Laserfiche WebLink
• Drilling and Soil Sample Collection <br /> The soil boring will be drilled by a licensed drilling contractor <br /> using a mobile rig equipped with 8 inch diameter hollow stem <br /> augers. The boring will be drilled to approximately 20 feet, <br /> Representative soil samples will be collected at a minimum of 5 <br /> foot intervals in 2" X 6" brass sleeves with the aid of a 140 lb. <br /> slide hammer and split spoon sampler. A new and clean disposable <br /> bailer will be used to collect a water sample from the inside of <br /> the augers, at the first occurrence of ground water. <br /> The augers and sampling equipment will be steam cleaned prior to <br /> the drilling of the 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 ID#, location, depth, date, time, samplerfs <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 /> The soil samples from the 10, 15 and 20 feet below the surface <br /> will be selected for certified laboratory analysis. The selected <br /> soil samples and the water sample will be analyzed by a certified <br /> laboratory for concentrations of Total Petroleum Hydrocarbons as <br /> Gasoline (TPH-G) using EPA method 8015mod and Benzene, Toluene, <br /> Ethylbenzene, and Xylenes (BTEX) using EPA method 8020. <br /> Destruction of Confirmation Soil Boring <br /> The soil boring will be destroyed by the drilling contractor <br /> on the same day they are drilled. The boring will be backfilled <br /> from total depth to within two feet of the surface with <50 <br /> bentonite neat cement. The surface portion of the hole will be <br /> plugged with quick setting concrete and leveled to grade. <br />• 2 <br />