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Ms. Devra Lewis <br /> February 20, 2003 <br /> Page 3 of 6 <br /> prior to sampling(one to three times the volumes of the screen interval). Field meters <br /> will be used to monitor the pH, conductivity, temperature, dissolved oxygen, <br /> turbidity, and oxidation-reduction potential(ORP) two to four times during purging. <br /> 7) Collect samples in accordance with SOP 230, Groundwater Sampling, as applicable <br /> for direct push methodology water sampling. Samples to be analyzed for volatile <br /> constituents (e.g., TPHg and BTEX) will be collected fust and not filtered. Samples <br /> to be analyzed for heavier hydrocarbons (TPHd) may be filtered prior to analysis <br /> through a 0.45-micron filter, if turbidity exceeds 10 nephelometric turbidity units <br /> (NTUs) <br /> 8) Remove the rod and sample assembly and backfill the borehole with bentonite chips. <br /> All soil cuttings will be containerized for appropriate disposition <br /> 9) Decontaminate the sampling equipment as described in SOP 120,Decontamination. <br /> Groundwater Analytical Test Methods <br /> Groundwater samples will be analyzed for petroleum hydrocarbons by EPA Method 8260B and <br /> modified EPA Method 8015. Specific constituents to be reported include the following: <br /> • Total purgeable petroleum hydrocarbons (TPPH), which indicates concentrations of <br /> gasoline-range hydrocarbons <br /> • Total extractable petroleum hydrocarbons (TEPH), which indicates concentrations of <br /> diesel-range hydrocarbons <br /> • Benzene,toluene, ethylbenzene and xylenes(BTEX) <br /> • Methyl t-butyl ether(MTBE) <br /> • Diisopropyl ether (DIPE) <br /> • Ethyl t-butyl ether (ETBE) <br /> • Tert-amyl methyl ether(TAME) <br /> • Tert-butanol(TBA) <br /> • Ethanol <br /> • Methanol. <br /> Samples will be analyzed under standard turnaround times. <br />