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r T `"� Ms. Vicky McCartney <br /> Page 3 of 4 <br /> Drilling and Discrete Soil and Groundwater Sampling <br /> Drilling will be conducted under the supervision of an experienced geologist. A C-57 licensed <br /> drilling contractor will advance the soil borings using a Geoprobe rig. Soil will be classified in <br /> accordance with ASTM Designation D2488-90, which is equivalent to the Unified Soil <br /> Classification System. A flame ionization detector (FID) will be used to screen all soil samples for <br /> evidence of hydrocarbon contamination. Soil and groundwater samples will be collected from the <br /> borings for laboratory analysis. <br /> Direct Push Drilling <br /> A total of seven soil borings will be advanced at the approximate locations shown on Figure 2 using a <br /> truck mounted Geoprobe rig. Six of the borings will be drilled to depths of approximately 40 feet bgs. <br /> The seventh boring, near the location of the former fuel dispenser, will be drilled to a depth of <br /> approximately 10 feet. Upon completion, the soil borings will be backfilled with neat cement grout to <br /> ground surface. <br /> Soil samples will be collected from the borings at five-foot intervals to their respective total depths for <br /> lithologic identification and field screening for contamination. Selected soil samples will be submitted, <br /> to a State-certified laboratory for analysis. Soil sample selection will be based on field evidence of <br /> petroleum hydrocarbon contamination such as discoloration, odors, FID readings, as well as <br /> lithologic changes. If no evidence of contamination is noted in the field, samples from the capillary <br /> fringe will be submitted for chemical analysis along with a second sample to be selected based on <br /> lithology. Samples selected for analysis will be immediately capped, segregated and preserved by <br /> placing in an ice chest at a temperature of approximately 4°C, and transported to the laboratory <br /> under chain of custody protocol. <br /> One discrete groundwater sample.will be collected from each of the six deeper borings. The samples <br /> will be collected using a discrete sampling device (HydropunchO or equivalent) driven into the water <br /> bearing zone. After driving the sampling device to the appropriate depth, the drill rods will be <br /> retracted exposing the sampler screen. Water will be retrieved with a length of polytetrafluorethylene <br /> (PTFE) tubing equipped with a stainless steel bottom check valve. In the event that the sampler screen <br /> clogs or for other reasons groundwater will not enter the device in suitable quantity, a grab sample <br /> will be collected through the rods using a disposable bailer. Water samples will be placed in <br /> appropriate containers, labeled and chilled as described above. <br /> All sampling and drilling equipment will be washed thoroughly with laboratory-grade detergent and <br /> water between uses to minimize the potential for cross contamination. Wastewater generated <br /> during fieldwork will be contained in labeled DOT approved drums pursuant to 49 CFR part 1.72 <br /> and 40 CFR part 262, pending laboratory results and the development of disposal options. <br /> Laboratory Analysis <br /> Soil samples selected for analysis will\°submitted under chain of custody protocol to a State-certified <br /> laboratory. The samples will be analyzed for TPHg using EPA Method 89and BTEX using EPA <br /> Method 8021. 15' <br /> 11GZA_FSIVOL_11DATAIGROUNDZEIW-EIREPORTSIhydpuW KPLAN.doc <br />