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Table 1 Groundwater Elevations and Sample Analytical Results Former E-Z Serve Location No 100966 2537 Waterloo Road, Stockton,California Well No Sampling TQC DTW GWE' PSH TPHg B T E X MTBE ' (screenedint[rva)) Date (feet) (feet) (feet) 2 -- _2 _ - /L) /l /L VW-I 6/20/97 2059 _ (69'-79') 11/19/97 2059 5786 -3727 000 72,000 28,000 5,200 800 5,000 <5 0 ' 6/7101 2059 48 11 -2752 000 8,100 3,700 75 140 250 <250 11/6/012 2059 55 I7 -3458 000 10,000 3,800 87 130 410 <1,000 1129/02 2059 5146 -3087 000 1,100 700 74 270 286 54 5/31/02 2059 5166 -31 07 000 5,000 6,800 52 180 1,330 200 ' 8/20/02 2059 5756 -3697 000 7,200 4,900 89 230 650 280 11/20/02 2059 58 11 -3752 000 16,000 8,300 <100 280 1,000 430 1/16/03 2059 5523 -3464 000 28,000 8,800 850 150 2,200 250 4/16/03 2059 5330 -3271 000 <50 <0 50 <0 5 <0 5 <1 0 <2 0 ' 7/16/03 2059 -- -- -- -- -- -- __ -- -- 10/27/03 2059 -- -- -- VW-2 6/20/97 2085 5250 -31 65 000 -- -- -- -- 11/19/97 2085 5827 -3742 000 70,000 27,000 100 700 3,300 < 6/7/01 2085 4859 -2774 000 570 71 1 5 28 57 11/6/012 2085 5565 -3480 000 1,100 35 1 8 22 32 87 ' 1/29/02 2085 51 83 -3098 000 <500 14 24 46 13 1 75 5/31/02 2085 5200 -31 15 000 <500 11 081 054 14 100 8/20/02 2085 5802 -37 17 000 360 22 26 33 41 94 11/20/02 2085 5846 -3761 000 530 33 <0 5 <0 5 1 3 160 ' 1/16/03 2085 55 59 -34.74 000 310 I 7 <0 5 <0 5 <0 5 130 4/16103 2085 5289 -3204 000 8,600 2,900 35 62 450 210 7/16/03 2085 -- -- -- -- -- -- 10/27/03 2085 -- -- -- -- _- __ __ -. __ MVW-3 11/19/97 21 02 58 13 -37 11 000 110 22 15 < 41 91 (55'-651) 6/7/01 21 02 4848 -2746 000 71 <0 5 072 <0 5 <0 5 <5 11/6/012 21 02 5553 -3451 000 72 <0 30 <0 30 <0 30 <0 60 <10 1/29/02 2102 5191 -3089 000 <500 <0 5 <0 5 <0 5 5/31/02 2102 52 10 -3108 000 <500 <0 50 <0 50 <0 50 <1 5 37 8/20/02 2102 5908 -3706 000 <50 16 24 <0 50 1 7 37 11/20/02 2102 5849 -3747 000 63 <0 5 <0 5 <0 5 <0 5 36 1/16/03 21 02 5564 -3462 000 140 77 32 14 9 1 48 4/16/03 2102 5324 -3222 000 580 <0 5 <0 5 06 1 5 180 7/16103 2102 -- -- -- -- -- -- -- -- -- 10/27/03 2102 ' Notes Latest analytical results above their respective laboratory detection limits are in boldface font No known groundwater monitoring or sampling was conducted between December 9,1994 and September 17,1996,and November 19, 1997 and ' November 6,2001 TOC =Top of casing referenced to City of Stockton Benchmark No 63 [elevation=20 87 feet above mean sea level] DTW =Depth to water measured from top of casing GWE =Groundwater elevation as referenced to benchmark in feet above mean sea level PSH =Phase Separate Hydrocarbon thickness TPHg =Total Petroleum Hydrocarbons as gasoline(EPA Method 8015 or 8015B) B =Benzene(EPA Method 602 or 8020 or 8021B) T =Toluene(EPA Method 602 or 8020 or 8021B) ' E =Ethylbenzene(EPA Method 602 or 8020 or 8021B) X =Total Xylenes(EPA Method 602 or 8020 or 8021 B) MTBE=Methyl t-Butyl Ether(EPA Method 8020 or 8021) µg/l,=Micrograms per liter(--parts per billion) ' (70'-90') =Well screen interval(in feet below ground surface) <=Sample reported as"not detected,"in previous tables,reporting limit not known ` =If PSH present corrected GWE=TOC-Measured DTW+Corrected PSH Thickness(PSH Thickness x gas density[0 75 g/cc]) 2 =MTBE analysis performed by EPA Method 8260/8260B beginning on November 6,2001 s =Groundwater measurement data were collected on 10/27/03 Analytical data correspond to samples collected on 10/28/03 --=Not measured surveyed,sampled,or analyzed ' S 5E ZS8rve51009W Reports1EZ966(2003 Q4 GW Table) Page 6 of 6