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Taft, ! - Groundwater Monitoring Data ARCO Service Station No. 2130 7906 North EI Dorado Street, Stockton, California Page 6 of 6 Well Elevation Static Water Groundwater Total Number Date Top of CasinE Level Elevation TPHG Benzene Toluene Eth lbenzene Xylene Observations MW-10 11/29/93 1438 5930 4492 1,000 <11** <3** <1* 10 No FP MW-10 03/23/94 1438 5436 -3998 1,300 66 6 1 16 3 6 No FP MW-10 06/22/94 1438 5435 -39 97 1,600 5 0 15 3 3 5 5 No FP MW-10 09/28/94 1438 58 11 -43 67 NA NA NA NA NA No FP MW-10 09/29/94 --- --- --- 1,100 <0 5 <0 5 3 6 4 0 No FP MW-10 12/01/94 1438 57 15 -4277 800 <0 5 2 3 0 8 13 No FP MW-10 02/28/95 1438 5424 -3986 300 0 9 <0 5 <0 5 <0 5 No FP MW-10 05/19/95 1439 5232 -3794 370 0 9 <0 5 <0 5 <0 5 No FP MW-10 08/28/95 1438 5370 -3932 420 12 <0 5 <0 5 <0 5 No FP MW-10 12/07/95 1438 5261 -3823 490 07 <0 5 <0 5 <0 5 No FP MW-10 02/05/96 1438 50 13 -3575 350 07 <0 5 <0 5 <0 5 No FP TBLB 03/23/94 --- --- --- <10 <0 3 <0 3 <0 3 <0 5 NA TBLB 06/22/94 --- --- --- <10 <0 3 <0 3 <0 3 <0 5 NA TBLB 09/29/94 --- --- --- <50 <0 5 <0 5 <0 5 <0 5 NA TBLB 12/01/94 --- --- --- <50 <0 5 <0 5 <0 5 <0 5 NA TBLB 02/28/95 --- --- --- <50 <0 5 <0 5 <0 5 <0 5 NA Measurements in feet. Datum in mean sea level Static water level measured in feet below top of casing —=Well not surveyed <=Below detection luno for the analytic methods used *=Raised method reporting limit(MRL)due to high analyte concentration requiring sample dilution #* Raised MRL due to mainx mterference ***=The sample contains discrete non-fuel components eluting in the gasoline range,quantified as gasoline The chromatogtatn does not match the typical gasoline fingerprint �=Not sampled as well is scheduled to be abandoned TM=Trip Blank NE=Not evaluated FP=Free Product NA=Not Analyzed N\xls\080551140"30196DI xls Rev 2 6/17/96