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• .e }� R TZ' <br /> Mitigation Work Plan AGS 66102-2P <br /> Beacon Station 43-492, Manteca, California May 26, 1987 <br /> e <br /> t The results of previous analyses indicate the contamination <br /> originated from leakage near the north end or the tank cavity, <br /> and that the dominant direction of mo,, <br /> rement was vertically <br /> downward t.o ground water, at approximately 15 feet. Soil samples <br /> ,k <br /> taken near the ground water surface in 8-1 (MW-1) and E-2 (MW-2) � <br /> f showed relatively low levels of contamination in soil a short <br /> distance down-gradient from the tank cavity, Analyses of samples <br /> from MW-3, southeast of the tank cavity, shag, very low levels of <br /> �. contamination. <br /> CONTAMINATION MITIGATION <br /> Applied GeoSystems proposes' <br /> s-that the <br /> ground water contamination <br /> E" . be mitigated by withdrawal from. MW-2 and discharge to the <br /> - <br /> sanitary' sewer system: Soil contamz'nation should he mitigated <br /> s <br /> through installation-and operation of a soil venting system, <br /> using wells completed in' khe vadose zone and installed within or <br /> 'immediately adjacent to the tan!c_cavity, <br /> SOIL VAPOR W NTING <br /> The primary form of soil contamination mitigatiop sai;l be & sai7 <br /> 1 'vapo,r venting system., The .domiziant,'form of contamination appears <br /> to be gasoline, which consistsalmost .en:irely of volatile <br /> 4 <br />