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04 February 2004 AGE-NC Project No. 04-1128, Page 6 of 7 Detection limits for soil sample analytes will be as follows: • TPH-d- 2.0 mg/kg • BTEX - 0.005 mg/kg Deviations from these detections limits will be explained in the laboratory analytical report. 4.1.2. GRAB GROUNDWATER SAMPLE COLLECTION If encountered, grab ground water samples will be collected from each boring using a Geoprobe water sampling assembly. For the sampling assembly, probe rods will be fitted with a retractable ground water screen and advanced to the total depth of each probe boring; the rods will then be pulled upward to allow ground water to flow into the screen. A bailer fitting will then be placed on the end of 3/8-inch diameter polyethylene tubing,inserted through the rod assembly into the exposed screen, through which water will be manually pumped. The water samples will be analyzed by a DHS-certified laboratory for the same constituents as the soil samples listed above. Ground water samples will be collected into laboratory supplied containers. Ground water samples for BTEX and TPH-d analyses will be collected into .laboratory-supplied, 40-m1 VOA vials containing 0.5-m1 of hydrochloric acid as preservative and 1-liter amber bottles, respectively. Following collection the samples will be appropriately labeled,placed on ice and kept in a cooler until delivered to the laboratory for analysis. Chain-of-custody protocols will be used to document sample custody transfer from the field to the analytical laboratory. A chain-of-custody form will accompany the samples. Detection limits for ground water sample analytes will be as follows: • TPH-d- 50 gg/1 • BTEX - 0.5 gg/1 Deviations from these detections limits will be explained in the laboratory analytical report. 4.2. EQUIPMENT DECONTAMINATION Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water after being washed with.a, solution of Alconox. All probing rods will be cleaned prior ,to advancement at each probe boring location: Advanced GeoEnvironmental,Inc.