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09 January 2017 • AGE Project No. 00-0769 Page 4 of 9 encountered during drilling. Proposed soil boring locations and proposed groundwater sampling depths are as follows: • One soil boring will be advanced to approximately 165 feet bsg approximately 340 feet north-northeast of boring CPT-17, on the east side of EI Dorado Street just south of East Anderson Street, to delineate the downgradient lateral and vertical extent of hydrocarbon-impacted groundwater previously reported from CPT-17. Grab groundwater samples will be collected at depths of 120 feet, 145 feet, and 165 feet bsg; • One soil boring will be advanced to approximately 165 feet bsg approximately 230 feet east of boring CPT-15 to delineate the downgradient lateral and vertical extent of hydrocarbon-impacted groundwater previously reported from CPT-15. This boring is proposed on private property, AGE will attempt to secure access to the property from the property owner. However, if AGE is unable to secure access to the property, an alternate boring location is proposed approximately 440 feet east of boring CPT-15, on the west side of South Hunter Street. Grab groundwater samples will be collected at depths of 50 feet, 80 feet, 145 feet, and 165 feet bsg; • One soil boring will be advanced to approximately 145 feet bsg approximately 290 feet southeast of boring CPT-4, to delineate the downgradient lateral and vertical extent of hydrocarbon-impacted groundwater previously reported from CPT-4. This boring is proposed on private property, AGE will attempt to secure access to the property from the property owner. However, if AGE is unable to secure access to the property, an alternate boring location is proposed approximately 270 feet southeast of boring CPT-4, on the south side of East Clay Street. Grab groundwater samples will be collected at depths of 50 feet, 80 feet, 120 feet, and 145 feet bsg; and • One soil boring will be advanced to approximately 165 feet bsg approximately 340 feet north of boring CPT-13, on the south side of West Jefferson Street, to delineate the downgradient lateral and vertical extent of hydrocarbon-impacted groundwater previously reported from CPT-13. Grab groundwater samples will be collected at depths of 50 feet, 80 feet, 125 feet, and 165 feet bsg. The proposed soil boring locations are illustrated in Figure 4. Groundwater 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 8015M; and • Benzene, toluene, ethyl-benzene, and total xylenes (BTEX), fuel additives MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromide (EDB), and 1,2- dichloroethane (1,2-DCA) in accordance with EPA Method 82608. Advanced GcoEnvironmental Inc.