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31 March 2014 AGE Project No. 14-2997 Page 3 of 5 from vertical to collect soil samples under the former UST; and • Two soil borings will be advanced from the southern edge of the current excavation, one vertical soil boring and one angled soil boring at 20 degrees from vertical to collect soil samples under the former UST. Proposed soil boring locations are depicted in Figure 2. 2.3. LABORATORY ANALYSIS Soil samples will be analyzed by a California Department of Public Health (CDPH)- certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as diesel (TPH-d) in accordance with EPA Method 8015 Modified; and • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) in accordance with EPA Method 82608. Laboratory reports for analyses, 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. 3.0. PROCEDURES All field procedures will be overseen by an AGE representative working under the supervision of a California Professional Geologist. Procedures for advancing soil probe borings, collection and analysis of soil samples, equipment decontamination and sample handling are presented below. 3.1. SOIL BORING ADVANCEMENT Soil borings will be advanced using a van-mounted Geoprobe 5400 direct-push or equivalent AMS Powerprobe 9600 probing unit equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings using a hydraulic hammer to drive soil sampling tools to specified depths. 3.2. SOIL SAMPLING Soil samples will be collected from borings at discreet five-foot intervals beginning at fifteen feet bsg using a 1 .45 inch Geoprobe soil sampling assembly loaded with one two-foot long acetate sleeve. Soil samples will be collected to a total depth of 40 feet Advanced GeoEnvironmental Inc.