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i Table 3 Groundwater Monitoring Results-BTEXITPH as Gasoline Analyses Del Monte Disco Property Stockton,California Concentration(uX4) Sample TPH Ethyl Well Date Gasoline Benzene Toluene benzene Xylenes Dilution Lead TCLP - 500 - - - 5,000 MCL l 1,000 680 1,750 50 NP-1-80' 12/29/94 NA r 3/12/95 NA 7/26195 NA 4117197 1.1000 NA 12/22/97 1:500a/1:1000b NA ' 4/16/98 1:1000 NA 8/7/98 1:1000 NA 11/11/98 I:40a/1:400b/1:2000c NA 2/11/99 1:200a/1:2000b NA NP-1-80 BB 12122/97 <50 <0.3 <0.3 <0.3 <0.3 NA NP-1-70' 3/12195 NA 7/26195 NA 8/15/96 1:500 NA 4117197 1:1000 NA 12/22/97 1:1000a/1:100b NA 4/16/98 1:1000 NA f 8/7/98 1:1000 NA 11/11/98 1:40a/1:2000b NA 2/11/99 1:200a/1:2000b NA NP-1-70 BB 12/22/97 <50 <0.3 <0.3 <0.3 <0.3 NA i NP-2-65' 8/15196 1:500 NA 4117/97 1:100 NA SVE-NORTH 4/17197 1:100 NA j 12/22/97 1:50a/1:100b NA i 4/16/98 1:2 NA 7/23198 1:10 NA 11/11/98 1:1 NA 2/11/99 I:Ia/1:100b NA f SVE-NBB 12/22/97 <50a <0.3a <0.3b <0.3a <0.3a 1.500a1L•1000b NA 4116198 <50 <0.3 <0.3 <0.3 <0.3 2:1 NA 2111199 <50 <0.31 <0.3 <0.3 <0.3 1:1 NA SVE-SOUTH 4/17/97 1:1000 NA 8/12198 NA 12/22/97 NA i 4/16/98 1:500 NA (I 7/23/98 1:200 NA 11/11/98 1:400a/1:2000b NA 2/11/99 1.2000 NA SVE-S BB 12/22/97 <50 <0.3 <0.3 <0.3 <0.3 NA �. 4/16198 <50 <0.3 <0.3 <0.3 <0.3 2:1 NA 2/11199 <50 <0.3 <0.3 <0.3 <0.3 1:1 NA TCLP: EPA Toxicity Characteristic Leachate Procedure for identifying Hazardous Waste MCL: California Maximum Contaminant Level for Drinking Water <0.5: Below Detection limit of 0.5 ug/l j t * Sample collected by minimum aeration technique [ Shading indicates results above the detection limit. NA: Not Analyzed Gdata2-99.As Pape 6 of 6 6(25gg s