Laserfiche WebLink
s • <br /> • <br /> The augers and sampling equipment will be steam cleaned prior to <br /> the drilling of each soil boring and the sampling equipment washed <br /> with a TSP solution between each sampling interval. <br /> During the drilling operations, the geologist will maintain a log <br /> of the materials encountered. Soil samples will be field screened <br /> for the presence of total volatile organic (TVO) vapors using a <br /> handheld PID equipped with a 10. 2 EV lamp. The PID will be <br /> calibrated daily with a bottled standard supplied by the <br /> manufacturer of the PID that simulates 54 ppm benzene. <br /> Preservation of Soil Samples <br /> After field screening, the sample sleeve ends will be sealed with <br /> aluminum foil and further protected with plastic caps. The samples <br /> will be labeled with IDO, location, depth, date, time, sampler's <br /> .initials and analyses to be performed. Then the sample will be <br /> placed in an ice chest at 4 degrees C and delivered with <br /> accompanying chain of custody documentation to a California State <br /> certified analytical laboratory. <br /> Selection and Certified Laboratory Analyses of Soil Samples <br /> • v Four soil samples from each soil boring will be selected for <br /> certified laboratory analysis. Selected soil samples will be <br /> analyzed by a certified laboratory for concentrations of Total <br /> Petroleum Hydrocarbons as Gasoline (TPH-G) using EPA method 5030 <br /> and Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA <br /> method 8020. <br /> Destruction of Confirmation Soil Borings <br /> The five soil borings will be destroyed by the drilling contractor <br /> on the same day they are drilled. The borings will be backfilled <br /> from total depth to within two feet of the surface with <5% <br /> bentonite neat cement. The surface portion of the hole will be <br /> plugged with quick setting concrete and leveled to grade. <br /> TASK VI. PRELIMINARY INVESTIGATION AND EVALUATION REPORT <br /> Upon receipt of all field notes and laboratory reports, RAH will <br /> prepare a Preliminary Investigation and Evaluation Report. The <br /> report will follow the "Tri-Regional Board Staff Recommendations <br /> for Preliminary Investigation and Evaluation of Underground Tank <br /> Sites, Appendix All and will document the procedures used to <br /> collect and analyze the data including any deviations from the <br /> • final work plan. <br /> 3 <br />