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1 ., �••a TABLE 1 Ground Water Elevation Monitoring Top of Riser Depth to Ground Water Well Date Elevation!@) Water(ft) Elevation(ft) MW-20 02/09/91 3078 5050 -1972 04/11/91 4956 -1878 06/19/91 5146 -2068 09/20/91 5362 22 84 12/3019l 5211 -2133 MW-34 02/09/91 3019 50 04 -1985 04/11/91 4919 -1900 06/19/91 5105 -2086 09/2.0191 5288 -2269 12/30/91 5156 21 37 MW-35 02/09/91 3138 5097 -1959 04111/91 5008 -1870 06/19/91 5196 -2058 09120/91 5380 -2242 12230/91 5277 21 39 MW-36 02/09/91 3060 5020 -1960 04/11/91 4932 -1872 06/19/91 51 12 -2052 09/20/91 5338 -2278 12/30/91 51 98 -2138 a Momtormg well MW-20 surveyed relative to mean sea level by DuPont Environmental Remediation Services Monitoring well MW-34, MW-35 and MW-36, surveyed by Delta relative to MW-20 TABLE 2 Ground Water Sample Analytical Results Parts per Bion (ppb) Monitoring Well Date Benzene Toluene Ethylbenzene Xylenes TPHa i MW-20 10104/90b 3 4 <05 <05 <05 99 02/08/91c --- --- --- --- 04/11/91 <0 5 1 5 <0 5 3 7 <50 06/19/91 <05 <05 <05 07 89 09/20/91 16 30 <05 68 500 12/30/91 <05 12 <05 47 130 MW-34 02/08/91 1 8 <0 5 <05 41 140 04/11/91 120 1 8 07 3 6 260 06/19/91 75 45 84 42 1,100 09/20/91 <05 30 12 62 580 12/30/91 <0 5 10 <0 5 23 270 MW-35 02/08/91 1 8 1 6 10 11 98 04/11/91 14 120 26 41 280 06/19/91 2 3 13 48 54 700 09/20/91 3 0 16 60 840 5,700 12/30/91 <05 <05 <05 <05 <50 MW-36 02/08/91 <0 5 <05 <05 <05 <50 04/11/91 <0 5 20 <05 3 1 <50 06/19/91 <05 <05 <05 <05 <50 09/20/91 <05 12 <05 <05 <50 12/30/91 <0 5 06 <05 <05 <50 a Total Petroleum Hydrocarbons detected as gasoline b From DuPont Environmental Remediation Services, Fourth Quarter 1990 Quarterly Monitoring . Report c Not Sampled