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Table 1 Groundwater Elevation and Analytical Data ARCO Service Station No,5450 1617 West Fremont Street,Stockton,California Well Depth Groundwater Groundwater Ethyl- Xylenes Well Date P/NP Elevation to Water Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE' DO Number Sampled ft,MSL ft,TOC ft,MSL) Change ft 41WI- ) ) ) fl- (mg/LL- MW-2 9/11/2002 P 8.67 11.37 -2.70 -- 98 <0.5 <0.5 <0.5 <0.5 62 -- 11/27/2002 P 10.90 -2.23 0.47 <50 <0.5 <0.5 4.5 <0.5 43 2.2 3/14/2003 P 10.60 -1.93 0.30 <50 <0.5 <0.5 <0.5 <0.5 28 5.2 4/24/2003 P 10.72 -2.05 -0.12 <50 <0,5 <0.5 <0.5 <0.5 30 2.4 8/14/2003 P 11.30 -2.63 -0.58 <50 <0.5 <0.5 <0.5 4.5 18 2.3 MW-3 9/11/2002 P 8.77 11.35 -2.58 <50 <0.5 <0.5 <0.5 <0.5 0.77 -- 11/2712002 - 1112712002 P 11.17 -2.40 0.18 40 <0.5 <0.5 <0.5 <0.5 <0.5 1.8 3/14/2003 P 10.48 1.71 0.69 <50 <0.5 <0.5 <0.5 <0.5 <0.5 0.5 412412003 P 10.50 -1.73 -0.02 <50 <0.5 <0.5 <0.5 <0.5 <0.5 2.8 8/14/2003 P 11.23 -2.46 -0.73 <50 <0.5 <0.5 <0.5 <0.5 <0.5 2.1 MW-4 9/11/2002 P 8.66 11.34 -2.68 <50 <0.5 <0.5 <0.5 <0.5 <0.5 -- 11/27/2002 - 11/2712002 P 11.19 -2.53 0.15 <50 <0.5 <0.5 <0.5 <0.5 <0.5 1.1 3/14/2003 P 10.60 -1.94 0.59 <SG <0.5 <0.5 <0.5 <0.5 0.69 1.5 4124/2003 P 10.77 -2.11 -0.17 <50 <0.5 <0.5 <0.5 <0.5 0.66 2.7 8114/2003 P 11.28 -2.62 -0.51 <50 <0.5 <0.5 <0.5. <0.5 1.5 2.6 Notes: < = below given laboratory detection limit MtBE - Methyl tert-butyl ether not measured or calculated PMP = purged/not purged = analyzed using EPA Method 8260 TPHg = Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics) DO = Dissolved oxygen TOC = top of casing ft = feet Ng1L = micrograms per liter mg1L = milligrams per liter t✓ Data Qualifier Definitions: U The analyte was analyzed for,but was not detected above the sample reporting limit. J The analyte was positively Identified;the associated numerical value Is the approximate concentration of the analyte in the sample. N The analysis indicates the presence of an analyte for which there is presumptive evidence to make a"tentative identification." NJ The analysis indicates the presence of an analyte that has been"tentatively Identified"and the associated numerical value represents its approximate concentration. LIJ The analyte was not detected above the reported sample reporting limit. However,the reported reporting limit is approximate and may or may not represent the actual limit of quantitation necessary to accurately and precisely measure the anatyte in the sample. R The sample results are rejected due to serious deficiencies in the ability to analyze the sample (i.e.,the presence or absence of the analyte cannot be verified)or the analyte identification has been rejected(i.e.,the presence of the analyte cannot be verified). ND Not detected above reported detection limit 1 of 1 K.SW PMUSSU5 SP ARC050545ZOuaMeilyl3 OTR 0355450 GWMR 3003