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17 June 2003 <br /> AGE-NC Project No. 03-1043 <br /> Page 5 of 6 <br /> 4.1. PROBE BORING ADVANCEMENT <br /> The probe borings will be advanced using a van-mounted Geoprobe 5400 direct-push probing unit <br /> equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings using a hydraulic <br /> hammer to drive soil sampling tools to specified depths. <br /> 4.2. SOIL SAMPLING COLLECTION AND ANALYSIS <br /> The soil borings will be sampled at discreet five-foot intervals using a 1.125" Geoprobe soil <br /> sampling assembly loaded with four six-inch brass sleeves. Upon sample retrieval, the ends of the <br /> second sleeve will be covered with Teflon sheets,capped and sealed with tape. Then the sleeve will <br /> be labeled with the boring designation, depth, time, date and sampler's initials, and placed in a <br /> chilled container under ice, to be transported under chain-of-custody procedure to a DHS-certified <br /> laboratory. <br /> Soil in the remaining brass sleeves will be visually classified by an AGE geologist in accordance <br /> with the Unified Soil Classification System(USCS).Additionally,the soil will be field-screened for <br /> the presence of volatile organic compounds using an organic vapor meter(OVM), equipped with <br /> photo-ionization detector(PID). <br /> 4.3. GRAB GROUND WATER SAMPLING PROCEDURES <br /> To collect grab ground water samples, each soil boring will be advanced to the top of the ground <br /> water table, as identified by collection of a saturated soil sample. Once ground water has been <br /> encountered, a hydropunch-equivalent water sampling device will be driven two to three feet into <br /> the water bearing zone. Ground water samples will be collected from the hydropunch-equivalent <br /> water sampling assembly fitted with one-inch diameter 0.010-inch slotted temporary well screen. <br /> Each ground water sample will be extracted by lowering a bailer through the hollow center of the <br /> drive rods into the screen section. However, based on subsurface conditions encountered during <br /> drilling,grab ground water samples maybe collected directly through the hollow stem augers using <br /> a disposable bailer. <br /> 4.4. 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 />