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i <br /> 1 � <br /> I <br /> it <br /> t <br /> 15 April 1996 <br /> • AGE-NC Project No 95-0109 <br /> Page 4 of 7 <br /> 3 3 1 MONITORING WELL PURGE PROCEDURES <br /> _ On,18 March j996, a Sohnst water level meter was used to measure the depth to ground water in ti <br /> each morirtornng well, prior,to purging (Table 5) A minimum of three well volumes of water were <br /> then removed from each well J <br />' Monitoring well EW-1 was purged using a 2-inch submersible pump Monitoring wells MW-6 <br /> through MW-14 were purged using clean PVC bailers Temperature, pH'and conductivity of the <br /> purge water were measured at approximately 1-gallon intervals (10-gallon intervals for EW=1) using <br /> an ICM water analyzer Dissolved oxygen was measured in each well during purging Monitoring well <br /> stabilization data and field sheets are included in Appendix A The purge water was placed in DOT- n <br /> approved drums and`stored on-site <br /> 3 3 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using disposable plastic bailers Immediately <br /> upon retrieval, the samples were transferred into 40-m1 EPA vials and transported in a chilled <br /> container to MAI Samples were analyzed for TPH-g and BTE&X in accordance with EPA methods <br /> 5030/8015m, and 602, respectively Samples from MW-7, MW-8, MW-9, MW-13, MW-14 and EW- <br /> 1 were also analyzed for volatile halocarbons in accordance with EPA method 601 The sample from <br /> MW-14 was also analyzed for ethylene dibromide (EDB) in accordance with EPA method 601 <br /> , L <br /> 4.0. FINDINGS <br /> 4 1 MICROBIOLOGICAL ACTIVITY IN GROUND WATER <br /> Microbiological{plate counts from ground water samples collectedr duringlhe first quarter' of 1996 ^ f <br /> showed ari increase in each well during the February sampling, However, a decrease was noted in <br /> 9 of 10 wells during the March sampling Nutrient concentrations generally decreased during the <br /> February monitoring and increased during the March,monitoring Concentrations of nitrogen showed <br /> a general increase Microbiological data for ground water is summarized on Table 1 and Table 2 The <br /> laboratory reports (A Keith Kaufman - March 12, 1996 and March 26 1996) and chain-of-custody _ <br /> forms are included in Appendix B <br /> i42 SOIL VAPOR SAMPLING <br /> Concentrations of organic vapors (OV) measured in the wells decreased during the first quarter of <br /> 1996 In each well; carbon dioxide readings are negatively correlated with oxygen concentrations <br /> ' r <br /> r <br />