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4 / <br /> survey _provides information on the presence cf rOCs batteuCh the site and <br /> (depth <br /> rather than the actual concentrations or <br /> f - their relat_ve can�e�strations,of the target ch•.mical consti:Lonte��-- <br /> .y <br /> 2.4 REPORT PREPANITy014 <br /> The ,ort gar ,..r`<ey results will be used to prepare soil gas <br /> concentration Fcaps for r?sP casnpounds detected. These maps will be presented <br /> txtheprepared upon completion of the soil gas investigation. The <br /> in s report p <br /> as robe or in <br /> prate^.ce of volatile prganic compounds <br /> the dsoin near soil the sof.las may b gas <br /> ted t stile <br /> px'asence of these compounds <br /> v1 underlying ground water. ,.n addition.' there are situations where volatile <br /> i,i compounds could migrate laterally <br /> concentration the <br /> mapsawill zone <br /> prov deo the basis confining <br /> i" clay layer. The soil gas <br /> evaluate whether consistent compound distribution patterns c:.:: be observed <br /> that may indicate the presence of solvents ;:� soil or grour_c'water. <br /> QUALITY <br /> A <br /> S <br /> 5 <br /> URANCE AND QUALITY ITY CONTROL <br /> .S Q <br /> 2 <br /> These <br /> Dames & Moore's normal quality assurance procedures as 1 samples. These <br /> in <br /> order to prevent any cross-cont urination of soil <br /> P <br /> PICLadures ;naLcde: <br /> o Stainless steel probes will be washed V'th high pressure soap and <br /> hot water spray, a steam-cleaned betweensampling <br /> eliminate i <br /> f -the possibility of cross-conraminati <br /> o.1 <br /> t ; rifted air <br /> p cleaned bYtween samples by blowing u <br /> 5yri.ngas are <br /> p <br /> through the syringe. 5yxiesge blanks are run when needed to bssure <br /> quslity control. <br /> Septa through wtti,h soil gas samplss are l <br /> prevent pos�ible <br /> �.s chromatograph are- replacLd on a daily basis a <br /> gas leaks from the chromatograph coleach day rnn. <br /> t o' Analytical instruments are librated <br /> st.ndards. Calibration Tcne ks are <br /> b commercially available chemicalt ay sem yin locations, <br /> also run after every five to ten so_1 g piing <br /> depending on change G ir. ambient temperature. ' <br /> i <br /> n..to <br /> Ivil 0Prior to sampling each day, machine and syringe blanks are ru <br /> check the Sampling apparatus for contamination l+y drawing ar.+bient <br /> �r air from above ground through the system ` and comparing the <br /> a concurrently sampled air analysis. <br /> analysis to <br /> ing the <br /> E o All sampling s,vringes are decontaminated by put cacti equipmen Syr <br /> stnge iis <br /> with a carrier gas blank between amplss and no <br /> x <br /> reused prior to deconcaminatiori. <br /> LD01.022 �. <br /> i Y <br />