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J • Ta�Te 1 • Groundwater Elevation and Analytical Data BP Oil Site No 11191 1469 West Hammer Lane, Stockton, CA WELL DATE OF P/NP CASING DEPTH TO PRODUCT GROUNDWATER GROUNDWATER TPHg B T E X MtBE DO ID SAMPLING/ ELEVATION WATER THICKNESS ELEVATION ELEVATION WglL) M/L) (wg/L) WWI-) (pg1L) (pglL) (mg/L) MONITORING (Feet) (Fest) (Feet) (Feet) CHANGE (Feet) W 6 4/10/2003(a) P 22 07 4595 2388 <50 <0 5 <0 5 <0 5 <0 5 <2 5 -- 711112003 - 711112003 P 2207 4965 -2758 370 <50 <0 5 <0 5 <0 5 <0 5 <0 5 34 10/17/2003 P 2207 5427 --- -3220 -462 <50 <0 5 <0 5 <0 5 <0 5 <0 5 -- MW-7 -4/1012003 a 22 43(b) 4630 2387 --- <50 <0 5 <0 5 <0 5 <0 5 <2 5 -- 7/11/2003 P 2243 4960 2717 -330 <50 <0 5 <0 5 <0 5 <0 5 <0 5 39 10/17/2003 P 2243 5485 --- -3242 -525 <50 <05 <05 <0 5 <0 5 <05 -- ABBREVIATIONS --- = Not analyzedlapplecablelmeasurable (a) = TPHg and BTEX analyzed by 80156/8021 B,MtBE reported as 8260B mg1L = Milligrams per liter (b) = The wells were surveyed on March 21,2003 by Marrow Surveying MTBE = Methyl tert butyl ether B = Benzene by 8260 NP = Well was not purged prior to sampling T = Toluene by 8260 P = Well was purged of three casing volumes prior to sampling E = Ethylbenzene by 8260 TPHg = Total petroleum hydrocarbons as gasoline(reported as ORO) X = Total xylenes by 8260 ug/L = Micrograms per liter DO = Dissolved oxygen 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 necessary to accurately and precisely measure the analyte in the sample R The sample results are rejected due to identification or other analytical issues ND Not detected above reported detection limit k V5 BP AR00111191 1Quarterlyl l QTR 03/11191 GWMR 4Q03 Page 2 of 2