ARCHIVED REPORTS XR0009499 - Laserfiche WebLink

Home Browse Search

i ' AZURE ENVIRONMENTAL ' Water table elevation data collected at the Site indicate the shallow ground-water surface is generally flat (Figure 3) Previous data indicate the general direction of ground-water flow is toward the north, with local variations of flow direction in the area adjacent to the former tank- ' locations at the Site 3_2 Ground-Water Samohn2 and Laboratory Analysis ' On February 25, 1999, ground-water samples were collected from two downgradient monitoring wells (MW-9 and MW-10) The samples were analyzed for total petroleum hydrocarbons as ' gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX) compounds, and methyl tertiary-butyl ether (MTBE) Historical laboratory analysis results are summarized in Table 3, laboratory certificates are included in Appendix A and field sampling data sheets are included in ' Appendix B Most recent benzene monitoring data are illustrated in Figure 4 Monitoring data collected for wells MW-9 and MW-10 in February 1999 indicate petroleum ' hydrocarbons, including benzene(<0 5 ppb) and MTBE (<5 ppb), were not detected Historical data indicate benzene has not been detected at concentrations greater than 0 5 ppb in downgradient wells MW-9 since January 1995 (0 6 ppb) and MW-10 since October 1994 (0 6 ' ppb) These data continue to indicate the petroleum hydrocarbon plume has stabilized and is restricted to shallow ground water in the area adjacent to the former tank locations at the Site • 4.0 TECHNICAL STATUS REPORT Work Completed During the First Quarter 1999 Work completed during the first quarter included performance of the quarterly ground-water ' monitoring program Work Expected to be Completed During the Second Quarter 1999 Work expected to be completed during the second quarter includes continued performance of the quarterly ground-water monitoring program I 1 2