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M - <br /> E <br /> 16 November 1998 <br /> AGE-NC Project No. 97-0351 <br /> Page 2 of 4 <br /> Additional sample from wells.MW=1and MW­2 was-transferred-into chilled.1-liter amber bottles. <br /> The samples were placed in a .chilled container and transported under chain-of-custody to <br /> McCampbeli Analytical., Inc. (MAI), a California Department of Health-Services (DHS)-certified <br /> analytical laboratory located in Pacheco, California. Each sample was analyzed in accordance with: <br /> r , EPA Method 8015m for total petroleum hydrocarbons quantified as gasoline'(TPH=g), <br /> _ EPA Method 8020 for volatile aromatic compounds (benzene, toluene, ethylbenzene and.' <br /> total xylenes: BTEX) and Methyl tertiary-butyl ether(MTBE), <br /> EPA Method 8260m for di-isopropyl ether(DIPS),ethyl tertiary butyl-ether(ETBE),'methyl <br /> tertiary butyl ether (MTBE), tertiary amyl methyl ether(TAME)and tertiary butyl alcohol <br /> (TBA). <br /> Two.water samples were also analyzed in accordance with: <br /> • EPA Method 8015m for total petroleum hydrocarbons quantified'as diesel (TPH-d). <br /> 3.0. ' FINDINGS <br /> 3.1. RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> .The relative elevation of ground Water in each well was calculated by subtracting the ground water <br /> depth from the surveyed relative casing elevation.The wells were surveyed relative to the top of well <br /> MW-1,with a relative elevation of 10 feet above mean sea level. The relative ground water elevation' <br /> data is summarized in Table 1: <br /> Ground water flow direction in the area of the western UST was toward the southeast at a gradient <br /> of approxiniately 0,004 ft/ft or.22.6 feet/mile. The flow direction in the'area of the east UST was. <br /> generally southeast. Contoured ground water elevations are shown in Figure 3. <br /> 3.2. . HYDROCARBON-IMPACTED GROUNDWATER <br /> The results of laboratory analysis of groundwater samples collected at the site over the last quarter <br /> are as follows: <br /> • TPH-g and benzene were detected in the sample from ground water monitoring well MW-1 <br /> at concentrations of 5,700 micrograms per liter(ug/l) and 230µg/l, respectively: <br /> Advanced-GeoEnvironmental,Inc. <br />