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A <br /> 3 <br /> i <br /> 50IL VAPM COLIEMCU <br /> A solid 3/4 inch pipe is driven by 7acM=mler to a depth one Foot <br /> less than the desired sampling depth. Ihis maved Erten the pilaf <br /> referred to as the <br /> pilot hole. The 3/4 inch pipe is Bien r <br /> hole. A ding pzt� assembly is placed into the pilot hole <br /> and ham one to two feet into the undisturbed formation. Ve <br /> sangling probe consists of 5/L' rods hollow stainless steel <br /> rtaminatirg tubes dim with a perforated or slotted tip, <br /> wn�oand an upper evacuation and sampling assembly. (ser Figure 1 and <br /> 2) . <br /> once the saizplirg probe assembly is in place at the desired depth <br /> a vacuum of 20 inches of mercury (Hg) is pulled. The opening at <br /> allawes the vacuum to pull vapors f: the <br /> the lower tip zero vac�mrm suggests good <br /> formation. A fast rate of decrease in vacca� poor ding corrlition. No decree-e <br /> vapor sampling ccrr3itions arra ancrther sampling dem N'"t be <br /> attempted- <br /> The initial vaanrn purges the sample probe assembly. A second <br /> vacu fills the ass <br /> m embly with vapors to be tested. 30cc of <br /> vapors are e,,ctract.ed for analysis by use of a disposable syringe. <br /> The sample probe assembly is cleaned with Alconox, dried arra <br /> sterilized with open <br /> flame between each sample Point. <br /> EH v I g C a u 4 ry f t <br /> �i i p a ov-02,l3. int <br />