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08 June 2010 AGE-NC Project No. 01-0839 Page 3 of 5 The soil-vapor samples will be analyzed by a California Department of Public Health (CDPH)- certified laboratory for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method TO-3; • Benzene,toluene,ethyl-benzene and total xylenes(BTEX compounds),methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol TBA and 1,2- dichloroethane (1,2-DCA); and • Isopropyl alcohol(IPA)as a tracer gas in accordance with EPA Method TO-15. The proposed soil vapor boring locations are illustrated on Figure 2. Field procedures for advancement of borings and collection of soil vapor samples are presented in Section 3.1.Laboratory reports for soil vapor analyses, testing methods, laboratory QA/QC reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. 2.3. REPORT PREPARATION Upon completion of field work and receipt of final laboratory analysis, a report of findings will be prepared presenting the findings of the investigation. The report will include a description of the work performed and results of the sampling and analysis and be signed by a California Professional Geologist. Conclusions, applicable recommendations, and maps will be included in the report. 3.0. FIELD PROCEDURES All field procedures will be overseen by an AGE representative under the supervision of a California Professional Geologist. Soil vapor boring advancement and sampling procedures are described utilizing stainless steel canisters (Summa) and manifold assemblies. Leak testing, purge volume calculations,tracer gas application,purge,sampling and soil boring abandonment procedures are also described below. 3.1. SOIL-VAPOR BORING ADVANCEMENT Probe borings will be advanced using a van-mounted Geoprobe® 5400 direct-push probing unit equipped with 1.25-inch probing rods. Advanced GeoEnvironmen[al,Inc.