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_ Section No 6 <br /> Revision No 1 <br /> Date January 13, 1992 <br /> Page 26 of 55 <br /> ■ All sampling equipment which contacts or may contact the sample <br /> prior to analysis shall consist of _previously unused dedicated <br /> equipment or equipment which has been thoroughly decontaminated <br /> prior to use, <br /> • Equipment decontamination at a minimum shall consist of a thorough <br /> steam cleaning followed by a triple deionized water rinse or a <br /> thorough cleaning using a Liquinox soap solution followed by a <br /> triple-deionized water rinse, <br /> w Additional equipment decontamination or use of dedicated sampling <br /> equipment may be implemented based on the results of quality control <br /> checks (in field blanks) as described in Section 11 0, <br /> ■ Prior to advancement of any subsurface probes, all underground <br /> conduits should be located by contacting Underground Service Alert <br /> (USA) and the owners of the property under investigation, <br /> ■ The probe shall be advanced vertically to the desired sampling depth <br /> using hydraulic pressure or percussion methods, <br /> a The probe shall be withdrawn slightly to allow groundwater to enter i <br /> the bottom of the problem (i a detachable or retractable probe <br /> .� _ _ __ _ _ -point) ,- -_ _ _ _ .... __ ___ _ _ •_ _ _ _ _- <br /> ■ A peristaltic-pump- or-venting tube shall -be connected to the- top of <br /> the probe and activated, <br /> r For shallow applications , a water sample shall-be collected from the <br /> discharge of the pump, appropriately labeled and placed in <br /> refrigerated storage, <br /> ■ For deep applications , a water sample shall be collected by <br /> withdrawing the probe to the surface (water is held in sampling <br /> chamber by one-way valves) and transferring the water to the <br /> _ appropriate - bottles, appropriately labeled„ and placed in <br /> refrigerated storage, <br /> r Following each collection, the probe shall be withdrawn and if <br /> deeper samples are required, the borehole shall be advanced to the <br /> desired depth and the sampling process re-initiated If deeper <br /> samples are not required, the probe hole shall be filled with a <br /> cement or bentonite mixture to grade, <br /> • <br /> 6-26 <br />