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I <br /> Ms Lori Duncan Project 880-039 1A <br /> March 13, 2002 <br /> Page 4 <br /> top of the screen for the well A 2 foot bentonite transition seal will be placed atop the <br /> sand pack, and a Portland cement seal will extend from the bentonite transition seal to the <br /> ground surface The Portland cement seal will be emplaced by tremie pipe or through the <br /> center of the hollow-stem augers in one continuous operation from the bottom of the <br /> interval to be filled to the top <br /> Soil Sampling <br /> A minimum of three soil samples from each boring will be submitted to the laboratory for <br /> the analysis of, TPHg by modified EPA Method 8015, benzene, toluene, ethylbenzene, <br /> total xylenes (BTEX) and di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), <br /> MtBE, tertiary amyl methyl ether (TAME), and tertiary butyl alcohol (TBA), collectively <br /> the `five oxygenates', by EPA Method 8260B Soil samples will be selected based on the <br /> highest photo-ionization detector (PID) readings, soil water interface and from the bottom <br /> of the boring <br /> Well Development <br /> The groundwater monitoring wells will be developed after completion The development <br /> procedure for each well will consist of pumping or bailing water from the well until the <br /> water is visibly clear, the well goes dry, or until a maximum of ten casing volumes have <br /> been removed <br /> Groundwater Analysis <br /> Following monitoring well development, groundwater samples will be collected and <br /> submitted to a California State-certified laboratory for analysis Groundwater samples <br /> will be analyzed for the presence of TPH-g, BTEX, and for five oxygenates (MtBE, DIPS, <br /> ETBE, TAME and TBA) using EPA Methods 8015 Modified, 8020 and 826013, <br /> respectively <br /> !T CORPORA TlQN <br /> SAC 111SACRFPIICOMMONIsacDP120021PRJ\PJ81880\8800391A 2ab doc <br /> (01020000) <br />