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c c_ i` <br /> . q <br /> ON <br /> Mot <br /> repreannta the curs of all V-zcc reaponns-.n, proportioned to that. <br /> for ban«ene. <br /> The gas chromtograph In operated in backflush mode to prevent <br /> contamination of the analytical column with high rf:,,ucot;rar_ions <br /> of interfering caa€r_pounds, Blanks are run to enburit that the <br /> system in free of contamination. ,ta neconnaary, the inotrument In <br /> re-calibrated by injecting atnndarda and Icy running ambient air <br /> blanks approximdtcly every two hours through the day. 'ricin re- <br /> calibration ensures that the nyaten In op�rat °tg consistently and <br /> that, parsr,,*^-tric chacnge& caused by ;experzat:)re chAnges through the <br /> day are accounted for. Theae data, along pith multiple standard <br /> runs, ensure system reprodreibility. <br /> r <br /> Results of the SVGA - j,srsented in Table 3. No petroleum <br /> hydrocarbons were can, nt :err ;n thw soil vapor at the Stockton <br /> site. It ahouls r? .. .cit tl,*. wet clay Nnn encountered in a <br /> number of lo"-Jr—t `:iU cal-­are can .,duce coil-gas movement <br /> by blockfrt,j t'.0 _. S ,.-rt;� s. In cp -n- u,iere wet clay wan noted <br /> SAppendi • p' . the NCA 5a4-,V1e_- rw, t be representative. <br /> Konitor;;.a Well 2 Cw+�2l vap-irs diel exhibit a lou level response. <br /> The tial-' cr jw ls:: _ -d this w.5 possibly due to spillage during <br /> E. tank fi.3!r.,, � lr; .r c:,-ie ..f the fill caps was located <br /> irjproxirvc_1y _wn rr feet from HW2. This. type of an <br /> occurrence tae be€n nk3erved prev.tots-ly by RA personnel. <br /> Recognizing this aaud noting the absence of measureable <br /> hydrocarbon vapors in the remaining 20 samples suggests that the <br /> soils aAd ground water of this site are not significantly <br /> contaminated with petroleum hydrocarbons. <br /> i <br /> f <br /> CHV1Cr:81R 5 <br />