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3 � <br />_4 <br /> 1 <br /> Mitigation Work Plan AGS 86102-2P <br /> Beacon Station #3-492, Manteca, California <br /> May 26, 1987 <br /> diesel fuel to levels above action levels for drinking water <br /> established by the California Department of Health Services. <br /> Contaminant distribution and information 'derived `from soil vapor <br /> probing suggests that ground watet' flow is oriented tataxd'che <br /> northeast. The detected levels are significantly higher in <br /> groundwater immediately adjacent to the tank cavity OV-1 and <br /> MW-2) than in the up-gradient well OV-3) . Results of previous <br /> analyses of soil and ground water are summarized in Table 1. <br /> TABLE <br /> RESULTS OF CHEMICAL ANALYSES OF SOIL AND WATER SAMPLES <br /> r <br /> BEACON STATION #3-492, MANTECA, CALIFORNIA <br /> € SAMPLE fP/("C, TPA.'I <br /> ETHYL- <br /> NUMBER THCV THCEBENZENE BENZENE TQLUENE X'TOTA <br /> SLS <br /> SOIL A4%PLES <br /> 57,15-81 ND 8 ND <br /> 5-20-BZ 15:.9 76 ND ND ND <br /> S-25-B1 4.3 0.7 7.1 ND 25.1 <br /> 21 ND ND ND ND <br /> 5-15-82 66.3 ND ND 1.5 2.3 <br /> 5-15-83 1.1 ND ND ND 15.5 <br /> S-12-84 13.39 20 ND 0.72 O.46 ND3.9. <br /> S-12-BS 874.8 947 8.2 28.4 48.8 279.74 <br /> s PATER SAMPLES <br /> W-26-MW1 7.297 0.077 0.145 0.024 0.569 <br /> W-26-PW2 1.829 - 0.054 0.061 0.132 0.869 <br /> W-26-MW3 0.034 - ND ND 0.004 0.008 <br /> MAY 14, 1987 <br /> - - - -W-z5-MW1- -17:732---- --- <br /> - — - <br /> 0.158 0.305 <br /> Sri . 0.143 1.430 <br /> -25-1�f4�2 17;495 -- 0.725 0.497 3.086. 4.475 <br /> id-2a-MW3 0.119~ -x_0.0021 0.0015 . 0.0053 0.0114 <br /> Values listed are: n milligrams per kilogram (parts <br /> THC.= perm 12 on). <br /> - Total volatile hydrocarbons <br /> THCE Total ,extractable hy;Jracarbonl: <br /> ND Not present or bels~ method detection limits <br /> 3 . <br /> S0,0/18d 47igoS�Sf�f1fS <br />