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20 October 1999 AGE-NC Project No. 99-0645 Page 4 of 5 base of the excavation at a minimum of one sample for every 400 square feet of excavation area. Field procedures for collection of soil samples are presented in Section 4.2. Soil samples will also be collected from the stockpiled soil from the excavation. For soil disposal characterization, a 4:1 composite soil sample will be collected from every 100 yards of soil excavated. Each soil sample will be analyzed by a State of California Department of Health Services (DHS)- certified laboratory for the following constituents: • TPH-g by EPA Method 8015 Modified; • BTEX by EPA Method 8020; and • Fuel oxygenates including methyl tert-butyl ether (MTBE), tertiary-butyl alcohol (TBA), di- isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE) and tertiary-amyl methyl ether (TAME) by EPA Method 8260 Modified. The laboratory report for soil analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. .3.4. REPORT PREPARATION Upon completion of field work and receipt of final laboratory analysis, a report will be prepared presenting the findings of the soil removal activities. The report will include a description of the work performed and the results of the sampling and analysis. Conclusions and applicable recommendations will be included in the report. The report will be in a format acceptable to the PHS-EHD and CVRWQCB, and will be reviewed and signed by a California Registered Geologist. 4.0. FIELD PROCEDURES All field procedures will be overseen by an AGE representative under the supervision of a California Registered Geologist. Procedures for soil excavation, soil sampling, and equipment decontamination are outlined below. Advanced GeoEnrironmental,Inc.