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05 June 2008 AGE-NC Project No. 95-0141 Page 3 of 8 ground water samples in the selected shallow(water table),intermediate(near 60 to 90 feet bsg),and deep(greater than 100 feet bsg)ground water sampling intervals identified by the CPT sounding and the current monitoring well network screen intervals. Proposed CPT sounding and soil boring locations are shown on Figure 2. CPT advancement and testing procedures are outlined in Section 3.1. Ground water sampling procedures are outlined in Section 3.2. The ground water samples will be analyzed by a State of California Department of Public Health (CDPH)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline (TPH-g), in accordance with EPA Method 8015 Modified; and • Benzene,toluene,ethylbenzene,and total xylenes(BTEX),and fuel additives tertiary butyl alcohol(TBA),di-isopropyl ether(DIPE),methyl-tertiary-butyl ether(MTBE),ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), ethylene dibromide (EDB), and 1,2-dichloroethane(1,2-DCA),by 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. MONITORING WELL INSTALLATION AGE proposes to install one deep ground water monitoring well in the former UST area,as part of additional site assessment activities, to define the vertical extent of hydrocarbon-impacted groundwater in the source area, approximately 5-10 feet south of existing ground water extraction well EX-2. The location of the proposed monitoring well is illustrated on Figure 2. 2.3.1. Drilling and Soil Sampling \l A truck-mounted,hollow stem drill rig equipped with 8-inch diameter hollow-stem augers will be utilized to advance the monitoring well boring to approximately)18 feet bsg. The depth of the well G screen was based on previous soil evaluation from boring CPT-1.The total depth of the boring may vary according to hydrogeologic/geologic conditions encountered during drilling. Selected soil samples collected during the boring operations will be analyzed by a CDPH-certified laboratory for the constituents listed in Section 2.2. Laboratory reports for the soil analyses, testing methods, Advanced GeoEnvironmental,Inc.