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3.2 Blower Installation <br /> In December of 1993, a low-pressure blower was installed at the site. The blower was <br /> installed to provide a low-pressure air source to the remediation wells in preparation for <br /> inoculation of the hydrocarbon-consuming bacteria. The blower is currently operating 24- <br /> hours a day, except for shut-downs during routine maintenance. <br /> 3.2.1 Blower Type <br /> The blower is an EG&G Rotron EN 404 Explosion-Proof Regenerative Blower and is <br /> currently providing approximately 10 cubic feet per minute (cfm) of air to remediation wells <br /> VW-1 through VW-7 and monitoring wells MW-3, MW-4, MW-5 and MW-14 (Figure 3). <br /> 3.2.2 Background CO2 and OZ <br /> During January of 1994 data on background carbon dioxide and oxygen concentrations will <br /> be collected from each well. Sampling ports were installed at or close to each well head. A <br /> COZ OZ meter will be used to determine concentrations prior to inoculation of the bacteria. <br /> CO2 and 02 data will be collected twice a week until a pre-inoculation trend is seen. After <br /> a trend is determined, measurements will be collected on a weekly basis. <br /> After inoculation of the bacteria, measurements will continue to be collected on a weekly <br /> basis and presented in each Quarterly Report. <br /> 4.0 FINDINGS <br /> 4.1 Groundwater Gradient and Direction <br /> The depth to first groundwater ranges from 57 feet north of the site to 59 feet southwest <br /> of the site, indicating a two-foot rise in elevation since September of 1993. Figure 4 is a <br /> groundwater gradient map, based upon the data collected on December 27, 1993. <br /> Groundwater flow is south-southwest in the area. <br /> 4.2 Groundwater Contamination <br /> TPH as gasoline was detected in samples from EW-1, MW-7, MW-10, MW-11 and MW-14 <br /> at concentrations of 810 ppb, 210 ppb, 450 ppb, 75 ppb and 820 ppb, respectively. Benzene <br /> was detected in samples from EW-1, MW-10, MW-11 and MW-14 at concentrations of 37 <br /> ppb, 0.64 ppb, 7.1 ppb and 35 ppb, respectively. <br /> Toluene was detected in samples from EW-1 and MW-14; ethylbenzene was detected in <br /> samples from EW-1 and MW-14; and xylenes were detected in samples from EW-1, MW-7, <br /> and MW-14. Ethylene dibromide was detected only in the sample from MW-14 (1.1 ppb). <br /> �ep.l�&�,.; '1- 9 <br /> L33A. O MOR <br />