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15 April 2008 AGE-NC Project No. 11-1900 Page 3 of 4 As the deep borings are advanced, soil samples will be collected at 5-foot intervals beginning at 5 feet bsg and extending to the total depth of the probe boring. Shallow borings will have soil samples collected from one-foot bsg to five feet bsg. The proposed probe boring locations are illustrated in Figure 1. Probe borings will be advanced using a van-mounted Geoprobe 5400 direct-push 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. Soil borings will be sampled at discreet five-foot intervals using a 1.125-inch Geoprobe soil sampling assembly loaded with four six-inch steel sleeves or macro core sampling tool. Upon sample retrieval, the ends of the second sleeve will be covered with Teflon sheets, capped and sealed with tape. Based on the amount of sample recovery, either of the leading sample sleeves will be preserved for possible laboratory analysis by covering the exposed ends of the sleeve with Teflon sheets and plastic end caps, and sealing with tape. Soil encountered in the borings will be visually classified by an AGE personnel in accordance with the Unified Soil Classification System.Additionally, soil samples will be field-screened for the presence of volatile organic compounds using an organic vapor meter (OVM), equipped with photo-ionization detector(PID) and potentially an flame-ionization detector (FID). Following sample collection, each preserved sample sleeve will be labeled with the boring location, depth, time, date, and sampler's initials. Appropriately sealed and labeled samples will be placed in a chilled container, under ice, and will be transported under chain-of-custody procedure to a State of California Department of Public Health (CDPH)-certified laboratory. Selected soil samples from each probe boring may be submitted for laboratory analysis. Up to sixteen soil samples from the initial boring will be selected for laboratory analysis. Soil samples for laboratory analysis will be selected based on visual observations of petroleum hydrocarbon impact,organic vapor meter(OVM)readings, changes in lithology, and/or at the capillary fringe. Select soil samples will be analyzed by a State of California Department of Public Health (CDPH)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline and diesel and oil (TPH-g/TPH-d/TPH-o) in accordance with EPA Method 8015 Modified and • Volatile organic compounds (VOCs) including in accordance with EPA Method 82608. • Lead or CAM 17 Metals in accordance with EPA Method 6010B. Laboratory reports for ground water analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain-of-custody documentation will be presented in a report with findings and recommendations.