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+f <br /> Fourth Quarter,2002 Quarterly Groundwater Monitoring Report <br /> Canepa's Car Wash,Pacific Avenue,Stockton,CA <br /> Page 3 <br /> October 25, 2001. The MTBE concentration detected in groundwater sample collected from MW-3 is <br /> . lower than previously detected (Figure 6, Attachment A). <br /> Laboratory certificates of analyses and chain of custody record are included in Attachment E. <br /> Table 2 <br /> Groundwater Laboratory Analytical Results (October 14 and 15, 2002) <br /> Constituent: Benzene Toluene Ethyl Total TPH-G MTBE <br /> MCL 1 gg/L 150 4g/L Benzene Xylenes 13 pg/L. <br /> 700 pg/L <br /> Detection Limit: 0.5 0.5 0.5 1.0 0.05 0.5 <br /> Sample ID WL µg/L PP/- µg/L mg/L AWL <br /> 1707-MW-1-10/15/2002 110 52 39 64 0.45 140 <br /> 1707-MW-2-10/15/2002 20,000 970 2,600 4,800 69 <2,000 <br /> 1707-MW-3-10/15/2002 0.6 <0.5 <0.5 <1.0 <0.05 320 <br /> 1707-MW-4-10/15/2002 1.8 <0.5 <0.5 <1.0 .055 <5.0 <br /> 1707-MW-5-1011412002 <0.5 <0.5 <0.5 <1.0 <0.05 <5.0 <br /> 1707-MW-6-10/15/2002 <0.5 <0.5 <0.5 <1.0 <0.05 <5.0 <br /> 1707-MW-7-10/15/2002 <0.5 <0.5 <0.5 <1.0 <0.05 <5.0 <br /> 1707-MW-8-10/14/2002 <0.5 <0.5 <0.5 <1.0 <0.05 <5.0 <br /> 1707-MW-9-10/14/2002 <0.5 <0.5 <0.5 <1.0 <0.05 <5.0 <br /> 1707-MW-10-10/14/2002 0.6 <0.5 <0.5 <1.0 <0.05 <5.0 <br /> 1707-MW-11-10/15/2002 3.7 <0.5 0.7 <1.0 0.24 17 <br /> 1707-MW-12D-10/15/2002 1.3 0.5 1.2 <1.0 .055 <5.0 <br /> 1707-SV-4-10/15/2002 93,000 86,000 1 4,600 1 18,000 450 730,000 <br /> Unit Conversions: Analytical: <br /> pg/L:parts per billion(ppb) TPH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> mg/L:parts per million(ppm) MTBE=methyl-tertiary butyl ether <br /> *=Estimated value due to coelution of peaks and retention time variations. <br /> CORRECTION OF PREVIOUS REPORT <br /> Condor reported in the Third Quarter Groundwater Monitoring Report, dated August 19, 2002, that the <br /> laboratory analytical result for MTBE in the sample collected from SV-8 on July 2, 2002 was 5,500 pg/L. <br /> Upon review of the July 2, 2002 data submitted in Electronic Deliverable Format (EDF) to Condor by <br /> Excelchem, a discrepancy was noted in the original laboratory report for MTBE in the sample collected <br /> from SV-8. The EDF data indicated an MTBE concentration of 3,600 µg/L for the groundwater sample <br /> collected from SV-8. The EDF data for SV-8 was determined to be correct by Excelchem and a revised <br /> laboratory report was issued. A copy of the corrected laboratory certificate of analyses and chain-of- <br /> custody record for the July 1-3, 2002 monitoring event and a revised summary of Historical Groundwater <br /> Monitoring Data(Table A, Attachment C) are attached. <br /> • <br /> �.1� CONDOR <br />