Laserfiche WebLink
FARR ASSOCIATES <br /> Groundwater Sampling <br /> On August 9, 1996 and March 6, 1997, groundwater samples were collected from monitor <br /> i Wells MW-1 through MW-5. Each well was purged of approximately 3 well-casing volumes <br /> y prior to sampling. The purge water was contained within a labeled, DOT-approved, 55-gallon <br /> storage drum. The sampling equipment was decontaminated between each use in order to <br /> prevent cross contamination. <br /> After purging each well of three well casing volumes of water, a groundwater sample was <br /> collected from each well using a disposable polyethylene bailer. The sample water from each <br /> well was carefully poured from the bailer into three 40 ml glass vials (VOA vials) and two 1 <br /> liter amber-glass bottles. The sample bottles were labeled, recorded on a chain-o£-custody <br /> form, and stored in a chilled ice chest for transportation to American Environmental Network, <br /> a State certified analytical laboratory in Pleasant Hill, California. A travel or "trip" blank was <br /> prepared for each sampling event using distilled water to evaluate potential sample <br /> contamination during storage_and transport of the samples. Transport and handling of samples <br /> f were performed under strict chain-of-custody protocol. The.groundwater analytical data sheets <br /> and chain-of-custody records are contained in Appendix A of this report. <br /> The groundwater samples were analyzed for BTEX and TPH-g (EPA Method 8020) and <br /> TPH-d (EPA Method 3510). The trip blanks were analyzed for BTEX and purgeable <br /> hydrocarbons as gasoline. <br /> Groundwater Analytical Results <br /> Results of the groundwater chemical analyses are shown on Figure 5 for the August 1996 <br /> t monitoring event and Figure 6 for the March 1997 monitoring event. Table 2 lists the results <br /> of these recent analyses, along with the historical data. Groundwater samples collected from <br /> Well MW-2 yielded the highest concentrations detected at the site.T Table 4 shows that the <br /> compounds detected in the August 1996 sample collected from MW-2 included: gasoline range <br /> R41820A-625960-8 <br /> "nionice/soiISm3.wpd 8 <br />