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08 April 2014 AGE Project No. 07-1537 Page 2 of 6 Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, the proposed boring locations will be clearly marked and a utility clearance obtained through Underground Service Alert. 2.2. SOIL-VAPOR WELL INSTALLATIONS AGE proposes to advance nine (9) soil borings for the installation of depth discrete soil-vapor wells. Soil-vapor wells will be installed surrounding the former tank pit area near wells MW-2 and MW-3 and near the current building structure surrounding well MW-5 (Figure 2). All proposed wells will be installed to a total depth of five feet below surface grade (bsg). Vapor wells are proposed for collection of soil-vapor samples to evaluate the potential for soil-vapor to intrude into onsite buildings or future structures constructed at the site as a result of the residual adsorbed and dissolved plumes and to evaluate the bio-attenuation zone. 2.3. SOIL PROBE BORING AND SAMPLE COLLECTION AGE proposes to advance two borings adjacent to the boring B1 and well MW-2 for collection of five and ten-foot soil samples to evaluate the bio-attenuation zone. The proposed soil boring locations are illustrated in Figure 2 Field procedures for advancement of borings and collection of soil samples are presented in Section 4.1. 2.4. LABORATORY ANALYSIS Soil samples for bio-attenuation zone analysis will be submitted and analyzed by a California Department of Public Health (CDPH)-certified laboratory for the following constituents: • Total petroleum hydrocarbon quantified as gasoline (TPH-g) in accordance with EPA Method 8015 Modified; • Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method 826013; • Fuel additives methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), ethyl tertiary butyl ether (ETBE), tertiary butyl alcohol (TBA) and di- ispropyl ether (DIPE) in accordance with EPA Method 8260; • Lead scavengers 1,2-dichloroethene (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA Method 826013; and • Naphthalene in accordance with EPA Method 82608. Advanced GeoEnvironmental Inc.