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+i + <br /> GROUNDWATER MONITORING <br /> On August 21, 1995, a Smith Environmental technician measured the water levels in wells <br /> MW-1 through MW-5, well RW-1, and piezometer PZ-1. No floating product was noted in <br /> any site well. Groundwater monitoring data are summarized in Table 1. <br /> The depth to water measurements and the elevations of the well casings (Table 1) were used to <br /> evaluate the groundwater flow direction and gradient beneath the site (refer to attached Field <br /> Procedures) Groundwater elevation beneath the site dropped an average of 0 35 feet since <br /> May 30, 1995 <br /> Groundwater flow direction was generally to the northeast at a gradient of approximately <br /> 0 0051 ft/ft as depicted on Figure 3. <br /> On August 21, 1995, groundwater samples were collected from wells MW-1 through MW-5 <br /> for laboratory analyses The field methods used are presented in Attachment 1 Field purge <br /> logs are included in Attachment 2 Groundwater samples were analyzed by Sequoia Analytical <br /> for total purgeable petroleum hydrocarbons (TPHg) using Environmental Protection Agency <br /> (EPA) Method 8015 modified, total extractable petroleum hydrocarbons (TPHd) using EPA <br /> Method 8015 modified, and benzene, toluene, ethylbenzene, and total xylenes (BTEX) using <br /> SEPA Method 8020 Copies of the laboratory reports and chain of custody documentation are <br /> included in Attachment 3. <br /> Results of laboratory analyses indicated dissolved TPHg was detected in the samples from <br /> wells MW-1 and MW-2 at 7,900 parts per billion (ppb) and 55 ppb, respectively The TPHg <br /> in well MW-2 was reported by the laboratory as an unidentified hydrocarbon <C8 No TPHg <br /> was detected in any other site monitoring wells <br /> BTEX constituents were detected in well MW-1, most notably benzene at 1,600 ppb Xylenes <br /> were detected in MW-2 at concentrations of 0 56 ppb MW-5 contained benzene at <br /> concentrations of 0 62 ppb and xylenes at concentrations of 0 58 ppb. <br /> TPHd was detected in wells MW-1 and MW-5 at 1,900 ppb and 190 ppb, respectively The <br /> laboratory results of TPHd were reported as unidentified hydrocarbons in the C9-C24 range <br /> No TPHd was detected in any other site monitoring wells <br /> No petroleum hydrocarbons were detected in monitoring wells MW-3 or MW-4. Results of <br /> laboratory analyses are summarized in Table 2. <br /> 38009-1013QSR95d0c 2 <br /> s <br /> SMTH <br />