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' QUARTERLY MONITORING REPORT JULY 1997 CANEPA S CAR WASH 62;0 Pacific Avenue Stockton CA August 14 1997 ' August, 1996, monitoring event Because of this August, 1996, background data, the presence of MTBE in groundwater samples collected during this monitoring event was not confirmed using EPA Method 8260 The laboratory certificates of analyses and chain-of-custody records are located in ' Appendix C ' 4.2 Resents of Analyses Gasoline was detected in the groundwater samples from MW-I at 7 9 mg/L, MW-2 at 86 mg/L, MW-4 at 0 10 mg/L, MW-6 at 0 06, and SV-3 at 280 mg/L BTEX constituents were detected in groundwater samples from MW-1, MW-2, MW-4, MW-5, MW-6, MW-7, and SV-3 ranging from 0 5 µg/L to 73,000 }Lg/L MTBE was detected in groundwater samples from MW-1 at 410 µg/L, MW-2 ' at 230 lig/L, MW-6 at 1 4 µg/L, and SV-3 at 35,000 4g/L TPH-G and BTEX constituents were not detected at or above the laboratory reported detection limit in the groundwater samples collected from MW-3 and MW-8 MTBE was not detected at or above the laboratory reported detection limit in groundwater samples collected from MW-4, MW-5, MW-7, or MW-8 The laboratory results are presented in Table 1, below, and Figure 2, Appendix A TABLE 1 Groundwater Analytical Results (July, 1997) MW-1 through MW-8, SV-3 B T E X MTBE TPH-G MONITOR Detection 03 03 03 06 1 0 005 WELL/S4IPLE DATE Limits µJ1 µJl µg/1 µg/1 µg/1 mg/l I Sample ID MW-1 7/18/97 1707-MW1-7118/97 3 900 1 800 340 l 100 410 79 MW-2 7/18/97 1707-MW2-7/18/97 37 000 7200 1 500 4 100 230 86 MW-3 7/18/97 1707-MW3-7/I8/97 ND ND ND ND 12 ND MW-4 7/17/97 1707-MW4-7/17/97 ND 32 ND ND ND 010 MW-5 7/17/97 1707-MW5-7/17/97 ND 06 ND ND ND ND MW-6 7/17/97 1707-MW6-7/17/97 ND l 0 1 2 ND 1 4 006 MW-7 7/17/97 1707-MW7-7/17/97 ND 05 37 1 2 ND ND MW-8 7/17/97 1707-MWS-7/17/97 ND ND ND ND ND ND ISV-3 7/18/97 1707-5V3-7/18197 71 000 71 000 l Wo 1 Q nnn ;s non �Rn Unit Conversions Analvtical µg/1 parts per billion(ppb) B T E,X =benzene toluene ethyl benzene, and xylene mg/l parts per million(ppm) TPH-G =total petroleum hydrocarbons quantified as gasoline MTBE =methyl tertiary butyl ether ND=none detected at or above laboraton reported detection limit Page -3- �� CONDOR