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i <br /> air was "turned off' to the southern portion of the system and has been providing air only <br /> to MW-4, MW-5, MW-14, VW-4, VW-5 and VW-6 since February 1994 The layout of the <br /> blower piping is depicted in Figure 3 <br />' 2.5 Bioremediation Pilot Test <br /> On February 2, 1994, a total of five wells were inoculated with hydrocarbon-consuming <br />' bacteria by representatives of GeoAudit Wells MW-4, VW-1, VW-4, VW-5 and VW-6 were <br /> inoculated with 70 to 180 gallons of inoculum, depending upon well diameter and depth In <br /> accordance with an agreement with the CVRWQCB, the wells were chosen to prevent <br /> impact to water during the pilot test <br /> The pilot test was scheduled to last a period of two months, February and March 1994 Data <br />' and results for the first month of the Pilot Test (February) was reported in a "Monthly <br /> Monitoring Report" dated March 11, 1994 and submitted to the CVRWQCB Data and <br /> results for the second month of the Pilot Test were submitted to the CVRWQCB in a letter <br /> dated June 10, 1994 <br /> 3.0 PROCEDURES <br /> lie 3.1 Groundwater Monitoring <br /> Pursuant to the C & A order, a total of eight (8) monitoring wells were sampled on .Tune <br /> 21, 1994 Groundwater depths were measured in all wells and samples were collected from <br /> MW-6, MW-7, MW-10 through MW-14 and EW-1 Prior to sampling, the wells were purged <br /> of standing water <br /> I32 Monitoring Well Purge Procedures <br /> A Solinst water level meter was used to measure the groundwater depth in each monitoring <br /> well (Table 1) An attempt was then made to purge each well of a minimum of three well <br /> volumes All wells had sufficient water for purging except MW-6, less than two gallons were <br />' removed from MW-6 <br /> All wells except EW-1 were purged using PVC bailers Well EW-1 was purged using a 2" <br /> I submersible pump Temperature, pH and conductivity of the purge water were measured <br /> at approximately 1-gallon intervals (5-gallon intervals for EW-1) using a ICM water analyzer <br /> (Appendix A) The water was placed in labelled DOT-approved drums and stored on-site <br /> 3.3 Groundwater Sampling <br />' Water samples were collected from each well using clean, disposable plastic bailers The <br /> samples were collected in 40-m1 EPA vials, 1-liter amber bottles and plastic bottles Samples <br /> Geob&c+l Audit Scrvre. inc L <br /> 1 331�94RLD6 <br /> M QM4 <br />