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4.1 Soil Sampling <br /> Soil samples *Trill. be collected .from borings, S-1 through B-4, by <br /> driving a sampler containing vinyl acetate tubing using a power <br /> probe. Soil samples will be collected at 5-foot inter�rais starting <br /> at a depth of approximately 5 feet bgs and extend to a depth of <br /> approximately 25 feet bgs- Additionally, soil samples will be <br /> collected at lithalogic changes and at areas of �ioil contamination, <br /> The soil samples will be screened using a portable photoionization <br /> detector. <br /> The soil samples will be stored, in a chilled cooler containing <br /> crashed ice for delivery to the laboratory. Strict chain-of- <br /> custody protocols will be followed in all phases of sannple <br /> handling. All equipment used during this investigation which <br /> comes into contact with affected material will be thoroughly, <br /> decontaminated before and after each Vise. This will be <br /> accorrtp 3,i shed by washing with Xlcono.% fa laboratory-grade <br /> detergent) and rinsing with d.eioni.zed, distilled, or fresh water_ <br /> The boreholes will be backfilled with neat cement grout upon <br /> completion of the soil sampling activities. The neat cement will <br /> be tremied from the bottom of the borehole to the top of the <br /> borehole. <br /> 4 .2 Soil Vapor Sampling <br /> Soil gas samples Evill b� c.olleQcted from borings, SV--1 through SV--4 , <br /> within the vadose zone by driving a soil vapor sampler into the <br /> ground using a power probe. Once . inserted to the dQsired depth, <br /> the probe will be retracted slightly, which opens the tip and <br /> exposes the vapor sampling ports. Soil vapor will be withdrawri <br /> from the 1/8 inch nylaflow tubing, located down the center of the <br /> probe, using a- small calibrated syringe connected via an on-off <br /> valve. The first 5 dead volumes of gas will be discarded to flush <br /> the sample tubing and fill it with in-situ soil vapor. The next 20 <br /> cc of soil vapor will be withdrawn ,in the syringe, plugged, and <br /> immediately transferred to the mobile lab. fot analysis . <br /> All equipment used during this investigation which comes into <br /> contact With affected material will be thoroughly decontaminated <br /> before and after each use. This will be -accomplished by washing <br /> with Alconox (a laboratdry-grade detergent) and rinsing with <br /> deionized, distilled, or fresh tater . <br /> 4 <br />