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Mr. Ron Rowe C A M B R I A December 18, 1998 levels, on observations of staining and odor, and on the results of field screening with a portable vapor analyzer. Our standard sampling protocol is described in Attachment A. At a minimum, three soil samples from each of the well`borings will be analyzed: one each from the historically lowest ground water level (35 feet bgs), the highest ground water level (5 feet bgs), and the capillary fringe(expected to be approximately 20 feet bgs). One soil sample from each distinct lithologic unit across the site that has not been previously encountered will be preserved for physical analyses. For each sample that will be used for physical analyses, Cambria will attempt to preserve two brass tubes, each 6 inches in length by 2 inches in diameter. Soil observed to contain hydrocarbons will not be used for physical analyses. Ground Water Sampling: For each of the CPT borings, Cambria will collect discrete ground water samples at five ft intervals at and below the water table using either a Hydropunch® sampler for water samples only, or a MicroProbe® sampler (2" diameter version of the Simulprobe®)if ground water and soil samples need to be taken simultaneously. Chemical Analysis: The soil and ground water samples will be analyzed for TPHg, benzene, toluene, ethyl benzene, and xylenes, (BTEX) by EPA Methods 8015/8020 at a California certified laboratory. The samples will also be analyzed for oxygenated fuel additives Methyl tert-Butyl Ether (MTBE), Tertiary Amyl Methyl Ether (TAME), di-Isopropyl Ether (DIPE), Ethyl tert-Butyl Ether (ETBE), tert-Butanol, and ethanol using EPA Method 8260. Methanol will be analyzed by EPA Method 8015 (modified).. Proposed detection limits for the oxygenated fuel chemical compounds in water are as follows: MTBE - 5 pg/L, TAME- 5 µg2, DIPE - 5 µg/L, ETBE - 5 pg/L, tert-Butanol - 100 gg/L, ethanol - 500 Vg/l-, and methanol — 1 mg/L. Proposed detection limits for the oxygenated fuel chemical compounds in soil are as follows: MTBE - 0.1 mg/kg; TAME - 0.1 mg/kg, DIPS - 0.1 mg/kg, ETBE - 0.1 mg/kg, tert- Butanol -5,0 mg/kg,ethanol -25 mg/kg, and methanol- 1.0 mg/kg. Ground Water Aquifer Testing: Cambria will perform an aquifer pumping test on proposed well MW-3. The aquifer pumping test will run for a total of approximately 12 hours. Ground water will be extracted at a constant flow rate via an electric submersible pump. Drawdown in the recovery well and surrounding wells will be taken periodically. Water extracted from the well will be stored onsite for disposal. A ground water sample will be collected at the beginning,middle, and end of the test and analyzed as.above. 3