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Table 4 Geosyntec Consultants,Inc. <br /> 2025 Groundwater Sampling Plan <br /> Rough and Ready Island, <br /> Stockton,California <br /> VOCs TPHg TPHd,mo <br /> 2025 Monitoring EPA EPA Bio-geochemical <br /> Well ID Area Operable Unit Site EPA Method <br /> p Activities Planned Method Method Indicators(r) <br /> 8260B 8260B 8015B <br /> W-285 N/A Site 47 Gauge <br /> W-307 N/A Site 50 Gauge <br /> W-308 N/A Site 50 Gauge <br /> W-309 N/A Site 50 Gauge <br /> W-310 N/A Site 50 Gauge <br /> W-311 N/A Site 50 Gauge <br /> W-312 N/A Site 50 Gauge <br /> W-313 N/A Site 50 Gauge <br /> Notes&Abbreviations: <br /> EPA=United States Environmental Protection Agency <br /> TPHd=total petroleum hydrocarbons as diesel <br /> TPHg=total petroleum hydrocarbons as gasoline <br /> TPHmo=total petroleum hydrocarbons as motor oil <br /> VOCs=volatile organic compounds <br /> (1)Biogeochemial parameters includes the following:field parameters(oxygen reduction potential,pH,dissolved oxygen,and specific conductance);nitrate,nitrite, <br /> sulfate,and chloride by EPA Method 300.0;manganese by EPA Method 6010B;total organic carbon by SM 5310B;methane,ethane,ethene,and carbon dioxide by EPA <br /> Method RSK-175;total sulfide by SM4500,ferrous iron and alkalinity by SM2320B;and functional gene(i.e.,vcrA,bvcA,and tceA)enumeration by SiREM Lab Gene- <br /> Trac®. <br /> (2)Monitoring well proposed to be installed in 2025.Well sampling will occur 72 hours following well development. <br /> 4 of 4 <br />