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05 December 2007 AGE-NC Project No. 97-0327 Page 3 of 8 • Monitoring well MW-5 will be located between 95 and 105 feet south-southwest of well MW-4 to assess shallow 1.2-DCA-impacted ground water downgradient of MW-4. Soil samples will not be collected for laboratory analysis; however, soil samples will be collected at 5-foot intervals for logging purposes. Soil boring P-17Jwill I e only be advanced to approximately 55 feet bsg for collection of,a shallow grab ground water sample (i.e. first ground water); however, soil borings P-ly, and P-1�'will be advanced to depths of approximately 95 feet bsg for collection of shallow, intermediate (approximately 75 feet bsg) and deep grab ground water samples (approximately 95 feet bsg);monitoring well MW-5 will be advanced to a depth of 65 feet bsg.Total depth of each boring may vary slightly according to geologic conditions encountered during drilling. Field procedures for advancement of borings and well installation are presented in Section 3.1. Field procedures for grab ground water sample collection is presented in Section 3.2.; selected grab ground water samples will be analyzed by a State of California Department of Health Services (DHS)-certified laboratory for the following constituents: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPIi-g and TPH-d respectively) in accordance with EPA Methods 8015 Modified and • Volatile aromatic compounds-benzene,toluene,ethylbenzene and xylenes(BTEX),methyl tert-butyl ether(MTBE), 1,2-dichloroethane(1,2-DCA),ethylene dibromide(EDB),tertiary butanol(TBA),di-isopropyl ether(DI PE),ethyl tert butyl ether(ETBE)and tert amyl methyl ether (TAME) by EPA Method 8260 Modified. Laboratory reports for the ground water analyses, testing methods, laboratory quality assurance/quality control (QA/QC) reports, and sample chain of custody documentation will be presented in a report with findings and recommendations. 2.3. MONITORING WELL DEVELOPMENT AND SURVEY The proposed soil boring MW-5 will be completed as a 2-inch diameter ground water monitoring well. Following well installation,the well will be developed to maximize water flow and minimize the amount of' fine-brained sediment drawn into the well during pumping or bailing. After development, the top of each well casing (well head) will be surveyed to determine its elevation relative to mean sea level and global positioning system(GPS)coordinates, for submittal to the State of California GeoTracker database. Procedures for well installation, development and survey are presented in Sections 3.1 through 3.4. Advanced GeoEnvironmental,Inc.