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24 November 1997 <br /> AGE-NC-950103 <br /> ' Page 3 of 6 <br /> Due to unstable operation and low performance the SVE unit was monitored daily, when possible <br /> The flow rate of extracted vapor was measured using a Dwyer differential pressure flow meter <br /> Organic vapor concentrations in the extracted soil gas stream weie measured before entering the <br /> ' blower (influent stream), between the carbon canisters, and after exiting the canisters (effluent <br /> stream) using an organic vapor meter (OVA) equipped with a photo-ionization detector (PID <br /> Thermo Environmental 580A, 10 OeV, calibrated to isobutylene) <br /> Only one soil vapor sample was collected during this quarter The sample was collected after <br /> approximately fifteen days of continual operation On 22 September 1997 vapor samples were <br /> ' collected in Tedlar bags from the influent and effluent streams The samples were labeled, placed <br /> in a cool ice chest and transported under chain-of-custody to MAI <br /> 25 SOIL(] L TREATMENT AND WASTE DISPOSAL <br /> ' On 31 Tuly 1997, five drums of soil cuttings generated during the installation of the soil borings on <br /> the site were spread on the site for passive aeration On the sainne day approximately 500 gallons of <br /> previously purged ground mater, were collected by Nor Cal Oil of Turlock, California, for final <br /> disposal at a licenced treatment facility On 12 September 1997, oil and soil waste sludge was <br /> transported from the site by Shop Hazard Solutions, Inc of Turlock, California, for final disposal <br /> ' at a licenced treatment facility A copy of the transporter's manifest are included in Appendix B <br /> 30 FINDINGS <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation ofround water in each well ell w as calculated by subtracting the ground water <br /> depth from the surveyed relative casing elevation (Table 1) The ground water elevation decreased <br /> approximately 0 7 feet between April and September 1997 The ground water flow direction at the <br /> site was generally radially to«and the northern portion of the property from all directions, towards <br /> ' the parking area of the site (Figure 3) <br /> I32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples from wells MW-I, MW-3, MW-4 and MW-5 at <br /> ' concentrations of 6,800 parts per billion (ppb, reported as micrograms per liter), 9,200 ppb, 70,000 <br /> ppb and 720 ppb respectively Benzene was detected in wells MW-1, MW-3 and MW-4 at <br /> ,concentrations of 100 ppb, 140 ppb and 9,700 ppb, respectively Benzene was not detected in wells <br />