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02 November 1999 AGE-NC Project No. 99-0628 Page 4 of 8 analyzed by a McCampbell Analytical, Inc. (MAI), a DHS-certified laboratory, for the following: • Total petroleum hydrocarbons quantified as gasoline(TPH-g), diesel (TPH-d) and motor oil (TPH-mo) in accordance with EPA Methods 8015 Modified/5030; • Benzene,toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method 8020; • Volatile organic compounds (VOCs) in accordance with EPA Method 8260, • Semi-volatile organic compounds (SVOCs) in accordance with EPA Method 8270; and • RCRA 8 Metals (arsenic, barium, cadmium, chromium, lead, mercury. selenium and silver in accordance with appropriate EPA 6010 and 7000 series. Laboratory analytical results of dry well and discharge line samples are discussed in Section 5.2.; laboratory analytical results of stockpiled soil samples are discussed in Section 5.3. 5.0. FINDINGS Field observations and laboratory results of dry well, discharge line and stockpiled soil sampling are discussed below. 5.1. DRY WELL EXCAVATION AND BACKFILLING Soil removed from the dry wells consisted primarily of cobbles and gravel with sand. Slight to strong hydrocarbon odors were noted in each dry well from depths of approximately 5 feet bsg to 25 feet bsg. Detected organic vapor concentrations ranged from 8.1 parts per million(ppm) in a sample from DW-2 at 20 feet bsg to 470 ppm in a sample from DW-1 at 18 feet bsg. Organic Vapor was not detected in the duplicate soil sample collected from boring B 1. Native soil was encountered in each dry well at a depth of approximately 25 feet bsg. Approximately 6.5 cubic yards of cement were used to backfill each dry well. The upper two feet of each dry well was left exposed and will be backfilled with clean fill material at a later date. 5.2. ANALYTICAL RESULTS OF DRY WELL AND DISCHARGE LINE SAMPLES One soil sample was analyzed from each dry well; one soil sample was analyzed from beneath the discharge line (boring B 1). Soil sample locations are illustrated on Figure 2. A summary of dry well Advanced GeoEnvironmental,Inc.