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15 April 1996 <br /> AGE-NC Project No 95-0109 <br /> Page 3'of 7 <br /> All samples were collected using disposable°plastic bailers or pre-cleaned PVC bailers and�were <br /> monitored in the field for dissolved oxygen, pH and electrical conductivity (EC) Following the <br /> w _ _ procedures described in Section 3 3 ,_samples for microbiological evaluation were collected in 40-m1 t w <br /> VOA vials with no added preservative, and were transported to A Keith Kaufman, M S in Culver, <br /> City, California _The samples were analyzed for physicochemical properties and microbiological <br /> enumeration Table I and Table 2 summarize the results of these activities through March 1996 <br /> r <br /> 3 2 SOIL VAPOR MONITORING <br /> Seven remediation wells (VW-1 through VW-7), three monitoring wells (MW-3 through MW-5) <br /> which are presently dry, and MW-14 are connected to.a low-pressure blower that provides oxygen ` <br /> in air-to the subsurface The blower is commonly turned off during wet weather, due to flooding at <br /> the site <br /> Oxygen, carbon dioxide 'and organic vapors were measured once each month using field <br /> instrumentation The percentage of oxygen and carbon dioxide in soil gas recovered from the vadose <br /> zone was measured using a GasTech OJCOZ analyzer Organic vapor concentrations were measured <br /> in parts per million using a PID <br /> IAir samples were collected from each monitoring point after the -well had been purged for <br /> approximately three to five nunutes, using an electric air pump Air was then drawn through the field <br /> instrument and the measurement was recorded after stabilization The results of the vapor monitoring <br /> are included in Table 3 <br /> r Y <br /> On 26 March 1996, air samples were collected from MW-3, MW-4 and MW-14 Samples were <br /> collected in Tedlar bags after field measurements using an electric air pump The samples were r <br /> transported under chain-of-custody to FGL Labbratones in Stockton and from there to their associate <br /> office'in'Santa Paula for analysis for methane and nitrogen <br /> 4 <br /> 3 3 MONITORING OF GROUND WATER'FOR PETROLEUM HYDROCARBONS <br /> On'a more frequent monitoring schedule requirement, wells MW-14 and EW-1 were sampled, but <br />' not purged, on 29 February I996 On 18 March 1996, regular quarterly monitoring procedures were <br /> performed at the site, which also included MW-14 and EW-I As during past monitoring events, wells <br /> MW-1 through MW-5 did not contain enough water for sampling <br /> r <br /> , <br /> 4 <br />