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i <br /> BCR & Associates, Ltd. Rev 01 12193 <br /> Standard Procedure 3 <br /> Advancing Soil Borings and Soil Sample Collection From Hollow Stem Augers <br /> See Also Soil Classification, Monitoring Well Construction, Site Health and Safety <br /> and Equipment Decontamination <br /> Site Reconnaissance and Notification <br /> Prior to any subsurface construction, the boring locations are "cleared" by <br /> visual inspection, utility service notification, and site personnel authorization <br /> as appropriate. Boreholes are located in accordance with BCR's Health and <br /> Safety Plan. No drilling shall be advanced where overhead or power lines are <br /> a hazard, or where there location is uncertain. At developed urban sites, the <br /> first five feet of each boring is excavated with hand tools, preferably a hand <br /> auger. <br /> Underground Service Alert ("USA") shall be notified where possible, and <br /> appropriate regulatory personnel notified of construction work. In general, <br /> permits are required for monitoring soil boring or advancement or monitoring <br /> well establishment. In circumstances where the boring location varies from <br /> expected, the new location will be noted and identified in subsequent <br /> correspondence with agency personnel. <br /> Soil Borings and Sample Collection <br /> Prior to any subsurface work, the auger flights, drill rod, lead auger or drill bit <br /> and the sampler are decontaminated (BCR SP No. 14). The boring is <br /> advanced with hollow stem, continuous flight augers. Typically, a plug is <br /> utilized in the lead auger to prevent soil coring and blockage. The plug may <br /> operated by drill rod or drill line. <br /> Soil samples are collected at five-foot intervals, at a minimum. Additional <br /> samples are collected at zones of interest including discernable product, <br /> lithology changes, and based on soil moisture. <br /> Samples are collected with a modified California sampler, typically containing <br /> three, two-inch I.D. by six-inch long brass or stainless sample sleeves. The <br /> sampler is attached to either the drill rod (CME equipment, or equivalent) or <br /> down-hole hammer (Mobile Drill). The sampler is advanced by cat-head <br /> activated hammer, with a weight of 140 pounds falling 30 inches. <br />•� Mechanical systems for activating the hammer of equal force are also <br /> utilized. The drill rod or line is marked by the driller at the surface in three, <br />• <br />