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RECEIVED 11 April 2016 AGE Project No. 16-3650 ,;I- ! Q 2016 Page 3 of 4 ENVIRONMENTAL HEALTH DEPARTMENT activities. Additional CPT literature is included in Appendix C. Selected grab groundwater samples will be analyzed by a State of California Department of Public Health (DPH)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline(TPH-g) in accordance with EPA Method 8015M; and • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), and fuel additives methyl tertiary-butyl ether (MTBE), tertiary-butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2- dibromoethane (EDB), 1,2-dichloroethane (1,2-DCA) and Naphthalene in accordance with EPA Method 8260B. Laboratory reports for ground water analysis, testing methods, and laboratory quality assurance / quality control (QA/QC), 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 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, updated maps, and cross-sections will be included in the report. The report will be in a format acceptable to the RWQCB, and will be reviewed and signed by a California Professional Geologist. 3.0. FIELD PROCEDURES All field procedures will be overseen by an AGE representative under the supervision of a California Professional Geologist. Procedures for the advancement of CPT borings, groundwater sampling, equipment decontamination, sample shipment, and laboratory analysis are outlined below. 3.1. CPT ADVANCEMENT Four CPT soil borings will be advanced vertically to total depths of approximately115 feet bsg utilizing a 25-ton truck-mounted CPT drill rig equipped with 1 3/-inch diameter hollow-stem rods. A hydraulic ram will be utilized to advance a cone penetrometer tip to the total depth of the P-11 CPT boring. Soil parameters such as cone penetrometer tip resistance, sleeve friction, friction ratio (ratio between sleeve friction and tip resistance), and pore water pressure will be continuously measured as the cone penetrometer is Advanced GeoEnvironmental,Inc.