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7� 25 March 1998 AGE-NC Project No. 98-0426 Page 2 of 3 Probings will be advanced at the former USTs location and at each dispenser island location. If a probe boring encounters intensely impacted soil, subsequent probing locations will be stepped out to define the plume. The proposed probing locations are illustrated on Figure 2. Grab water samples will be collected from selected probings. Samples will be collected using a Geoprobe water sampling assembly and placed in 40-m1 VOA vials containing 0.5-m1 of hydrochloric acid as a preservative. 3.2. EQUIPMENT DECONTAMINATION All Geoprobe sampling tools and sample liners used for sample collection will be thoroughly and doubly rinsed with clean water after washing with a solution of Alconox. Geoprobe rods, which come into contact with sampled soil, will be cleaned between borings. 3.3. LABORATORY ANALYSIS Selected soil and grab water 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 and volatile aromatics (benzene, toluene, ethylbenzene and xylenes: BTE&X) in accordance with EPA methods 8015m/5030 and 80201602, respectively. 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 borings: I. Notify the PHS-EHD at least 48 hours prior to commencement of any work. 2. Advance three soil probe borings at the site to depths of approximately 35 feet below surface grade (bsg) using a van-mounted Geoprobe probing unit equipped with 1.25-inch diameter rods. Probings will be advanced at the former USTs location and each dispenser island location. If hydrocarbons are encountered based on field observations, probings will be advanced below the impacted soil interval to the extent practicable. The proposed probe boring locations are depicted on Figure 2. 3. Decontaminate sampling equipment in an Alconox solution and rinse with water prior to AdrancedGcoEnvironmental,Inc.