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v <br /> %TC <br /> A S S 0 C I A T E S I N C <br /> volumes of water. Purged water was contained in labeled 55-gallon drums (DOT H), and stored <br /> on site. <br /> Groundwater samples were collected after physical parameters (pH, temperature, and <br /> conductivity) were monitored and had stabilized. Dedicated disposable bailers with bottom- <br /> emptying devices were used to collect samples from the wells. Field purge logs are presented in <br /> Attachment 1. <br /> LABORATORY ANALYSES <br /> Collected groundwater samples were analyzed by Argon Laboratories, a State-certified <br /> laboratory, for total petroleum hydrocarbons as diesel (TPHd) utilizing EPA method 8015. <br /> Analytical results are summarized in Table 3. Laboratory data sheets and chain-of-custody <br /> documentation are included in Attachment 2. <br /> Laboratory results indicate that TPHd was detected in groundwater samples collected from well <br /> MW4 on October 1, 2002 at a concentration of 11,000 parts per billion(ppb). Analysis of samples <br /> collected from wells MW1, MW2, MW3, MW5, Iv1W6 and MW7 on October 1, 2002, did not <br /> indicate the presence of TPHd above method detection limits. <br /> .� CONCLUSIONS <br /> The detected concentrations of TPHd have been decreasing in groundwater samples collected <br /> over the last four quarterly monitoring events from all wells except well MW4. Furthermore, <br /> TPHd has not been detected above the method detection limits for at least two quarters in <br /> groundwater samples collected from all wells, except well MW4. <br /> w:162574.021quad1y\3gmr2002.doc 2 <br />