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FN Appendix 8—Subject Properties and Adjacent Sites Summaries Port of Stockton, Stockton, CA 305 FYFFE AVENUE,SITE 47 The potential contaminants of concern at Site 47 are arsenic and PAHs. The potential medium affected is soil. Since the 1940s, Site 47 has been used for several purposes, including as a construction yard, equipment storage area, housing area, and a skeet/trap shooting range. From 1995 to 2020, contaminants detected above reporting limits in soil included: numerous inorganic metals, semi-volatile organic compounds (SVOCs), TPH-motor oil, VOCs, organochlorine pesticides (OCPs), and polychlorinated biphenyls (PCBs). Remediation is actively occurring at Site 47. LUCs are in place at this site for non-residential use, including a requirement that Site 47 be used solely for industrial and Port related activities. The presence of contaminants at this site and its proximity to the Site (<500 ft) represent a REC for the Site. 305 FYFFE AVENUE,SITE 50 The potential contaminants of concern at Site 50 are lead and waste oil (motor, hydraulic, and lubricating), and the potential medium of concern is groundwater. Site 50 is a former battery storage area that also included interior and exterior sumps, an interior floor drain, and an exterior storm water catch. On March 28th, 2012, Site 50 received a No Further Action letter. LUCs are in place at this site for non-residential use. The historical release of contaminants to groundwater at Site 50, given its proximity to the Site (<500 ft) and associated LUCs, represents a CREC for the Site. 517 ROUGH AND READY ISLAND, NCS BUILDING#517 The potential contaminants of concern at NCS Building #517 are leaded gasoline and diesel, and the potential media affected are groundwater (not drinking water) and soil. Two 4,000- gallon single wall steel LUSTs containing these contaminants were closed and removed in 1990. There is a LUC associated with this site. The historical release of leaded gasoline and diesel at Building #517, given its proximity to the Site (<500 ft) and associated LUC, represents a CREC for the Site. 816 ROUGH AND READY ISLAND, NCS BUILDING#816 The potential contaminant of concern at NCS Building #816 is waste oil (motor, hydraulic, lubricating) and the potential media affected are soil and groundwater. In 1989, a 4000-gallon waste oil LUST was removed from the site. A 2009 groundwater monitoring report noted the presence of benzene, toluene, ethylbenzene, and xylenes (BTEX) in groundwater samples collected around Building #816, with benzene concentrations exceeding the maximum contaminant level. There is a LUC associated with this site. The historical release of waste oil at Building #816, given its proximity to the Site (<500 ft) and associated LUC, represents a CREC to the Site. 817 ROUGH AND READY ISLAND, NCS BUILDING#817 A LUST is located at this site, and the contaminant of concern is regular gasoline. The potential media affected are soil and groundwater. In 2019 and 2022, soil vapor samples and groundwater samples collected near Building #817 yielded elevated concentrations of TPH-