CSMS procure two roll-off bins to provide additional storage capacity. On June 26, 2014, two roll-off bins were delivered to the site. All excavated soil contained in the drums and ' additional soil from the excavation was placed into the two bins (Attachment A- Picture 8). The soil in the bins was sampled using direct grab methods, transferred into pre-cleaned amber glass, and submitted to BC Laboratories Inc., a California State Certified Laboratory, under chain-of-custody protocol, for analysis of: • TPH-Jet by EPA Method 8015, ' • PAHs by EPA Method 8270 SIM; and ' California Administrative Manual 17 metal . ' The soil waste characterization analytical results were provided to the CA ARNG for waste profile, transportation and disposal. The soil was transported and disposed by Black Gold Industries as non-RCRA Hazardous Waste Soil to US Ecology in Beatty, NV under direct contract with the CA ARNG on August 12, 2014. A copy of the waste manifest and soil ' characterization results is presented in Attachment D. Odd i h 5.0 SUMMARY AND RECOMMENDATIONS During June 25 and 30, 2014, ECM completed soil excavation activities on behalf of the CA ARNG. Approximately 14 cubic yards of petroleum-impacted soil was excavated to a maximum depth of 4-feet below ground surface and clean soil was backfilled to grade. Post excavation soil sample results indicate that petroleum-impacted soil has been removed vertically, as all sample results are below applicable industrial ESLs and RSLs. Additional soil ' remediation is not warranted. If you have any questions, please feel free to call Don Stevens at 916-706-3379.