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Vault box Gas probe top <br /> Ground surface Ground surface <br /> Gravel (Typ.) <br /> Fine—grained soil backfill (Typ.) <br /> 4' <br /> 1/2" Sch. 40 PVC pipe (Typ.) <br /> Depth Varies 21 <br /> e o <br /> 1/2" Sch. 40 PVC coupling (Typ.) <br /> 1/2" perforated Sch. 80 <br /> PVC pipe (Typ.) <br /> Fine gravel (Typ.) <br /> Probe tip (Typ.) <br /> 4" min. <br /> SINGLE PROBE INSTALLATION <br /> DETAIL- <br /> N.T.S. <br /> SAN JOAQUIN COUNTY FIGURE <br /> FOOTHILL SANITARY LANDFILL 1 <br /> SAN JOAQUIN COUNTY LINDEN, CALIFORNIA 14 <br /> DEPARTMENT OF PUBLIC WORKS PROJECT No. j <br /> GAS MONITORING PROBE DETAIL 95-01 <br /> 34 <br />