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<br />aecom.com <br />Our Reference 60632236 <br />4/10 <br />The remaining portion of each boring (i.e., between 5 and 10 feet bgs) will be completed using a direct- <br />push auger after soil vapor samples have been collected and all well construction material has been <br />removed from the boring. <br />Soil Sampling Procedures <br />Soil samples will be collected in approximately 6-inch sections from each boring. Sample containers will <br />be labeled with the sample name, location, depth, date, and time of collection; analysis requested; and the <br />sampler's initials. All sample names will follow the naming convention: <br />B#-SO-X-Y-Z, where: <br />B# = location (B1 to B4), <br />SO = matrix (soil), <br />X = sample collection depth, <br />Y = sample collection month, and <br />Z = sample collection calendar day. <br />Between 0 and 5 feet bgs, soil samples will be collected directly from the hand-auger bucket into a <br />laboratory-supplied 8-ounce glass jar. Each sample will be screened using a photo-ionization detector <br />(PID), and the reading will be recorded on the boring logs. <br />Between 5 and 10 feet bgs, soil samples will be collected from the direct-push auger by cutting an <br />approximately 6-inch section of the acetate liner. Each sample will be screened using a PID, and the <br />reading will be recorded, before the acetate liner is capped at each end with Teflon tape and plastic end <br />caps and placed into a labeled re-sealable plastic bag. <br />Four soil samples from each boring will be selected for laboratory analysis (i.e., the two samples from 0 to <br />5 feet bgs with the highest recorded PID readings and the two samples from 5 to 10 feet bgs with the <br />highest recorded PID readings). The containers of the selected samples will be opened, and sample <br />media will be collected using the Terracore sampler before the jar or acetate liner is resealed. <br />Samples will be placed in an insulated cooler with ice for transport under chain-of-custody to Eurofins <br />TestAmerica, a State of California-certified analytical laboratory in West Sacramento, California. Soil <br />samples will be analyzed for total petroleum hydrocarbons (TPH) as gasoline (TPH-g) and benzene, <br />toluene, ethylbenzene, xylenes [BTEX] and naphthalene by Environmental Protection Agency (EPA) <br />Method SW8260B and TPH as diesel (TPH-d) by EPA Method SW8015B, as per Table 1 below. All <br />samples will be analyzed on a standard 10-day turnaround.