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12 May 1998 AGE-NC Project No. 98-0451 Page 2 of 3 3.2. EQUIPMENT DECONTAMINATION All Geoprobe sampling tools and sample liners used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox. Geoprobe rods which come into contact with impacted soil will be cleaned between borings. 3.3. LABORATORY ANALYSIS Samples will be transported, under chain-of-custody, in a chilled container, to a state-certified laboratory for analysis. Selected samples will be analyzed for: • TPH-g, TPH-d and TPH-mo in accordance with EPA Method 5030/8015m. • Volatile aromatics (benzene, toluene, ethylbenzene and xylenes: BTE&X) with methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 80201602. • oxygenated compounds in accordance with EPA Method 8260. The laboratory report,testing methods, laboratory quality assurance/quality control (QA/QC)reports and sample chain-of-custody documentation will be presented in a report with the findings and recommendations. 4.0. PROCEDURES 4.1. SOIL PROBE BORING INSTALLATION AND SAMPLING The following procedures will be performed for the installation of probe boring: 1. Notify the PHS-EHD at least 48 hours prior to commencement of any work. 2. Advance one soil probe boring at the site to a depth of approximately 25 feet below surface grade(bsg) using a van-mounted Geoprobe probing unit equipped with 1.25-inch diameter rods. If hydrocarbons are encountered based on field observations, the probing will be advanced below the impacted soil interval to the extent practicable. The proposed probe boring location is depicted on Figure 2. 3. Decontaminate sampling equipment in an Alconox solution and rinse with water prior_ to each sampling run. 4. Obtain soil samples at 5-foot depth intervals during probing installation. Samples will be collected using a Geoprobe soil sampling assembly pre-loaded with four 1.125-inch by 6- Advanced GeoEnvironmental,Inc.