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Table 4 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Station 11548 <br /> 1612 West Hammer Lane <br /> Stockton,California <br /> Nates: m <br /> =not mea.ured or analyzed <br /> <=below_letectic r limits used by laborer <br /> pglL=micrograms per liter <br /> bgs=below ground surface <br /> DO=dissolved oxygen <br /> mg/L=millicrams per liter <br /> MRL=method reporting limit <br /> msl=mean sea level <br /> MtBE=methyl tert-but ether <br /> MW=monitoring well <br /> NA=not analyzed <br /> P1NP=purgedinot purged I <br /> TOC=top of casin <br /> TPHd=total petroleum hydrocarbons as diesel(reported as diesel rangeanics(DRO)(C10-C36 as of 4!1!2004)in the analytical report) <br /> TPHg=total petroleum hydrocarbons as gasoline(reported as gasoline range organics(IRO)(C4-C12 as of 411!2004)in the analytical report) <br /> U.S.EPA=United States Environmental Protection Agency <br /> VW=vapor <br /> well <br /> Sample designations: <br /> 34 =discrete sample depth(feet. <br /> FP=free product. 5= sheen. O=obvious product odor. <br /> =Raised MRL because of matrix interference. <br /> "=The sample contains a lower boiling point hydrocarbon mixture quantified as gasoline;the chromatogram does not match the tvDicall asoline fingerprint, <br /> =Raised MRL because of high analyte_concentration re uq iring sample dilution. <br /> 2 MtBE was anal ed using U.S.EPA Method 8260B. <br /> [3]Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. <br /> [41 The sample was diluted because of the presence of high levels of target analytes resulting in elevated reporting limits. <br /> (51 The sample was diluted because of the presence of_high levels of non-target analytes resulting in elevated re o ng limits. <br /> 3/1112004-VW-5S and VW-5D data rejected because of a discrepancy dune sam lin . <br /> Data Qualifier Definitions: <br /> U=The analyte was analyzed for,but was not detected above the sample reporting limit. <br /> J=The analyte was positively identified;the associated numerical value is the approximate concentration of the analyte in the sample. <br /> N=The analysis indicates the presence of an analyte for which there is presumptive evidence to make a tentative identification. <br /> NJ=The analysis indicates the presence of an analyte that has been tentatively identified,and the associated numerical value represents its approximate concentration. <br /> 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 <br /> quantitation necessary to accurately and precisely measure the analytein the sam le. <br /> R=The sample results are refected because of identification or other ana�ical issues. <br /> ND=Not detected above reported detection limit. I <br /> 1:5BP-ARCO104 BP Valley Portfolio1548\Tab1es106-011548 Table 1-2-3-4 Page 14 of 14 5/31/2006 <br />