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i therefore, of great importance that the bacteriologist be quite familiar with the species to be identified Furthermore, exact species identification is quite difficult, economically Iburdensome and time consuming 4.3 Groundwater Monitoring IThe standard quarterly groundwater monitoring program (as outlined in the C & A order) will remain during the remediation project However, additional groundwater monitoringwill required to determine remediation progress Additional groundwater monitoring will consist of the collection of samples and analysis for ITPH as gasoline, BTE&X, dissolved oxygen and microbial species and numbers Field tests will monitor pH Monitoring wells MW-12, MW-14 and EW-1 will be monitored on a b1-monthly basis Each well will be purged, using a PVC bailer, of approximately 5 to 7 gallons of water, pH will be measured at one gallon intervals A sample will then be collected from each well and analyzed for TPH as gasoline, BTE&X and dissolved oxygen A sample will also be transmitted to a microbiologist for analysis of microbial species and numbers Additionally, MW-6, MW-10 and MW-13 should be sampled on a quarterly basis for microbial species and numbers It should be noted that because EW-1 has a well volume of approximately 20 gallons, it will not be purged of 3 to 5 well volumes prior to sampling (except during normal quarterly sampling) Samples from MW-12, as well as quarterly samples from MW-13, will provide data on down- gradient microbial movement Samples from MW-14 and EW-1 will provide data on hydrocarbon mitigation near the center of the plume Quarterly samples from MW-6 and MW-10 will provide data on up-gradient migration of the bacteria IThe standard quarterly groundwater monitoring program (C&A order) should be amended to include coliform testing on MW-S, MW-14 and EW-1 for the second quarter (pre- inoculation) and third quarter (post-inoculation) of 1994 Each of these wells is located near Cherokee Lane, where a City of Lodi sewer line is located Data from the pilot study indicated that coliform may have been present in MW-14 and EW-1 Samples from these Iwells should help determine if coliform is present as a result of the bioremediation project or other causes (sewer lines) IThe additional monitoring should continue for the first six months of the project After six months, the monitoring program will be re-evaluated and, if necessary, modified I I [7eobpal A.&Se +ea 1- 9 !331C7s+^bohuKt4 9