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17 February 2009 <br /> AGE-NC Project No. 04-1173 <br /> Page 2 of 4 <br /> PRE-FIELD WORK TASKS <br /> A health and safety plan will be prepared in accordance with Occupational Safety and Health <br /> Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety <br /> and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). <br /> Prior to mobilization,the area of excavation will be clearly marked and a utility clearance obtained <br /> through Underground Service Alert. <br /> GEOPROBE SOIL SAMPLER ADVANCEMENT <br /> Prior to advancement, the concrete will be cored or cut at each proposed sample location to allow <br /> access to the native material beneath the dispensers. After coring, a 1.5-inch Geoprobe® soil <br /> sampling assembly will be attached to 1.25-inch probing rods and hand-driven at a pre-determined <br /> angle through gravel until native material is reached approximately directly beneath each diesel <br /> dispenser island. <br /> It is anticipated that an approximate 41 degree angle will be required to safely advance the sampler <br /> assembly beneath diesel dispenser numbers 10 through 15 and 17 to a depth of approximately 3.5 <br /> feet below surface grade (bsg) (Figure 4) and an approximate 17 degree angle for diesel dispenser <br /> number 16 to a depth of approximately 3.6 feet bsg(Figure 5). The angle will be determined using <br /> an inclinometer. <br /> Upon reaching native soil,the probing rods and sampler assembly will be hammered by hand with <br /> a sledge hammer to the target depth. <br /> SOIL SAMPLING COLLECTION AND ANALYSIS <br /> One soil sample will be collected from each sample location B-10 through B-15 and B-17 at a depth <br /> of approximately 3.5 feet bsg. The sample collected from location B-16 will be collected from <br /> approximately 3.6 feet bsg. Samples will be collected using a 1.5-inch Geoprobe® soil sampling <br /> assembly loaded with four six-inch stainless steel sleeves.Upon sample retrieval,the ends of the full <br /> soil sleeve will be covered with Teflon sheets, capped and sealed with tape. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice and <br /> transported under chain-of-custody procedure to a California Department of Public Health-certified <br /> laboratory. Each sample will be analyzed for the following: 9q,;' <br /> • Total petroleum hydrocarbons quantified as diesel by EPA Method 8015 Modified. <br /> Advanced GeoEnvironmental,Inc. <br />