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M 02 January 2009 AGE-NC Project No . 99-0682 Page 4 of 7 I I 3 . 1 , DRILLING Soil borings will be advanced utilizing a truck-mounted, hollow-stem drill rig and 8-inch diameter hollow-stem augers. Cuttings and rinseate generated during drilling activities will be containerized in properly labeled DOT-approved 55-gallon drums, and stored in an area lacking public access . Disposal alternatives will be evaluated based on results of soil and water analysis. 3 :2. SOIL AND GRAB GROUNDWATER SAMPLING Soil samples will be collected from each boring at five-foot intervals, beginning at a depth of 50 feet bsg, utilizing a California split-spoon sampler and brass sleeves. The sampler will be driven by dropping a 140-pound weight from a height of 30 inches . The number of blows it takes to collect samples will be recorded on boring logs. Upon soil sample retrieval, the middle brass sleeve will be removed from the sampler. Ends of the brass sleeve will be immediately covered with Teflon sheets, sealed with plastic end caps, secured with tape and immediately placed in a chilled container for transportation under chain of custody to a CDPH-certified laboratory. Each sample sleeve will be labeled with the boring location, sample depth, sample time, date and sampler's initials. During sampling activities, soil sample duplicates will be monitored for the presence of organic vapor using a photo-ionization detector (PID : Thermo Environmental 580, 10.0 eV, calibrated to isobutylene) and will be visually described on boring logs using the Unified Soil Classification System (USCS). One grab ground water sample will be collected from proposed soil borings B7 and 138 at a depth of approximately 70 feet bsg utilizing a Hydro-Punch water sampling assembly. For the sampling assembly, a stainless-steel probe rod will be fitted with a retractable ground water screen and advanced to the total depth of each boring; upon reaching total depth, rods will be pushed another five feet beneath the bottom of the bore-hole into saturated soil and pulled upward to allow ground water to flow into the screen. A disposable bailer will used to inserted through the rod assembly into the exposed screen, through which water will be manually collected. II Grab ground water samples will be transferred to the following containers: three 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials without sample preservative and to one 1 -liter amber bottle without preservative. Care will be taken to ensure that visible air bubbles were not present in the vials after filling and capping. Groundwater sample containers will be labeled with boring designation, date, time, and sampler's initials. SII Advanced GeoEnvironmental, Inc. , III i