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.L <br /> <br /> 4 min. <br /> <br />Not to Scale <br /> <br /> mc on <br /> <br />Precost vault boz [opiionol) <br /> <br />probe top (~ee detail} <br /> <br />Fine groined moil backfill <br /> <br />I/Z" Sch. 40 PVC pipe <br /> <br />concrete or bentonite seal <br /> <br />I/8" I.D. Tygon tubing <br /> <br />I/2" Sch. 40 PVC coupling <br />Weld with solvent cement <br /> <br />Gas probe tip (See detail} <br /> <br />Pen gravel or graded rock <br /> <br /> FIGURE <br /> <br />:'RO O £ CT NC <br /> <br /> <br />