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l <br /> Mr. Michael Infurna <br /> Page 2 <br /> Prior to sampling, monitoring wells MW 1 through MW3 were purged of a minimum of three well casing } <br /> volumes. During the purging process the physical parameters of temperature,pH and electrical conductivity <br /> were measured. Samples were collected after the physical parameters stabilized and 100% water level <br /> recovery. Purge water was contained in appropriately labeled DOT-approved 55-gallon drums, and is <br /> currently being stored onsite. Purge logs are included in Attachment A. <br /> Groundwater samples were delivered under chain of custody protocol to Argon Laboratories(FLAP#2359). <br /> Analysis consisted of BTEX using EPA method 8020,TPHg and TPHd using modified EPA method 8015, <br /> gasoline oxygenate additives, 1,2 DCA and EDB using EPA method 8260. <br /> GROUNDWATER ANALYTICAL RESULTS <br /> 1 <br /> No detectable levels of TPHg, TPHd, BTEX, or gasoline oxygenate additives were present in the samples <br /> collected from wells MWI and MW2. 1,2 DCA and EDB were not detected in any site wells. In the <br /> sample collected from MW3, benzene was detected at 2.4 parts per billion (ppb). TPHg and TPHd were <br /> reported at concentrations of 4,500 ppb and 5,600 ppb, respectively; and MTBE was detected at a level of <br />' 2,600 ppb. Analytical results are summarized in Table 2. Attachment B contains laboratory reports and <br /> chain of custody documentation. <br /> SUMMARY <br /> • Groundwater levels at the site have decreased since the last round of sampling. <br /> • Groundwater continues to flow in a southeasterly direction. <br /> • Wells MWl and MW2 continue to show non-detectable levels of targeted analytes. <br /> • In well MW3, the concentration of benzene increased slightly, and the levels of TPHd, TPHg and <br /> MTBE increased an order of magnitude since the last sampling event. <br /> CONCLUSIONS <br /> No detectable levels of target analytes have been present in either well MW or MW2 since sampling began. <br /> Contaminant concentrations at the site appear to have a direct relationship with groundwater level fluctuation. <br /> Analytical results from the previous two quarterly events in well MW3 showed a reduction in contaminant <br /> concentrations as the water level at the site rose. During this event, water levels at the site decreased and the <br /> contaminant concentrations in well MW3 increased. <br /> l <br /> woobey.chtlgmr13 gm2000.doc <br />