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7 z • 28 August 2017 Advanced AGE Project No. 14-3096 ` " Page 4 of 7 Laboratory reports of soil analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report of findings and recommendations. Additional discrete soil samples are not proposed to be collected from the borings; the site geology framework and sampling depths have been established. 2.4. MONITORING WELL INSTALLATION, DEVELOPMENT, AND SURVEY One of the soil borings, northwest of the site (MW-14) will be drilled to a total depth of 90 feet for collection of grab groundwater samples backfilled from 90 feet to 65 feet with bentonite pellets; and subsequently completed as a Zone B groundwater monitoring well with proposed screened depths of approximately 50 feet to 65 feet bsg. Depth of the screened interval may vary according to hydrogeologic conditions encountered while drilling. Following installation, the well will be developed to maximize water flow and minimize the amount of fine-grained sediment drawn into the well during pumping or bailing. The top of each newly installed well casing (well head) will be surveyed to determine its elevation relative to North American Vertical Datum 88. An as built diagram of the proposed construction of the proposed wells has been included as Figure 8. 2.5. GROUNDWATER SAMPLING AND ANALYSIS Following the installation of the new monitoring well, groundwater monitoring and sampling activities will be conducted at the wells on a quarterly basis for a minimum of one year (four sampling events); monitoring activities will include recording depth to groundwater measurements and collection of groundwater samples for laboratory analysis by a CDPH-certified laboratory. The 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), tetrachloroethylene (PCE), trichloroethylene (TCE), and Naphthalene in accordance with EPA Method 82608. Laboratory reports of soil analysis, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report of findings and recommendations.