ARCHIVED REPORTS SOIL EXCAVATION SUMMARY

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Soil Excavation Summary Report, Combined Support Maintenance Shop, California Army National Guard 3.0 SUMMARY OF SOIL ANALYTICAL RESULTS August 28, 2014 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). 15 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 metals. 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. 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.