ARCHIVED REPORTS_XR0007378 CASE 2

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UNDERGROUND STORAGE TANK REMOVAL AT&T MICROWAVE RELAY FACILITY LODI,CALIFORNIA 46 Analytical Methods Selected soil samples were analyzed for the following constituents • Total Petroleum Hydrocarbons- Diesel fuel (TPH-D,EPA Method 8015 Modified), • Benzene, Toluene, Ethylbenzene, and Total Xylenes (BTEX,EPA Method 8021 A), • Volatile Organic Compounds (VOCs, EPA Method 8260), • CAM 17 Metals (EPA Method 6010), and • Cyanide(EPA Method 9012) 47 Site Restoration Following removal of the UST, class II roadbase material was Imported to the site and compacted Into the excavation by Kvaerner 5.0 INVESTIGATIVE RESULTS -DISCUSSION 51 UST and Piping Condition • The UST was inspected by ATC and no ruptures or holes were observed Product piping did not appear to have leaked No free product was present Inside the UST at the time of its removal 52 Soil Condition Backfill material surrounding the UST consisted of pea gravel to an approximate depth of 14 feet bgs Native soil in the base and walls of the excavation consisted of silty fine sand Petroleum hydrocarbon odors or stains were observed in the base of the north end of the UST excavation No groundwater was encountered in the base of the excavation 53 Laboratory Analytical Results The soil samples were submitted to Sequoia Analytical (DOHS Certification No 1210) for laboratory analysis A summary of the soil analytical results is presented in Tables 5-1 and 5-2 Copies of the laboratory analytical reports and Chain-of-Custody Forms are presented in Appendix E The laboratory results indicate that confirmatory soil samples collected from the UST excavation had TPH-D concentrations ranging from 18 ppm to 4,900 ppm BTEX and MTBE were not detected in the excavation confirmatory soil samples The stockpile soil samples, had TPH-D concentrations ranging from 82 ppm to 2,800 ppm One stockpile sample had a total xylenes concentration of 0 13 ATC Associates Inc 61059 0029 4