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07 July 1997 <br /> AGE-NC Project No 95-0141 <br /> Page 2 of 3 <br /> I <br /> VOAs after filling and capping Ground water sample containers were labeled with the well <br /> designation, date, time, and sampler's initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of custody form, placed in a chilled container and <br /> transported to Castle Analytical Laboratories (CAL), a California state-certified laboratory for <br /> analysis of total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile aromatics (benzene, <br /> toluene, ethyl benzene and xylene BTE&X) v ith methyl-tertiary butyl ether (MTBE) in accordance <br /> with EPA methods 8015 and 8020, respectively <br /> 3.0. FINDINGS <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> In May 1997, ground water depths ranged from 21 95 to 22 60 feet in wells MW-1 through MW-5, <br /> while ground water elevation increased approximately 0 68 feet between February and May 1997 <br /> Furthermore, ground water was approximately 6 40 to 7 96 feet above the screen intervals of <br /> monitoring wells MW-I through MAV-5 <br /> In May 1997, the gradient was calculated at 0 008 ft/ft (approximately 42 feet per mile) Ground <br /> water monitoring data collected in the area of'i\W-1 through MW-3 suggests that the ground water <br /> flow direction was toward the north, northeast and northwest Ground water elevation contours <br /> appear to have a domed configuration in the MW-I through MW-3 area Ground water monitornng <br /> data in the area of MW-4 and MW-5 suggest that ground water flow direction was towajd the <br /> northwest (Figure 3 - Relative Gi ound Water Elevatwii%Map) <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples collected from wells MW-1 through MW-3 The <br /> highest concentrations of TPH-g was reported from MW-I at 33,000 µg/1 (micrograms per liter, <br /> equivalent to parts per billion ppb), and the lowest was reported from MW-2 at 1,800 ppb <br /> Benzene was detected in ground water samples collected from wells MW-1 throubh N4AV-4 The <br /> highest concentrations of benzene were reported from MWA at 5,900 ppb, and the lowest was <br /> reported from MW-4 at 1 2 ppb Toluene, ethylbenzene and xylenes were detected in samples <br /> collected from wells MW-1 through MW-4 The highest concentrations were reported from MW-1 <br /> at 2,300 ppb, and the lowest concentration was reported from MW-4 at 0 52 ppb <br />