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AdvancedGeo 09 January 2019 Environmental AGE Project No. 99-0559 � G Page 4 of 7 2.3. SOIL BORING AND SOIL VAPOR SAMPLING AGE proposes to advance a total of two (2) pilot soil borings to 6.5 feet bsg for installation of depth discrete soil vapor wells to investigate potential petroleum vapor intrusion impact to nearby sensitive areas. One (1) soil-vapor well is proposed on the north side of Waterloo Road, adjacent to August Elementary School; and one (1) soil- vapor well is proposed on the west side of Sutro Avenue, adjacent to the residential area to the south of the site (Figures 2 and 3). Proposed soil borings will be advanced using a 4-inch diameter hand auger. Soil samples will not be collected from these borings. Soil-vapor samples will be analyzed by an ELAP-certified laboratory for the following constituents: • TPH-g in accordance with EPA Method TO-15; • BTEX and naphthalene in accordance with EPA Method TO-15; • Fuel additives including MTBE, TBA, DIPE, ETBE, TAME EDB and 1,2-DCA in accordance with EPA Method TO-15; • Percent oxygen (fixed gas) in accordance with analytical method ASTM D 1946- 90; and • Tracer compound isopropyl alcohol in accordance with EPA Method TO-15. Laboratory reports for soil-vapor analyses (lowest possible detection limits), testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain-of-custody documentation will be presented in a report with the findings and recommendations. EDF files of the laboratory analytical results will be submitted to the State of California GeoTracker database. The procedures for soil vapor well installation and sampling are presented in Section 3.0. 2.4. REPORT PREPARATION Upon completion of field work and receipt of final laboratory analysis, a report 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. Conclusions, applicable recommendations and maps will be included in the report. The report will be in a format acceptable to the CVRWQCB and will be reviewed and signed by a California Professional Geologist.