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i r27 December 2005 AGE-NC-95-0185 ' Page 2 of 4 After free product removal,the water and free product were stored on-site in a 55-gallon Department ' of Transportation (DOT) H-17 storage drums. The removal was performed in accordance with California Underground Storage Tank Regulations, Article 5, Section 2655. 2.2. QUARTERLY GROUND WATER MONITORING rAGE conducted quarterly ground water monitoring on 17 August 2005. 2.2.1. Well Monitoring andEvacuation The water level and any free-phase petroleum product in wells MW-1 through MW-4 were measured ' relative to the tops of the well casings using a Solinst free product interface probe;the ground water elevations and gradient were determined from this data(Table 1). 'n well was purged with a dedicated After gauging the depth to ground water, each monitoring p g > disposable bailer. Between 1.25 to 3.25 gallons of ground water were removed from wells MW-1 through MW-4. Temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer(Appendix B).Purged water was stored on-site in 55-gallon DOT-approved drums. r . 2.2.2. Collection and Analysis of Ground Water Samples Ground water samples were collected from the purged wells using the dedicated, disposable polyethylene bailers. Each water sample.was transferred into three 40-m1 volatile organic analysis I ' (VOA)vials containing 0.5 ml 18%hydrochloric acid as a sample preservative and one 1-liter amber bottle without preservative. The samples were then labeled and placed in a chilled container for transport under chain of custody to Cal Tech Environmental Laboratories (CTEL) of Paramount, a ' California Department of Health Services (DHS)-certified analytical laboratory. All water samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 8015 Modified and • Benzene, toluene, ethylbenzene and total xylenes (BTEX), and the fuel additives methyl tertiary butyl ether(MTBE),tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME)in accordance with EPA Method 8260 Modified. ' Advanced GeoEnvironmenial,Inc.