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24 September 2008 AGE-NC Project No. 08-1636 Page 4 of 5 4.1. SOIL BORING ADVANCEMENT Soil 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 borings using a hydraulic hammer to drive soil sampling and ground water tools to specified depths. 4.2. SOIL SAMPLING COLLECTION AND ANALYSIS The deep soil boring will be sampled at discreet five-foot intervals using a 1.125-inch Geoprobe soil sampling assembly loaded with four six-inch stainless steel sleeves and the remaining soil borings will be sampled from near the surface continually using a 1.5-inch Geoprobe macro-core soil sampling assembly loaded four foot-long acetate sleeves. Upon sample retrieval, the ends of the second sleeve or selected portion of the macro-core acetate sleeve will be covered with Teflon sheets,capped and sealed with tape.Each sample sleeve will be labeled with the boring designation, depth, time, date and sampler's initials.Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a CDPH-certified laboratory for analysis of the chemicals listed in Section 3.2. Soils encountered in the borings will be visually classified by an AGE representative in accordance with the Unified Soil Classification System (USCS). 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)(Thermo Environmental 5 80, l O.OeV[or equivalent] and calibrated to isobutylene). 4.3. GRAB GROUND WATER SAMPLING For the collection of the grab ground water sample,the soil boring will be advanced to the top of the ground water table as identified by collection of a saturated soil sample.Once ground water has been encountered, a Geoprobe push-driven water sampling device will be advanced four feet into the water-bearing zone. The grab ground water samples will be collected using a Geoprobe water sampling assembly fitted with a pre-cleaned,one-inch diameter 0.01-slotted temporary well screen. Each ground water sample will be extracted by using dedicated disposable PVC tubing through the hollow center of the push rods into the screen section. Samples for the analytes listed in Section 3.2. will be collected into appropriate containers (volatile organic analysis [VOA] and 1-liter amber containers). Appropriately sealed and labeled samples will be placed in a chilled container under ice and transported under chain-of-custody procedure to a CDPH-certified laboratory.Each sample container Advanced GeoEnvironmental,Inc.