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16 <br /> approximately 50 grams of soil were collected from each sampling interval, placed in a <br /> resealable plastic bag, and screened in the field for volatile organic compounds (VOCs) using <br /> i <br /> a PID. PID boring readings are recorded on the <br /> g g to s. <br /> g <br /> No PID readings above background levels were noted at;any of the borings. As noted on the <br /> k boring tog for SB-02, stained soil was noted in soil from approximately 3.5 to 4.0 feet bgs. <br />' 4.2 Soil Sample Collection and Analysis N <br /> I Continuous soil cores were collected from each soil boring usig Precision Sampling, Inc.'s <br /> patented Enviro-Core dual-tube, direct-push sampling system:' The Enviro-Core system <br /> ;r <br /> consists of a small-diameter drive casing and an inner sample barrel that are simultaneously <br /> pushed, pounded, or vibrated into the ground. Soil cores are collected in stainless-steel <br /> i <br /> liners inside the sample barrel. After being advanced three feet., the full sample barrel is <br /> 5 <br /> retrieved while the drive casing is left in place to prevent the probe hole from collapsing. <br /> The drive casing ensures that subsequent soil samples are collected from the targeted <br /> r <br /> interval, rather than from slough higher in the probe hole. Soil.samples for potential <br /> E laboratory analysis were collected at approximate three- to fivepfoot intervals beginning at <br /> I !� <br /> two to five feet bgs and extending to the total borehole depth. `Following sample collection, <br /> the stainless-steel sleeve containing the soil sample for laboratory analysis was immediately <br /> withdrawn from the sampler and sealed with Teflon® sheets and tight-fitting, plastic end � <br /> caps. The soil samples were then labeled with a unique sample' number, date time of <br /> P P q p , <br /> collection, initials of collector, and Terranext project number. Each soil sample was then <br /> placed in an insulated chest containing ice and delivered �(along�with chain-of-custody <br /> documentation) to Quanterra Environmental Services (Quanterra), located in West <br /> Sacramento, California for analysis. <br /> i� <br /> 808-001.rpr104-29-97/u/keydaa/repores 4 i <br /> !i <br /> i <br /> • - I. -. -_ti.. <br />