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FIGURE 4-1 <br /> ACTION LEVEL GUIDELINES <br /> FOR <br /> UNDERGROUND STORAGE TANK FIELD ACTIVITIES <br /> E . <br /> I <br /> VOC <br /> ENTRATION 25 UNITS No SO UNITS 100 UNITS 500 UNITS <br /> KGROUND <br /> f <br /> E !� <br /> VOC >25 VOC > ,50 , I VOC > 100 voc > soo <br /> OVER IS MIN OVER 15 MIN OVER J 5 MIN OVER 15 MIN <br /> BENZENE MODIFIED LEVEL C' LEVEL C EVACUATE SITE <br /> MONITORING or LEVEL 8 <br /> I <br /> _ � a <br /> E f� <br /> E i <br /> f <br /> VOC > i W VOC > 500 <br /> UNITS UNITS <br /> `tf <br /> f f <br /> 8ENZENE _ < I 0 IF BENZENE = I — <10 IF BENZENE - > 10 , <br /> (2 TUBES / 10 MIN) (2 TUBES / 10 MIN) <br />� LEVEL D ' <br /> ODIC MONI70RIN LEVEL C - PERIODIC EVACUATE SITE <br /> REQUIRED <br /> MONITORING REQUIRED or LEVEL B, <br /> E <br /> it <br />