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09 July 1999 <br /> AGE-NC Project ct No 95-0184 <br /> Page 2 of 4 <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable bailers Each sample was <br />' transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochlonc acid as a <br /> sample preservative The sample from MW-4 was also transferred into a 1-liter amber bottle without <br /> preservative The sample containers were labeled,placed in a chilled container and transported under <br />' chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco, California, a California <br /> Department of Health Services (DHS)-certified analytical laboratory 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, and <br />' • Volatile organic compounds and oxygenated compounds (di-isopropyl ether [DIPS], 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 /> Results of laboratory analysis of ground water samples and a discussion of data collected during field <br />' work follows <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br />' The average depth to ground water at the site was 31 20 feet below the well casing tops during the <br /> March 1999 monitoring event Ground water elevation increased an average of 1 67 feet between <br /> July 1998 and March 1999 Ground water was approximately 23 to 24 feet above the screened <br />' interval in monitoring wells MW-1, MW-2 and MW-3 Ground water was approximately 13 to 14 <br /> feet above the screened interval in MW-4, VW-213 and VW5C, 8% feet above the screen in MW-7, <br /> 4 feet above the screen in VW-3 and 2 feet above the screen in VW-4 Ground water was within the <br /> screened interval of well VW-513 only Ground water elevations in deeper wells were similar to <br /> elevations calculated for the shallower wells at the site Vapor well VW-5 was installed at an angle <br /> Advanced GeoEnvironmental,Inc <br />