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07 February 2006 <br /> AGE-NC Project No. 97-0360 <br /> Page 6 of 7 <br /> 4.1.1. Soil Sampling Procedures <br /> Soil borings will be sampled at discrete five-foot intervals using a 1.5" Geoprobe soil sampling <br /> assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of the second or <br /> other selected sleeve will be covered with Teflon sheets, capped and sealed with tape. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain of custody procedure to a DI IS-certified laboratory.Each sample sleeve will <br /> be labeled with the boring designation,depth,time, date and sampler's initials. Soils encountered in <br /> the borings will be visually classified by an AGE geologist in accordance with the Unified Soil <br /> Classification System(USCS). Additionally, soil samples will be field-screened for the presence of <br /> volatile organic compounds using an organic vapor meter(OVM), equipped with photo-ionization <br /> detector (PID). <br /> 4.1.2. In-Situ Ground Water Sampling Procedures <br /> For the collection of grab ground water samples, soil probe borings will be advanced to the top of <br /> the ground water table as identified by collection of a saturated soil sample. Once ground water has <br /> been encountered,a Geoprobe push-driven water sampling device will be advanced two to three feet <br /> into the water-bearing zone. Grab ground water samples will be collected using a Geoprobe water <br /> sampling assembly fitted with a pre-cleaned,one-inch diameter 0.010-slotted-temporary well screen. <br /> Each ground water sample will be extracted by lowering a polyethylene bailer through the hollow <br /> center of the push rods into the screen section. Samples for BTEX will be collected into laboratory <br /> supplied, 40-m1 volatile organic analysis (VOA) vials containing 0.5-m1 of hydrochloric acid as <br /> sample preservative. Samples for TPH-d analysis will be collected into laboratory-supplied, 1 liter <br /> amber bottles without sample preservative. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain of custody procedure to a DHS-certified laboratory. Each sample container <br /> will be labeled with the boring designation, time, date and sampler's initials. <br /> 4.2. EQUIPMENT DECONTAMINATION <br /> Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <br /> Advanced GeoEnvironmental,Inc. <br />