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a - - - _ r M - <br /> r <br /> r •. December 16, 1986 <br /> Beacon Service Station 43-492 - Manteca, CaliforniaGS 86102-1 <br /> in Table 2 and the .laboratory reports for all analyses are <br /> included in the Appendix of this report. <br /> TABLE 2 <br /> RESULTS OF CHEMICAL ANALYSES OF WATLR SAMPLES <br /> BEACON STATION #3-492, MANTECA, CALIFORNIA <br /> SAMPLE ETHk'L- ' <br /> NUMBER TVH BEN_ ZENE BENZENE <br /> TOLiIENE XYLENES <br /> W-26--MW1 •7.297 0.077" 0.145 <br /> r 0.024 0.569 <br /> W-26:.MW2 1.82.9: 0.054' 0.461 <br /> 0.132, <br /> W-26-MS+13.. 0.034" ND ND 0.004 <br /> Vald6s listed are in milligrams per kilogrPer.mt3liori� <br /> Detection limit: 0.005 ppm am (parts <br /> '7 <br /> = Total Volatile Hydrocarbons <br /> ND Not present or below method detection limits <br /> DETERMINATION OF GROUND NATER GRADIENT <br /> } <br /> A determination of the <br /> ground water gradient across the szte was <br /> made through the use of a Lietz Auto Level. The instrument was <br /> j <br /> used to measure the differences in elevation between the <br /> instrument .and the top of'the casing for each of the. monxtoring <br /> wells Measurements were recorded to the nearest sixteenth of an <br /> ;f <br /> 'inch. (0-005 foot), although the accuracy of the instrument is <br /> limited to 0.02--foot--Over--the-maximum--distance required <br /> r (approximately 75. feet) . . <br />