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40 <br /> s Color Spot, Inc. D 6 <br /> October 10, 1989 (88168B) B1 <br /> APPENDIX B <br /> w <br /> ENVIRONMENTAL MONITORING, SAMPLING AND ANALYTICAL PROTOCOLS <br /> } <br /> SOIL. VAPOR SURVEY <br /> [ f A soil vapor survey was conducted at the facility to evaluate the <br /> lateral excent of fuel contamination. A grid was developed around the tank <br /> excavation area and areas Of suspected contamination (see Figure 2). The soil <br /> -vaprsampling locations were selected as the survey progressed with the <br /> objectives <br /> t of enclosing the soil vapor hydrocarbon contamination inside the grid <br /> and mapping total volatile petroleum hydrocarbon (TVPH) and BTEX concentrations <br /> -�, at a depth of 6 feet below ground surface (b <br /> - g.,). A 7/8-ir_ch outside diameter, <br /> hollow, steel probe was driven into the subsurface at each sampling location to <br /> 6 feet bgs. Dense compacted soil was encountered at 6 feet bgs and could not <br /> -y be penetrated with the probes. The lower end of the probe was equipped with a <br /> j slotted section which allowed soil vapors to enter the hollow stainless steel <br /> probe shaft. The p <br /> ,�- probes were driven to the desired depth with a ower hammer, <br /> f - <br /> j The probe was connected to a peristaltic pump and PID using Teflon <br /> taw- r, ant_-Stainless steel appurtenances. The stainless steel appurtenances <br /> include a vacuum gauge and injection port connected in series with the probe and i <br /> :—� peristaltic pump. The vacuum sauce was used to check for blockage of the soil <br /> var,+or. sample'' (e.g,, if the blots in the probe had become plv.gged) and the <br /> injection port was used to ratrieve the sail vapor sample. The soil vapor sample <br /> flaw was routed between the peristaltic pump (vacuum gauge and injection port) <br /> and PID via a three-:ray valve. <br /> ! _ Each soil vapor sampling location was purged by the peristaltic pump <br /> for two to three minutes before a sample was <br /> • � � p analyzed. During this 2- or 3- <br />.►�� minute period, the vacuum gauge was checked '"and the soil vapor hydrocarbon <br /> concentrations monitored with a PID. Once the PID readings stabilized, a soil <br /> vapor sample was collected from the injection port with a gas tight microsyringe. <br /> i. The sail vapor sample was injected into a portable field GC manufactured by <br /> -° :natovac. Internatzonal,`Inc. , Model LOS70 (GC-PID) for analysis. <br /> i ane_GC-PID is-a--equipped_,pith-a.-0.53-mm-wide ? : eapillary-column, <br /> an isothermal oven to maintain column temperature (GO°C)� and a PID. The <br /> GC- <br /> -- -- - - <br /> RIP is programmed to. ider_cify and quantify benkene, toluene, ethylbenzene.and <br /> Xylenes (BTEX), .end TV!-, (for diesel, fuel and gasoline) is computed from the <br /> i chromatogram. The Gv.:PID carrier gas (Ultra Zero Air) flow rate war Set at 10 E <br /> ml/min. <br /> r . <br /> ilia 10111 <br />