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Table 1 Groundwater Elevation and Analytical Data Former BP Service Station No 11191 1469 E Hammer Lane, Stockton CA i TOC Depth to Water Level Ethyl- Total Well Date P! Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg1L) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (pg1L) (mg/L) Comments MW-4 01/30/2003 P 2434 4977 -2543 <50,000 <500 UJ <500 UJ <500 UJ <500 UJ 14,000*J -- 04/10/2003 P 2434 4820 -2386 8,600 - <50 <50 <50 <50 17,000- -- 07/11/2003 P 2434 51 62 -2728 910 -- <50 <50 <50 <50 2 200' 20 10/17/2003 P 24 34 5632 -3198 15,000 R — <500 <500 <500 <500 37,000" -- 01/26/2004 P 2434 51 89 -2755 6,200 -- <250 <250 <250 <250 22,000- MW-5 04!90/2003 P 2291 4661 -2370 900 -- <5 0 <50 <5 0 <5 0 1900* -- 07/11/2003 P 2291 5043 -2752 1,100 R — <50 <50 <50 <50 3,000" 21 10/17/2003 P 2291 5490 -3199 1,600 R -- <50 <50 <50 <50 3,600` — 01/26/2004 P 2291 5038 -2747 1,300 -- <100 <100 <100 <100 4,300' MW-6 04/10/2003 P 2207 4595 -2388 <50 — <0 50 <0 50 <0 50 <0 50 <25 -- 07/11/2003 P 2207 4965 -2758 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 34 10/17/2003 P 2207 5427 -3220 <50 - <0 50 <0 50 <0 50 <0 50 <0 50* — 01/26/2004 P 2207 4974 -2767 75 — <0 50 <0 50 <0 50 <0 50 <0 50* MW-7 04/10/2003 P 2243 4630 -2387 <50 — <0 50 <0 50 <0 50 <0 50 <2 5 -- 07/11/2003 P 2243 4960 -2717 <50 — <0 50 <0 50 <0 50 <0 50 <0 50* 39 10/17/2003 P 2243 5485 -3242 <50 - <0 50 <0 50 <0 50 <0 50 <0 50* — 01/26/2004 P 2243 5013 1 -2770 1 <50 -- <0 50 <0 50 <0 50 <0 50 <0 50' -- TPHg=Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics in analytical report) TPHd=Total petroleum hydrocarbons as diesel(reported as DRO-diesel range organics in the analytical report) MtBE=Methyl tert-butyl ether DO=Dissolved oxygen bgs=below ground surface msl=mean sea level pg/L=micrograms per liter mg/L=milligrams per liter P/NP=purged/not purged <=below given laboratory detection limits --=not measured or analyzed *=analyzed by EPA Method 8260B Wells were resurveyed on March 21,2003 by Morrow Surveying 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 UJ=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 Report Date April 30,2004 Page 2 of 3