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CW <br /> i <br /> Mr.M. Scott Mansholt-Ch�'�ron Environmental Management Corporation Page 4 <br /> Pombo Property-Soil and Groundwater Investigation Work Plan July 31,2003 <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX, EPA Method 8021B); <br /> • Total petroleum hydrocarbons quantified as crude (TPHc, EPA Method 8015 <br /> modified); and <br /> • Polynuclear aromatic hydrocarbons (PNAs, EPA Method 8270C Select Ion <br /> Monitoring [SIM]). <br /> Task 2—Groundwater Sampling <br /> Grab groundwater samples will be collected in each boring where water is present in <br /> sufficient volume to fill containers. No grab groundwater sample will be collected from a <br /> boring where petroleum impacted soil was encountered in the soil core or if a sheen is <br /> visible on the water surface. The groundwater samples will be collected using either <br /> disposable polyethylene or decontaminated, reusable stainless steel bailers. The grab <br /> groundwater samples will be submitted to Friedman & Bruya under SAIC chain of <br /> custody protocol, for the following chemical analyses: <br /> • BTEX (EPA Method 8021B); <br /> • Total petroleum hydrocarbons quantified as diesel (TPHd, EPA Method 8015 <br /> modified); and <br /> • PNAs (EPA Method 8270C [SIM]). <br /> Between borings, the sampling tubes and any other non-dedicated sampling equipment <br /> will be decontaminated to prevent the possibility of cross contamination of soils or <br /> groundwater. <br /> Excess soil from the soil borings and decontamination fluids will be drummed on site and <br /> will be properly disposed of by ChevronTexaco in accordance with California State and <br /> Federal regulations. <br /> Open boreholes will be abandoned at the conclusion of sampling. Under the supervision <br /> of a San Joaquin Environmental Health District(SJEHD) inspector, SAIC field teams <br /> will use a tremie pipe to place cement grout from the total depth of the boring to within <br /> 12 inches of the ground surface. The remaining interval will be backfilled with structural <br /> material sufficient to support an asphalt patch. All borehole locations will be recorded <br /> with a global positioning system (GPS) unit. <br /> Task 3 —Reporting <br /> A letter report will be provided to ChevronTexaco to document the results of the soil <br /> sampling and analyses. The report will be delivered within 30 days of SAIC's receipt of <br /> the analytical data. The letter report will include: <br /> i <br />