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v <br />CEMENT CONCRETE <br />DISTURBED SOIL <br />\moi\Z------- ----- <br />UNDISTURBED SOIL <br />FILTERING SAND <br />TO DETECTOR <br />2" or 4" PVC PIPE <br />HYDROCARBON VAPOR <br />SENSOR <br />PLAN <br />PERFORATED PIPE WITH SLOT <br />0.020 OPENING <br />FIGURE 1. GENERAL PLAN OF EXISTING SINGLE-WALL TANK MONITORING <br />P4 <br />.>r■■■■■.ml <br />MANHOLE COVER AND SKIRT <br />