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,� - <br /> !s the <br /> boring location —YES --- <br /> specified� <br /> 6rlll at the specific.} <br /> borirg location. <br /> NO <br /> Barings should be within at <br /> least 10 ft of the suspected <br /> leak area. If feasible, the <br /> borings should be in the <br /> backfill rrea and in down <br /> gradient direction. <br /> Sanples should be taken at <br /> every 5 ft to at least 30 ft MONITORING WELL FLOW CHART <br /> below the lowest point of the <br /> storage tank or to a maximum <br /> depth of tis ft from ground FOR FUEL LEAK INVESTIGATIONS <br /> surface. <br /> Encounter <br /> groundwater? YES <br /> Drill at least 15 ft into <br /> the saturated zone. <br /> NO Nate: No samples should <br /> be tako: in the saturated <br /> zone. <br /> Abarxinr, boring according to <br /> CAWCO gtid-lines. (Grout NO <br /> boring). <br /> EncoLmter a CLAY layer Is it <br /> withinthe 15 ft YES more than 5 ft in IES <br /> saturated zore� hickness?,"" <br /> NO <br /> Step drilling and baekfilE wi[a <br /> concrete to top of clay or <br /> impervious layer. <br /> Set MCnitoring well to <br /> bottom of boring, s_reen <br /> to bottom and 5 ft above <br /> saturated zone. <br /> ARCO AH/PH ,MINI MARKET FACILITY MONITORING WELL FLOW CHART <br /> BALBI & CHANG ASSOCIATES PROJECT No. DATE 5/23/88 <br /> Geotechnical Consultants /Materials Testing PREPARED BY ]3R. PLATE Z S <br />