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BUILDING 16 FORMER USTS GROUND WATER INVESTIGATION WORK PLAN PORT WEST COMPLEX, ROUGH AND READY ISLAND, PORT OF STOCKTON The grab ground water samples will be analyzed for TPHg by EPA Method 8015, benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 8020, and for methyl tertiary butyl ether (MTBE) confirmed by EPA Method 8260. Due to the number of samples, an on-site mobile laboratory may be used to allow decisions to be made in the field regarding the need for collecting ground water samples in addition to the proposed locations. 3.2.4 Boring Completion Upon completion of all sampling and data collection activities, the borings will be tremie grouted to ground surface using a mixture of neat cement and bentonite clay. The top of the boring will be finished similar to surrounding materials. Each boring will be laterally located by a licensed surveyor relative to on- and off-Site features. 3.2.5 Waste Management Soil material generated from the borings and ground water and wastewater generated from investigation and decontamination activities will be placed in 55-gallon DOT drums, labeled appropriately, and stored on-site for future disposal. Results of soil and ground water sample analyses may be evaluated and appropriate disposal facilities contacted to arrange for transport and disposal of the waste materials. 3.3 TASK 3: GROUND WATER MONITORING Ground water samples will be collected from the monitor wells (MW-1, MW-2, MW-3, MW-4). Prior to collecting ground water samples, the depth to water, thickness of separate phase product (if any), and the depth to the bottom of the well casing, will be measured. Water quality parameters, including pH, dissolved oxygen, and electrical conductivity will be measured in the field. Ground water samples will be collected from the monitor wells using low-flow sampling methods, or a bailer following purging of at least three well volumes. The ground water samples will be placed in a chilled ice chest immediately after collection for transport to the laboratory under chain-of-custody protocols. The ground water samples will be analyzed for TPHg by EPA Method 8015; for benzene, toluene, ethyl benzene and total xylenes by EPA Method 8020; for MTBE by EPA Method 8260B, and for the natural attenuation parameters nitrate (NO3), ferrous iron (Fe+2), sulfate (SO4), methane(CH4), and carbon dioxide(CO2). Environmental Risk Services.Corp.