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GGOMAYRIX <br /> ® groundwater samples were collected from previously installed on-site monitoring wells <br /> (MW-2,MW-3, and MW-4) and an off-site monitoring well WFSMW-1, which is located on <br /> the WFS property north and downgradient of the site (Figure 3). Prior to sampling the wells, <br /> water levels were measured and the presence of separate-phase petroleum was evaluated using <br /> a hydrocarbon-water interface probe. <br /> On-site wells MW-2> p Y MW-3 and MW-4 were sampled b a Geomatrix field technician after a <br /> ® minimum of four casing volumes of water had been removed from each well using a clean dis- <br /> posable bailer. Water-quality parameters measured and recorded during purging included pH, <br /> specific electrical conductance, turbidity, and temperature. The clarity of the water also was <br /> observed. After water-quality parameters stabilized (a minimum of three consecutive readings <br /> with values within 10 percent for each parameter), groundwater samples .were collected using a <br /> new polyethylene disposable bailer. The off-site monitoring well, WFSMW-1, was purged by <br /> Blaine Tech field technicians using a submersible Grundfos pump and then sampled by a <br /> ® Geomatrix field technician using a disposable bailer. <br /> The groundwater samples were collected in accordance with Geomatrix protocols and decanted <br /> into acidified 40-milliliter volatile organic analysis(VOA) vials and 1-liter amber bottles pro- <br /> vided by the laboratory. Sample containers were labeled, sealed in plastic bags, and placed <br /> immediately in an ice-cooled chest for subsequent delivery to F&B under Geomatrix chain-of- <br /> custody procedures. <br /> ® Development water and cleaning rinsate were placed in steel 55-gallon drums, identified with <br /> pending analysis labels, and temporarily stored at the site pending future off-site disposal by <br /> r ChevronTexaco. <br /> 4.3 ANALYTICAL METHODS <br /> Soil samples were analyzed for TPH quantified as crude oil (TPHc; C10-C36 carbon range) <br /> using EPA Method 8015 Modified; BTEX using EPA Method 8021 B; and polynuclear aro- <br /> matic hydrocarbons (PAHs) using EPA Method 8270 SIM. Additionally, the shallow soil <br /> samples (i.e., 5 and 10 feet bgs) collected from boring GMX-1B were analyzed for VOCs using <br /> EPA Method 8260B. <br /> IloakI\deptdata\Doc_Safe16000s16447.00I\ReponlUS Can S616 Rpt.doc 7 <br />