ARCHIVED REPORTS_GROUNDWATER MONITORING AND REMEDIATION REPORT - 3RD AND 4TH QUARTERS 2010

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WELL CONCENTRATIONS Equilon Enterprises LLC Distribution Terminal 3515 Navy Drive Stockton,CA MTBE MTBE Depth to Depth to GW SPH DO Well ID Date TPPH TEPH B T E X 6020 6260 DIPE ETBE TAME TBA Ethanol Methanol Leatl 70C Water SPH Elevation Thickness Reading u ti u /L u /L u 2 (u /L u /L u /L u /L u /L u IL u /L u /L u /L u /L (m /L (MSL (ft. ft. MSL (ft. m Notes: a=Depth to liquid/Liquid surface elevation. b=Separate-phase hydrocarbons were present in well following purge. c=Top of casing broken. d=Chromatogram pattern indicated an unidentified hydrocarbon/Hydrocamon does not match pattern of laboratory's standard. e=Samples broken in transit to lab. f=Well MW-16 grab-sampled due to inoperable extraction pump which could not be removed from well. g=Analysis resulted in a value above the calibration range of the instrument value is an estimate. h=MW-1 1 wellhead rebuilt in April,2003;elevation data provided by The RETEC Group. i=Top of casing elevation adjusted during wellhead maintenance. j=Samples were analyzed outside of the method holding time for Volatile Organics and Gasoline Range Organic. k=Reporting limits were increased due to high concentrations of target analytes. I=Hydrocarbon reported is in the early Diesel range and does not match the laboratory's Diesel standard. m=Extracted out of holding time. n=Analyzed out of holding time o=Estimated value. The concentration exceeded the calibration of analysis. p The concentration reported reflects)individual or discrete unidentified peaks not matching a typical fuel pattern. q=The sample chromatographic pattern for TPH does not match the chromatographic pattern of the specified standard. Quantitation of the unknown hydrocarbon(s)in the sample was based upon the specified standard. r=Analyte was detected at a concentration below the reporting limit and above the laboratory method detection limit. Reported value is estimated. s=Sample was originally analyzed within the EPA recommended hold time. Re-analysis for dilution was performed past the recommended hold time. t=There was insufficient preservative to reduce the sample pH to less than 2. The sample was analyzed within 14 days of sampling but beyond the 7 days recommended for Benzene,Toluene,and Emylbenzene. u=The result was reported with a possible high bias due to the continuing calibration verification falling outside the acceptance criteria. v=The reporting limit for this analyte has been raised to account for matrix interference. w=Elevated Reporting Limits due M limited sample volume. x=Sample was diluted due to the presence of high levels of non-target analytes resulting in elevated reporting limits. y=Estimated value.Anayte detected at a level less than the Reporting Limit(RL)and greater than or equal to the Method Detection Limit(MDL).The user of this data should be aware that this data is of limited reliability. z=Due to low levels of analyte found in the sample,the analyte was qualitatively identified based on the compound's retention time and the presence of a single mass ion. as=Hydrocarbon result partly due to individual peak(s)in quantitation range. bb=Extractable Hydrocarbons with Slice Gel cleanup by EPA 80158 cc=Reporting limit raised due to insufficient sample volume. dd=Reporting limit raised due to high concentrations of non-target analytes. ee=Analyzed by EPA Method 80158(M). ff=Analyte was present in the associated method blank. gg=Analyzed by EPA Method 60108 hh=The sample chromatographic pattern for TPH matches the chromatographic pattern of the specified standard but lighter hydrocarbons are also present(or were detected) _ Ethanol and Methanol analyzed by EPA Method 82608. Data from 1992 to 1993 supplied by Harding Lawson Associates_ CONTINUED ON NEXT PAGE Page 70