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s 23 October 1998 <br /> AGE-NC Project No 95-0184 <br /> IPage 2 of 4 <br /> Preservative.The samples were labeled,placed in a chilled container and transported under chain-of- <br /> custody to McCampbell Analytical, Inc (MAI) in Pacheco, California The samples were analyzed <br /> for ' <br /> • Total petroleum hydrocarbons quantified as'gasoline (TPH-g) in accordance with EPA <br /> Method 5030/8015m <br /> • Volatile aromatics hydrocarbons (benzene,toluene, ethylbenzene and xylenes, BTEX) with <br />' methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 602/8020 <br /> • Volatile organic compounds and oxygenated compounds (di-isoopropyl ether [DIPE], ethyl <br />' tertiary butyl ether [ETBE],tertiary amyl methyl ether [TAME] tertiary butanol [TBA] and <br /> MTBE) in accordance with EPA Method 8260 <br /> The sample from MW-4 was also analyzed for total petroleum hydrocarbons quantified as diesel <br /> (TPH-d) in accordance with EPA Method 8015m <br /> 3.0. FINDINGS <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The average depth to ground water at the site was 32 87 feet below the well casing tops during the <br /> July 1998 monitoring event Ground water elevation increased an average of 2 25 feet between April <br /> and July 1998 Ground water was approximately 22 feet above the screened interval in monitoring <br /> wells MW-1, MW-2 and MW-3 Ground water was approximately 12 feet above the screened <br /> interval in MW-4, VW-213 and VWSC, seven feet above the screen in MW-7, two feet above the <br />' screen in,VW-3 and less than one foot above the screen in VW-4 Ground water was within the <br /> screened Interval of well VW-5B only Unlike in previous monitoring events, ground water <br /> elevations in MW-1, MW-2 and MW-3 were similar to elevations calculated for the surrounding <br />' wells at the site The ground water gradient and flow direction calculated using these three wells was <br /> similar to that calculated using only the surrounding wells Vapor well VW-5 was installed at an <br /> angle of approximately 15°from vertical and therefore was not used for calculating the ground water <br />' flow direction <br /> The inferred ground water flow direction in July 1998 was toward the northeast with a gradient of <br />' approximately 0 003 ft/ft (Figure 3) Measurable free product was not detected with the interface <br /> probe during the July 1998 monitoring event <br /> Advanced GeoEnvlronmentat,Inc <br /> ` <br /> I <br />