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F Kennedy/Jenks/Chilton tight traffic-rated vault. A graphic representation of the well ' construction is provided on the boring log in Appendix C Cuttings generated during drilling were placed in certified D O.T drums ' approved for the temporary storage and transport of hazardous waste The drums were labeled with the well number, contents, and date. Monitoring well MW-5 was developed on 5 June 1990 to stabilize the ' artificial filter pack. Well development included surging with a vented two-inch surge block followed by pumping with a diastolic pump. ' Monitoring well MW-5, as well as the four previously installed wells (MW-1, MW-2, MW-3, and MW-4) were sampled on 5 June 1990. Prior to sampling, the wells were purged of the equivalent of three well casing volumes of water. The parameters pH, temperature, and conductivity were ' monitored during the purging process until the parameters stabilized. The wells were sampled using pre-cleaned Teflon bailers. The water generated during the purging process for each well was collected in D.O.T. approved drums pending the results of the analyses. The drums were labeled as to well number, contents, and date ' Laboratory Analyses Results Soil samples collected from the monitoring well (MW-5) boring were analyzed in the laboratory for total petroleum hydrocarbons by modified EPA Method 8015 and for BXT&E using EPA Method 8020 Groundwater samples collected from all of the monitoring wells (MW 1, MW 2, MW-3, MW-4, and MW-5) were also analyzed for TPH and BXT&E using the methods ' discussed above. Petroleum hydrocarbons as gasoline and diesel fuel were not detected in ' any of the soil samples analyzed Petroleum hydrocarbons as petroleum naptha were detected at a concentration of 0 11 mg/Kg in the sample collected from the 20.5- to 21 0-foot depth interval BXT&E also were not detected in the soil samples analyzed. The results of the analyses ' are provided in Table 2. Laboratory data sheets for the soil analyses are provided in Appendix A, Part 2. ' Petroleum hydrocarbons and BXT&E were not detected in the groundwater samples collected from monitoring wells MW-2, MW-3, MW-4 and MW-5. Petroleum hydrocarbons as gasoline and diesel fuel were detected in a sample collected from monitoring well MW-1 at concentrations of 2.1 mg/L ' and 9 7 mg/L, respectively The sample from monitoring well MW-1 also contained benzene and total xylenes at concentrations of 0 092 mg/L and 0 026 mg/L, respectively The results of the groundwater analyses are ' provided in Table 3, and the laboratory data sheets are provided in Appendix A, Part 2 Table 4 contains the groundwater elevations measured in the monitoring wells during the Preliminary and Phase II investigations. The approximate groundwater gradient beneath the site is shown on Figure 8 ' WPI13 2.5 882526.01