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United States Postal Se*e • Delta Carrier Annex <br /> Subsurface Exploration <br /> Our field engineer or scientist will supervise, log, and sample eight exploratory borings to <br /> evaluate soil quality. Boring locations will be selected based on fild observations; <br /> however, the borings will be spread across the site. The borings will be advanced to a <br /> depth of approximately 15 feet. <br /> The subsurface investigations will be performed using a truck mounted rig equipped with <br /> Direct Push Technology equipment. The borings will be advanced by hydraulically <br /> driving a 1-inch-diameter by 22-inch closed piston sampler designed to allow the interior <br /> clear acetate sample liner to remain completely sealed while driven to depth. When at <br /> the specified depth, the piston tip will be released and the samplei advanced to collect <br /> the soil sample within the liner and then retracted to the surface. Upon completion, the <br /> borings will be grouted with a bentonite chip and a cement slurry. <br /> The soils sampled will be logged using the Unified Soil Classification System (ASTM D- <br /> 2487). Soil samples for laboratory analysis will be collected in acetate liners. The ends of <br /> the liners will be covered in aluminum foil or Teflon film, fitted with plastic end caps, <br /> taped, and labeled with a unique identification number. The samples then will be placed <br /> in an ice-chilled cooler and transported to a state-certified analytical laboratory with chain <br /> of custody documentation. <br /> Ground Water Sampling <br /> If ground water is encountered, after the borings are completed, 3/4-inch, I.D. flush- <br /> threaded, PVC casing will be lowered into the bore holes. The lower portion of the <br /> casing will have factory machined slots to allow for the infiltration of ground water. <br /> Ground water will be collected using a small diameter bailer and placed in appropriate <br /> sample bottles labeled with a unique identification number. The samples then will be <br /> placed in an ice-chilled cooler and transported to a state-certified -analytical laboratory <br /> with chain of custody documentation. <br /> Laboratory Analyses <br /> Two soil samples from each boring and four ground water sample3, if encountered, will <br /> be analyzed at a state certified laboratory for a fuel fingerprint sea (EPA Test Method <br /> 8015M/8020) and halogenated volatile organic compounds (VOCs (EPA Test Method <br /> 8010). All analyses will be performed on a standard one-week laboratory response time. <br /> LOWNEVASSOCIATES Page 2 <br /> Envimnmental/Geafechnkal/Engineering Services PXXX <br />