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RMWS <br /> Quarterly Monitoring Report/April-lune 1992 <br /> Smith's Canal Pump Plant <br /> r <br /> July 29, 1992 <br /> Page 2 <br /> Free floating product was observed in MW4 and subsequently removed using a disposable hand <br /> bailer during each monitoring episode. Free product thickness was measured using an oil/water <br /> interface probe with an accuracy of 0.01 feet (Table 2). To date approximately 3.05 liters of <br /> free product have been removed from MW4. All bailed product has been contained in DOT <br /> approved drums pending appropriate disposal. <br /> Groundwater samples were collected on June 23, 1992, from wells MWl, MW2, and MW3. <br /> Prior to sample collection, each sampled well was purged of a minimum of three well volumes <br /> of water to collect representative groundwater samples. Purged water was contained in 55 gallon <br /> drums (DOT H), labelled, and stored on site. Floating hydrocarbon product was noted in Well <br /> MW4 and measured to be approximately 0.39 feet in thickness. No groundwater sample was <br /> collected from MW4 due to the presence of floating product. Groundwater samples were <br /> collected after physical parameters (pH, temperature, and conductivity) were monitored and had <br /> stabilized. Samples were collected from wells MWl and MW2 utilizing a centrifugal pump with <br /> a sampling port. A disposable bailer with a bottom-emptying device was used to collect a <br /> sample from well MW3. Field purge logs are presented in Attachment 1. <br /> LABORATORY ANALYSIS <br /> Samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) and total petroleum <br /> hydrocarbons as diesel (TPHD) by state-certified RESNA Environmental Laboratories utilizing <br /> EPA methods 8020 and modified 8015, respectively. Analytical results are summarized in Table <br /> 3. Laboratory data sheets and chain-of-custody documentation are included in Attachment 2. <br /> Laboratory results indicate dissolved hydrocarbon constituents are not present at or above <br /> laboratory detection limits in wells MW1, MW2, and MW3, suggesting that the floating product <br /> is limited to a localized area near the former tank. <br /> SCLRO792.TJL <br />